杨校老师课堂之SpringBoot整合Thymeleaf-登录拦截器

ゞ浴缸里的玫瑰 2023-01-17 11:58 185阅读 0赞

拦截

不拦截

直接访问操作页面

未登录

跳转到登录页面

D到达原定访问的页面

已登录

@Controller
    @RequestMapping("index")
    public class IndexController { 
    
        /** * 去后台首页 * @param request * @return */
        @RequestMapping("")
        public  String  toIndex(HttpServletRequest request){ 
            return "index";
        }
    }

/** *登录拦截器 */
    public class LoginInterceptor implements HandlerInterceptor{ 
        
        @Override
        public boolean preHandler(HttpServletRequest request,HttpServletResponse response,Object handler)
            	throws Exception{ 
            
            Logger log = LoggerFactory.getLogger(LoginInterceptor.class);
            
            //1. 获取请求地址
            String uri = request.getRequestUri("adminlogin");
            
            // 2. 该地址若存在 则放行
            if(uri.indexOf("adminlogin") >= 0 || uri.indexOf("login") >= 0){ 
                retrun true;
            }
            
            // 3. 获取会话对象session
            HttpSession session = request.getSession();
            
            // 4.通过会话对象session获取标记ADMIN
            User user = (User)session.setAttribute("ADMIN");
            
            // 5. 通过ADMIN获取到的User对象、进行判断是否存在
            if(user != null){ 
                //表示已登录、不再拦截
                log.info("表示已登录、不再拦截");
                return true;
            }
            
            // 6. 已拦截
            request.setAttribute("msg","尚未进行登录");
            log.info("表示未登录、已拦截");
            response.sendRedirect(request.getConetxtPath + "/adminlogin");
            return false;
        }
    }

@Controller
    public class UserController { 
        @RequestMapping("login")
        public String login(User user, HttpServletRequest request){ 
    
            User u = userService.userLogin(user);
    
            System.out.println("u=" + u);
    
            // 判断登录是不是管理员
            if (u.getType() == 1){ 
                // 确定是管理员
                request.getSession().setAttribute("ADMIN",u);
                // 重定向到IndexContrller中的index方法。进入到后台首页
                return "redirect:/index";
            }else  if (u.getType() == 0){ 
                // 确定是 普通用户
                request.getSession().setAttribute("USER",u);
                // 重定向到IndexContrller中的index/index方法。进入到前台首页
                return "redirect:/index/index";
            }else{ 
             // 确定是 普通用户
                request.setAttribute("msg","您的账户或密码有误，请检查后登录！");
                return "redirect:/adminlogin";
            }
    	}
    }

###### 配置: ######

@Configuration
    public class LoginConfig implements WebMvcConfigurer { 
        @Override
        public void addInterceptors(InterceptorRegistry registry) { 
            InterceptorRegistration registration = registry.addInterceptor(new LoginInterceptor());
    // 拦截路径: 项目下所有拦截
    registration.addPathPatterns("/**");
    // 不拦截路径: 
    registration.excludePathPatterns("/login,/**/*.html","/**/*.css","/**/*.png","/**/*.js","/**/*.jpg");
        }
    
        @Override
        public void addViewControllers(ViewControllerRegistry registry) { 
            registry.addViewController("/").setViewName("index");
            registry.addViewController("index.html").setViewName("index");
        }
    }

<!DOCTYPE html>
    <html lang="en" xmlns:th="http://www.thymeleaf.org">
    <head>
        <meta charset="UTF-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>LOGIN</title>
        <link rel="stylesheet" th:href="@{/static/component/style/components.css}" href="../static/component/style/components.css">
        <link rel="stylesheet" th:href="@{/static/css/bootstrap.css}" href="../static/css/bootstrap.css">
        <link rel="stylesheet" th:href="@{/static/css/plugins.css}" href="../static/css/plugins.css">
        <link rel="stylesheet" th:href="@{/static/css/main.css}" href="../static/css/main.css">
        <link rel="stylesheet" th:href="@{/static/css/themes.css}" href="../static/css/themes.css">
        <script th:src="@{/static/component/js/JQuery2.1.4.js}"></script>
        <script th:src="@{/static/component/plugins/layer/layer.js}"></script>
    </head>
    	<body>
    	    <div id="login">
    	        <form action="/login" method="post">
    	        <div class="center">
    	            <dl>
    	                <dt><i class="gi gi-leaf"></i>Lover's · <span> BookHouse</span></dt>
    	                <dd><span><i class="fa fa-fw fa-user"></i></span><input type="text" name="usercode" placeholder="请输入账号"></dd>
    	                <dd><span><i class="fa fa-fw fa-lock"></i></span><input type="password" name="password" placeholder="请输入密码"></dd>
    	                <dd><button type="submit">登录</button></dd>
    	            </dl>
    	        </div>
    	   	 </form>
    	    </div>
    	</body>
    </html>