java定时任务 使用java执行定时任务示例

import java.awt.Desktop;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.charset.Charset;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Timer;
import java.util.TimerTask;

public class TimerTaskTest {

 public static void main(String[] args) throws ParseException {

  Timer timer=new Timer();
  SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

  //延迟指定时间后执行任务(以毫秒为单位)
  timer.schedule(new TimerTask(){

   @Override
   public void run() {
    System.out.println("时间已经流逝1秒!!!!");
   }

  }, 1000);

  //到达指定时间后执行任务
  timer.schedule(new TimerTask(){

   @Override
   public void run() {
    try {
     //打开浏览器
     Desktop.getDesktop().browse(new URI("http://www.baidu.com/"));
    } catch (IOException | URISyntaxException e) {
     e.printStackTrace();
    }
   }

  }, sdf.parse("2014-04-20 10:20:00"));

  //延迟指定时间后以指定频率开始执行任务
  timer.schedule(new TimerTask(){

   @Override
   public void run() {
    BufferedInputStream in=null;
    BufferedReader inBr=null;
    try {
     //执行系统命令
     Process p=Runtime.getRuntime().exec("ping www.baidu.com");

     //读取输出
              in = new BufferedInputStream(p.getInputStream());
              inBr = new BufferedReader(new InputStreamReader(in,
                Charset.forName("GBK"))); //我的系统字符集为GBK 
              String lineStr=null; 
              while ((lineStr = inBr.readLine()) != null){ 
                  //获得命令执行后在控制台的输出信息
                  System.out.println(lineStr);// 打印输出信息 
              }

              //检查命令是否执行失败。 
              if (p.waitFor() != 0) { 
                  if (p.exitValue() == 1)//p.exitValue()==0表示正常结束，1：非正常结束 
                      System.err.println("命令执行失败!"); 
              }

    } catch (IOException e) {
     e.printStackTrace();
    } catch (InterruptedException e) {
     e.printStackTrace();
    } finally{
              try {
      inBr.close(); 
      in.close();
     } catch (IOException e) {
      e.printStackTrace();
     }
    }
   }

  }, 10000, 5000);

 }

}