SpringMvc拦截器使用，监控每一个请求花费的时间

1：拦截器注册配置，spring-mvc.xml

   

<mvc:interceptors>
		<mvc:interceptor>
			<mvc:mapping path="${adminPath}/**" />
			<mvc:exclude-mapping path="${adminPath}/"/>
			<mvc:exclude-mapping path="${adminPath}/login"/>
			<bean class="com.thinkgem.jeesite.modules.sys.interceptor.LogInterceptor" />
		</mvc:interceptor>
	</mvc:interceptors>

2：Java代码，LogInterceptor.java

  

import java.text.SimpleDateFormat;

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;

import com.thinkgem.jeesite.common.service.BaseService;
import com.thinkgem.jeesite.common.utils.DateUtils;
import com.thinkgem.jeesite.modules.sys.utils.LogUtils;

/**
 * 日志拦截器
 * @author ThinkGem
 * @version 2014-8-19
 */
public class LogInterceptor extends BaseService implements HandlerInterceptor {

	private static final ThreadLocal<Long> startTimeThreadLocal =
			new NamedThreadLocal<Long>("ThreadLocal StartTime");
	
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, 
			Object handler) throws Exception {
		if (logger.isDebugEnabled()){
			long beginTime = System.currentTimeMillis();//1、开始时间  
	        startTimeThreadLocal.set(beginTime);		//线程绑定变量（该数据只有当前请求的线程可见）  
	        logger.debug("开始计时: {}  URI: {}", new SimpleDateFormat("hh:mm:ss.SSS")
	        	.format(beginTime), request.getRequestURI());
		}
		return true;
	}

	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, 
			ModelAndView modelAndView) throws Exception {
		if (modelAndView != null){
			logger.info("ViewName: " + modelAndView.getViewName());
		}
	}

	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, 
			Object handler, Exception ex) throws Exception {

		// 保存日志
		LogUtils.saveLog(request, handler, ex, null);
		
		// 打印JVM信息。
		if (logger.isDebugEnabled()){
			long beginTime = startTimeThreadLocal.get();//得到线程绑定的局部变量（开始时间）  
			long endTime = System.currentTimeMillis(); 	//2、结束时间  
	        logger.debug("计时结束：{}  耗时：{}  URI: {}  最大内存: {}m  已分配内存: {}m  已分配内存中的剩余空间: {}m  最大可用内存: {}m",
	        		new SimpleDateFormat("hh:mm:ss.SSS").format(endTime), DateUtils.formatDateTime(endTime - beginTime),
					request.getRequestURI(), Runtime.getRuntime().maxMemory()/1024/1024, Runtime.getRuntime().totalMemory()/1024/1024, Runtime.getRuntime().freeMemory()/1024/1024, 
					(Runtime.getRuntime().maxMemory()-Runtime.getRuntime().totalMemory()+Runtime.getRuntime().freeMemory())/1024/1024); 
		}
		
	}

}