SpringBoot图文并茂讲解登录拦截器-Java开发

其实springboot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

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.limi</groupId>
    <artifactId>springboot-test2</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot-test2</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
            <!-- 下面插件作用是工程打包时，不将spring-boot-configuration-processor打进包内，让其只在编码的时候有用 -->
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.springframework.boot</groupId>
                            <artifactId>spring-boot-configuration-processor</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

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

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="./css/index.css" rel="external nofollow" >
</head>
<body>
    <h1>请输入账号密码进行登录!</h1>
    <form action="login" method="post">
        账号<input type="text" name="username"><br>
        密码<input type="password" name="password"><br>
        <input type="submit" value="提交"><br>
    </form>
</body>
</html>

success.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <h1>登录成功!</h1>
</head>
<body>
</body>
</html>

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

到此这篇关于SpringBoot图文并茂讲解登录拦截器的文章就介绍到这了,更多相关SpringBoot登录拦截器内容请搜索编程学习网以前的文章希望大家以后多多支持编程学习网！

SpringBoot图文并茂讲解登录拦截器

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