SpringBoot图文并茂讲解登录拦截器

其实spring boot拦截器的配置方式和springMVC差不多,只有一些小的改变需要注意下就ok了,下面这篇文章主要给大家介绍了关于如何在Springboot实现登陆拦截器功能的相关资料,需要的朋友可以参考下

1.相关概念

1.实现效果

当没有输入正确的账号密码登录成功时, 除了登录页,其他页面都无法访问(静态资源要放行)

2.实现步骤

编写一个拦截器实现HandlerInterceptor接口
拦截器注册到容器中（实现WebMvcConfigurer的addInterceptors()）
指定拦截规则（注意，如果是拦截所有，静态资源也会被拦截)

2.代码实现

1.配置文件

pom.xml

  4.0.0 org.springframework.bootspring-boot-starter-parent2.7.0com.limispringboot-test20.0.1-SNAPSHOTspringboot-test2Demo project for Spring Boot 1.8  org.springframework.bootspring-boot-starter-web org.springframework.bootspring-boot-devtoolsruntimetrue org.projectlomboklomboktrue org.springframework.bootspring-boot-starter-testtest org.springframework.bootspring-boot-configuration-processortrue   org.springframework.bootspring-boot-maven-plugin   org.projectlomboklombok org.springframework.bootspring-boot-maven-plugin   org.springframework.bootspring-boot-configuration-processor

application.properties

server.port=8080

2.java代码

SpringbootTest2Application

package com.limi.springboottest2; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.ConfigurableApplicationContext; @SpringBootApplication public class SpringbootTest2Application { public static void main(String[] args) { //1、返回我们IOC容器 ConfigurableApplicationContext run = SpringApplication.run(SpringbootTest2Application.class, args); } }

LoginInterceptor

package com.limi.springboottest2.interceptor; 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 request, HttpServletResponse response, Object handler) throws Exception { System.out.println("=========LoginInterceptor preHandle=========="); HttpSession session = request.getSession(); if(session.getAttribute("username")==null) //未登录 { //未登录， 重定向到登录页 response.sendRedirect("/index");  //重定向到登录controller return false;//拦截 } return true; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System.out.println("==========LoginInterceptor postHandle=========="); } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { System.out.println("==========LoginInterceptor afterCompletion=========="); } }

WebConfig

package com.limi.springboottest2.config; import com.limi.springboottest2.interceptor.LoginInterceptor; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.InterceptorRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurer; @Configuration public class WebConfig implements WebMvcConfigurer { @Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(new LoginInterceptor())//拦截器注册到容器中 .addPathPatterns("/**")  //所有请求都被拦截包括静态资源 .excludePathPatterns("/index", "/login") //放行的网络请求, .excludePathPatterns("/view/index.html","/css/**","/images/**", "/js/**"); //放行的资源请求 } }

HelloController

package com.limi.springboottest2.controller; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.*; import org.springframework.web.servlet.ModelAndView; import javax.servlet.http.HttpSession; @Controller public class HelloController { @GetMapping("/index") public String index(){ return "/view/index.html";  //没有使用模板引擎, 所以要带上后缀 } @PostMapping("/login") public String login(HttpSession session, String username, String password){ System.out.println("username:"+username+"   password:"+password); if("andy".equals(username)&&"123456".equals(password)) { //账号密码匹配成功 session.setAttribute("username", username); return "redirect:/success"; } return "redirect:/index"; } @GetMapping("/success") public ModelAndView test1(HttpSession session){ System.out.println("======执行控制器中方法success======"); String name = (String)session.getAttribute("username"); ModelAndView mv = new ModelAndView(); mv.addObject("name", name); mv.setViewName("/view/success.html"); return mv; } }

3.前端代码

index.css

h1{
color: blueviolet;
}

index.html

  Title 请输入账号密码进行登录!
 账号
 密码

success.html

  Title登录成功!

3.运行测试

1.直接通过网址访问登录成功页面

被重定向到登录页

2.输入错误账号密码

被重定向到登录页

3.输入正确账号密码

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