目錄

• 工程程式碼
• 攔截器的使用
• 多個攔截器的順序

工程程式碼

github: https://github.com/dengjili/springmvc

攔截器的使用

定義一個攔截器

public class MyInterceptor implements HandlerInterceptor {

	private static final Logger logger = LoggerFactory.getLogger(MyController.class);

	// 前置方法  若返回false，則直接結束
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		logger.debug("=>{}", "preHandle");
		return true;
	}

	// 後置方法
	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		logger.debug("=>{}", "postHandle");
	}

	// 檢視結束後方法
	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		logger.debug("=>{}", "afterCompletion");
	}

}
 

配置攔截器

<!-- 攔截器配置 -->
	<mvc:interceptors>
		<mvc:interceptor>
			<mvc:mapping path="/attribute/*" />
			<bean class="priv.dengjl.interceptor.MyInterceptor" />
		</mvc:interceptor>
	</mvc:interceptors>

多個攔截器的順序

定義一個新攔截器

public class MyInterceptor2 implements HandlerInterceptor {

	private static final Logger logger = LoggerFactory.getLogger(MyController.class);

	// 前置方法  若返回false，則直接結束
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		logger.debug("=>{}", "preHandle2");
		return true;
	}

	// 後置方法
	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		logger.debug("=>{}", "postHandle2");
	}

	// 檢視結束後方法
	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		logger.debug("=>{}", "afterCompletion2");
	}

}

 

配置攔截器

<!-- 攔截器配置 -->
	<mvc:interceptors>
		<mvc:interceptor>
			<mvc:mapping path="/attribute/*" />
			<bean class="priv.dengjl.interceptor.MyInterceptor" />
		</mvc:interceptor>
		<mvc:interceptor>
			<mvc:mapping path="/attribute/*" />
			<bean class="priv.dengjl.interceptor.MyInterceptor2" />
		</mvc:interceptor>
	</mvc:interceptors>
 

輸出結果

=>preHandle
=>preHandle2
=>postHandle2
=>postHandle
=>afterCompletion2
=>afterCompletion