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  • JAVA导出EXCEL实现

    万次阅读 多人点赞 2019-07-31 18:39:28
    JAVA导出EXCEL实现

    ##JAVA导出EXCEL实现的多种方式
    java导出Excel的方法有多种,最为常用的方式就是使用第三方jar包,目前POI和JXL是最常用的二方包了,也推荐使用这两种。
    ###POI实现
    POI这里不详细解释,可参考徐老师发的博客:http://blog.csdn.net/evangel_z/article/details/7332535,他利用开源组件POI3.0.2动态导出EXCEL文档的通用处理类ExportExcel,详细使用方法下载最新代码看看就可以里,徐老师写的很明了!总之思路就是用Servlet接受post、get请求,获取文件导出路径,然后将测试数据封装好调用通用处理类导出Excel,然后再下载刚导出的Excel,会自动在浏览器弹出选择保存路径的弹出框,这样就达到里大家常见的文件导出下载的功能!当然,真正的项目里不可能把文件导出到本地,肯定是先吧文件导出到服务器上,再去服务器下载,对于用户来说就感觉好像直接就导出了!
    这种实现逻辑也可以修改,就是把通用处理类ExportExcel从void改为返回read好数据的InputStream,而不要直接就去write,然后调用下载的方法downLoad使用HttpServletResponse.getOutputStream()所得到的输出流来write数据,然后调用flush()时就会在页面弹出选择路径的弹出框,选择好后数据就真正从缓存输出到了Excel中,这样就省去里中间先要导出一次的步骤了。
    ###JXL实现
    我这里讲一下JXL,其实和POI差不多,就是调用的组件不同,引入的jar包不同了,整个Excel导出下载的逻辑还是一样的。好了,直接上代码,都是通用代码,以后都能用的上。
    先是几个mode类封装了在处理过程中会用到的模型。
    ExcelColMode 主要封装的是Map中的key或者dto中实现get方法的字段名,其实就是表格的标题的属性名。

    public class ExcelColMode {
    
    	/**
    	 * Map中的key或者dto中实现get方法的字段名
    	 */
    	private String name;
    
    	/** 列宽 */
    	private Integer width;
    
    	/**
    	 * 字体格式,可以设置字体大小,字体颜色,字体加粗
    	 */
    	private ExcelFontFormat fontFormat;
    
    	/**
    	 * 内容格式化
    	 */
    	private ExcelColModelFormatterInter contentFormatter;
    
    	public ExcelColMode(String name) {
    		this.name = name;
    	}
    
    	public ExcelColMode(String name, Integer width) {
    		this.name = name;
    		this.width = width;
    	}
    
    	public String getName() {
    		return name;
    	}
    
    	public void setName(String name) {
    		this.name = name;
    	}
    
    	public ExcelFontFormat getFontFormat() {
    		return fontFormat;
    	}
    
    	public void setFontFormat(ExcelFontFormat fontFormat) {
    		this.fontFormat = fontFormat;
    	}
    
    	public ExcelColModelFormatterInter getContentFormatter() {
    		return contentFormatter;
    	}
    
    	public void setContentFormatter(ExcelColModelFormatterInter contentFormatter) {
    		this.contentFormatter = contentFormatter
    	}
    
    	public Integer getWidth() {
    		return width;
    	}
    
    	public void setWidth(Integer width) {
    		this.width = width;
    	}
    
    }
    

    ExcelHeadCell 主要封装的是标题名

    public class ExcelHeadCell implements Comparable<ExcelHeadCell> {
    
    	/**
    	 * 列合并
    	 */
    	private int colSpan;
    
    	/**
    	 * 展现字符内容
    	 */
    	private String content;
    
    	/**
    	 * 父列的序列号
    	 */
    	private int fatherIndex;
    
    	/**
    	 * 字体格式等
    	 */
    	private ExcelFontFormat fontFormat;
    
    	private Integer height;
    
    	/**
    	 * 最基础的单元格,没有行合并和列合并
    	 * 
    	 * @param content
    	 */
    	public ExcelHeadCell(String content) {
    		this.colSpan = 1;
    		this.content = content;
    	}
    
    	public ExcelHeadCell(String content, Integer height) {
    		this.colSpan = 1;
    		this.content = content;
    		this.height = height;
    	}
    
    	public ExcelHeadCell(String content, int fatherIndex, ExcelFontFormat fontFormat) {
    		this.colSpan = 1;
    		this.content = content;
    		this.fatherIndex = fatherIndex;
    		this.fontFormat = fontFormat;
    	}
    
    	public int getColSpan() {
    		return colSpan;
    	}
    
    	public void setColSpan(int colSpan) {
    		this.colSpan = colSpan;
    	}
    
    	public String getContent() {
            return content;
    	}
    
    	public void setContent(String content) {
    		this.content = content;
    	}
    
    	public ExcelFontFormat getFontFormat() {
    		return fontFormat;
    	}
    
    	public void setFontFormat(ExcelFontFormat fontFormat) {
    		this.fontFormat = fontFormat;
    	}
    
    	public int getFatherIndex() {
    		return fatherIndex;
    	}
    
    	public void setFatherIndex(int fatherIndex) {
    		this.fatherIndex = fatherIndex;
    	}
    
    	public Integer getHeight() {
    		return height;
    	}
    
    	public void setHeight(Integer height) {
    		this.height = height;
    	}
    
    	public int compareTo(ExcelHeadCell o) {
    		int i = -1;
    		if (o == null) {
    			i = 1;
    		} else {
    			i = o.fatherIndex > this.fatherIndex ? -1 : 1;
    			if (o.fatherIndex == this.fatherIndex) {
    				i = 0;
    			}
    		}
    		return i;
    	}
    }
    

    ExcelExportRule 主要封装的是之前的ExcelColMode和ExcelHeadCell以及sheet页名称sheetName

    public class ExcelExportRule {
    
    	/**
    	 * 封装如何从数据集取数据,数据显示格式,日期格式和数字格式在这里设置
    	 */
    	private List<ExcelColMode> colModes;
    
    	/**
    	 * 封装EXCEL头部内容及内容显示格式
    	 */
    	private List<List<ExcelHeadCell>> headCols;
    
    	/**
    	 * 数据背景颜色区分,0:不区分,1:按行奇偶区分,奇数行白色,偶数行灰色,2:按列奇偶区分 奇数列白色,偶数列灰色, <br/>
    	 * <b>注意:此参数为0时,单元格设置的背景色才起作用</b>
    	 */
    	private int distinguishable = 0;
    
    	/**
    	 * EXCEL的sheet页名称
    	 */
    	private String sheetName;
    
    	/**
    	 * 是否树形结构,1:是,0:否
    	 */
    	private String hierarchical = "0";
    
    	/**
    	 * id字段名,当hierarchical="1"时候才起作用
    	 */
    	private String idName;
    
    	/**
    	 * 父id字段名,当hierarchical="1"时候才起作用
    	 */
    	private String pidName;
    
    	public List<ExcelColMode> getColModes() {
    		return colModes;
    	}
    
    	public void setColModes(List<ExcelColMode> colModes) {
    		this.colModes = colModes;
    	}
    
    	public List<List<ExcelHeadCell>> getHeadCols() {
    		return headCols;
    	}
    
    	public void setHeadCols(List<List<ExcelHeadCell>> headCols) {
    		this.headCols = headCols;
    	}
    
    	public int getDistinguishable() {
    		return distinguishable;
    	}
    
    	public void setDistinguishable(int distinguishable) {
    		this.distinguishable = distinguishable;
    	}
    
    	public String getSheetName() {
    		return sheetName;
    	}
    
    	public void setSheetName(String sheetName) {
    		this.sheetName = sheetName;
    	}
    
    	public String getHierarchical() {
    		return hierarchical;
    	}
    
    	public void setHierarchical(String hierarchical) {
    		this.hierarchical = hierarchical;
    	}
    
    	public String getIdName() {
    		return idName;
    	}
    
    	public void setIdName(String idName) {
    		this.idName = idName;
    	}
    
    	public String getPidName() {
    		return pidName;
    	}
    
    	public void setPidName(String pidName) {
    		this.pidName = pidName;
    	}
    
    	public void addExcelColMode(ExcelColMode excelColMode) {
    		if (colModes == null)
    			colModes = new ArrayList<ExcelColMode>();
    		colModes.add(excelColMode);
    	}
    
    	public void addExcelHeadCellList(List<ExcelHeadCell> list) {
    		if (headCols == null)
    			headCols = new ArrayList<List<ExcelHeadCell>>();
    		headCols.add(list);
    	}
    
