一：将系统中的这几个文件进行压缩打包：

二：将位置和名称进行写死，然后运行如下：创建类：ZipOutputStreamDemo

package com.example.test.fileUtils;

import java.io.*;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * @ClassName ZipOutputStreamDemo
 * @Author houyuanbo
 * @Date 2021/9/28 15:14
 * @Description TODO
 * @Version
 **/
public class ZipOutputStreamDemo {
  private static final Logger logger = LoggerFactory.getLogger(ZipOutputStreamDemo.class);
    public static void main(String[] args)  throws IOException {
        List list = new ArrayList();
        list.add("D:\\新建文件夹1\\"+"文档1.docx");
        list.add("D:\\新建文件夹1\\"+"文档2.docx");

        list.add("D:\\新建文件夹1\\"+"中国.txt");
        list.add("D:\\新建文件夹1\\"+"美国.txt");

        //定义压缩文件夹的名称和相关的位置
        File zipFile = new File("D:\\新建文件夹\\" + "country.zip");
 logger.info(""+zipFile);
        InputStream input = null;
        //定义压缩输出流
        ZipOutputStream zipOut = null;
        //实例化压缩输出流  并定制压缩文件的输出路径  就是D盘下【D:\新建文件夹\country.zip】的位置处
        zipOut = new ZipOutputStream(new FileOutputStream(zipFile));
        for (Object o : list) {
            File file = new File((String) o);

        //定义输入文件流
            input = new FileInputStream(file);
            zipOut.putNextEntry(new ZipEntry(file.getName()));
            //设置注释
            zipOut.setComment("www.demo.com");
            int temp = 0;
            while ((temp = input.read())!=-1){
                zipOut.write(temp);
            }
            input.close();
        }
        zipOut.close();
    }
}

         三：运行结果如下：

完成

1. 设置下载文件名编码
2. 创建zip输出流ZipOutputStream
3. 将需要下载的文件流循环写入ZipOutputStream
4. 关闭各个流

话不多说，直接上代码
service层方法（关键）：

@Override
   public void downloadAllFile(HttpServletResponse response, String processInstanceId) {
   	String downloadName = "xxx附件.zip";
   	try {
   		response.setContentType("multipart/form-data");
   		response.setHeader("Content-Disposition", "attachment;fileName=" + URLEncoder.encode(downloadName, "UTF-8"));
   	} catch (UnsupportedEncodingException e) {
   		throw new HrmsException("下载文件名编码时出现错误.", e);
   	}
   	
   	OutputStream outputStream = null;
   	ZipOutputStream zos = null;
   	try {
   		outputStream = response.getOutputStream();
   		zos = new ZipOutputStream(outputStream);
   		// 将文件流写入zip中
   		downloadTolocal(zos,processInstanceId);
   	
   	} catch (IOException e) {
   		logger.error("downloadAllFile-xxx下载全部附件失败，processInstanceId=[{}],错误信息=[{}]",processInstanceId,e);
   	}finally {
   		if(zos != null) {
   			try {
   				zos.close();
   			} catch (Exception e2) {
   				logger.info("关闭输入流时出现错误",e2);
   			}
   		}
   		if(outputStream != null) {
   			try {
   				outputStream.close();
   			} catch (Exception e2) {
   				logger.info("关闭输入流时出现错误",e2);
   			}
   		}
   		
   	}
   	
   }
   
   private void downloadTolocal(ZipOutputStream zos,String processInstanceId) throws IOException {
   	Map<String, String> pm = new HashMap<String, String>();
   	pm.put("processInstanceId", processInstanceId);
   	//获取文件信息（此处为业务代码，可根据自己的需要替换）
   	List<Map<String,String>> fileInfoList = this.findByStatement("getAllFileInfo",pm);
   	
   	for (Map<String, String> map : fileInfoList) {
   		String fileId = map.get("fileId");
   		//文件名称（带后缀）
   		String fileName = map.get("fileName");
   		InputStream is = null;
   		BufferedInputStream in = null;
   		byte[] buffer = new byte[1024];
   		int len;
   		//创建zip实体（一个文件对应一个ZipEntry）
       	ZipEntry entry = new ZipEntry(fileName);
       	try {
       	       //获取需要下载的文件流
       		is = ossFileManager.getFile(fileId);
   			in = new BufferedInputStream(is);
       		zos.putNextEntry(entry);
       		//文件流循环写入ZipOutputStream
           	while ((len = in.read(buffer)) != -1 ) {
           		zos.write(buffer, 0, len);
           		}
   		} catch (Exception e) {
   			logger.info("xxx--下载全部附件--压缩文件出错",e);
   		}finally {
   			if(entry != null) {
   				try {
   					zos.closeEntry();
   				} catch (Exception e2) {
   					logger.info("xxx下载全部附件--zip实体关闭失败",e2);
   				}
   			}
   			if(in != null) {
   				try {
   					in.close();
   				} catch (Exception e2) {
   					logger.info("xxx下载全部附件--文件输入流关闭失败",e2);
   				}
   			}
   			if(is != null) {
   				try {
   					is.close();
   				}catch (Exception e) {
   					logger.info("xxx下载全部附件--输入缓冲流关闭失败",e);
   				}
   			}
   			
   			
   		}
           	
          } 
   }

controller层接口：

	/**
    * 下载全部附件
    */
   @RequestMapping(value = "/downloadAllFile/{processInstanceId}", method = RequestMethod.GET)
   public void  downloadAllFile(HttpServletResponse response,@PathVariable("processInstanceId") String processInstanceId) {
   	floCnbCompetitionLimitService.downloadAllFile(response,processInstanceId);
   }

前端调用接口，便可在浏览器中直接下载zip文档下来