例子

package com.liang.test;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.TypeReference;
import java.util.Map;

public class Test5 {
    public static void main(String[] args) {
        JSONObject obj = new JSONObject();
        {
            obj.put("key1", "value1");
            obj.put("key2", "value2");
            obj.put("key3", "value3");
        }
        Map<String, String> params = JSONObject.parseObject(obj.toJSONString(), new TypeReference<Map<String, String>>() {
        });
        System.out.println(params);
    }
}

结果

输出：{key3=value3, key2=value2, key1=value1}

代码块

  JSONObject obj = new JSONObject();{
            obj.put("key1", "value1");
            obj.put("key2", "value2");
            obj.put("key3", "value3");
        }
        Map<String, String> params = JSONObject.parseObject(obj.toJSONString(), new TypeReference<Map<String, String>>() {
        });
        System.out.println(params);