springboot拦截器实现强制登录

首先依赖没有特殊要求

项目结构

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springboot</artifactId>
        <groupId>com.baizhi</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>springbootfile</artifactId>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.1.13.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <version>9.0.31</version>
        </dependency>
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.3</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <version>2.1.13.RELEASE</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <!--启动插件-->
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>2.1.3.RELEASE</version>
                <configuration>
                    <fork>true</fork>
                    <jvmArguments>-Dfile.encoding=utf-8</jvmArguments>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

<html>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<body>

<form action="/springbootfile/login">
    账号: <input type="text" name="username" > <br>
    密码: <input type="password" name="password" > <br>
    <input type="submit" value="提交">
</form>
</body>
</html>

UserController

package com.baihzhi.controller;

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

import javax.servlet.http.HttpSession;

/**
 * @Package: com.baihzhi.controller
 * @ClassName: UserController
 * @Author: alex
 * @CreateTime: 2020/11/9 19:08
 * @Description:
 */
@Controller
public class UserController {
   @RequestMapping("/login")
   public String login(String username, String password, HttpSession session){
       if(username.equals("alex")&&password.equals("12345")){
           session.setAttribute("status","status");
           return "uploadsuccess";
       }
       System.out.println("1111");
       return "error";
   }
    @RequestMapping("/show")
    public String show(){
       return "uploadsuccess";
    }
}

(interceptor拦截器包)LoginInterceptor（拦截器）

package com.baihzhi.interceptor;

import org.springframework.stereotype.Component;
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;

/**
 * @Package: com.baihzhi.interceptor
 * @ClassName: LoginInterceptor
 * @Author: alex
 * @CreateTime: 2020/11/9 19:21
 * @Description:
 */
@Component //此处注解一定要写，不然会被springboot忽略，此处注解相当于bean标签
public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HttpSession session = request.getSession();
        String status =(String) session.getAttribute("status");
        System.out.println("22222");
        if(status!=null){
            System.out.println("33333");
            return true;
        }
        response.sendRedirect(request.getContextPath()+"/login.jsp");
        return false;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}

springbootApplication(入口类)

package com.baihzhi;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @Package: com.baihzhi
 * @ClassName: springbootfileApplication
 * @Author: alex
 * @CreateTime: 2020/11/9 14:07
 * @Description:
 */

@SpringBootApplication
public class springbootfileApplication {
    public static void main(String[] args) {
        SpringApplication.run(springbootfileApplication.class,args);
    }
}

SpringMVCConfig(配置拦截范围，注意和入口类在同一级别的包里面，便于扫描）

package com.baihzhi;

//import com.baihzhi.interceptor.LoginInterceptor;
//import org.springframework.beans.factory.annotation.Autowired;
//import org.springframework.context.annotation.Configuration;
//import org.springframework.web.servlet.HandlerInterceptor;
//import org.springframework.web.servlet.config.annotation.InterceptorRegistration;
//import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
//import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
//
///**
// * @Package: com.baihzhi
// * @ClassName: SpringMVCConfig
// * @Author: alex
// * @CreateTime: 2020/11/9 19:32
// * @Description:
// */
//@Configuration
//public class SpringMVCConfig implements WebMvcConfigurer {
//    @Autowired
//    private HandlerInterceptor ls;
//
//    @Override
//    public void addInterceptors(InterceptorRegistry registry) {
//        InterceptorRegistration interceptor = registry.addInterceptor(ls);
//        //设置拦截范围
//        interceptor.addPathPatterns("/**");
//        //排除拦截
//        interceptor.excludePathPatterns("/login","/register");
//    }
//}

import com.baihzhi.interceptor.LoginInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class SpringMVCConfig implements WebMvcConfigurer {
    @Autowired
    private LoginInterceptor loginInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        InterceptorRegistration ir = registry.addInterceptor(loginInterceptor);
        ir.addPathPatterns("/**");
        ir.excludePathPatterns("/login","/register");

    }
}

application.yml

server:
  port: 8989
  servlet:
    context-path: /springbootfile

spring:
  mvc:
    view:
      prefix: /
      suffix: .jsp

posted on 2020-11-09 20:58 AlexLiuF 阅读(482) 评论(0) 编辑收藏举报