java定時(shí)器timer的使用方法代碼示例

<!-- 用于補(bǔ)償認(rèn)證信息異常的數(shù)據(jù)，用來(lái)啟動(dòng)定時(shí)器，20170505 -->
<listener>
  <listener-class>com.dcits.app.servlet.MyTimerTaskListener</listener-class>
</listener>

package com.dcits.app.servlet;
import java.util.Calendar;
import java.util.Timer;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
/**
 * @author Weiyongle
 * @time 2017-5-5 下午2:05:32
 */
public class MyTimerTaskListener implements ServletContextListener {
	private Timer timer = null;
	@Override
	  public void contextDestroyed(ServletContextEvent arg0) {
		timer.cancel();
	}
	@Override
	  public void contextInitialized(ServletContextEvent arg0) {
		System.out.println("-----開始啟動(dòng)定時(shí)器------");
		Calendar twentyOne = Calendar.getInstance();
		twentyOne.set(Calendar.HOUR_OF_DAY, 23);
		twentyOne.set(Calendar.MINUTE, 0);
		twentyOne.set(Calendar.SECOND, 0);
		timer = new Timer(true);
		//第一次是晚上23點(diǎn)執(zhí)行，間隔24小時(shí)執(zhí)行一次
		timer.schedule(new MyTimerTask(), twentyOne.getTime(), 1000*60*60*24);
		//*System.out.println("-----開始啟動(dòng)定時(shí)器------");
    Calendar twentyOne = Calendar.getInstance();
    twentyOne.set(Calendar.HOUR_OF_DAY, 14);
    twentyOne.set(Calendar.MINUTE, 47);
    twentyOne.set(Calendar.SECOND, 0);
    timer = new Timer(true);
    timer.schedule(new MyTimerTask(), twentyOne.getTime(), 1000*10);*/
	}
}

package com.dcits.app.servlet;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.TimerTask;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.map.JsonMappingException;
/**
 * 定時(shí)器，用于補(bǔ)償認(rèn)證的時(shí)候沒(méi)有獲取到正常返回的那些數(shù)據(jù)
 * @author Weiyongle
 * @time 2017-5-5 下午2:20:12
 */
public class MyTimerTask extends TimerTask{
	private static StringBuffer url = new StringBuffer();
	@Override
	  public void run() {
		//生產(chǎn)環(huán)境
		//    url.append("https://我是具體的ip地址/nmsypt/servlet/webServlet");//生產(chǎn)環(huán)境
		url.append("http://localhost:8080/adp/servlet/webServlet");
		//本地環(huán)境
		Map<String,Object> reqMap = new HashMap<String,Object>();
		//這里的map從數(shù)據(jù)庫(kù)里獲取對(duì)應(yīng)的數(shù)據(jù)不寫死就行了,先獲取map，在寫個(gè)for循環(huán)進(jìn)行循環(huán)就行了
		reqMap.put("QYMC","丹同學(xué)的公司");
		reqMap.put("NSRSBH","158028307441234");
		reqMap.put("SJHM_FR","15802830744");
		reqMap.put("YZM","123456");
		reqMap.put("CWFZR","");
		//
		reqMap.put("ZJLX_DM_CW","");
		//
		reqMap.put("ZJHM_CW","");
		//
		reqMap.put("ZGRS","1234");
		reqMap.put("SQYY","");
		//
		reqMap.put("JRCPBM","00002");
		reqMap.put("XYDM","1");
		reqMap.put("XZQHDM","");
		reqMap.put("QYBM","QY17900000647001");
		try {
			CompensateData.CompensateDatas(url.toString(), reqMap);
			System.out.println("-----成功補(bǔ)償了一條認(rèn)證信息------");
		}
		catch (JsonGenerationException e) {
			e.printStackTrace();
		}
		catch (JsonMappingException e) {
			e.printStackTrace();
		}
		catch (IOException e) {
			e.printStackTrace();
		}
	}
}

package com.wang.reflect;
import java.io.File;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
class MyTask extends TimerTask{
/**
 * 定時(shí)刪除指定位置的文件,(這里以刪除f盤下aa文件夾的所有文件為例)
 */
  @Override
  public void run() {
    File file=new File("f://aa");
    deleteFolder(file);
  }
  public void deleteFolder(File file){
    File[] files=file.listFiles();
    for(File f:files){
      if(f.isDirectory()){
        //使用遞歸
        deleteFolder(f);
      }else{
        f.delete();
      }
    }
    file.delete();
  }
}
public class TimerDemo {
  public static void main(String[] args) throws ParseException {
    //創(chuàng)建定時(shí)器對(duì)象
    Timer t=new Timer();
    String time="2016-04-04 11:26:40";
    Date d=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(time);
    t.schedule(new MyTask(), d);
  }
}