springmvc的登录拦截器配置

登录界面
在这里插入图片描述
login.jsp

<%--
  Created by IntelliJ IDEA.
  User: zxh
  Date: 2020/1/8
  Time: 14:54
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>登录页面</title>
</head>
<body>
<form id="loginForm" action="${pageContext.request.contextPath}/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 colspan="2"><input type="submit" value="登录"></td>
        </tr>
    </table>
</form>
</body>
</html>

登录成功后页面
main.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>主页面</title>
</head>
<body>
...........主页面
</body>
</html>

登录控制器
在这里插入图片描述
LoginController.java

@Controller
public class LoginController {

    @RequestMapping("/login")
    public String login(String username, String password, HttpSession session){

        if ("zxh".equals(username) && "123".equals(password)){
            //登录成功
            //1.保存session
            session.setAttribute("username",username);
            //2.进入到主页面
            return "main";
        }
        return "login";
    }
}

登录拦截器
在这里插入图片描述
LoginInterceptor.java

package com.zxh.backoffice.interceptor;

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

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

public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //拦截
        //1.排除不需要拦截路径
        System.out.println("客户端访问资源的路径："+request.getRequestURL());
        if(request.getRequestURI().endsWith("login.do")){
            return true; //放行
        }
        //2.如果已经登录，也要放行
        if (request.getSession().getAttribute("user")!=null){
            return true;
        }
        //3.进入到登录页面
        request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request,response);
        return false;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("未返回视图前   后处理");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("返回视图前   后处理");
    }
}

在springmvc.xml中进行登录拦截器的配置，加上如下配置代码即可

  
    <!--配置登录拦截器-->
    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/**"/>   <!--拦截所有映射路径-->
            <bean class="com.zxh.backoffice.interceptor.LoginInterceptor"/>
            <!--<mvc:exclude-mapping path=""/>-->  <!--排除哪些路径-->
        </mvc:interceptor>
    </mvc:interceptors>

ZhaoHH丶

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springmvc的登录拦截器配置

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