SpringMVC注解版解析不同格式的JSON串

一、概述

        不同格式的JSON串传到后台来实现功能这个是我们经常要做的一件事，本篇博客就给大家介绍四种不同的JSON串传到后台后台如何用@RequestBody解析这些不同格式的JSON串的。

二、代码展示

需要引用的jar包

1.xml配置

Web.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
     <servlet>
         <servlet-name>springMVC</servlet-name>
         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
         <load-on-startup>1</load-on-startup>
     </servlet>
     <servlet-mapping>
         <servlet-name>springMVC</servlet-name>
         <url-pattern>*.spring</url-pattern>
     </servlet-mapping>
     <welcome-file-list>
         <welcome-file>index.jsp</welcome-file>
     </welcome-file-list>
 </web-app>

springMVC-servlet.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
     xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context"
     xsi:schemaLocation="
         http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
         http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context-3.0.xsd
           http://www.springframework.org/schema/mvc
         http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd">
     <context:component-scan base-package="com.gaowei.JSON" />
     <mvc:annotation-driven />


 </beans>

2.Java代码

Userinfo.java

 package com.gaowei.entity;

 public class Userinfo {
     private String username;
     private String password;
     public String getUsername() {
         return username;
     }
     public void setUsername(String username) {
         this.username = username;
     }
     public String getPassword() {
         return password;
     }
     public void setPassword(String password) {
         this.password = password;
     }
 }

Test.java

 package com.gaowei.JSON;

 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;

 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;





 import com.gaowei.entity.Userinfo;

 @Controller
 public class Test {

     @RequestMapping(value="getJSON1")
     public void getJSON1(@RequestBody Userinfo userinfo){
         System.out.println("------getJSON1---start----");
         System.out.println(userinfo.getUsername());
         System.out.println(userinfo.getPassword());
         System.out.println("------getJSON1---end----");
     }

     @RequestMapping(value="getJSON2")
     public void getJSON2(@RequestBody ArrayList<String> list){
         System.out.println("------getJSON2---start----");
         for (int i = 0; i < list.size(); i++) {
             System.out.println(list.get(i));
         }
         System.out.println("------getJSON2---end----");
     }

     @RequestMapping(value="getJSON3")
     public void getJSON3(@RequestBody List<Map> list){
         System.out.println("------getJSON3---start----");
         for (int i = 0; i < list.size(); i++) {
             Map map=list.get(i);
             System.out.println(map.get("username")+" "+map.get("password"));
         }
         System.out.println("------getJSON3---end----");
     }

     @RequestMapping(value="getJSON4")
     public void getJSON4(@RequestBody Map map){
         System.out.println("------getJSON4---start----");
         System.out.println(map.get("username"));
         List<Map> workList=(List)map.get("work");
         for (int i = 0; i < workList.size(); i++) {
             Map eachAddressMap=workList.get(i);
             System.out.println("address="+eachAddressMap.get("address"));
         }
         Map schoolMap=(Map)map.get("school");
         System.out.println(schoolMap.get("name"));
         System.out.println(schoolMap.get("address"));
         System.out.println("------getJSON4---end----");
     }
 }

3.界面代码

Test.jsp

 <%@ page language="java" import="java.util.*" pageEncoding="utf-8" %>
  <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 <html>
     <head>
         <script src="jquery-1.3.2.js">
         </script>
         <script src="json2.js">
         </script>
         <script>
             function userinfo(username, password){
                 this.username = username;
                 this.password = password;
             }

             function sendAjax1(){
                 var userinfoRef = new userinfo('中国', '中国人');
                 var jsonStringRef = JSON.stringify(userinfoRef);
                 $.ajax({
                     type: "POST",
                     data: jsonStringRef,
                     url: "getJSON1.spring?t=" + new Date().getTime(),
                     contentType: "application/json"
                 });
             }

             function sendAjax2(){
                 var myArray =new Array();
                 myArray[0]="中国1";
                 myArray[1]="中国2";
                 myArray[2]="中国3";
                 myArray[3]="中国4";
                 var jsonString=JSON.stringify(myArray);
                   $.ajax({
                         type: "POST",
                         data: jsonString,
                         url: "getJSON2.spring?t=" + new Date().getTime(),
                         contentType: "application/json"
                     });
                 }


             function sendAjax3(){
                     var myArray=new Array();
                     myArray[0]= new userinfo('中国1', '中国人1');
                     myArray[1]= new userinfo('中国2', '中国人2');
                     myArray[2]= new userinfo('中国3', '中国人3');
                     myArray[3]= new userinfo('中国4', '中国人4');
                     var jsonString=JSON.stringify(myArray);
                       $.ajax({
                             type: "POST",
                             data: jsonString,
                             url: "getJSON3.spring?t=" + new Date().getTime(),
                             contentType: "application/json"
                         });
                 }

             function sendAjax4(){
                 var jsonObject={
                     "username":"accp",
                     "work":[{
                         "address":"address1"
                         },{
                         "address":"address2"
                             }],
                         "school":{
                             "name":"tc",
                             "address":"pjy"
                             }
                         }
                 var jsonString=JSON.stringify(jsonObject);
                   $.ajax({
                         type: "POST",
                         data: jsonString,
                         url: "getJSON4.spring?t=" + new Date().getTime(),
                         contentType: "application/json"
                     });
             }
         </script>
     </head>
     <body>
         <input type="button" onclick="sendAjax1()" value="sendAjax1"/>
         <br/>
         <input type="button" onclick="sendAjax2()" value="sendAjax2">
         <br/>
         <input type="button" onclick="sendAjax3()" value="sendAjax3">
         <br/>
         <input type="button" onclick="sendAjax4()" value="sendAjax4">
         <br/>
     </body>
 </html>

4.效果图

三、总结。

        这里要注意jar包的引用不要把spring的所有jar包都引用了会引起jar包冲突而导致报HTTP 415的错误。@RequestBody这个方法很强大可以把JSON串转化为实体类、ArryList、Map等对象。这样的方法让我们开发人员开发效率大大的提高了