Spring Interceptor拦截器流程

Spring拦截器流程


 

示例 - 登陆验证

  • 编写Annotation, 用于标识不需要进行登陆验证的请求方法
    @Target(ElementType.METHOD)
    @Retention(RetentionPolicy.RUNTIME)
    public @interface LoginNotNeed {
    	
    }
    
  • 编写Interceptor
    public class LoginInterceptor extends HandlerInterceptorAdapter {
    	
    	Logger logger = LoggerFactory.getLogger(LoginInterceptor.class);
    	
    	@SuppressWarnings("unchecked")
    	@Override
    	public boolean preHandle(HttpServletRequest request,
    			HttpServletResponse response, Object handler) throws Exception {
    		
    		HandlerMethod handlerMethod = (HandlerMethod) handler;
    		Method method = handlerMethod.getMethod();
    		
    		if (method.isAnnotationPresent(LoginNotNeed.class)) {
    			return super.preHandle(request, response, handler);
    		} else {
    			HttpSession session = request.getSession();
    			Map<String, Object> loginUser = (Map<String, Object>) session.getAttribute(LoginEnum.LOGIN_USER.toString());
    			if (null == loginUser) {
    				logger.debug("user isn't logged in.");
    				request.setAttribute("msg", "LoginInterceptor - 错误提示: 用户未登录");
    				logger.debug("request.getRequestURI() = {} ", request.getRequestURI());
    				session.setAttribute(LoginEnum.LAST_REQUEST_URL_NO_LOGIN.toString(), 
    						request.getRequestURI().replaceFirst(request.getContextPath(), ""));
    				request.getRequestDispatcher("/login").forward(request, response);				
    				return false;
    			} else {
    				return super.preHandle(request, response, handler);
    			}
    		}
    		
    	}
    
    }
  • 配置interceptor
    <!-- 登陆拦截器 -->
    	<bean id="loginInterceptor"
    	    class="com.vserve.smartmedia.LoginInterceptor"></bean>
    
    <!-- 拦截器配置 -->
    	<mvc:interceptors>
    	    <mvc:interceptor>
    	        <mvc:mapping path="/**"/>
    	        <mvc:exclude-mapping path="/assets/**"/>
    	        <ref bean="loginInterceptor"/>
    	    </mvc:interceptor>
    	</mvc:interceptors>
  • 使用示例
    	/**
    	 * 跳转到登陆页面
    	 * @return
    	 */
    	@LoginNotNeed
    	@RequestMapping("/login")
    	public String toLogin() {
    		return "/login";
    	}
    
    	/**
    	 * 主页面
    	 * @param req
    	 * @return
    	 */
    	@RequestMapping("/main")
    	public String toMain(HttpServletRequest req) {		
    		return "/main";
    	}
     
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