一、工具

（1）GSON
Google Gson是一个简单的基于Java的库，用于将Java对象序列化为JSON，反之亦然。 它是由Google开发的一个开源库。
以下几点说明为什么应该使用这个库 -
  • 标准化 - Gson是一个由Google管理的标准化库。
  • 高效 - 这是对Java标准库的可靠，快速和高效的扩展。
  • 优化 - Gson库经过高度优化。
  • 支持泛型 - 它为泛型提供了广泛的支持。
  • 支持复杂的内部类 - 它支持具有深度继承层次结构的复杂对象。
（2）OGNL表达式
OGNL表达式是Object-Graph Navigation Language的缩写，是一种功能强大的表达式语言，通过
简单一致的表达式语法，可以存取对象的任意属性，调用对象的方法，遍历整个对象的结构图，实现字段类型转换。
二、mavan所需引入的依赖
<dependency>

  <groupId>ognl</groupId>

  <artifactId>ognl</artifactId>

  <version>3.1.1</version>

</dependency>

<dependency>

  <groupId>com.google.code.gson</groupId> 
  <artifactId>gson</artifactId>

  <version>2.9.0</version>

</dependency>

<dependency>

  <groupId>junit</groupId>

  <artifactId>junit</artifactId>

  <version>4.13.2</version>

</dependency>

三、工具类

public class JsonUtils { 

/**

* 将指定JSON转为Map对象，Key固定为String，对应JSONkey

* Value分情况：

* 1. Value是字符串，自动转为字符串,例如:{"a","b"} 6 * 2. Value是其他JSON对象，自动转为Map，例如：{"a":{"b":"2"}}}

* 3. Value是数组，自动转为List<Map>，例如：{"a":[{"b":"2"},"c":"3"]}

* @param json 输入的JSON对象

* @return 动态的Map集合

*/

public static Map<String,Object> transferToMap(String json) {

    Gson gson = new Gson();

    Map<String, Object> map = gson.fromJson(json,

    new TypeToken<Map<String, Object>>() {}.getType());

    return map;

}

/**

* 简化方法

* @param json 原始的JSON数据

* @param path OGNL规则表达式

* @param clazz Value对应的目标类

* @return clazz对应数据

*/

public static <T> T getValue(String json, String path, Class<T> clazz) {

  try {

    Map map = transferToMap(json);

    OgnlContext context = new OgnlContext();

    context.setRoot(map);

    T value = (T) Ognl.getValue(path, context, context.getRoot());

     return value;

    } catch (Exception e) {

     throw new RuntimeException(e);

   }

}

public static <T> T getValueFromMap(Map map, String path, Class<T> clazz) {

  try {

   OgnlContext context = new OgnlContext();

    context.setRoot(map);

    T value = (T) Ognl.getValue(path, context, context.getRoot());

     return value;

    } catch (Exception e) {

     throw new RuntimeException(e);

   }

  }

 }

四、测试用例

import com.itlaoqi.JsonUtils;
import org.junit.Test;
import java.util.List;
import java.util.Map;
public class JsonCase {
/**
* {
* "a": {
* "b": {
* "c": {
* "d": {
* "e": "nothing"
* }
* }
* }
* }
* }
*/
/**
* 超多层级JSON嵌套的快速提取
*/
@Test
public void case0(){
String text = "{\n" +
" \"a\": {\n" +
" \"b\": {\n" +
" \"c\": {\n" +
" \"d\": {\n" +
" \"e\": \"nothing\"\n" +
" }\n" +
" }\n" +
" }\n" +
" }\n" +
"}";
Map<String, Object> jsonMap = JsonUtils.transferToMap(json);
String e = JsonUtils.getValue(text, "a.b.c.d.e", String.class);
System.out.println(e);
}