    }
    

    ExcelFontFormat 封装的是表格的一些样式,如果对此没什么要求可以忽略

    public class ExcelFontFormat {
    
    	private int font = 0; // 字体 0:宋体,1:楷体,2:黑体,3:仿宋体,4:隶书
    	private Colour color = Colour.BLACK; // 字体颜色
    	private boolean bold = false; // 是否加粗
    	private int flow = 0; // 文字浮动方向,0:靠左(默认),1:居中,2:靠右,
    	private int fontSize = 0; // 文字大小,0:正常,-2,-1,0,1,2,3,4依次加大,最大到4
    	private Colour backgroundColor = Colour.WHITE; // 单元格填充色
    	private boolean italic;// 是否斜体
    	private int verticalAlign = 1; // 文字上下对齐 0:上 1:中 2:下
    
    	public int getFont() {
    		return font;
    	}
    
    	public void setFont(int font) {
    		this.font = font;
    	}
    
    	public Colour getColor() {
    		return color;
    	}
    
    	public void setColor(Colour color) {
    		this.color = color;
    	}
    
    	public Colour getBackgroundColor() {
    		return backgroundColor;
    	}
    
    	public void setBackgroundColor(Colour backgroundColor) {
    		this.backgroundColor = backgroundColor;
    	}
    
    	public boolean isBold() {
    		return bold;
    	}
    
    	public void setBold(boolean bold) {
    		this.bold = bold;
    	}
    
    	public int getFontSize() {
    		return fontSize;
    	}
    
    	public void setFontSize(int fontSize) {
    		this.fontSize = fontSize;
    	}
    
    	public int getFlow() {
    		return flow;
    	}
    
    	public void setFlow(int flow) {
    		this.flow = flow;
    	}
    
    	public Alignment convertFlow() {
    		return convertFlow(flow);
    	}
    	
    	public static Alignment convertFlow(int flow) {
    		Alignment al = null;
    		switch (flow) {
    		case 0:
    			al = Alignment.LEFT;
    			break;
    		case 1:
    			al = Alignment.CENTRE;
    			break;
    		case 2:
    			al = Alignment.RIGHT;
    			break;
    		default:
    			al = Alignment.LEFT;
    		}
    		return al;
    	}
    
    	public FontName convertFontName() {
    		return convertFontName(font);
    	}
    	
        public static FontName convertFontName(int font) {
    		FontName fn = null;
    		switch (font) {
    		case 0:
    			fn = WritableFont.createFont("SimSun");
    			break;
    		case 1:
    			fn = WritableFont.createFont("KaiTi");
    			break;
    		case 2:
    			fn = WritableFont.createFont("SimHei");
    			break;
    		case 3:
    			fn = WritableFont.createFont("FangSong");
    			break;
    		case 4:
    			fn = WritableFont.createFont("LiSu");
    			break;
    		default:
    			fn = WritableFont.createFont("STSong");
    		}
    		return fn;
    	}
    	
    	public int convertFontSize() {
    		return convertFontSize(fontSize);
    	}
    
    	public static int convertFontSize(int fontSize) {
    		return 12 + fontSize * 2;
    	}
    
    	@Override
    	public boolean equals(Object obj) {
    		boolean eq = false;
    		if (this == obj) {
    			eq = true;
    		} else if (obj != null && obj instanceof ExcelFontFormat) {
    			ExcelFontFormat e = (ExcelFontFormat) obj;
    			if (e.bold == this.bold && e.backgroundColor == this.backgroundColor && e.color == this.color
    					&& e.flow == this.flow && e.font == this.font && e.fontSize == this.fontSize
    					&& e.italic == this.italic) {
    				eq = true;
    			}
    		}
    		return eq;
    	}
    	
    	public boolean isItalic() {
    		return italic;
    	}
    
    	public void setItalic(boolean italic) {
    		this.italic = italic;
    	}
    
    	public int getVerticalAlign() {
    		return verticalAlign;
    	}
    
    	public void setVerticalAlign(int verticalAlign) {
    		this.verticalAlign = verticalAlign;
    	}
    
    }
    	
    

    4个mode类以及有了,我介绍的很简单,每个封装类其实还封装了一些其他的,但因为我的例子就只用到了这些就不多讲了。下面是Excel处理类ExcelHelper,代码比较多,其实大家不用管太多,粘贴过来用就行了,只要知道怎么用他(包括输入给些什么,输出的ByteArrayInputStream怎么用)就行。

    import java.io.ByteArrayInputStream;
    import java.io.ByteArrayOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.lang.reflect.InvocationTargetException;
    import java.lang.reflect.Method;
    import java.math.BigDecimal;
    import java.util.ArrayList;
    import java.util.Collections;
    import java.util.HashMap;
    import java.util.HashSet;
    import java.util.List;
    import java.util.Map;
    import java.util.Set;
    
    import jxl.Workbook;
    import jxl.format.Colour;
    import jxl.format.UnderlineStyle;
    import jxl.format.VerticalAlignment;
    import jxl.write.Label;
    import jxl.write.WritableCellFormat;
    import jxl.write.WritableFont;
    import jxl.write.WritableFont.FontName;
    import jxl.write.WritableSheet;
    import jxl.write.WritableWorkbook;
    import jxl.write.WriteException;
    import jxl.write.biff.JxlWriteException;
    import jxl.write.biff.RowsExceededException;
    
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    
    import com.newsee.dto.common.ExcelColMode;
    import com.newsee.dto.common.ExcelExportRule;
    import com.newsee.dto.common.ExcelFontFormat;
    import com.newsee.dto.common.ExcelHeadCell;
    
    public class ExcelHelper {
        private static Log log = LogFactory.getLog(ExcelHelper.class);
    
    	/**
    	 * 实际需要展现的数据,支持DTO和Map
    	 */
    	private List<Object> rowDatas;
    
    	private Set<Object> writed;
    
    	/**
    	 * 取数据及数据展现相关
    	 */
    	private List<ExcelColMode> colModes;
    
    	/**
    	 * 行头(横向排列),如果有父行头则按父行头的顺序,没有父行头的按List顺序排列
    	 */
    	private List<List<ExcelHeadCell>> headCols;
    
    	/**
    	 * 数据背景颜色区分,0:不区分,1:按行奇偶区分,2:按列奇偶区分
    	 */
    	private int distinguishable;
    
    	/**
    	 * 缓存展现内容的sheet页
    	 */
    	private WritableSheet sheet;
    
    	/**
    	 * 缓存单元格格式
    	 */
    	private Map<ExcelFontFormat, WritableCellFormat> mappedFormat;
    
    	/**
    	 * id字段名称,用于树形结构
    	 */
    	private String idName;
    
