SpringMVC拦截器实现登录

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

    <error-page>
        <error-code>404</error-code>
        <location>/error404.jsp</location>
    </error-page>

    <error-page>
        <error-code>500</error-code>
        <location>/error500.jsp</location>
    </error-page>

</web-app>

dispatcher-servlet.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:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="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/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!-- 在实际开发中通常都需配置 mvc:annotation-driven标签,这个标签是开启注解 -->
    <mvc:annotation-driven></mvc:annotation-driven>

    <context:component-scan base-package="com.pumpkin"/>

    <!-- 视图解析器ViewResolver -->
    <!-- 解析jsp,默认支持jstl -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property>
        <property name="prefix" value="/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <!-- 注册拦截器 -->
    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/login.do"/>
            <bean class="com.pumpkin.interceptor.LoginInterceptor"></bean>
        </mvc:interceptor>
        <mvc:interceptor>
            <mvc:mapping path="/*"/>
            <bean class="com.pumpkin.interceptor.EncodingInterceptor"></bean>
        </mvc:interceptor>
    </mvc:interceptors>
    
</beans>

index.jsp

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2017/6/18
  Time: 17:27
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>SpringMVC拦截器</title>
  </head>
  <body>
  <%
    System.out.println("===index.jsp===");
  %>
  <form action="login.do" method="post">
    用户名：<input type="text" name="username"/>
    <br/>
    密码：<input type="password" name="password"/>
    <br/>
    <input type="submit" value="提交"/>
  </form>
  </body>
</html>

success.jsp

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2017/6/17
  Time: 22:47
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>成功页面</title>
</head>
<body>
<%
    System.out.println("===success.jsp===");
%>
${username}，登陆成功！
</body>
</html>

failure.jsp

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2017/6/17
  Time: 22:47
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>失败页面</title>
</head>
<body>
<%
    System.out.println("===failure.jsp===");
%>
登录失败！
</body>
</html>

LoginController.java

package com.pumpkin.controller;

import com.pumpkin.entity.UserBean;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RequestPart;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@Controller
public class LoginController{
    @RequestMapping(value = "/login.do", method = RequestMethod.POST)
    public String login(HttpServletRequest request, HttpServletResponse response, ModelMap model){

        System.out.println("===LoginController===login===start===");

        String username = (String) request.getSession().getAttribute("username");
        String password = (String) request.getSession().getAttribute("password");

        if ("admin".equals(username) && "admin".equals(password)) {
//            UserBean user = new UserBean();
//            user.setUsername(username);
//            user.setPassword(password);
            model.addAttribute("username",username);
            return "success";
        }
        System.out.println("===LoginController===login===end===");
        return "failure";
    }
}

LoginInterceptor.java

package com.pumpkin.interceptor;

import com.pumpkin.entity.UserBean;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        System.out.println("===LoginInterceptor===preHandle===start===");
        HttpServletRequest request = (HttpServletRequest) httpServletRequest;
        HttpServletResponse response = (HttpServletResponse) httpServletResponse;

        HttpSession session = request.getSession();

        String username = request.getParameter("username");
        String password = request.getParameter("password");

        if (username != null) {
            session.setAttribute("username",username);
            session.setAttribute("password",password);
            return true;
        }
        request.getRequestDispatcher("index.jsp").forward(request,response);
        System.out.println("===LoginInterceptor===preHandle===end===");
        return false;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        System.out.println("===LoginInterceptor===postHandle===");
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        System.out.println("===LoginInterceptor===afterCompletion===");
    }
}

EncodingInterceptor.java

package com.pumpkin.interceptor;

import org.springframework.web.portlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class EncodingInterceptor implements org.springframework.web.servlet.HandlerInterceptor {
    @Override
    public boolean preHandle(javax.servlet.http.HttpServletRequest httpServletRequest, javax.servlet.http.HttpServletResponse httpServletResponse, Object o) throws Exception {
        System.out.println("===EncodingInterceptor===preHandle===atart===");
        httpServletRequest.setCharacterEncoding("UTF-8");
        System.out.println("===EncodingInterceptor===preHandle===end===");
        return true;
    }

    @Override
    public void postHandle(javax.servlet.http.HttpServletRequest httpServletRequest, javax.servlet.http.HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        System.out.println("===EncodingInterceptor===postHandle===");
    }

    @Override
    public void afterCompletion(javax.servlet.http.HttpServletRequest httpServletRequest, javax.servlet.http.HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        System.out.println("===EncodingInterceptor===afterCompletion===");
    }
}

SpringMVC拦截器实现登录

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