关于JSON最实用的代码（一）

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一、json在js中的应用（都是干货）

下面复制整个jsp页面：

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!DOCTYPE html><html lang="zh_CN"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>测试JSON在js中的应用</title><%pageContext.setAttribute("APP_PATH", request.getContextPath());%><script type="text/javascript" src="${APP_PATH}/static/jquery-1.12.4.min.js"></script><script type="text/javascript">$(function() {var json1 = {"name" : "tom","age" : 18};console.log("json1类型:");console.log(typeof json1);console.log("json1:" + json1);console.log("=================测试json对象转json字符串====================");//测试json对象转json字符串var jsonStr = JSON.stringify(json1);console.log("jsonStr:" + jsonStr);console.log("jsonStr类型:");console.log(typeof jsonStr);console.log("=================测试json字符串转json对象====================");//测试json字符串转json对象var jsonObject = JSON.parse(jsonStr);console.log("jsonObject类型：");console.log(typeof jsonObject);console.log("jsonObject:" + jsonObject);//测试json数组转json字符串console.log("=================测试json数组转json字符串====================");var json2 = {"name" : "jerry","age" : 19};var json3 = {"name" : "lily","age" : 20};var jsonArray = [ json1, json2, json3 ];console.log("jsonArray类型：");console.log(typeof jsonArray);var jsonArrayStr = JSON.stringify(jsonArray);console.log("jsonArrayStr数组：");console.log(typeof jsonArrayStr);console.log("jsonArrayStr:" + jsonArrayStr);//测试json字符串转json数组console.log("=================测试json字符串转json数组====================");var jsonArray2 = JSON.parse(jsonArrayStr);console.log("jsonArray2类型：");console.log(typeof jsonArray2);console.log("jsonArray2:"+jsonArray2);});</script></head><body><h1>测试JSON在js中的应用</h1></body></html>

二、json在Java代码中的应用（都是干货）

下面复制完整的类：

public class JsonArrayAndJsonObject {/** * Java对象转化为Json字符串 */@Testpublic void method1() {System.out.println("==Java对象转化为Json字符串===");Person p = new Person();p.setAge(12);p.setName("tom");JSONObject json = JSONObject.fromObject(p);// Java对象转为Json对象，然后转为Json字符串System.out.println("json类型：" + json.getClass().getSimpleName());System.out.println("json：" + json);String string = json.toString();System.out.println("string类型：" + string.getClass().getSimpleName());System.out.println("string:"+string);/*==Java对象转化为Json字符串===json类型：JSONObjectjson：{"name":"tom","age":12}string类型：Stringstring:{"name":"tom","age":12} */}/** * Java数组转换为Json字符串 */@Testpublic void method2() {System.out.println("==Java数组转换为Json字符串===");List<Person> list = new ArrayList<Person>();for (int i = 0; i < 3; i++) {Person p1 = new Person();p1.setName("jerry" + i);p1.setAge(10 + i);list.add(p1);}JSONArray jsonArr = JSONArray.fromObject(list);//java数组转jsonArray,然后转json字符串System.out.println("jsonArr类型："+jsonArr.getClass().getSimpleName());System.out.println("jsonArr："+jsonArr);String jsonStr = jsonArr.toString();System.out.println("jsonStr类型:"+jsonStr.getClass().getSimpleName());System.out.println("jsonStr:"+jsonStr);/*==Java数组转换为Json字符串===jsonArr类型：JSONArrayjsonArr：[{"name":"jerry0","age":10},{"name":"jerry1","age":11},{"name":"jerry2","age":12}]jsonStr类型:StringjsonStr:[{"name":"jerry0","age":10},{"name":"jerry1","age":11},{"name":"jerry2","age":12}] */}/** * JSON字符串转换为Java对象 */@Testpublic void method3() {System.out.println("==JSON字符串转换为Java对象===");String jsonStr = "{\"age\":15,\"name\":\"lily\"}";// String jsonStr = '{"age":15,"name":"lily"}';JSONObject jsonObj = JSONObject.fromObject(jsonStr);//JSON字符串先转换为JSON对象，再转为Java对象System.out.println("jsonObj类型："+jsonObj.getClass().getSimpleName());System.out.println("jsonObj："+jsonObj);Person p = (Person) JSONObject.toBean(jsonObj, Person.class);System.out.println("p类型："+p.getClass().getSimpleName());System.out.println("p:"+p);/* *  ==JSON字符串转换为Java对象===jsonObj类型：JSONObjectjsonObj：{"name":"lily","age":15}p类型：Personp:Person [age=15, name=lily] */}/** * JSON字符串转换为Java数组 */@SuppressWarnings("unchecked")@Testpublic void method4() {System.out.println("==JSON字符串转换为Java数组===");String jsonStrs = "[{\"age\":15,\"name\":\"lily\"},{\"age\":16,\"name\":\"lucy\"}]";JSONArray jsonArray = JSONArray.fromObject(jsonStrs);//JSON字符串先转为JSONArray对象，再转为Java数组System.out.println("jsonArray类型:"+jsonArray.getClass().getSimpleName());System.out.println("jsonArray:"+jsonArray);List<Person> personList = (List<Person>) JSONArray.toList(jsonArray, Person.class);System.out.println("personList类型："+personList.getClass().getSimpleName());System.out.println("personList：");for (Person person : personList) {System.out.println(person);}/*==JSON字符串转换为Java数组===jsonArray类型:JSONArrayjsonArray:[{"name":"lily","age":15},{"name":"lucy","age":16}]personList类型：ArrayListpersonList：Person [age=15, name=lily]Person [age=16, name=lucy] */}}

上面类用到的person类：

public class Person {private Integer age;private String name;public Person() {super();}public Person(Integer age, String name) {super();this.age = age;this.name = name;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}public String getName() {return name;}public void setName(String name) {this.name = name;}@Overridepublic String toString() {return "Person [age=" + age + ", name=" + name + "]";}}

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