    	/**
    	 * 父id字段名称,用于树形结构
    	 */
    	private String pidName;
    
    	private static String ONE_BLANK = " ";
    
    	private int curDataRowIndex;
    	private int curExcelRowIndex;
    	
    	public InputStream writeExcel(List<Object> rowDatas, ExcelExportRule rule) throws IOException, WriteException,
    			SecurityException, IllegalArgumentException, NoSuchMethodException, IllegalAccessException,
    			InvocationTargetException {
    		if (rule != null) {
    			this.rowDatas = rowDatas;
    			this.colModes = rule.getColModes();
    			this.headCols = rule.getHeadCols();
    			this.distinguishable = rule.getDistinguishable();
    			if (validate()) {
    				ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    				WritableWorkbook workbook = Workbook.createWorkbook(outputStream);
    				String sheetName = rule.getSheetName();
    				if (StringUtil.isBlank(sheetName)) {
    					sheetName = "sheet0";
    				}
    				sheet = workbook.createSheet(sheetName, 0);
    				// 设置列宽
    				for (int i = 0; i < colModes.size(); i++) {
    					ExcelColMode colMode = colModes.get(i);
    					if (colMode.getWidth() != null)
    						sheet.setColumnView(i, colMode.getWidth());
    				}
    				writeHeads();
    				// 树形结构
    				if ("1".equals(rule.getHierarchical())) {
    					this.idName = rule.getIdName();
    					this.pidName = rule.getPidName();
    					writeTreeBody();
    				}
    				// 非树形结构
    				else {
    					writeBody();
    				}
    				workbook.write();
    				workbook.close();
    				return new ByteArrayInputStream(outputStream.toByteArray());
    			}
    		} else {
    			log.error("ExcelExportRule为空,无法导出excel");
    		}
    		return null;
    	}
    	
    	private boolean validate() {
    		if (colModes == null || colModes.size() == 0) {
    			log.error("读取数据的规则ExcelExportRule.colModes为空");
    			return false;
    		}
    		return true;
    	}
    	
    	private void writeHeads() throws JxlWriteException, WriteException {
    		curExcelRowIndex = 0;
    		if (headCols != null && !headCols.isEmpty()) {
    			int s = headCols.size();
    			if (s > 1) {
    				caculaterHeadColSpans();
    			}
    			for (int i = 0; i < s; i++) {
    				int tempColIndex = 0;
    				List<ExcelHeadCell> headRowCols = headCols.get(i);
    				for (int j = 0; j < headRowCols.size(); j++) {
    					ExcelHeadCell headCol = headRowCols.get(j);
    					writeHeadCell(headCol, tempColIndex);
    					tempColIndex += headCol.getColSpan();
    				}
    				curExcelRowIndex++;
    			}
    		}
    	}
    
    	// 计算标题需要列数
    	private void caculaterHeadColSpans() {
    	    int s = headCols.size();
    		for (int i = s - 1; i > 0; i--) {
    			List<ExcelHeadCell> subCols = headCols.get(i);
    			Collections.sort(subCols);
    			List<ExcelHeadCell> supCols = headCols.get(i - 1);
    			int[] fatherColSpans = new int[supCols.size()];
    			for (ExcelHeadCell subCol : subCols) {
    				int fi = subCol.getFatherIndex();
    				fatherColSpans[fi] += subCol.getColSpan();
    			}
    			for (int j = 0; j < supCols.size(); j++) {
    				ExcelHeadCell supCol = supCols.get(j);
    				if (fatherColSpans[j] > 0) {
    					supCol.setColSpan(fatherColSpans[j]);
    				}
    			}
    		}
    	}
    
    	private void writeHeadCell(ExcelHeadCell headCol, int colIndex) throws JxlWriteException, WriteException {
    		ExcelFontFormat eff = headCol.getFontFormat();
    		String content = headCol.getContent();
    		int colspan = headCol.getColSpan();
    		if (headCol.getHeight() != null)
    			sheet.setRowView(curExcelRowIndex, headCol.getHeight(), false);
    		writeCell(content, eff, colIndex, colspan);
    	}
    
    	private void writeCell(String content, ExcelFontFormat eff, int colIndex, int colspan) throws JxlWriteException,
    			WriteException {
    		if (eff != null) {
    		WritableCellFormat wcf = getCellFormat(eff);
    			sheet.addCell(new Label(colIndex, curExcelRowIndex, content, wcf));
    		} else {
    			sheet.addCell(new Label(colIndex, curExcelRowIndex, content));
    		}
    		if (colspan > 1) {
    			sheet.mergeCells(colIndex, curExcelRowIndex, colIndex + colspan - 1, curExcelRowIndex);
    		}
    	}
    
    	/**
    	 * 从缓存中取格式化的字体,没有则新建并缓存,生成EXCELL完成后需要清除缓存的字体
    	 * 
    	 * @param eff
    	 * @return
    	 * @throws WriteException
    	 */
    	private WritableCellFormat getCellFormat(ExcelFontFormat eff) throws WriteException {
    		WritableCellFormat wcf = null;
    		if (mappedFormat == null) {
    			mappedFormat = new HashMap<ExcelFontFormat, WritableCellFormat>();
    		} else {
    			wcf = mappedFormat.get(eff);
    		}
    		if (wcf == null) {
    			FontName fn = eff.convertFontName();
    			WritableFont wf = new WritableFont(fn, eff.convertFontSize(), eff.isBold() ? WritableFont.BOLD
    					: WritableFont.NO_BOLD, eff.isItalic(), UnderlineStyle.NO_UNDERLINE, eff.getColor());
    			wcf = new WritableCellFormat(wf);
    			wcf.setBackground(eff.getBackgroundColor());
    			wcf.setAlignment(eff.convertFlow());
    			wcf.setBorder(jxl.format.Border.ALL, jxl.format.BorderLineStyle.THIN, jxl.format.Colour.BLACK);
    			if (eff.getVerticalAlign() == 0)
    				wcf.setVerticalAlignment(VerticalAlignment.TOP);
    			else if (eff.getVerticalAlign() == 1)
    				wcf.setVerticalAlignment(VerticalAlignment.CENTRE);
    			else if (eff.getVerticalAlign() == 2)
    				wcf.setVerticalAlignment(VerticalAlignment.BOTTOM);
    			mappedFormat.put(eff, wcf);
    		}
    		return wcf;
    	}
    
    	private void writeTreeBody() throws RowsExceededException, WriteException, SecurityException,
    			IllegalArgumentException, NoSuchMethodException, IllegalAccessException, InvocationTargetException {
    		if (rowDatas != null && rowDatas.size() > 0) {
    			curDataRowIndex = 1;
    			Object fo = rowDatas.get(0);
    			boolean isMap = fo instanceof Map;
    			if (isMap) {
    				writeTreeDatas4Map();
    			} else {
    				writeTreeDatas4Dto();
    			}
    		}
    	}
    
    	private void writeTreeDatas4Map() throws JxlWriteException, WriteException {
    		if (writed == null) {
    		writed = new HashSet<Object>();
    		}
    		for (Object data : rowDatas) {
    			if (!writed.contains(data)) {
    				Map m = (Map) data;
    				Object pid = m.get(pidName);
    				if (pid == null) {
    					writeRow4Map(data);
    					curDataRowIndex++;
    					curExcelRowIndex++;
    					writed.add(data);
    					writeSubDatas4Map(m, 1);
    				} else {
    					if (pid instanceof String) {
    						String ps = (String) pid;
    						if (StringUtil.isBlank(ps) || (Integer.valueOf(ps) <= 0)) {
    							writeRow4Map(data);
    							curDataRowIndex++;
    							curExcelRowIndex++;
    							writed.add(data);
    							writeSubDatas4Map(m, 1);
    						}
    					} else if (pid instanceof Integer) {
    						Integer pi = (Integer) pid;
    						if (pi <= 0) {
    							writeRow4Map(data);
    							curDataRowIndex++;
    							curExcelRowIndex++;
    							writed.add(data);
    							writeSubDatas4Map(m, 1);
    						}
    					} else if (pid instanceof Long) {
    						Long pl = (Long) pid;
    						if (pl.compareTo(0L) <= 0) {
    							writeRow4Map(data);
    							curDataRowIndex++;
    							curExcelRowIndex++;
    							writed.add(data);
    							writeSubDatas4Map(m, 1);
    						}
    					} else if (pid instanceof BigDecimal) {
    						if (((BigDecimal) pid).compareTo(BigDecimal.ZERO) <= 0) {
    							writeRow4Map(data);
    							curDataRowIndex++;
    							curExcelRowIndex++;
    							writed.add(data);
    							writeSubDatas4Map(m, 1);
    						}
    					}
    				}
    			}
    		}
    	}
    
