SpringMVC-登录验证判断

​​​SpringMVC-登录验证判断​​​

​1.拦截器​

package com.kuang.config;

import org.springframework.web.servlet.HandlerInterceptor;

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

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

        HttpSession session=request.getSession();

        //登录页面要放行
        if (request.getRequestURI().contains("goLogin")){
            return true;
        }
        //提交登录
        if (request.getRequestURI().contains("login")){
            return true;
        }
        //什么情况下登录了
        if (session.getAttribute("LoginInfo")!=null){
            return true;
        }

        //判断什么情况下没有登录
        request.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(request,response);
        return false;
    }
}

​2.拦截器文件配置​

<!--拦截器配置-->
    <mvc:interceptors>
        <mvc:interceptor>
            <!--拦截该目录下的所有请求-->
            <mvc:mapping path="/**"/>
            <bean class="com.kuang.config.MyInterceptor"/>
        </mvc:interceptor>
        <mvc:interceptor>
            <mvc:mapping path="/user/**"/>
            <bean class="com.kuang.config.LoginInterceptor"/>
        </mvc:interceptor>
    </mvc:interceptors>

​3.controller​

package com.kuang.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpSession;

@Controller
@RequestMapping("/user")
public class LoginController {

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

        //将用户信息存放在session中
        session.setAttribute("LoginInfo",username);
        model.addAttribute("username",username);
       return "main";
    }

    @RequestMapping("/main")
    public  String main(){
        return "main";
    }

    @RequestMapping("/goLogin")
    public  String goLogin(){
        return "login";
    }

    //注销
    @RequestMapping("/goOut")
    public String goOut(HttpSession session){
        session.removeAttribute("LoginInfo");
        return "main";
    }
}

​4.效果​

当用户没有登录时，就进行拦截跳转到登录页面。

好了，今天的分享就到这里了。