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JSONObject的依赖


<dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.41</version> </dependency>


   //对象转json	  
	  String jsonString= JSONObject.toJSONString(putSampleParam);
  //String转json
	     String jsonString ="{\"name\":\"zss\",\"password\":\"zss112\",\"email\":\"221@qq.com\"}";  
         JSONObject json = JSONObject.fromObject(jsonString); 


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