java 对象 json 集合 数组 互转

1、先定义一个类对象

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package com.basics;   import com.alibaba.fastjson.JSONObject;   import java.util.List; import java.util.Map;   /**  * @author admin  */ public class students {     private Integer id;     private String uname;     private String hobby;     private String dream;     private List<Map<String,String>> info;       public Integer getId() {         return id;     }       public void setId(Integer id) {         this.id = id;     }       public String getUname() {         return uname;     }       public void setUname(String uname) {         this.uname = uname;     }       public String getHobby() {         return hobby;     }       public void setHobby(String hobby) {         this.hobby = hobby;     }       public String getDream() {         return dream;     }       public void setDream(String dream) {         this.dream = dream;     }       public List<Map<String, String>> getInfo() {         return info;     }       public void setInfo(List<Map<String, String>> info) {         this.info = info;     }           @Override     public String toString(){         return "{\"id\":\""+ id+ "\",\"uname\":\""+uname+"\",\"hobby\":\""+hobby+"\",\"dream\":\""+dream+"\",\"info\":"+ JSONObject.toJSONString(info) +"}";     } }

　　

2、实例对象添加数据和转json

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package com.basics;   import net.sf.json.JSONObject;   import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map;   public class objectMap {       public static void main(String[] args){         students std = new students();         std.setId(123456);         std.setUname("ouba");         std.setHobby("rap");         std.setDream("miss");         List<Map<String,String>> info = new ArrayList<Map<String,String>>();         Map<String,String> m = new HashMap<String,String>();         m.put("名字1","欧巴");m.put("name2","哥哥");         info.add(m);           std.setInfo(info);           System.out.println(std.toString());         //对象转json //        JSONObject json = JSONObject.parseObject(std.toString()); //        //List<String> line = (List<String>) json.get("info"); //        JSONArray line = (JSONArray) json.get("info"); //        System.out.println(line.get(1));         JSONObject js = JSONObject.fromObject(std);         String st = js.toString();         System.out.println(st);     } }

　　

注意，使用JSONObject 需要导入json-lib包，下载地址：链接: https://pan.baidu.com/s/1_TJqAvrth8yO2p-a-N33JA 提取码: q182 复制这段内容后打开百度网盘手机App，操作更方便哦