]]>
]]>
]]>
contextInitialized錛堬級錛氬綋Servlet瀹瑰櫒鍚姩鏃朵細鎵цcontextDestroyed錛堬級錛氬綋Servlet瀹瑰櫒鍋滄鏃朵細鎵ц
錛?錛夊湪contextInitialized錛堬級涓姞鍏ラ渶瑕佺洃鍚殑紼嬪簭錛屽茍鐢?java.util.Timer 鐨? schedule錛堬級 鏂規(guī)硶鏉ユ帶鍒剁洃鍚▼搴忔墽琛岀殑棰戠巼
DEMO錛堣繖鏄垜鐨勭洃鍚殑紼嬪簭鍘熷瀷錛?/p>
package com.company.servlet;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Timer;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import com.company.task.ClearApplicationAttributeTask;
public class TaskListener implements ServletContextListener {
private static Timer timer = null;
private static ClearApplicationAttributeTask caaTask = null;
public void contextDestroyed(ServletContextEvent arg0) {
//緇堟姝よ鏃跺櫒錛屼涪寮冩墍鏈夊綋鍓嶅凡瀹夋帓鐨勪換鍔?/span>
if(timer != null)
timer.cancel();
}
public void contextInitialized(ServletContextEvent arg0) {
caaTask = new ClearApplicationAttributeTask(arg0.getServletContext());
timer = new Timer(true);
// 瀹氫箟浠誨姟鏃墮棿錛屾瘡澶?鏃舵墽琛?/span>
GregorianCalendar now = new GregorianCalendar();
now.set(Calendar.HOUR, 0);
now.set(Calendar.MINUTE, 0);
now.set(Calendar.SECOND, 0);
timer.schedule(caaTask, now.getTime());
}
}
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Timer;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import com.company.task.ClearApplicationAttributeTask;
public class TaskListener implements ServletContextListener {
private static Timer timer = null;
private static ClearApplicationAttributeTask caaTask = null;
public void contextDestroyed(ServletContextEvent arg0) {
//緇堟姝よ鏃跺櫒錛屼涪寮冩墍鏈夊綋鍓嶅凡瀹夋帓鐨勪換鍔?/span>
if(timer != null)
timer.cancel();
}
public void contextInitialized(ServletContextEvent arg0) {
caaTask = new ClearApplicationAttributeTask(arg0.getServletContext());
timer = new Timer(true);
// 瀹氫箟浠誨姟鏃墮棿錛屾瘡澶?鏃舵墽琛?/span>
GregorianCalendar now = new GregorianCalendar();
now.set(Calendar.HOUR, 0);
now.set(Calendar.MINUTE, 0);
now.set(Calendar.SECOND, 0);
timer.schedule(caaTask, now.getTime());
}
}
package com.company.task;
import java.util.TimerTask;
import javax.servlet.ServletContext;
public class ClearApplicationAttributeTask extends TimerTask {
private ServletContext context = null;
public ClearApplicationAttributeTask(ServletContext sc)
{
this.context = sc;
}
public void run()
{
// 鍦ㄨ繖閲屽彲浠ュ仛涓浜涙兂鍋氱殑浜嬫儏錛屾瘮濡傛竻絀篴pplication涓殑灞炴?/span>
context.removeAttribute("app_name");
}
}
import java.util.TimerTask;
import javax.servlet.ServletContext;
public class ClearApplicationAttributeTask extends TimerTask {
private ServletContext context = null;
public ClearApplicationAttributeTask(ServletContext sc)
{
this.context = sc;
}
public void run()
{
// 鍦ㄨ繖閲屽彲浠ュ仛涓浜涙兂鍋氱殑浜嬫儏錛屾瘮濡傛竻絀篴pplication涓殑灞炴?/span>
context.removeAttribute("app_name");
}
}
灝嗙紪璇戝ソ鐨刢lass鏂囦歡鏀懼叆WEB-INF/classes涓紝鏈鍚庡埆蹇樿浜嗗湪Servlet瀹瑰櫒涓綋鍓峎EB搴旂敤鐨剋eb.xml涓姞鍏ョ洃鍚鍙ワ細
<listener>
<listener-class>com.company.servlet.TaskListener</listener-class>
</listener>
<listener-class>com.company.servlet.TaskListener</listener-class>
</listener>
]]>
]]>