菜鸟学习Spring——SpringMVC注解版在服务器端获取Json字符串并解析
最后更新于：2022-04-01 09:34:18
## 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。
~~~
<?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。
## 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。