菜鸟学习Spring——SpringMVC注解版在服务器端获取Json字符串并解析 · 菜鸟学SSH

## 一、概述。 SpringMVC在服务端把客户端传过来的JSON字符串，并把JSON字符串转成 JSON对象并取得其中的属性值，这个在项目中经常用到。 ## 二、代码演示。需要添加的jar包。 ![](https://box.kancloud.cn/2016-02-22_56caddfcb8134.jpg) 2.1 web.xml。 ~~~ <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1"> <filter> <filter-name>encodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>utf-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <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> ~~~ 2.2springMVC-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> ~~~ 2.3 JSP文件。 ~~~ <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> <script type="text/javascript" src="jquery-1.3.2.js"> </script> <script type="text/javascript" src="json2.js"> </script> <script type="text/javascript"> function userinfo(username,password){ this.username=username; this.password=password; } function sendAjax(){ var userinfoRef=new userinfo('高玮','12312'); var jsonStringRef=JSON.stringify(userinfoRef); $.post("getJSONString.spring?t="+new Date().getTime(),{ jsonString:jsonStringRef }); } </script> </head> <body> <input type="button" onclick="sendAjax()" value="登录" > </body> </html> ~~~ 2.4GetJSONString.java。 ~~~ package com.gaowei.JSON; import net.sf.json.JSONObject; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; @Controller public class GetJSONString { @RequestMapping(value="getJSONString") public String getJSONString(@RequestParam("jsonString") String jsonString){ JSONObject object=JSONObject.fromObject(jsonString); System.out.println(object.get("username")); System.out.println(object.get("password")); return "test.jsp"; } } ~~~ 2.5效果图。 ![](https://box.kancloud.cn/2016-02-22_56caddfcc95f5.jpg) ## 三、总结页面与Contorller层的交互避免要用到JSON传值到后台，这中方法就可以让我们更好的实现界面层与Contorller的交互。