springmvc 拦截器（springmvc教程六）

版权声明：随意转载。 https://blog.csdn.net/dengjili/article/details/84500700

工程代码

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

拦截器的使用

定义一个拦截器

public class MyInterceptor implements HandlerInterceptor {

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

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

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

	// 视图结束后方法
	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		logger.debug("=>{}", "afterCompletion");
	}

}

配置拦截器

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

多个拦截器的顺序

定义一个新拦截器

public class MyInterceptor2 implements HandlerInterceptor {

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

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

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

	// 视图结束后方法
	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		logger.debug("=>{}", "afterCompletion2");
	}

}

配置拦截器

<!-- 拦截器配置 -->
	<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>

输出结果

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