JSONArray类将JavaBean,List,Map转换成json字符串

Jar包

package cn.itcast.javaee.lucene.bean2json;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.junit.Test;

import net.sf.json.JSONArray;

/**
 * 第三方工具类，将JavaBean,List,Map转换成JSON文本
 * @author xuhaixing
 *
 */
public class TestJson {
  
  @Test
  public void javabean2json(){
    User user = new User(1, "哈哈", 7000);
    JSONArray jsonArray = JSONArray.fromObject(user);
    String jsonJAVA = jsonArray.toString();
    System.out.println(jsonJAVA);
    //[{"id":1,"name":"哈哈","sal":7000}]
  }
  @Test
  public void list2json(){
    List<User> userList = new ArrayList<User>();
    userList.add(new User(1, "张三", 1000));
    userList.add(new User(2, "李四", 2000));
    userList.add(new User(3, "王五", 3000));
    JSONArray jsonArray = JSONArray.fromObject(userList);
    String jsonJAVA = jsonArray.toString();
    System.out.println(jsonJAVA);
    //[{"id":1,"name":"张三","sal":1000},{"id":2,"name":"李四","sal":2000},{"id":3,"name":"王五","sal":3000}]
    
  }
  @Test
  public void map2json(){
    List<User> userList = new ArrayList<User>();
    userList.add(new User(1, "张三", 1000));
    userList.add(new User(2, "张三老婆", 2000));
    userList.add(new User(3, "张三孩子", 3000));
    Map<String, Object> map = new HashMap<String, Object>();
    map.put("total", userList.size());
    map.put("rows", userList);
    
    JSONArray jsonArray = JSONArray.fromObject(map);
    String jsonJAVA = jsonArray.toString();
    System.out.println(jsonJAVA);
    //[{"total":3,"rows":[{"id":1,"name":"张三","sal":1000},{"id":2,"name":"张三老婆","sal":2000},{"id":3,"name":"张三孩子","sal":3000}]}]
    jsonJAVA = jsonJAVA.substring(1, jsonJAVA.length()-1);
    System.out.println(jsonJAVA);
    //{"total":3,"rows":[{"id":1,"name":"张三","sal":1000},{"id":2,"name":"张三老婆","sal":2000},{"id":3,"name":"张三孩子","sal":3000}]}
  }
  
}