[MVC]客户端跳转/session.count

step1.客户端跳转：

1.修改IndexController：

package controller;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
 
@Controller
public class IndexController {
    @RequestMapping("/index")
    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
        ModelAndView mav = new ModelAndView("index");
        mav.addObject("message", "Hello Spring MVC");
        return mav;
    }
     
    @RequestMapping("/jump")//针对后缀/jump；
    public ModelAndView jump() {
        ModelAndView mav = new ModelAndView("redirect:/index");//客户端跳转至/index页面；
        return mav;
    }  
     
}

step2.session

1修改IndexController

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;
import org.springframework.web.servlet.ModelAndView;
 
@Controller
public class IndexController {
    @RequestMapping("/index")
    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
        ModelAndView mav = new ModelAndView("index");
        mav.addObject("message", "Hello Spring MVC");
        return mav;
    }
 
    @RequestMapping("/jump")
    public ModelAndView jump() {
        ModelAndView mav = new ModelAndView("redirect:/index");
        return mav;
    }
 
    @RequestMapping("/check")//针对后缀"/check";
    public ModelAndView check(HttpSession session) {	//创建一个session会话；
        Integer i = (Integer) session.getAttribute("count");	//读取"count"状态值；
        if (i == null)
            i = 0;
        i++;	//记录新的一次访问；
        session.setAttribute("count", i);	//状态值返回session；
        ModelAndView mav = new ModelAndView("check");	//在页面中显示count计数
        return mav;
    }
 
}

2.建立check.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}	//通过jsp展示count的计数；

step3.中文filter：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"	//配置文件实例；
    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>	//配置DispatcherServlet入口；
        <servlet-name>springmvc</servlet-name>
        <servlet-class>
            org.springframework.web.servlet.DispatcherServlet
        </servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>	//规定url格式；
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <filter> 	//通过utf-8 filter处理中文
        <filter-name>CharacterEncodingFilter</filter-name> 
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> 
        <init-param> 
            <param-name>encoding</param-name> //设定字符集；
            <param-value>utf-8</param-value> 
        </init-param> 
    </filter> 
    <filter-mapping> 
        <filter-name>CharacterEncodingFilter</filter-name> 
        <url-pattern>/*</url-pattern> 	//设定为所有访问提供filter；
    </filter-mapping>    
</web-app>

2.修改addProduct.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" import="java.util.*" isELIgnored="false"%>
 
<form action="addProduct" method="post">	//添加了method="post"传回表单数据；
 
    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>