SpringMVC拦截器-性能监控

1、编写拦截器，记录Controller方法执行时间

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();			//开始时间
		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 {
	}
}

2、在springmvc-servlet.xml文件中配置拦截器

对多个controller进行指定方法的拦截
	<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>


对多个controller的所有方法拦截
	<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>


对某目录下的controller进行拦截

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

 拦截整个项目的所有controller

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