jsonpath的使用（java：List<Object>转List<HashMap>）

阅读目录

• 要求及被测试字符串
• 依赖
• 实现

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要求及被测试字符串

练习1：从下面提取token

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1	{"code":9420, "msg":"恭喜qzcsbj，登录成功","token":"538bbaba44be5d3d3856718e6c637d02"}

格式化

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{   "code": 9420,   "msg": "恭喜qzcsbj，登录成功",   "token": "538bbaba44be5d3d3856718e6c637d02" }

　　

练习2：从下面提取username是“韧”的phone

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1	{"code":"0","msg":"sucess","data":[{"username":"韧","realname":"tester1","sex":"1","phone":"13800000001"},{"username":"全栈测试笔记","realname":"tester2","sex":"1","phone":"13800000002"}]}

格式化

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{   "code": "0",   "msg": "sucess",   "data": [     {       "username": "韧",       "realname": "tester1",       "sex": "1",       "phone": "13800000001"     },     {       "username": "全栈测试笔记",       "realname": "tester2",       "sex": "1",       "phone": "13800000002"     }   ] }

 

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依赖

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<!-- https://mvnrepository.com/artifact/com.jayway.jsonpath/json-path --> <dependency>     <groupId>com.jayway.jsonpath</groupId>     <artifactId>json-path</artifactId>     <version>2.4.0</version> </dependency>

 

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实现

获取关联值：token

获取断言字段值：code

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package com.qzcsbj;   import com.alibaba.fastjson.JSONObject; import com.jayway.jsonpath.Configuration; import com.jayway.jsonpath.JsonPath; import java.util.HashMap; import java.util.List;   /**  * @公众号 : 全栈测试笔记  * @博客 : www.cnblogs.com/uncleyong  * @微信 : ren168632201  * @描述 : <>  */ public class Test {     public static void main(String[] args) {         String res = "{\"code\":9420, \"msg\":\"恭喜qzcsbj，登录成功\",\"token\":\"538bbaba44be5d3d3856718e6c637d02\"}";         Object document = Configuration.defaultConfiguration().jsonProvider().parse(res);         String token = JsonPath.read(document, "$.token");         System.out.println("token: " + token);           String res2 = "{\"code\":\"0\",\"msg\":\"sucess\",\"data\":[{\"username\":\"韧\",\"realname\":\"tester1\",\"sex\":\"1\",\"phone\":\"13800000001\"},{\"username\":\"全栈测试笔记\",\"realname\":\"tester2\",\"sex\":\"1\",\"phone\":\"13800000002\"}]}";         Object document2 = Configuration.defaultConfiguration().jsonProvider().parse(res2);         String phone = JsonPath.read(document2, "$.data[0].phone");         System.out.println("phone: " + phone);           List<Object> arr = JsonPath.read(document2, "$.data[*].phone");  // jsonpath不能写成：$.data[*].phone[?(@.username=='韧')]         System.out.println("arr: " + arr.toString());           List<Object> arr2 = JsonPath.read(document2, "$.data[*].['username','phone']");         boolean flag = true;         System.out.println("arr2: " + arr2.toString());           List<HashMap> maps = JSONObject.parseArray(JSONObject.toJSONString(arr2),HashMap.class);  // 第一个参数也可以写为：arr2.toString()；第二个参数是字节码，说明源码用到了反射         for (HashMap map : maps) {             if ("韧".equals(map.get("username"))){                 System.out.println(map.get("username")+"的phone是：" + map.get("phone"));                 flag = false;                 break;             }         }           if (flag){             System.out.println("未获取到【韧】的phone");         }       } }

　　

 

补充：

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1	List<User> users = JSONObject.parseArray(parameters, User.class);

参考：https://www.cnblogs.com/uncleyong/p/16683578.html

 

原文会持续更新，原文地址：https://www.cnblogs.com/uncleyong/p/16676791.html