    	private void writeSubDatas4Map(Map father, int deep) throws RowsExceededException, WriteException {
    		for (Object data : rowDatas) {
    			if (!writed.contains(data)) {
    		        Map m = (Map) data;
    				Object pid = m.get(pidName);
    				Object fid = father.get(idName);
    				if (pid != null) {
    					if (pid instanceof Long) {
    						Long pl = (Long) pid;
    						Long fl = null;
    						try {
    							fl = (Long) fid;
    						} catch (Exception e) {
    							if (fid instanceof BigDecimal) {
    								fl = ((BigDecimal) fid).longValue();
    							}
    						}
    						if (pl.equals(fl)) {
    							writeSubRow4Map(m, deep);
    							curDataRowIndex++;
    							curExcelRowIndex++;
    							int subDeep = deep + 1;
    							writed.add(data);
    							writeSubDatas4Map(m, subDeep);
    						}
    					} else if (pid instanceof String) {
    						String ps = (String) pid;
    						String fs = null;
    						try {
    							fs = (String) fid;
    						} catch (Exception e) {
    							if (fid instanceof BigDecimal) {
    								fs = ((BigDecimal) fid).toString();
    							}
    						}
    						if (ps.equals(fs)) {
    							writeSubRow4Map(m, deep);
    							curDataRowIndex++;
    							curExcelRowIndex++;
    							int subDeep = deep + 1;
    							writed.add(data);
    							writeSubDatas4Map(m, subDeep);
    						}
    					} else if (pid instanceof Integer) {
    						Integer pi = (Integer) pid;
    						Integer fi = null;
    						try {
    							fi = (Integer) fid;
    						} catch (Exception e) {
    							if (fid instanceof BigDecimal) {
    								fi = ((BigDecimal) fid).intValue();
    							}
    						}
    						if (pi.equals(fi)) {
    							writeSubRow4Map(m, deep);
    							curDataRowIndex++;
    							curExcelRowIndex++;
    							int subDeep = deep + 1;
    							writed.add(data);
    							writeSubDatas4Map(m, subDeep);
    						}
    					}
    				}
    			}
    		}
    	}
    
    	private void writeSubRow4Map(Map subMap, int deep) throws RowsExceededException, WriteException {
    	int tempColIndex = 0;
    		for (ExcelColMode mode : colModes) {
    			Object o = subMap.get(mode.getName());
    			String content = null;
    			if (o == null)
    				content = "";
    			else {
    				if (mode.getContentFormatter() != null)
    					content = mode.getContentFormatter().format(o);
    				else
    					content = o.toString();
    			}
    			if (tempColIndex == 0) {
    				int blankCount = 6 * deep;
    				for (int i = 0; i < blankCount; i++) {
    					content = ONE_BLANK + content;
    				}
    			}
    			writeContent(content, mode, tempColIndex);
    			tempColIndex++;
    		}
    	}
    
    	private void writeTreeDatas4Dto() throws SecurityException, IllegalArgumentException, NoSuchMethodException,
    			IllegalAccessException, InvocationTargetException, JxlWriteException, WriteException {
    		if (writed == null) {
    			writed = new HashSet<Object>();
    		}
    		for (Object data : rowDatas) {
    		if (!writed.contains(data)) {
    				Object pid = getValue(data, pidName);
    				if (pid == null) {
    					writeRow4Dto(data);
    					curDataRowIndex++;
    					curExcelRowIndex++;
    					writed.add(data);
    					writeSubDatas4Dto(data, 1);
    				} else {
    					if (pid instanceof String) {
    						String ps = (String) pid;
    						if (StringUtil.isBlank(ps) || (Integer.valueOf(ps)) <= 0) {
    							writeRow4Dto(data);
    							curDataRowIndex++;
    							curExcelRowIndex++;
    							writed.add(data);
    							writeSubDatas4Dto(data, 1);
    						}
    					} else if (pid instanceof Integer) {
    						Integer pi = (Integer) pid;
    						if (pi <= 0) {
    							writeRow4Dto(data);
    							curDataRowIndex++;
    							curExcelRowIndex++;
    							writed.add(data);
    							writeSubDatas4Dto(data, 1);
    						}
    					} else if (pid instanceof Long) {
    						Long pl = (Long) pid;
    						if (pl.compareTo(0L) <= 0) {
    							writeRow4Dto(data);
    							curDataRowIndex++;
    							curExcelRowIndex++;
    							writed.add(data);
    							writeSubDatas4Dto(data, 1);
    						}
    					}
    				}
    			}
    		}
    	}
    
    	private void writeSubDatas4Dto(Object father, int deep) throws SecurityException, IllegalArgumentException,
    			NoSuchMethodException, IllegalAccessException, InvocationTargetException, RowsExceededException,
    			WriteException {
    		for (Object data : rowDatas) {
    			if (!writed.contains(data)) {
    			Object pid = getValue(data, pidName);
    				Object fid = getValue(father, idName);
    				if (pid != null) {
    					if (pid instanceof Long) {
    						Long pl = (Long) pid;
    						Long fl = (Long) fid;
    						if (pl.equals(fl)) {
    							writeSubRow4Dto(data, deep);
    							curDataRowIndex++;
    							curExcelRowIndex++;
    							int subDeep = deep + 1;
    							writed.add(data);
    							writeSubDatas4Dto(data, subDeep);
    						}
    					} else if (pid instanceof String) {
    						String ps = (String) pid;
    						String fs = (String) fid;
    						if (ps.equals(fs)) {
    							writeSubRow4Dto(data, deep);
    							curDataRowIndex++;
    							curExcelRowIndex++;
    							int subDeep = deep + 1;
    							writed.add(data);
    							writeSubDatas4Dto(data, subDeep);
    						}
    					} else if (pid instanceof Integer) {
    						Integer pi = (Integer) pid;
    						Integer fi = (Integer) fid;
    						if (pi.equals(fi)) {
    							writeSubRow4Dto(data, deep);
    							curDataRowIndex++;
    							curExcelRowIndex++;
    							int subDeep = deep + 1;
    							writed.add(data);
    							writeSubDatas4Dto(data, subDeep);
    						}
    					}
    				}
    			}
    		}
    	}
    
    	private void writeSubRow4Dto(Object subData, int deep) throws SecurityException, IllegalArgumentException,
    			NoSuchMethodException, IllegalAccessException, InvocationTargetException, RowsExceededException,WriteException {
    		int tempColIndex = 0;
    		for (ExcelColMode mode : colModes) {
    			String field = mode.getName();
    			Object o = getValue(subData, field);
    			String content = null;
    			if (o == null)
    				content = "";
    			else {
    				if (mode.getContentFormatter() != null)
    					content = mode.getContentFormatter().format(o);
    				else
    					content = o.toString();
    			}
    			if (tempColIndex == 0) {
    				int blankCount = 6 * deep;
    				for (int i = 0; i < blankCount; i++) {
    					content = ONE_BLANK + content;
    				}
    			}
    			writeContent(content, mode, tempColIndex);
    		}
    	}
    
