JAVA之字符串，Json，Map互相转换

柔情只为你懂 2022-12-03 08:52 165阅读 0赞

import com.alibaba.fastjson.JSON;
    import com.alibaba.fastjson.JSONObject;
    
    import java.util.HashMap;
    import java.util.Map;
    
    public class Main {
        public static void main(String[] args) {
            Map<String, String> map = new HashMap<>();
            map.put("AAA", "1");
            map.put("BBB", "2");
            map.put("CCC", "3");
            System.out.println("map=>" + map);
    
            //1.map转string
            String jsonString = JSON.toJSONString(map);
            System.out.println("mapToString=>" + jsonString);
    
            //2.map转jsonObject
            JSONObject jsonObj = JSONObject.parseObject(JSON.toJSONString(map));
            System.out.println("mapToJSON=>" + jsonObj);
    
            //3.String转jsonObject
            String jsonString2 = "{\"AAA\":\"1\",\"CCC\":\"3\",\"BBB\":\"2\"}";
            JSONObject parseObject = JSONObject.parseObject(jsonString2);
            System.out.println("StringToJson=>" + parseObject);
    
            //4.String转map
            Map stringToMap = JSONObject.parseObject(jsonString2);
            System.out.println("StringToMap=>" + stringToMap);
            String str = "{\"age\":\"24\",\"name\":\"summer\"}";
            JSONObject jsonObject = JSONObject.parseObject(str);
    
            //5.jsonObject转map
            Map jsonToMap = JSONObject.parseObject(jsonObject.toJSONString());
            System.out.println("jsonToMap=>" + jsonToMap);
    
            //6.jsonObject转String
            String jsonString3 = jsonObject.toJSONString();
            System.out.println("jsonToString=>" + jsonString3);
    
    //        输出结果：        
    //        map=>{AAA=1, CCC=3, BBB=2}
    //        mapToString=>{"AAA":"1","CCC":"3","BBB":"2"}
    //        mapToJSON=>{"AAA":"1","CCC":"3","BBB":"2"}
    //        StringToJson=>{"AAA":"1","CCC":"3","BBB":"2"}
    //        StringToMap=>{"AAA":"1","CCC":"3","BBB":"2"}
    //        jsonToMap=>{"name":"summer","age":"24"}
    //        jsonToString=>{"name":"summer","age":"24"}
        }
    }