Java中Map与JSON数据之间的互相转化

package com.hanfan.test; // HANFAN自动读取PC名字，也可以写死这个名字

import com.alibaba.fastjson.JSON;

import com.alibaba.fastjson.JSONObject;

import java.util.HashMap;

import java.util.Map;

/**

  * @Author HANFAN

  * @Date 2022/4/21 16:01

  * @Version 1.0

  */

public class mapAndJsonCast {

     public static void main(String[] args) {

         /* map转化JSON字符串常用 */

         Map testMap = new HashMap<>();

         testMap.put( "str1" , "fu" );

         testMap.put( "str2" , "ck" );

         String str = JSON.toJSONString(testMap);

         System.out.println( "testMap的值：" + testMap);

//      打印的结果是：       testMap的值：{str1=fu, str2=ck}

     }

}

         /* JSON字符串转JSON对象常用*/

         String jsonStr = "{\"str3\":\"zhangsan\",\"str4\":\"lisi\",\"str5\":\"wangwu\",\"str6\":\"maliu\"}" ;

         JSONObject jsonObject = JSONObject.parseObject(jsonStr);

         System.out.println( "jsonObject：" + jsonObject);

//      打印的结果是：       jsonObject：{"str5":"wangwu","str6":"maliu","str3":"zhangsan","str4":"lisi"}

         /*Map转JSON对象常用 */

         JSONObject JSONObj = JSONObject.parseObject(JSON.toJSONString(testMap));

         System.out.println( "JSONObj：" + JSONObj);

//      打印的结果是：        JSONObj：{"str1":"fu","str2":"ck"}

         /* JSON字符串转Map常用*/

         Map<String,Object> strMap =  JSONObject.parseObject(jsonStr);

         System.out.println( "strMap：" + strMap);

//      打印的结果是：        strMap：{"str5":"wangwu","str6":"maliu","str3":"zhangsan","str4":"lisi"}

         /*JSON对象转map常用*/

         Map<String,Object> jsonToMap =  JSONObject.parseObject(jsonObject.toJSONString());

         System.out.println( "jsonToMap：" +jsonToMap);

//      打印的结果是：        jsonToMap：{"str5":"wangwu","str6":"maliu","str3":"zhangsan","str4":"lisi"}

         //JSON对象转JSON字符串

         String jsonToStr = jsonObject.toJSONString();

         System.out.println( "jsonToStr=>" +jsonToStr);

//      打印的结果是：       jsonToStr=>{"str5":"wangwu","str6":"maliu","str3":"zhangsan","str4":"lisi"}

         /* map转化JSON字符串常用 */

         Map<String,Object> testMap = new HashMap<>();

         testMap.put( "str1" , "fu" );

         testMap.put( "str2" , "ck" );

         String str = JSON.toJSONString(testMap);

         System.out.println( "testMap的值：" + testMap);

//      打印的结果是：       testMap的值：{str1=fu, str2=ck}

         /* JSON字符串转JSON对象常用*/

         String jsonStr = "{\"str3\":\"zhangsan\",\"str4\":\"lisi\",\"str5\":\"wangwu\",\"str6\":\"maliu\"}" ;

         JSONObject jsonObject = JSONObject.parseObject(jsonStr);

         System.out.println( "jsonObject：" + jsonObject);

//      打印的结果是：       jsonObject：{"str5":"wangwu","str6":"maliu","str3":"zhangsan","str4":"lisi"}