    	private void writeBody() throws RowsExceededException, WriteException, SecurityException, IllegalArgumentException,
    			NoSuchMethodException, IllegalAccessException, InvocationTargetException {
    		if (rowDatas != null && rowDatas.size() > 0) {
    			curDataRowIndex = 1;
    			Object fo = rowDatas.get(0);
    			if (fo instanceof Map) {
    				writeDatas4Map();
    			} else {
    				writeDatas4Dto();
    			}
    		}
    	}
    
    	private void writeDatas4Map() throws JxlWriteException, WriteException {
    		for (Object data : rowDatas) {
    			writeRow4Map(data);
    			curDataRowIndex++;
    			curExcelRowIndex++;
    			}
    	}
    
    	private void writeDatas4Dto() throws JxlWriteException, WriteException, SecurityException,
    			IllegalArgumentException, NoSuchMethodException, IllegalAccessException, InvocationTargetException {
    		for (Object data : rowDatas) {
    			writeRow4Dto(data);
    			curDataRowIndex++;
    			curExcelRowIndex++;
    		}
    	}
    
    	private void writeRow4Map(Object data) throws JxlWriteException, WriteException {
    		Map m = (Map) data;
    		int tempColIndex = 0;
    		for (ExcelColMode mode : colModes) {
    			Object o = m.get(mode.getName());
    			String content = null;
    			if (o == null)
    				content = "";
    			else {
    				if (mode.getContentFormatter() != null)
    					content = mode.getContentFormatter().format(o);
    				else
    					content = o.toString();
    			}
    			writeContent(content, mode, tempColIndex);
    			tempColIndex++;
    		}
    	}
    
    	private void writeContent(String content, ExcelColMode mode, int colIndex) throws RowsExceededException,
    			WriteException {
    		ExcelFontFormat eff = mode.getFontFormat();
    		if (distinguishable == 1) {
    			if (eff == null) {
    				eff = new ExcelFontFormat();
    			}
    			if (curDataRowIndex % 2 == 1) {
    				eff.setBackgroundColor(Colour.WHITE);
    			} else {
    				eff.setBackgroundColor(Colour.GRAY_25);
    			}
    		} else if (distinguishable == 2) {
    			if (eff == null) {
    				eff = new ExcelFontFormat();
    			}
    			if (colIndex % 2 == 1) {
    				eff.setBackgroundColor(Colour.WHITE);
    			} else {
    				eff.setBackgroundColor(Colour.GRAY_25);
    			}
    		}
    		writeCell(content, eff, colIndex, 1);
    	}
    
    	private void writeRow4Dto(Object data) throws JxlWriteException, WriteException, SecurityException,
    			IllegalArgumentException, NoSuchMethodException, IllegalAccessException, InvocationTargetException {
    		int tempColIndex = 0;
    		for (ExcelColMode mode : colModes) {
    			String field = mode.getName();
    			Object o = getValue(data, field);
    			String content = null;
    			if (o == null)
    				content = "";
    			else {
    				if (mode.getContentFormatter() != null)
    					content = mode.getContentFormatter().format(o);
    				else
    					content = o.toString();
    			}
    			writeContent(content, mode, tempColIndex);
    			tempColIndex++;
    		}
    	}
    
    	private Object getValue(Object data, String feild) throws SecurityException, NoSuchMethodException,
    			IllegalArgumentException, IllegalAccessException, InvocationTargetException {
    		if (feild.contains(".")) {
    			String fileds[] = feild.split("\\.");
    			Object value = null;
    			String methodName = "get" + fileds[0].substring(0, 1).toUpperCase() + fileds[0].substring(1);
    			try {
    				Method getMethod = data.getClass().getMethod(methodName);
    				value = getMethod.invoke(data);
    			} catch (NoSuchMethodException e) {
    				// e.printStackTrace();
    				try {
    					methodName = "get" + feild.substring(0, 1).toLowerCase() + feild.substring(1);
    					Method getMethod = data.getClass().getMethod(methodName);
    					value = getMethod.invoke(data);
    				} catch (Exception e2) {
    					e.printStackTrace();
    				}
    			}
    
    			Object value2 = null;
    			String methodName2 = "get" + fileds[1].substring(0, 1).toUpperCase() + fileds[1].substring(1);
    			try {
    				Method getMethod = value.getClass().getMethod(methodName2);
    				value2 = getMethod.invoke(value);
    			} catch (NoSuchMethodException e) {
    				// e.printStackTrace();
    				try {
    					methodName = "get" + fileds[1].substring(0, 1).toLowerCase() + fileds[1].substring(1);
    					Method getMethod = data.getClass().getMethod(methodName);
    					value = getMethod.invoke(value);
    				} catch (Exception e2) {
    					e.printStackTrace();
    				}
    			}
    			return value2;
    		} else {
    			Object value = null;
    			String methodName = "get" + feild.substring(0, 1).toUpperCase() + feild.substring(1);
    			try {
    				Method getMethod = data.getClass().getMethod(methodName);
    				value = getMethod.invoke(data);
    			} catch (NoSuchMethodException e) {
    				// e.printStackTrace();
    				try {
    					methodName = "get" + feild.substring(0, 1).toLowerCase() + feild.substring(1);
    					Method getMethod = data.getClass().getMethod(methodName);
    					value = getMethod.invoke(data);
    				} catch (Exception e2) {
    					e.printStackTrace();
    				}
    			}
    			return value;
    		}
    	}
    
    	/**
    	 * 释放资源
    	 */
    	public void clear() {
    		if (writed != null) {
    			writed = null;
    		}
    		if (rowDatas != null) {
    			rowDatas = null;
    		}
    		if (colModes != null) {
    			colModes = null;
    		}
    		if (headCols != null) {
    			headCols = null;
    		}
    		if (sheet != null) {
    			sheet = null;
    		}
    		if (mappedFormat != null) {
    			mappedFormat = null;
    		}
    		if (idName != null) {
    			idName = null;
    		}
    		if (pidName != null) {
    			pidName = null;
    		}
    	}
    
    	private static boolean isContainStyle(String style, String s1, String s2) {
    		String styleArr[] = style.split(";");
    		for (String s : styleArr) {
    			if (s.contains(s1) && s.contains(s2))
    				return true;
    		}
    		return false;
    	}
    
    	private static void writeSheetData(Integer startRow[], int level, Map<String, String> map, List<String> ridAry,
    			List<Map<String, String>> allData, WritableSheet sheet) throws RowsExceededException, WriteException {
    		String tab = "";
    		for (int i = 0; i < level - 1; i++) {
    			tab += "   ";
    		}
    		sheet.addCell(new Label(0, startRow[0], tab + map.get("index")));
    		for (int i = 0; i < ridAry.size(); i++) {
    			sheet.addCell(new Label(i + 1, startRow[0], map.get("R" + ridAry.get(i))));
    		}
    		startRow[0]++;
    		List<Map<String, String>> children = getChildren(allData, map.get("id"));
    		if (children != null && children.size() > 0) {
    			for (Map<String, String> child : children) {
    				writeSheetData(startRow, level + 1, child, ridAry, allData, sheet);
    			}
    		}
    	}
    
    	private static List<Map<String, String>> getFirstLeve(List<Map<String, String>> list) {
    		List<Map<String, String>> firstLevel = new ArrayList<Map<String, String>>();
    		if (list != null && list.size() > 0) {
    			for (Map<String, String> map : list) {
    				if (map.get("parentId") == null || map.get("parentId").length() == 0)
    					firstLevel.add(map);
    			}
    		}
    		return firstLevel;
    	}
    
