json輸出格式化

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.serializer.SerializerFeature;

public class TestNumber {
  
    public static void main(String[] args) {
 String a="{\"name\":\"USEWAY\",\"value\":\"USEWAY\",\"blank\":\"\"}";
 
 		     System.out.println(jsonFormat(a))  ; 
    }
    public static String jsonFormat(String jsonString) {
        JSONObject object= JSONObject.parseObject(jsonString);
        jsonString = JSON.toJSONString(object, SerializerFeature.PrettyFormat, SerializerFeature.WriteMapNullValue, SerializerFeature.WriteDateUseDateFormat);
        return jsonString;
    }
    
  }

輸出結果 

{
    "blank":"",
    "name":"USEWAY",
    "value":"USEWAY"
}