SpringMVC拦截器-性能监控

开发步骤：
1、编写拦截器，记录Controller方法执行时间

package cn.itcast.jk.interceptor;

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:
 * @Author: nutony
 * @Company: http://java.itcast.cn
 * @CreateDate: 2014-3-6
 */
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（spring-mvc.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="/**"/>

//TimerInterceptor的路径
   <bean class="cn.itcast.jk.interceptor.TimerInterceptor"/>
  </mvc:interceptor>
 </mvc:interceptors>