    	private static List<Map<String, String>> getChildren(List<Map<String, String>> list, String id) {
    		List<Map<String, String>> children = new ArrayList<Map<String, String>>();
    		if (list != null && list.size() > 0) {
    			for (Map<String, String> map : list) {
    				if (map.get("parentId") != null && map.get("parentId").toString().equals(id))
    					children.add(map);
    			}
    		}
    		return children;
    	}
    
    	private static String getIndexData(String code, String rid, Map<String, List<HashMap<String, Object>>> tabDataMap) {
    		if (code == null || code.length() == 0)
    			return "";
    		if (tabDataMap == null || tabDataMap.size() == 0)
    			return "0";
    		String codeArr[] = code.split("\\.");
    		if (codeArr.length != 2)
    			return "";
    		List<HashMap<String, Object>> listMap = tabDataMap.get(codeArr[0]);
    		if (listMap == null || listMap.size() == 0)
    			return "0";
    		else {
    			for (int i = 0; i < listMap.size(); i++) {
    				HashMap<String, Object> map = listMap.get(i);
    				if (map.get("P_R_ID").toString().equals(rid)) {
    					Object obj = map.get(codeArr[1]);
    					if (obj != null)
    						return obj.toString();
    					else
    						return "0";
    					}
    			}
    			return "";
    		}
    	}
    
    	private static String getUnit(String code, Map<String, String> tabUnitMap) {
    		String result = "";
    		if (code != null) {
    			String codeArr[] = code.split("\\.");
    			if (codeArr.length == 2) {
    				if (tabUnitMap.get(codeArr[0]) != null)
    					result = tabUnitMap.get(codeArr[0]);
    			}
    		}
    		return result;
    	}
    }
    

    接下来是测试类。

    public class TestExcelUtil {
    	@Test
    	public void test() throws Exception {
    		ExcelHelper excelHelper = new ExcelHelper();
    		List<Object> rowDatas = new ArrayList<Object>();
    		Map<String, String> map = new HashMap<String, String>();
    		map.put("userName", "张三");
    		map.put("sex", "男");
    		rowDatas.add(map);
    
    		Map<String, String> map1 = new HashMap<String, String>();
    		map1.put("userName", "李四");
    		map1.put("sex", "男");
    		rowDatas.add(map1);
    
    		List<ExcelHeadCell> headCells = new ArrayList<ExcelHeadCell>();
    		headCells.add(new ExcelHeadCell("姓名"));
    		headCells.add(new ExcelHeadCell("性别"));
    		List<List<ExcelHeadCell>> headCellsList = new ArrayList<List<ExcelHeadCell>>();
    		headCellsList.add(headCells);
    		ExcelExportRule rule = new ExcelExportRule();
    		rule.setSheetName("测试");
    		rule.setHeadCols(headCellsList);
    
    		List<ExcelColMode> colModes = new ArrayList<ExcelColMode>();
    		colModes.add(new ExcelColMode("userName"));
    		colModes.add(new ExcelColMode("sex"));
    		rule.setColModes(colModes);
    
    		InputStream inputStream = excelHelper.writeExcel(rowDatas, rule);
    		File file = new File("d:/test.xls");
    		if (file.exists())
    			file.delete();
    		file.createNewFile();
    		FileOutputStream fileOutputStream = new FileOutputStream(file);
    		byte b[] = new byte[512];
    		int i = inputStream.read(b);
    		while (i != -1) {
    			fileOutputStream.write(b);
    			i = inputStream.read(b);
    		}
    		fileOutputStream.flush();
    		fileOutputStream.close();
    		inputStream.close();
    	}
    }
    

    通过看测试类应该就知道使用方法了吧,最后再给一个实际的从页面到后台的例子:从页面发来的一个请求,包含了表格的标题、内容、sheet名、Excel名,然后实现生成并下载Excel(在页面会弹出选择保存路径框)的过程。
    首先是页面:

    <!DOCTYPE html>
    <html>
    <head>
    	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    	<meta http-equiv="X-UA-Compatible" content="IE=EDGE" />
    	<title>导出Excel</title>
    	<script src="../../../ns-face-sys/common/lib/jquery-1.11.2.min.js"></script>
    	<script src="../../../ns-face-sys/common/js/newsee.js"></script>
    	<script src="../../../ns-face-sys/common/js/newsee.ui.js"></script>
    </head>
    <body>
    <form id="formid"  name= "myform" method = "post"  action = "/ns-face-sys/rest/system/export/excel">
    	<input id="headCells" name="headCells" value="" type="hidden"/>
    	<input id="rowDatas" name="rowDatas" value="" type="hidden"/>
    	<input id="sheetName" name="sheetName" value="人员信息" type="hidden"/>
    	<input id="excelName" name="excelName" value="人员信息表" type="hidden"/>
    	<table id="table">
    		<tr>
    			<td>序号</td>
    			<td>姓名</td>
    			<td>备注</td>
    		</tr>
    		<tr>
    			<td>1</td>
    			<td>yjc</td>
    	        <td>欣lp</td>
    		</tr>
    		<tr>
    			<td>2</td>
    			<td>lsx</td>
    			<td>诚lg</td>
    		</tr>
    		<tr>
    			<td>3</td>
    			<td>测试1</td>
    			<td>备注1</td>
    		</tr>
    		<tr>
    			<td>4</td>
    			<td>测试2</td>
    			<td>备注2</td>
    		</tr>
    	</table>
    	<input id="export" type="button" value="导出Excel" onclick="exportExcel()"/>
    </form>
    <script type="text/javascript" src="export_excel.js"></script>
    </body>
    </html>
    

    然后是js,里面做了把表格数据整合成后台需要的数据(每列数据用",“隔开,每行数据用”;"隔开,标题和内容分别放在隐藏的input里传给后台解析),放到隐藏域里,然后以提交表单的形式发送到后台。
    千万注意:不要使用ajax请求,虽然也能发到后台,但会导致浏览器收不到response,导致弹不出选择保存路径的弹出框了!!!

    function exportExcel(){
    	document.charset='utf-8';
    	var head = getHead();
    	var data = getData();
    //	var path = getPath();
    	$("#headCells").val(head);
    	$("#rowDatas").val(data);
    	$("#formid").submit();
    	
    //	var postData = [{
    //        Request: {
    //            Data: {
    //            	headCells : head,
    //    			rowDatas : data,
    //    			sheetName : "人员信息",
    //    			path : path,
    //    			excelName : "人员信息表"
    //            }
    //        }
    //    }]
    //	$.ajax({
    //            url: "/ns-face-sys/rest/system/export/excel",
    //            type: "post",
    //            dataType: 'json',
    //            async: true,
    //            data: { 
    //            	request: newsee.base.JsonArrayToStringCfz(postData) 
    //            }
    //	});
    function getHead(){
    	var head = "";
    	var uls = $("#table").find("tr");
    	var lis =  $(uls[0]).children("td");
    	for(var j=0;j<lis.length;j++){
    		if(j == lis.length-1){
    			head += $(lis[j]).text();
    		}else{
    			head += $(lis[j]).text() + ",";
    		}
    	}
    	return head;
    }
    
    function getData(){
    	var data = "";
    	var uls = $("#table").find("tr");
    	for(var i=1;i<uls.length;i++){
    		var lis =  $(uls[i]).children("td");
    		for(var j=0;j<lis.length;j++){
    			if(j == lis.length-1 && i == uls.length-1){
    				data += $(lis[j]).text();
    			}else if(j == lis.length-1 && i != uls.length-1){
    				data += $(lis[j]).text() + ";";
    			}else{
    				data += $(lis[j]).text() + ",";
    			}
    		}
    	}
    	return data;
    }
    
    function getPath(){
    	return "D:";
    }
    

    然后时控制器层代码,里面为了解决页面过来的数据有中文乱码,采用了笨方法,一个一个指定解码方式

    import javax.servlet.http.HttpServletResponse;
    import javax.ws.rs.FormParam;
    import javax.ws.rs.POST;
    import javax.ws.rs.Path;
    import javax.ws.rs.core.Context;
    
    import org.springframework.stereotype.Controller;
    
    import com.newsee.face.common.ExportExcel;
    
