SpringMVC攔截器-性能監控

一、編寫攔截器，記錄Controller方法執行時間

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.core.NamedThreadLocal;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;


/**
 * @Description:
 */
public class TimerInterceptor implements HandlerInterceptor {
	private NamedThreadLocal<Long> startTimeThreadLocal = new NamedThreadLocal<Long>("WatchExecuteTime");
	
	public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2) throws Exception {
		long beginTime = System.currentTimeMillis();			//開始時間
		startTimeThreadLocal.set(beginTime);
		return true;
	}
	
	public void afterCompletion(HttpServletRequest req, HttpServletResponse res, Object arg2, Exception arg3) throws Exception {
		long endTime = System.currentTimeMillis();
		long executeTime = endTime - startTimeThreadLocal.get();
		System.out.println(String.format("%s execute %d ms." , req.getRequestURI() , executeTime));
	}
	
	public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,
			Object arg2, ModelAndView arg3) throws Exception {
	}
}

二、在springmvc-servlet.xml文件中配置攔截器

對多個controller進行指定方法的攔截
	<mvc:interceptors>
		<mvc:interceptor>
			<mvc:mapping path="/cargo/export/list.action"/>
			<bean class="cn.itcast.jk.interceptor.TimerInterceptor"/>
		</mvc:interceptor>
		<mvc:interceptor>
			<mvc:mapping path="/cargo/packinglist/list.action"/>
			<bean class="cn.itcast.jk.interceptor.TimerInterceptor"/>
		</mvc:interceptor>
	</mvc:interceptors>


對多個controller的全部方法攔截
	<mvc:interceptors>
		<mvc:interceptor>
			<mvc:mapping path="/cargo/export/*"/>
			<bean class="cn.itcast.jk.interceptor.TimerInterceptor"/>
		</mvc:interceptor>
		<mvc:interceptor>
			<mvc:mapping path="/cargo/packinglist/*"/>
			<bean class="cn.itcast.jk.interceptor.TimerInterceptor"/>
		</mvc:interceptor>
	</mvc:interceptors>


對某目錄下的controller進行攔截

	<mvc:interceptors>
		<mvc:interceptor>
			<mvc:mapping path="/cargo/**"/>
			<bean class="cn.itcast.jk.interceptor.TimerInterceptor"/>
		</mvc:interceptor>
	</mvc:interceptors>

 攔截整個項目的全部controller

	<mvc:interceptors>
		<mvc:interceptor>
			<mvc:mapping path="/**"/>
			<bean class="cn.itcast.jk.interceptor.TimerInterceptor"/>
		</mvc:interceptor>
	</mvc:interceptors>