SpringBoot拦截器实现登录拦截

我会带着你远行 2021-12-10 17:34 487阅读 0赞

*  源码

GitHub：[https://github.com/291685399/springboot-learning/tree/master/springboot-interceptor01][https_github.com_291685399_springboot-learning_tree_master_springboot-interceptor01]

*  SpringBoot拦截器可以做什么

**可以对URL路径进行拦截，可以用于权限验证、解决乱码、操作日志记录、性能监控、异常处理等**

*  SpringBoot拦截器实现登录拦截

**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">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.0.0.RELEASE</version>
            <relativePath/>
        </parent>
        <groupId>com.wyj</groupId>
        <artifactId>springboot-interceptor01</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>springboot-interceptor01</name>
        <description>springboot拦截器</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-starter-test</artifactId>
                <scope>test</scope>
            </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-thymeleaf</artifactId>
            </dependency>
        </dependencies>
    
        <build>
            <finalName>springboot-interceptor01</finalName>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    </project>

**WebMvcConfigurer**：继承WebMvcConfigurationSupport类，重写addInterceptors方法

/** * 在springboot2.0.0之后，WebMvcConfigurerAdapter已经过时了 * 会使用WebMvcConfigurer或者WebMvcConfigurationSupport替代 * * @author wyj * @create 2019-06-01 21:48 */
    @Configuration
    public class WebMvcConfigurer extends WebMvcConfigurationSupport { 
    
        /** * 在springboot2.0.0之前继承WebMvcConfigurerAdapter类，重写addInterceptors方法 * * @param registry */
    // @Override
    // public void addInterceptors(InterceptorRegistry registry) { 
    // /**
    // * 拦截器按照顺序执行,如果不同拦截器拦截存在相同的URL，前面的拦截器会执行，后面的拦截器将不执行
    // */
    // registry.addInterceptor(new AuthorityInterceptor())
    // .addPathPatterns("/user/**");
    // super.addInterceptors(registry);
    // }
    
        /**
         * 在springboot2.0.0之后实现WebMvcConfigurer接口，重写addInterceptors方法
         *
         * @param registry
         */
    // @Override
    // public void addInterceptors(InterceptorRegistry registry) { 
    // /**
    // * 拦截器按照顺序执行,如果不同拦截器拦截存在相同的URL，前面的拦截器会执行，后面的拦截器将不执行
    // */
    // registry.addInterceptor(new AuthorityInterceptor())
    // .addPathPatterns("/user/**");
    // }
    
        /**
         * 在springboot2.0.0之后继承WebMvcConfigurationSupport类，重写addInterceptors方法
         *
         * @param registry
         */
        @Override
        protected void addInterceptors(InterceptorRegistry registry) { 
            /** * 拦截器按照顺序执行,如果不同拦截器拦截存在相同的URL，前面的拦截器会执行，后面的拦截器将不执行 */
            registry.addInterceptor(new AuthorityInterceptor())
                    .addPathPatterns("/user/**");
            super.addInterceptors(registry);
        }
    }

**AuthorityInterceptor**：实现**HandlerInterceptor**接口，重写**preHandle**、**postHandle**、**afterCompletion**方法

`preHandle`：在请求处理之前进行调用（Controller方法调用之前）  
`postHandle`：请求处理之后进行调用，但是在视图被渲染之前（Controller方法调用之后）  
`afterCompletion`：在整个请求结束之后被调用，也就是在DispatcherServlet 渲染了对应的视图之后执行（主要是用于进行资源清理工作）

@Slf4j
    public class AuthorityInterceptor implements HandlerInterceptor { 
    
        private static final Set<String> NOT_INTERCEPT_URI = new HashSet<>();//不拦截的URI
    
        static { 
            NOT_INTERCEPT_URI.add("/user/login.html");
            NOT_INTERCEPT_URI.add("/user/login");
        }
    
        /** * 在请求处理之前进行调用（Controller方法调用之前） */
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
                                 Object object) throws Exception { 
            String uri = request.getRequestURI();
            if (NOT_INTERCEPT_URI.contains(uri)) { 
                log.info("不拦截" + uri);
                return true;
            }
            log.info("拦截" + uri);
            HttpSession session = request.getSession();
            UserInfo userInfo = (UserInfo) session.getAttribute("user_info_in_the_session");
            if (userInfo == null) { 
                throw new RuntimeException("用户未登陆");
            }
            return true;
        }
    
        /** * 请求处理之后进行调用，但是在视图被渲染之前（Controller方法调用之后） */
        @Override
        public void postHandle(HttpServletRequest request, HttpServletResponse response, Object object, ModelAndView mv) throws Exception { 
        }
    
        /** * 在整个请求结束之后被调用，也就是在DispatcherServlet 渲染了对应的视图之后执行 * （主要是用于进行资源清理工作） */
        @Override
        public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object object, Exception ex) throws Exception { 
        }
    }

**UserController**：

@Controller
    @RequestMapping(value = "/user")
    public class UserController { 
    
        @RequestMapping(value = "/login.html")
        public String index() { 
            return "login";
        }
    
        @RequestMapping(value = "/login")
        public String login(User user) { 
            //查询数据库，我这里直接写死
            User dbUser = new User(1, "zhangsan", "123456", "admin");
            if (dbUser.getPassword().equals(user.getPassword())) { 
                UserInfo userInfo = new UserInfo(dbUser.getId(), dbUser.getUsername(), dbUser.getRole());
                HttpSession session = getRequest().getSession();
                session.setAttribute("user_info_in_the_session", userInfo);
                return "admin";
            }
            return "login";
        }
    
        @RequestMapping(value = "/userInfo")
        @ResponseBody
        public String userInfo() { 
            HttpSession session = getRequest().getSession();
            UserInfo userInfo = (UserInfo) session.getAttribute("user_info_in_the_session");
            return userInfo.toString();
        }
    
        private HttpServletRequest getRequest() { 
            return ((ServletRequestAttributes) RequestContextHolder.currentRequestAttributes()).getRequest();
        }
    }

**User：**

@Data
    @NoArgsConstructor
    @AllArgsConstructor
    public class User implements Serializable { 
    
        private int id;
        private String username;
        private String password;
        private String role;
    
    }

**UserInfo：** 用于存在用户信息储存在session中

@Data
    @NoArgsConstructor
    @AllArgsConstructor
    public class UserInfo implements Serializable { 
    
        private int id;
        private String username; 
        private String role;
    
    }

**login.html**：只是一个很简单的登录表单

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>登陆页面</title>
    </head>
    <body>
    <form action="/user/login" method="post">
        登陆：<br/>
        用户名：<input name="username" id="username" type="text"/><br/>
        密   码：<input name="password" id="password" type="password"/><br/>
        <input type="submit" value="登陆"/>
    </form>
    </body>
    </html>

**admin.html：**

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>首页</title>
    </head>
    <body>
    <form action="/user/userInfo" method="get">
        <input type="submit" value="用户信息"/></form>
    </body>
    </html>

[https_github.com_291685399_springboot-learning_tree_master_springboot-interceptor01]: https://github.com/291685399/springboot-learning/tree/master/springboot-interceptor01