    @Path("system")
    @Controller
    public class SystemExcelFace {
    	
    	/**
    	 * 导出excel入口
    	 * @param request
    	 * @param response
    	 * @throws Exception
    	 */
    	@POST
    	@Path("/export/excel")
    	public void showImg(@FormParam("headCells") String headCells,
    			@FormParam("rowDatas") String rowDatas,
    			@FormParam("sheetName") String sheetName,
    			@FormParam("excelName") String excelName,
    			@Context HttpServletResponse response) throws Exception {
    		headCells=new String(headCells.getBytes("iso-8859-1"),"UTF-8");
    		rowDatas=new String(rowDatas.getBytes("iso-8859-1"),"UTF-8");
    		sheetName=new String(sheetName.getBytes("iso-8859-1"),"UTF-8");
    		excelName=new String(excelName.getBytes("iso-8859-1"),"UTF-8");
    		new ExportExcel().exportExcel(rowDatas, headCells, sheetName, excelName,response);
    	}
    
    }
    

    然后就是业务逻辑层了ExportExcel,这里就调用了之前介绍的导出Excel处理类ExcelHelper。

    import java.io.BufferedOutputStream;
    import java.io.InputStream;
    import java.io.OutputStream;
    import java.net.URLEncoder;
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    import javax.servlet.http.HttpServletResponse;
    
    import com.newsee.dto.common.ExcelColMode;
    import com.newsee.dto.common.ExcelExportRule;
    import com.newsee.dto.common.ExcelHeadCell;
    import com.newsee.util.ExcelHelper;
    import com.newsee.util.StringUtil;
    
    /**
     * 导出excel
     * 
     * @author yaojiacheng
     *
     */
    public class ExportExcel {
    
    	/**
    	 * 导出excel
    	 * 
    	 * @param requestContent
    	 * @return
    	 */
    	public void exportExcel(String rowData,String headCell,String sheetName,String excelName, HttpServletResponse response) throws Exception {
    	if (StringUtil.isAnyBlank(rowData, headCell)) {
    			return;
    		}
    		if(response == null){
    			return;
    		}
    
    		ExcelHelper excelHelper = new ExcelHelper();
    
    		List<ExcelHeadCell> headCells = new ArrayList<ExcelHeadCell>();
    		String[] headCellsArray = headCell.split(",");
    		for (String hc : headCellsArray) {
    			headCells.add(new ExcelHeadCell(hc));
    		}
    		List<List<ExcelHeadCell>> headCellsList = new ArrayList<List<ExcelHeadCell>>();
    		headCellsList.add(headCells);
    		
    		ExcelExportRule rule = new ExcelExportRule();
    		if (StringUtil.isBlank(sheetName)) {
    			rule.setSheetName("测试");
    		} else {
    			rule.setSheetName(sheetName);
    		}
    		rule.setHeadCols(headCellsList);
    
    		List<ExcelColMode> colModes = new ArrayList<ExcelColMode>();
    		for (int i = 0; i < headCellsArray.length; i++) {
    			colModes.add(new ExcelColMode(i + ""));
    		}
    		rule.setColModes(colModes);
    		
            List<Object> rowDatas = new ArrayList<Object>();
    		String[] rowDataArrays = rowData.split(";");
    		for (String rowDataArray : rowDataArrays) {
    			Map<String, String> map = new HashMap<String, String>();
    			String[] rowDataAs = rowDataArray.split(",");
    			for (int i = 0; i < rowDataAs.length; i++) {
    				map.put(i + "", rowDataAs[i]);
    			}
    			rowDatas.add(map);
    		}
    
    		InputStream fis = excelHelper.writeExcel(rowDatas, rule);
    		byte b[] = new byte[512];
    		// 清空response
    		response.reset();
    		// 设置response的Header
    		response.addHeader("Content-Disposition", "attachment;filename=" + 
    		URLEncoder.encode(excelName, "UTF-8")+ ".xls");
    		response.addHeader("Content-Length", "" + fis.available());
    		OutputStream toClient = new BufferedOutputStream(
    				response.getOutputStream());
    		response.setContentType("application/vnd.ms-excel;charset=gb2312");
    		int i = fis.read(b);
    		while (i != -1) {
    			toClient.write(b);
    			i = fis.read(b);
    		}
    		toClient.flush();
    		toClient.close();
    		fis.close();
    	}
    
    }
    

    如上,使用response.getOutputStream()得到的输出流来write数据后会先放在缓存中,到执行toClient.flush()就会在页面弹出选择保存路径的选择框,点击保存后就下载成功了。这里没有Excel导出的过程,直接将经过Excel处理类得到的InputStream拿过来读取,然后写进OutputStream下载,通常这是最优的方式。
    以上代码没有添加合并单元格的功能,需要合并单元格的同学们,可以自行修改代码,合并调用的方法就是:WritableSheet.mergeCells(int m,int n,int p,int q); 作用是从(m,n)到(p,q)的单元格全部合并,比如:
    //合并第一列第二行到第六列第二行的所有单元格
    sheet.mergeCells(0,1,5,1); //注意了m和p指的是列,n和q指的是行
    可以在workbook.write();workbook.close();之前调用即可!
    还需要注意的是,合并的单元格显示的内容是第一个单元格的内容,不是所有单元格的内容追加!

    展开全文
  • java导出excel

    2015-03-24 21:28:37
    java代码导出excel表格,常用于解决页面前台展示为table,实现该table的导出,详细可以参照博客介绍。
  • java导出Excel

    热门讨论 2018-08-26 19:23:13
    <selectid="export"resultMap="companyResultMap"parameterType="java.util.Map"> select, DATE(start_time)startTimeExport, (CASEstatusWHEN1THEN"报名中"WHEN2THEN"进行中"WHEN0THEN"已完成"ELSEstatusEND)...

    Controller层:

    @RequestMapping("/export")
    @ResponseBody
    publicCommonStatusexport(Companybean,HttpServletRequestrequest,HttpServletResponseresponse){
    
    ExcelUtil<Company>util=newExcelUtil<Company>(Company.class);
    //可以设置条件
    List<Company>list=this.service.export(null);
    
    ByteArrayOutputStreamout=newByteArrayOutputStream();
    StringfileName="入孵入驻公司信息.xls";
    util.exportExcel(list,fileName,out);//导出
    
    download(fileName,out,response);
    
    returnsuccess();
    }
    

    mapper.xml

    <!--导出-->
    <selectid="export"resultMap="companyResultMap"parameterType="java.util.Map">
    select<includerefid="table_columns"/>,
    DATE(start_time)startTimeExport,
    (CASEstatusWHEN1THEN"报名中"WHEN2THEN"进行中"WHEN0THEN"已完成"ELSEstatusEND)statusChinese,
    (CASEpostion_typeWHEN1THEN"独立办公室"WHEN2THEN"开放工位"ELSEpostion_typeEND)postionTypeName,
    (CASEmode_paymentWHEN1THEN"工位/日租"WHEN2THEN"工位/月租"WHEN3THEN"面积/天"ELSEmode_paymentEND)modePaymentName
    fromt_company
    <includerefid="whereSql"/>
    </select>
    
    展开全文
  • 1. 使用easyexcel导出1.1 引入相关maven依赖com.alibabaeasyexcel1.1.11.2 简单导出excel文件相关代码excel导出相关实体类import com.alibaba.excel.annotation.ExcelProperty;import ...