/**
* {
* "showapi_res_error": "",
* "showapi_res_id": "628cc9850de3769f06edbb49",
* "showapi_res_code": 0,
* "showapi_fee_num": 1,
* "showapi_res_body": {"ret_code":0,"area":"南 安","areaid":"101230506","areaCode":"350583","hourList":
[{"weather_code":"07","time":"202205242000","area":"南安","wind_direction":"东南
风","wind_power":"0-3级 微风 <5.4m/s","weather":"小 雨","areaid":"101230506","temperature":"20"},
{"weather_code":"07","time":"202205242100","area":"南安","wind_direction":"东 风","wind_power":"0-3级 微风 <5.4m/s","weather":"小 雨","areaid":"101230506","temperature":"20"},
{"weather_code":"07","time":"202205242200","area":"南安","wind_direction":"东 风","wind_power":"0-3级 微风 <5.4m/s","weather":"小 雨","areaid":"101230506","temperature":"20"},
{"weather_code":"07","time":"202205242300","area":"南安","wind_direction":"东 风","wind_power":"0-3级 微风 <5.4m/s","weather":"小 雨","areaid":"101230506","temperature":"20"},
{"weather_code":"07","time":"202205250000","area":"南安","wind_direction":"南 风","wind_power":"0-3级 微风 <5.4m/s","weather":"小 雨","areaid":"101230506","temperature":"21"},
{"weather_code":"07","time":"202205250100","area":"南安","wind_direction":"西 风","wind_power":"0-3级 微风 <5.4m/s","weather":"小 雨","areaid":"101230506","temperature":"21"},
{"weather_code":"07","time":"202205250200","area":"南安","wind_direction":"西北
风","wind_power":"0-3级 微风 <5.4m/s","weather":"小 雨","areaid":"101230506","temperature":"21"},
{"weather_code":"02","time":"202205250300","area":"南安","wind_direction":"西北
风","wind_power":"0-3级 微风
<5.4m/s","weather":"阴","areaid":"101230506","temperature":"21"},
{"weather_code":"02","time":"202205250400","area":"南安","wind_direction":"西北
风","wind_power":"0-3级 微风
<5.4m/s","weather":"阴","areaid":"101230506","temperature":"21"},
{"weather_code":"02","time":"202205250500","area":"南安","wind_direction":"西 风","wind_power":"0-3级 微风
<5.4m/s","weather":"阴","areaid":"101230506","temperature":"21"},
{"weather_code":"07","time":"202205250600","area":"南安","wind_direction":"西北
风","wind_power":"0-3级 微风 <5.4m/s","weather":"小 雨","areaid":"101230506","temperature":"21"},
{"weather_code":"07","time":"202205250700","area":"南安","wind_direction":"西北
风","wind_power":"0-3级 微风 <5.4m/s","weather":"小 雨","areaid":"101230506","temperature":"21"},
{"weather_code":"07","time":"202205250800","area":"南安","wind_direction":"西北
风","wind_power":"0-3级 微风 <5.4m/s","weather":"小 雨","areaid":"101230506","temperature":"21"},
{"weather_code":"07","time":"202205250900","area":"南安","wind_direction":"西南
风","wind_power":"0-3级 微风 <5.4m/s","weather":"小 雨","areaid":"101230506","temperature":"22"},
{"weather_code":"07","time":"202205251000","area":"南安","wind_direction":"南 风","wind_power":"0-3级 微风 <5.4m/s","weather":"小 雨","areaid":"101230506","temperature":"23"},
{"weather_code":"07","time":"202205251100","area":"南安","wind_direction":"东 风","wind_power":"0-3级 微风 <5.4m/s","weather":"小 雨","areaid":"101230506","temperature":"24"},
{"weather_code":"07","time":"202205251200","area":"南安","wind_direction":"东 风","wind_power":"0-3级 微风 <5.4m/s","weather":"小 雨","areaid":"101230506","temperature":"24"},
{"weather_code":"07","time":"202205251300","area":"南安","wind_direction":"东 风","wind_power":"0-3级 微风 <5.4m/s","weather":"小 雨","areaid":"101230506","temperature":"25"},
{"weather_code":"07","time":"202205251400","area":"南安","wind_direction":"东南
风","wind_power":"0-3级 微风 <5.4m/s","weather":"小 雨","areaid":"101230506","temperature":"25"},
{"weather_code":"07","time":"202205251500","area":"南安","wind_direction":"东南
风","wind_power":"0-3级 微风 <5.4m/s","weather":"小 雨","areaid":"101230506","temperature":"25"},
{"weather_code":"07","time":"202205251600","area":"南安","wind_direction":"东南
风","wind_power":"0-3级 微风 <5.4m/s","weather":"小 雨","areaid":"101230506","temperature":"24"},
{"weather_code":"07","time":"202205251700","area":"南安","wind_direction":"东南
风","wind_power":"0-3级 微风 <5.4m/s","weather":"小 雨","areaid":"101230506","temperature":"23"},
{"weather_code":"07","time":"202205251800","area":"南安","wind_direction":"东南
风","wind_power":"0-3级 微风 <5.4m/s","weather":"小 雨","areaid":"101230506","temperature":"23"},
{"weather_code":"07","time":"202205251900","area":"南安","wind_direction":"东南
风","wind_power":"0-3级 微风 <5.4m/s","weather":"小 雨","areaid":"101230506","temperature":"23"}]}
* }
*/
private String json = "{\n" +
"\"showapi_res_error\": \"\",\n" +
"\"showapi_res_id\": \"628cc9850de3769f06edbb49\",\n" +
"\"showapi_res_code\": 0,\n" +
"\"showapi_fee_num\": 1,\n" +
"\"showapi_res_body\": {\"ret_code\":0,\"area\":\"南安
\",\"areaid\":\"101230506\",\"areaCode\":\"350583\",\"hourList\":
[{\"weather_code\":\"07\",\"time\":\"202205242000\",\"area\":\"南安
\",\"wind_direction\":\"东南风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"小雨
