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

2015-11-04 10:45 483 查看

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。

2.1 web.xml。

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<?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。

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<?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。

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<%@ 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。

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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。

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。???

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