    1. 使用easyexcel导出

    1.1 引入相关maven依赖

    com.alibaba

    easyexcel

    1.1.1

    1.2 简单导出excel文件相关代码

    excel导出相关实体类

    import com.alibaba.excel.annotation.ExcelProperty;

    import com.alibaba.excel.metadata.BaseRowModel;

    import java.io.Serializable;

    /**

    * @description: excel导出相关实体类

    * @author: zyb

    * @date: 2020/10/13 17:47

    */

    @Data

    public class JavaBeanExcel extends BaseRowModel implements Serializable {

    private static final long serialVersionUID = 8838958399566303983L;

    @ExcelProperty(value = "第一列名称", index = 0)

    private String property1;

    @ExcelProperty(value = "第二列名称", index = 1)

    private String property2;

    ......

    }

    实现代码

    import com.alibaba.excel.ExcelWriter;

    import com.alibaba.excel.metadata.Sheet;

    import com.alibaba.excel.support.ExcelTypeEnum;

    import work.goods.importGoods.JavaBeanExcel ;

    import javax.servlet.http.HttpServletResponse;

    import java.io.FileOutputStream;

    import java.io.IOException;

    import java.io.OutputStream;

    import java.util.List;

    /**

    * @description: 导出excel文件相关工具类

    * @author: zyb

    * @date: 2020/10/14 16:05

    */

    public class ExportExcelUtils {

    /**

    * 使用文件输出流导出excel (可用于单元测试或者主函数中导出excel)

    * @param list 导出对象集合

    * @param filePath 导出文件路径+文件名

    */

    public static void easyWrite(List list, String filePath){

    ExcelWriter writer = null;

    FileOutputStream outputStream = null;

    try {

    outputStream = new FileOutputStream(filePath);

    //实例化 ExcelWriter

    writer = new ExcelWriter(outputStream, ExcelTypeEnum.XLSX, true);

    //实例化表单

    Sheet sheet = new Sheet(1, 0, JavaBeanExcel.class);

    sheet.setSheetName("目录");

    writer.write(list, sheet);

    writer.finish();

    outputStream.flush();

    } catch (IOException e) {

    e.printStackTrace();

    } finally {

    if (outputStream != null) {

    try {

    outputStream.close();

    } catch (IOException e) {

    e.printStackTrace();

    }

    }

    }

    }

    /**

    * 根据HttpServletResponse对象触发导出excel文件(可用于前端请求触发导出excel文件)

    * @param response HttpServletResponse对象

    * @param list 导出对象集合

    */

    public static void exportXLSX(HttpServletResponse response, List list){

    //添加响应头信息

    //设置文件名

    response.setHeader("Content-disposition", "attachment; filename=" + "文件名.xlsx");

    //设置类型

    response.setContentType("application/msexcel;charset=UTF-8");

    //设置头

    response.setHeader("Pragma", "No-cache");

    //设置头

    response.setHeader("Cache-Control", "no-cache");

    //设置日期头

    response.setDateHeader("Expires", 0);

    ExcelWriter writer = null;

    OutputStream outputStream = null;

    try {

    outputStream = response.getOutputStream();

    //实例化 ExcelWriter

    writer = new ExcelWriter(outputStream, ExcelTypeEnum.XLSX, true);

    //实例化表单

    Sheet sheet = new Sheet(1, 0, GoodsImgExcel.class);

    sheet.setSheetName("目录");

    writer.write(list, sheet);

    writer.finish();

    outputStream.flush();

    } catch (IOException e) {

    e.printStackTrace();

    } finally {

    if (outputStream != null){

    try {

    outputStream.close();

    } catch (IOException e) {

    e.printStackTrace();

    }

    }

    }

    }

    }

    展开全文
  • java 导出excel

    2018-05-02 17:51:04
    // 生成excel File outFile = new File(exportFileSavePath + File.separator + excelFileName); try { // 设置response的编码方式 request.setCharacterEncoding("UTF-8"); response....
    		// 生成excel
    File outFile = new File(exportFileSavePath + File.separator + excelFileName);
    try {
    // 设置response的编码方式
    request.setCharacterEncoding("UTF-8");
    response.setContentType("application/msexcel");
    // 设置附加文件名
    response.setHeader("Content-Disposition",
    "attachment;filename=" + URLEncoder.encode(excelFileName, StandardCharsets.UTF_8.name()));
    } catch (Exception e) {
    logger.error("Excel导出编码异常:" + e);
    }
    // 读出文件到i/o流
    try (BufferedInputStream buff = new BufferedInputStream(new FileInputStream(outFile));
    OutputStream os = response.getOutputStream()) {
    byte[] b = new byte[1024];// 相当于我们的缓存
    long k = 0;// 该值用于计算当前实际下载了多少字节
    // 从response对象中得到输出流,准备下载
    // 开始循环下载
    while (k < outFile.length()) {
    int j = buff.read(b, 0, 1024);
    k += j;
    // 将b中的数据写到客户端的内存
    os.write(b, 0, j);
    }
    // 将写入到客户端的内存的数据,刷新到磁盘
    os.flush();
    } catch (Exception e) {
    logger.error(e.toString());
    }
    展开全文
  • 当前B/S模式已成为应用开发的主流,而在开发企业办公系统的过程中,常常有客户这样子要求:把系统数据库中的数据导出到Excel,用户...目前从网上找到的比较常用的实现Java导出Excel的技术有三种 POI、JXL、PageOffi...
  • Java 通过Xml导出Excel文件,Java Excel 导出工具类,Java导出Excel工具类   ============================== ©Copyright 蕃薯耀 2017年9月13日 http://www.cnblogs.com/fanshuyao/   直接上代码: ...
  • java 导出Excel

    2010-08-09 09:37:45
    我想把查询结果 也就是list 能导出本地到excel ,希望能相信讲解,最好有源代码 还有我的积分不多了,不能多给 谢谢了
  • JAVA导出EXCEL

    2011-12-07 23:51:33
    对于POI而言,可以说是导出EXCEL的基础,其他的第三方工具都是在其基础上做的封装,但是可操作性上由于要逐行逐列的进行操作,所以可操作性上来说比较繁琐,个人不推荐使用。 二、JXL JXL丰富了许多的函数来解
  • java导出excel,txt

    2017-08-10 15:33:25
    java导出excel
  • java导出Excel表格

    2016-05-06 09:27:02
    java导出Excel表格,支持标题合并居中,字体修改,带表头,全部是调好的项目搭起就可以用,该项目是在三层架构中实现
  • 主要介绍了java导出Excel方法,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友们下面随着小编来一起学习学习吧
  • java导出excel需要的jar包 SXSSFWorkbook等
  • java导出Excel文件

    2017-11-09 16:15:48
    java导出Excel文件
  • java导出Excel合并单元格

    万次阅读 多人点赞 2017-10-22 11:43:03
    网上java导出excel表格并合并单元格的资料不完全,我整理了一份,并亲测能用,附截图。 ①java导出excel用到POI所有jar包,大家可以直接到下面地址下载点击打开链接 ②模拟数据类 package org; public class ...
  • 主要介绍了java导出Excel通用方法的实例详解的相关资料,需要的朋友可以参考下
  • java解决导出Excel时文件名乱码的方法示例:(推荐:java视频教程)String agent = request.getHeader("USER-AGENT").toLowerCase();response.setContentType("application/vnd.ms-excel");String fileName = "文件名...
  • Java导出Excel合并单元格

    千次阅读 2019-02-07 13:56:11
    Java导出Excel合并单元格
  • java导出excel插入图片

    2019-04-23 14:23:13
    java导出excel插入图片
  • java导出Excel 时候 相同行合并(可合并多列); 已测试通过;
  • java导出excel POI jar包

    2016-05-24 11:09:47
    java导出excel POI jar包 java代码地址http://blog.csdn.net/awenluck/article/details/51488537

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