\",\"areaid\":\"101230506\",\"temperature\":\"20\"},
{\"weather_code\":\"07\",\"time\":\"202205242100\",\"area\":\"南安
\",\"wind_direction\":\"东风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"小雨
\",\"areaid\":\"101230506\",\"temperature\":\"20\"},
{\"weather_code\":\"07\",\"time\":\"202205242200\",\"area\":\"南安
\",\"wind_direction\":\"东风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"小雨
\",\"areaid\":\"101230506\",\"temperature\":\"20\"},
{\"weather_code\":\"07\",\"time\":\"202205242300\",\"area\":\"南安
\",\"wind_direction\":\"东风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"小雨
\",\"areaid\":\"101230506\",\"temperature\":\"20\"},
{\"weather_code\":\"07\",\"time\":\"202205250000\",\"area\":\"南安
\",\"wind_direction\":\"南风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"小雨
\",\"areaid\":\"101230506\",\"temperature\":\"21\"},
{\"weather_code\":\"07\",\"time\":\"202205250100\",\"area\":\"南安
\",\"wind_direction\":\"西风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"小雨
\",\"areaid\":\"101230506\",\"temperature\":\"21\"},
{\"weather_code\":\"07\",\"time\":\"202205250200\",\"area\":\"南安
\",\"wind_direction\":\"西北风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"小雨
\",\"areaid\":\"101230506\",\"temperature\":\"21\"},
{\"weather_code\":\"02\",\"time\":\"202205250300\",\"area\":\"南安
\",\"wind_direction\":\"西北风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"阴
\",\"areaid\":\"101230506\",\"temperature\":\"21\"},
{\"weather_code\":\"02\",\"time\":\"202205250400\",\"area\":\"南安
\",\"wind_direction\":\"西北风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"阴
\",\"areaid\":\"101230506\",\"temperature\":\"21\"},
{\"weather_code\":\"02\",\"time\":\"202205250500\",\"area\":\"南安
\",\"wind_direction\":\"西风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"阴
\",\"areaid\":\"101230506\",\"temperature\":\"21\"},
{\"weather_code\":\"07\",\"time\":\"202205250600\",\"area\":\"南安
\",\"wind_direction\":\"西北风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"小雨
\",\"areaid\":\"101230506\",\"temperature\":\"21\"},
{\"weather_code\":\"07\",\"time\":\"202205250700\",\"area\":\"南安
\",\"wind_direction\":\"西北风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"小雨
\",\"areaid\":\"101230506\",\"temperature\":\"21\"},
{\"weather_code\":\"07\",\"time\":\"202205250800\",\"area\":\"南安
\",\"wind_direction\":\"西北风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"小雨
\",\"areaid\":\"101230506\",\"temperature\":\"21\"},
{\"weather_code\":\"07\",\"time\":\"202205250900\",\"area\":\"南安
\",\"wind_direction\":\"西南风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"小雨
\",\"areaid\":\"101230506\",\"temperature\":\"22\"},
{\"weather_code\":\"07\",\"time\":\"202205251000\",\"area\":\"南安
\",\"wind_direction\":\"南风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"小雨
\",\"areaid\":\"101230506\",\"temperature\":\"23\"},
{\"weather_code\":\"07\",\"time\":\"202205251100\",\"area\":\"南安
\",\"wind_direction\":\"东风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"小雨
\",\"areaid\":\"101230506\",\"temperature\":\"24\"},
{\"weather_code\":\"07\",\"time\":\"202205251200\",\"area\":\"南安
\",\"wind_direction\":\"东风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"小雨
\",\"areaid\":\"101230506\",\"temperature\":\"24\"},
{\"weather_code\":\"07\",\"time\":\"202205251300\",\"area\":\"南安
\",\"wind_direction\":\"东风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"小雨
\",\"areaid\":\"101230506\",\"temperature\":\"25\"},
{\"weather_code\":\"07\",\"time\":\"202205251400\",\"area\":\"南安
\",\"wind_direction\":\"东南风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"小雨
\",\"areaid\":\"101230506\",\"temperature\":\"25\"},
{\"weather_code\":\"07\",\"time\":\"202205251500\",\"area\":\"南安
\",\"wind_direction\":\"东南风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"小雨
\",\"areaid\":\"101230506\",\"temperature\":\"25\"},
{\"weather_code\":\"07\",\"time\":\"202205251600\",\"area\":\"南安
\",\"wind_direction\":\"东南风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"小雨
\",\"areaid\":\"101230506\",\"temperature\":\"24\"},
{\"weather_code\":\"07\",\"time\":\"202205251700\",\"area\":\"南安
\",\"wind_direction\":\"东南风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"小雨
\",\"areaid\":\"101230506\",\"temperature\":\"23\"},
{\"weather_code\":\"07\",\"time\":\"202205251800\",\"area\":\"南安
\",\"wind_direction\":\"东南风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"小雨
\",\"areaid\":\"101230506\",\"temperature\":\"23\"},
{\"weather_code\":\"07\",\"time\":\"202205251900\",\"area\":\"南安
\",\"wind_direction\":\"东南风\",\"wind_power\":\"0-3级 微风 <5.4m/s\",\"weather\":\"小雨
\",\"areaid\":\"101230506\",\"temperature\":\"23\"}]}\n" +
"}";

