使用springmvc拦截器实现登录验证

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本文链接:https://blog.csdn.net/weixin_44007988/article/details/103452920

使用springmvc拦截器实现登录验证
把页面放到web-inf中,放入到web-inf中后必须通过控制器转发到页,springmvc拦截器拦截的是控制器,不能拦截jsp,通过拦截器拦截全部控制器,需要在拦截器内部放行login控制器

控制器

package com.ning.controller;
import com.ning.pojo.Users;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpSession;

@Controller
public class DemoController {
//    @RequestMapping("main")
//    public String main(){
//        return "/WEB-INF/page/main.jsp";
//    }
    //优先找最匹配的
    @RequestMapping("{page}")
    public String main(@PathVariable String page){
        System.out.println("restful");
        return page;
    }
//    @RequestMapping("login")
//    public String login(){
//        System.out.println("login");
//        return "/login.jsp";
//    }
    @RequestMapping("login")
    public String login(Users users, HttpSession session){
        if (users.getUsername().equalsIgnoreCase("admin")&&users.getPassword().equals("123")) {
            session.setAttribute("users",users);
            return "main";
        }else {
            return "redirect:/login,jsp";
        }
    }
}

拦截器

package com.ning.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 httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        Object obj = httpServletRequest.getSession().getAttribute("users");
        String uri = httpServletRequest.getRequestURI();
        if (uri.endsWith("login")) {
            return true;
        }else {
            if (obj != null) {
                return true;
            }
            httpServletResponse.sendRedirect("/springMVC07/login.jsp");
            return false;
        }
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

    }
}

springmvc.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">

    <!--扫描注解-->
    <context:component-scan base-package="com.ning.controller"/>
    <!--注解驱动-->
    <mvc:annotation-driven/>
    <!--静态资源-->
    <mvc:resources mapping="/js/**" location="/js/"/>
    <!--视图解析器-->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/page/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    <!--配置拦截器-->
    <mvc:interceptors>
        <bean class="com.ning.interceptor.loginInterceptor"/>
    </mvc:interceptors>
</beans>

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_4_0.xsd"
         version="4.0">
    <!--配置前端控制器-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <!--字符过滤器-->
    <filter>
        <filter-name>encoding</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>encoding</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

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