转：java写的电驴下载完成关机小程序

verycd下载套路,
发现一个downloads.txt文件同步正在下载的资源信息,下载完成后自动删除里面的记录,

思路:读downloads.txt文件,利用关键字把里面的记录分割后加入list,选择监视的文件名,利用while循环的倒计时方法以文件名为关键字从list里定时搜索,如果下载完成,调用runtime类运行dos命令shutdown,执行关机.
代码如下:

import java.io.BufferedReader;    
import java.io.File;    
import java.io.FileInputStream;    
import java.io.FileNotFoundException;    
import java.io.IOException;    
import java.io.InputStreamReader;    
import java.io.UnsupportedEncodingException;    
import java.util.ArrayList;    
import java.util.Iterator;    
import java.util.List;    
import java.util.Scanner;    
  
/**   
* @author Y 2010/04/01 23:39   
*/    
public class ShutDown {    
// easyMule下downloads.txt文件的路径    
public static final String FILEPATH = “D:\\Program Files\\easyMule\\downloads.txt”;    
  
// 查找下载记录数的关键字    
public static final String KEYWORD = “ed2k://|file|”;    
  
// 刷新读入downloads.txt的时间(秒)    
int second = 5;    
  
// 下载完成后关机的延迟时间(秒)    
int times = 60;    
  
// 需要监视的文件id号    
int id;    
  
// 监视的文件名称    
String fileName;    
  
public ShutDown() {    
  System.out.println(“当前的下载文件信息为:”);    
  System.out    
    .println(“————————————————————–”);    
  showFile(readText(FILEPATH, KEYWORD));    
  System.out    
    .println(“————————————————————–”);    
  System.out.println(“要等哪个文件下载完成关闭计算机?”);    
  Scanner scan = new Scanner(System.in);    
  id = scan.nextInt() – 1;    
  fileName = (String) readText(FILEPATH, KEYWORD).get(id);    
  System.out.println(“监视的文件是:” + fileName);    
  while (countDown(second)) {    
  
   if (readText(FILEPATH, fileName).size() == 0) {    
    shutDownComputer(times);    
    System.out.println(“计算机将在” + times + “秒内关闭”);    
    System.out.println(“输入任意内容可取消关闭计算机”);    
    if (null != scan.next()) {    
     unShutDownComputer();    
    }    
    break;    
   }    
  }    
}    
  
// 利用线程休眠进行倒计时    
public boolean countDown(int second) {    
  for (int i = second; i >= 0; i–) {    
   try {    
    Thread.sleep(1000);    
    if (i == 0) {    
     return true;    
    }    
   } catch (InterruptedException e) {    
    e.printStackTrace();    
   }    
  }    
  return false;    
}    
  
  
  
// 读取文件,查找下载的条目,返回List集合    
public List readText(String filePath, String searchWord) {    
  List list = new ArrayList();    
  File file = new File(filePath);    
  InputStreamReader reader = null;    
  BufferedReader br = null;    
  try {    
   // downloads.txt文件采用Unicode编码,需要转码    
   reader = new InputStreamReader(new FileInputStream(file), “utf-16″);    
   br = new BufferedReader(reader);    
   String s1 = null;    
   while ((s1 = br.readLine()) != null) {    
    int position = s1.indexOf(searchWord);    
    if (position != -1) {    
     s1 = s1.substring(0, position).trim();    
     list.add(s1);    
  
    }    
   }    
  } catch (UnsupportedEncodingException e) {    
   e.printStackTrace();    
  } catch (FileNotFoundException e) {    
   e.printStackTrace();    
  } catch (IOException e) {    
   e.printStackTrace();    
  } finally {    
   try {    
    br.close();    
    reader.close();    
   } catch (IOException e) {    
    e.printStackTrace();    
   }    
  
  }    
  
  return list;    
  
}    
  
// 查看当前下载的记录数    
public void showFile(List list) {    
  Iterator iter = list.iterator();    
  int count = 1;    
  while (iter.hasNext()) {    
   System.out.println(count + “=>” + iter.next());    
   count++;    
  }    
}    
  
// 关闭计算机    
public void shutDownComputer(int times) {    
  Runtime run = Runtime.getRuntime();    
  try {    
   run.exec(“shutdown -s -t” + ” ” + times);    
  } catch (IOException e) {    
   e.printStackTrace();    
  }    
}    
  
// 取消关闭计算机    
public void unShutDownComputer() {    
  Runtime run = Runtime.getRuntime();    
  try {    
   run.exec(“shutdown -a”);    
  } catch (IOException e) {    
   e.printStackTrace();    
  }    
}    
  
public static void main(String[] args) {    
  new ShutDown();    
  
}    
  
}