//将JSON转为标准Map结构
@Test
public void case1(){
Map<String, Object> jsonMap = JsonUtils.transferToMap(json);
System.out.println(jsonMap);
}
/**
* OGNL直接提取数据，Value为子JSON对象的情况
*/
@Test
public void case2(){
Map<String, Object> jsonMap = JsonUtils.transferToMap(json);
Map resBody = JsonUtils.getValue(json, "showapi_res_body", Map.class);
System.out.println(resBody);
}

/**
* OGNL直接提取数据，Value为标准字符串的情况
*/
@Test
public void case3(){
Map<String, Object> jsonMap = JsonUtils.transferToMap(json);
String value = JsonUtils.getValue(json, "showapi_res_body.area", String.class);
System.out.println(value);
}

/**
* OGNL直接提取数据，Value为标准字符串的情况，Value为数组的情况
*/
@Test
public void case4(){
Map<String, Object> jsonMap = JsonUtils.transferToMap(json);
List<Map> hourList = JsonUtils.getValue(json, "showapi_res_body.hourList",st.class);
System.out.println(hourList);
// 每一个集合对象都是List
for(Map hour : hourList){
System.out.println(hour);
}
}

/**
* 利用List语法获取第6个时点天气预报
*/
@Test
public void case5(){
Map<String, Object> jsonMap = JsonUtils.transferToMap(json);
String area = JsonUtils.getValue(json,"showapi_res_body.hourList[5].weather_code", String.class);
System.out.println(area);
}
}

Json多层级动态结构数据解析的更多相关文章

  1. javascript如何解析json对javascript如何解析json对象并动态赋值到select列表象并动态赋值到select列表

    原文 javascript如何解析json对象并动态赋值到select列表 JSON(JavaScriptObject Notation)一种简单的数据格式,比xml更轻巧.JSON是JavaScri ...

  2. json.net（Json.NET - Newtonsoft）利用动态类解析json字符串

    将对象转换为字符串很简单,唯一要注意的点就是为了避免循环要在需要的字段上添加jsonignore属性.可以参照这篇博文:http://www.mamicode.com/info-detail-1456 ...

