java 监听器

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1、首先配置web.xml文件

<listener>
 <listener-class>cn.com.spcs.ots.common.util.OverTimeSystemListener</listener-class>
 </listener>

2、实现ServletContextListener接口

contextInitialized(final ServletContextEvent arg0)

contextDestroyed(ServletContextEvent arg0)

import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.GregorianCalendar;import java.util.Map;import java.util.Timer;import java.util.TimerTask;import javax.servlet.ServletContextEvent;import javax.servlet.ServletContextListener;import cn.com.cs.ots.bean.dao.DB2DAOImpl;import cn.com.cs.ots.bean.dao.IDAO;import cn.com.cs.ots.common.Constant;/** * 加班休假系统批处理启动 * * @author */public class OverTimeSystemListener implements ServletContextListener { private Timer timer = null; private TimerTask task = null; protected IDAO dao; private int executeCount = 0; // 月份变量 private static int month = 1; // 日期变量 private static int day = 1; // 分钟变量 private static int minute = 1; // 小时变量 private static int hour = 1; // 秒变量 private static int second = 1; /** * 加班休假系统监听方法contextInitialized * * @param arg0 * * 备注 * 作者：作成日：2008-10-22 */ public void contextInitialized(final ServletContextEvent arg0) { SysLogger.info(this, "contextInitialized is start."); timer = new Timer(); task = new TimerTask() { public void run() { try { GregorianCalendar date = new GregorianCalendar(); month = date.get(Calendar.MONTH); day = date.get(Calendar.DATE); hour = date.get(Calendar.HOUR_OF_DAY); minute = date.get(Calendar.MINUTE); second = date.get(Calendar.SECOND); // 日批处理类 EntryExitFileListener entryExitFileListener = new EntryExitFileListener(); // 月批处理类 AttendanceRecordListener attendanceRecordListener = new AttendanceRecordListener(); YearInput yearInput = new YearInput(); if ((hour == 15) && (minute == 35) && (second == 00)) { // 初始化Dao initDao(arg0); getConnection(); String start = "20081101"; String end = "20081108"; while ((end.length()) == 8) { if (start.equals(end)) { break; } entryExitFileListener.doDayBatch(dao, start, getNextDay(start)); start = getNextDay(start); } closeConnection(); } // 每日6:00调用日批处理中方法，处理下班打卡记录、门卡信息和加班记录 if ((hour == 9) && (minute == 30) && (second == 00)) { // String yesterdayDate = getYesterdayDate(); // String todayDate = getNextDay(yesterdayDate); // // // 初始化Dao // initDao(arg0); // getConnection(); // entryExitFileListener.doDayBatch(dao, yesterdayDate, // todayDate); // closeConnection(); } // 每月一日10:00启动线程，导入考勤记录 // if ((day == 1) && (hour == 10) && (minute == 0) // && (second == 1)) { // // // 初始化Dao // initDao(arg0); // getConnection(); // attendanceRecordListener.doStartTimeBatchSelect(dao); // closeConnection(); // // } // // if (executeCount == 0 // || (month == 12 && day == 30 && hour == 22 // && minute == 0 && second == 0)) { // // 初始化Dao // initDao(arg0); // getConnection(); // yearInput.getInitValue(dao, executeCount); // closeConnection(); // executeCount++; // } } catch (Exception e) { e.printStackTrace(); } finally { closeConnection(); } } }; timer.schedule(task, 10000, 500); } /** * 监听结束方法contextDestroyed * * @param arg0 * * 备注 * 作者：作成日：2008-10-22 */ public void contextDestroyed(ServletContextEvent arg0) { timer.cancel(); SysLogger.info(this, "contextInitialized is end."); } /** * 初始化dao * * @param arg * * 备注 * 作者：作成日：2008-10-22 */ private void initDao(ServletContextEvent arg) throws Exception { dao = new DB2DAOImpl(); dao.setSqlTemplateName("cn.com.cs.ots.sql.SQLTemplateImpl"); dao.setSqlMap((Map) arg.getServletContext().getAttribute( Constant.SQLTEMPLATE_KEY)); dao.setReturnTypeMap((Map) arg.getServletContext().getAttribute( Constant.RETURNTYPE_KEY)); } /** * getConnection * * * 备注 * 作者：作成日：2008-10-22 */ private void getConnection() { try { dao.getConnection(); } catch (Exception e) { e.printStackTrace(); } } /** * closeConnection * * * 备注 * 作者：作成日：2008-10-22 */ private void closeConnection() { try { if (dao != null) dao.closeConnection(); } catch (Exception e) { e.printStackTrace(); } } /** * 得到前一天的String类型 * * * @param dateTime * @return String * * 备注 * 作者：作成日：2008-10-22 */ private String getYesterdayDate() { String dateTime = null; Date pre_date = new Date(System.currentTimeMillis() - 1 * 24 * 3600 * 1000); SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd"); dateTime = formatter.format(pre_date); return dateTime; } /** * 得到下一天的String类型 * * * @param dateTime * @return String * @throws ParseException * * 备注 * 作者：作成日：2008-10-22 */ public String getNextDay(String dateTime) throws ParseException { Calendar now = Calendar.getInstance(); SimpleDateFormat simpledate = new SimpleDateFormat("yyyyMMdd"); Date date = null; date = simpledate.parse(dateTime); now.setTime(date); int year = now.get(Calendar.YEAR); int month = now.get(Calendar.MONTH); int day = now.get(Calendar.DAY_OF_MONTH) + 1; now.set(year, month, day); String time = simpledate.format(now.getTime()); return time; }}