拦截器示例之日志记录

<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/**" />
<bean class="exam.njxzc.Interceptor.AllInterceptor" />
</mvc:interceptor>
</mvc:interceptors>

import java.text.SimpleDateFormat;

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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.NamedThreadLocal;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class AllInterceptor implements HandlerInterceptor{
protected Logger logger = LoggerFactory.getLogger(getClass());
//定义线程本地变量，这里的NamedThreadLocal只是1个带name属性的ThreadLocal：
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 resonse, Object handle, Exception ex)
throws Exception {
// 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 Object[]{
new SimpleDateFormat("hh:mm:ss.SSS").format(endTime), 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});
}
}

/**
* 转换为时间（天,时:分:秒.毫秒）
* @param timeMillis
* @return
*/
private static String formatDateTime(long timeMillis){
long day = timeMillis/(24*60*60*1000);
long hour = (timeMillis/(60*60*1000)-day*24);
long min = ((timeMillis/(60*1000))-day*24*60-hour*60);
long s = (timeMillis/1000-day*24*60*60-hour*60*60-min*60);
long sss = (timeMillis-day*24*60*60*1000-hour*60*60*1000-min*60*1000-s*1000);
return (day>0?day+",":"")+hour+":"+min+":"+s+"."+sss;
}
}

03:47:42,507 DEBUG [exam.njxzc.Interceptor.AllInterceptor] -开始计时: 03:47:42.506  URI: /exammanage/listrooms.do
03:47:42,939  INFO [exam.njxzc.Interceptor.AllInterceptor] -ViewName: jsonView
03:47:42,959 DEBUG [exam.njxzc.Interceptor.AllInterceptor] -计时结束：03:47:42.958  耗时：0:0:0.452  URI: /exammanage/listrooms.do  最大内存: 247m  已分配内存: 168m  已分配内存中的剩余空间: 79m  最大可用内存: 159m