  3. 纯js遍历json获取值动态为select添加option

    遍历json数组 并动态为select添加option 直接上代码,重要部分有注解 <!DOCTYPE html> <html lang="en"> < ...

  4. js中解析json对象：JSON.parse()用于从一个字符串中解析出json对象, JSON.stringify()用于从一个对象解析出字符串。

    JSON.parse()用于从一个字符串中解析出json对象. var str = '{"name":"huangxiaojian","age&quo ...

  5. javascript里面的数组，json对象，动态添加，修改，删除示例

    <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content ...

  6. JSON的简单使用_解析前台传来的JSON数据

    package cn.rocker.json; import org.junit.Test; import net.sf.json.JSONArray; import net.sf.json.JSON ...

  7. JSON数据的生成与解析

    JSON数据的生成与解析.首先先到网上下载一个json jar包,我用的是org.json 演示样例代码: package json; import org.json.JSONArray; impor ...

  8. django基础之day08，分页器从无到有，动态思路解析全过程

    *********分页器从无到有的全过程,动态思路解析如下:******** 1.通过book_queryset = models.Book.objects.all()[start_num:end_n ...

  9. Java开发笔记（一百零八）JSON串的定义和解析

    前面提到URL尾巴支持添加请求参数,具体格式形如“参数A名称=A参数值&参数B名称=B参数值”,可是这种格式只能传递简单的键值对信息,不能传递结构化数据,也无法传递数组形式的参数,因而它不适用 ...

随机推荐

  1. Hyperledger Fabric无排序组织以Raft协议启动多个Orderer服务、TLS组织运行维护Orderer服务

    前言 在实验Hyperledger Fabric无排序组织以Raft协议启动多个Orderer服务.多组织共同运行维护Orderer服务中,我们已经完成了让普通组织运行维护 Orderer 服务,但是 ...

  2. HCIE笔记-第五节-IP地址+VLSM

    192.168.1.111 -- 点分十进制 -- IPV4地址表示格式 计算机 只能识别 01010101 二进制 4组十进制数 规则:二进制0/1 在不同位表达的含义是不一致的,0永远代表不取值, ...

  3. HTTP：聊一聊HTTP中的强制缓存

    http响应response headers中会有一个cache-control,这个参数就是用来做强制缓存的 一.什么是强制缓存 强制缓存就是服务端告诉客户端某些资源(JS CSS IMG)需要按照 ...

  4. [源码解析] TensorFlow 分布式之 MirroredStrategy

    [源码解析] TensorFlow 分布式之 MirroredStrategy 目录 [源码解析] TensorFlow 分布式之 MirroredStrategy 1. 设计&思路 1.1 ...

  5. k8s入门之集群搭建(二)

    一.准备三台节点 从上篇文章 k8s入门之基础环境准备(一)安装的Ubuntu虚拟机克隆出三台虚拟机,如图所示 启动这三台虚拟机节点,分别做如下配置 虚拟机名称 IP HostName k8sMast ...

  6. 浅尝Spring注解开发_Bean生命周期及执行过程

    Spring注解开发 浅尝Spring注解开发,基于Spring 4.3.12 包含Bean生命周期.自定义初始化方法.Debug BeanPostProcessor执行过程及在Spring底层中的应 ...

  7. 手写useState与useEffect

    手写useState与useEffect useState与useEffect是驱动React hooks运行的基础,useState用于管理状态,useEffect用以处理副作用,通过手写简单的us ...

  8. 中间件漏洞之Apache

    中间件之Apache漏洞 我们常见的中间件有IIS.Apache.Nginx,其中Apache中间件有什么漏洞呢? Apache 解析漏洞: 漏洞原因:该解析漏洞属于用户配置问题(mime.types ...

  9. C# 编写一个简单易用的 Windows 截屏增强工具

    半年前我开源了 DreamScene2 一个小而快并且功能强大的 Windows 动态桌面软件.有很多的人喜欢,这使我有了继续做开源的信心.这是我的第二个开源作品 ScreenshotEx 一个简单易 ...

  10. [java并发编程]基于信号量semaphore实现限流器

    目录 一.什么是信号量 二.信号量类Semaphore 三.实现限流器 欢迎关注我的博客,更多精品知识合集 一.什么是信号量 "信号量"在编程术语中使用单词semaphore,那什 ...