监听，定时器

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1.web.xml 配置

<listener>
<listener-class>
tool.TimerListener
</listener-class>
</listener>

2.监听器类的配置

package tool;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.http.HttpServlet;

import jxl.common.Logger;

public class TimerListener extends HttpServlet implements ServletContextListener {
private static final long serialVersionUID = 200601509800003l;

private static Logger log = Logger.getLogger(TimerListener.class);

/**
* 初始化定时任务线程
*
* @param sce
* ServletContextEvent
*/
public void contextInitialized(ServletContextEvent sce) {
log.info("TimerListener[ServletContextListener] initializing...");
try {
BatchMain.getInstance().startTask();
} catch (Exception e) {
}
log.info("...TimerListener[ServletContextListener] initialized");
}

/**
* 销毁定时任务线程
*
* @param sce
* ServletContextEvent
*/
public void contextDestroyed(ServletContextEvent sce) {
log.info("TimerListener[ServletContextListener] destoring...");
BatchMain.getInstance().destoryTask();
log.info("...TimerListener[ServletContextListener] destoried.");
}
}
3、执行类的配置

package tool;

import java.util.Calendar;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

import jxl.common.Logger;

public class BatchMain {
private static Logger log = Logger.getLogger(BatchMain.class);

private static BatchMain instance;

// 任务调度定时器
private Timer timer;

private BatchMain() {
timer = new Timer();
}

public synchronized static BatchMain getInstance() {
if (instance == null) {
instance = new BatchMain();
}
return instance;
}

/**
* 启动指定任务线程
*
*/
public void startTask() {

Calendar calendar = Calendar.getInstance();
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH)+1;
int day = calendar.get(Calendar.DAY_OF_MONTH);
System.out.println(year+"年"+month+"月"+day+"日");
calendar.set(year, month, day, 23, 10, 00);
Date date = calendar.getTime();

Timer timer = new Timer();
System.out.println(System.currentTimeMillis());
if (date.getTime()<System.currentTimeMillis()){
System.out.println("小于当前时间"+date.getTime());
}
else{
System.out.println("大于当前时间"+date.getTime());
}
timer.schedule(new SchemeCancelTask(), 0, 24*60*60*1000);

}

/**
* 启动指定任务线程
*
*/
public void destoryTask() {
log.info("BatchMain startTask canceling...");
timer.cancel();
}
}
4；定时器任务类的配置：

package tool;

import java.util.*;

import jxl.common.Logger;

public class SchemeCancelTask extends TimerTask {

private static Logger log = Logger.getLogger(SchemeCancelTask.class);

public SchemeCancelTask() {

}

public void run() {
try {
String xn = CommonInfo.getCurrentXn();
String xq=CommonInfo.getCurrentXq();
String[] str = { "一", "二", "三", "四", "五", "六", "七", "八", "九" };
String xnxq = xn+"第"+str[Integer.parseInt(xq)-1]+"学期";
String sql = "update hp_xkshezhi set xnxq=?";
String[] params = {xnxq};

DB dao = new DB();
dao.executeUpdate(sql, params);
dao.closeConnection();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

}

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