JAVA高级教程-Json，Map，String之间的互转（11）

目录

• • 1、Map转JSON
  • 2、**Map**转String
  • 3、JSON转String
  • 4、JSON转Map
  • 5、String转JSON
  • 6、将Json格式的字符串转换为对象
  • 7、将map转换为对象
• 第二种 google
• • 总结

1、Map转JSON

  Map<String, Object> map = new HashMap<String, Object>();
        map.put("a", "a");
        map.put("b", "123");
        JSONObject json = new JSONObject(map);

2、Map转String

  Map<String, Object> map = new HashMap<>();
        map.put("a", "b");
        String s = JSONObject.toJSONString(map);

3、JSON转String

  JSONObject json = new JSONObject();
        json.put("c", "v");
        json.put("z", "123n);

        json.toJSONString();

4、JSON转Map

JSONObject json = new JSONObject();
        json.put("ccc", "321");
        json.put("bbb", "123");

        Map<String, Object> map = (Map<String, Object>)json;

5、String转JSON

 String str = "{"username":"dsad","qwewqe":"123"}";
JSONObject json = JSONObject.parseObject(str);

6、将Json格式的字符串转换为对象

import lombok.Data;

@Data
public class AlertRule {
   
    private String relation;
    private  UpperLower diffAbs;
    private  UpperLower diffPercent;
}

@Data
public class UpperLower {
   
    private BigDecimal upper;
    private  BigDecimal lower;
}

        AlertRule alertRule= JSON.parseObject("{
   \"diffAbs\":{
   \"upper\":2000,\"lower\":23000},\"diffPercent\":{
   \"upper\":2000,\"lower\":23000},\"relation\":\"OR\"}",AlertRule.class);
        System.out.println(alertRule.getDiffAbs());

7、将map转换为对象

public class Test01 {
   

    private static class Obj1 {
   
        private String School;
        private List<String> studen;

        public List<String> getStuden() {
   
            return studen;
        }

        public void setStuden(List<String> studen) {
   
            this.studen = studen;
        }

        public String getSchool() {
   
            return School;
        }

        public void setSchool(String school) {
   
            School = school;
        }

    }

    public static void main(String[] args) {
   
        Map<String,String