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SpringMVC 控制器之对ServletAPI的支持与对JSON的支持

本篇两个知识点

1.SpringMVC对ServletAPI的支持

2.SpingMVC对JSON的支持

示例(用户登录,存放cookie与session)

<body>
<a href="${pageContext.request.contextPath }/user/ajax.do">测试ajax</a>

<form action="${pageContext.request.contextPath }/user/login.do" method="post"> <table> <tr> <td>用户名:</td> <td><input type="text" name="userName"/></td> </tr> <tr> <td>密码:</td> <td><input type="password" name="password"/></td> </tr> <tr> <td> <input type="submit" value="登录"/> </td> </tr> </table> </form>

 

package com.maya.controller;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.maya.model.User;

@Controller
@RequestMapping("/user")
public class UserController {
    
    @RequestMapping("/login")//SpringMVC对servletAPI的支持
    public String login(HttpServletRequest request,HttpServletResponse response,User user){//user,SpringMVC的自动封装,在上一篇中已经讲过
        Cookie c=new Cookie("user",user.getUserName()+"---"+user.getPassword());
        c.setMaxAge(1*60);//设置cookie有效时长
        HttpSession session=request.getSession();//获取session
        session.setAttribute("user", user);
        return "redirect:/student/list.do";
    }
    
    @RequestMapping("/ajax")//SpringMVC对JSON的支持
    public @ResponseBody User ajax(){
        // @ResponseBody 这个注解的作用是将User自动转换成JSON对象
        // @ResponseBody了解就可以了,通常开发时还是要用JSON.jar进行格式的转化 
        User user=new User("zhangsan","123");
        return user;
} }

 

spring-mvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    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"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd">

    <!-- 使用注解的包,包括子集 -->
    <context:component-scan base-package="com.maya"/>
    
    <!-- 注解驱动!,有了它才能用JSON的注解 --><!-- 相应的要引入mvc的命名空间 -->
    <mvc:annotation-driven/>

    <!-- 视图解析器 -->
    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/jsp/" /><!-- 返回视图到这个目录下 -->
        <property name="suffix" value=".jsp"></property>
    </bean>

</beans>

 

SpringMVC 控制器之对ServletAPI的支持与对JSON的支持