import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class Tests{
    public static void main(String[] args) {
         String str = txt2String(new File("此处为.txt地址"));
         JSONObject jso = JSONObject.fromObject(str);
         Object object = jso.get("list");
         JSONArray arrs = JSONArray.fromObject(object);
         System.out.println(arrs.size());
         for (Object arr : arrs) {
            JSONObject obj = JSONObject.fromObject(arr);
            System.out.println(obj);
        }
    }

    //读取.txt(我是将内容放进的文本中,所以要进行读取)
    public static String txt2String(File file){
        StringBuilder result = new StringBuilder();
        try{
            BufferedReader br = new BufferedReader(new FileReader(file));//构造一个BufferedReader类来读取文件
            String s = null;
            while((s = br.readLine())!=null){//使用readLine方法，一次读一行
                result.append(System.lineSeparator()+s);
            }
            br.close();    
        }catch(Exception e){
            e.printStackTrace();
        }
        return result.toString();
    }
}

 此处是.txt内容:(前提是String字符串满足JSON格式,否则无法进行转换)

嘎嘎一顿就是操作,学废了就动动自己的发财小手给博主点个赞吧

java将String类型转换为Json格式

举例

String data= "{\"report\":"
				+ "{\"areaId\":\"1c347f51ed2d406e895e25566f829747\","
				+ "\"bidspartId\":\"ecc9d065ca0a4274a4e7c38de684a7ee\","
				+ "\"createTime\":\"2020-04-11 16:41:42\","
				+ "\"creater\":\"张允\",\"createrId\":\"226.0\",\"id\":\"541ea398729246e6894bc9c77b77cbd7\","
				+ "\"lineId\":\"8cb2625195c8485991e2d20882684aed\",\"lineLr\":\"左线\",\"reportName\":\"tffgc\","
				+ "\"reportType\":2},\"reportData\":[{\"designEle\":2222.0,\"id\":\"bbb88ce6ed6b47b286a8c33b824ca51f\","
				+ "\"measuredEle\":\"2222\",\"mileage\":2222.0,\"offsetDisName\":\"2222\",\"offsetDisValue\":2222.0,"
				+ "\"reportId\":\"541ea398729246e6894bc9c77b77cbd7\",\"sysTime\":\"2020-04-11 17:23:53\"},"
				+ "{\"designEle\":11111.0,\"id\":\"96b0a0796954470995b1b7329aa91ca6\",\"measuredEle\":\"1111111\","
				+ "\"mileage\":111111.0,\"offsetDisName\":\"111111\",\"offsetDisValue\":11111.0,"
				+ "\"reportId\":\"541ea398729246e6894bc9c77b77cbd7\",\"sysTime\":\"2020-04-11 17:23:31\"}]}";

数据格式

代码实现

		HashMap<String, Object> json = JSONObject.parseObject(data, HashMap.class);
		
		BizReportLoft bizReportLoft = JSONObject.parseObject(json.get("report").toString(), BizReportLoft.class);
		
		List<BizLoftData> ad =  JSONObject.parseArray(json.get("reportData").toString() , BizLoftData.class);