springmvc学习(五)：session

最新推荐文章于 2025-09-23 14:00:00 发布

原创最新推荐文章于 2025-09-23 14:00:00 发布 · 161 阅读

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本文介绍了一个使用Spring MVC实现的简单示例，通过控制器处理不同的请求，并利用HTTP会话来记录用户的访问次数。此外，还展示了如何配置web.xml以解决中文输入问题，并修改jsp表单为POST方法。

一、修改控制器

新增方法check处理session

package controller;

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;
//包不要导错了
import org.springframework.web.servlet.ModelAndView;

//表示这是一个控制器
@Controller
public class HelloController {
    //表示/hello会映射到该方法上
    @RequestMapping("/hello")
    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
        ModelAndView mav = new ModelAndView("hello");
        mav.addObject("helloMessage","Hello World!");
        return mav;
    }

    @RequestMapping("/jump")
    public ModelAndView jump() {
        ModelAndView mav = new ModelAndView("redirect:/hello");
        return mav;
    }   

    @RequestMapping("/check")
    public ModelAndView check(HttpSession session) {
        Integer i = (Integer) session.getAttribute("count");
        if(i!=null) {
            i++;
        }else {
            i=1;
        }
        session.setAttribute("count", i);
        ModelAndView mav = new ModelAndView("check");
        return mav;
    }  
}

二、添加jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" isELIgnored="false"%>

session中记录的访问次数：${count}

三、解决中文输入问题

1、修改web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.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>/</url-pattern>
    </servlet-mapping>
    <filter> 
        <filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name> 
        <url-pattern>/*</url-pattern> 
    </filter-mapping>    
</web-app>

2、修改jsp表单

改为post方法

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" import="java.util.*" isELIgnored="false"%>

<form action="addProduct" method="post">

    产品名称 ：<input type="text" name="name" value=""><br />
    产品价格： <input type="text" name="price" value=""><br />

    <input type="submit" value="增加商品">
</form>