Android实现简单的文件下载与上传

/**
 * 下载服务 IntentService 
 * 生命周期：
 * 1>当第一次启动IntentService时，Android容器
 *  将会创建IntentService对象。
 * 2>IntentService将会在工作线程中轮循消息队列，
 *  执行每个消息对象中的业务逻辑。
 * 3>如果消息队列中依然有消息，则继续执行，
 *  如果消息队列中的消息已经执行完毕，
 *  IntentService将会自动销毁，执行onDestroy方法。
 */
public class DownloadService extends IntentService{
  private static final int NOTIFICATION_ID = 100;
  public DownloadService(){
    super(\"download\");
  }
  public DownloadService(String name) {
    super(name);
  }
  /**
   * 该方法中的代码将会在工作线程中执行
   * 每当调用startService启动IntentService后，
   * IntentService将会把OnHandlerIntent中的
   * 业务逻辑放入消息队列等待执行。
   * 当工作线程轮循到该消息对象时，将会
   * 执行该方法。
   */
  protected void onHandleIntent(Intent intent) {
    //发送Http请求 执行下载业务
    //1. 获取音乐的路径
    String url=intent.getStringExtra(\"url\");
    String bit=intent.getStringExtra(\"bit\");
    String title=intent.getStringExtra(\"title\");
    //2. 构建File对象，用于保存音乐文件
    //   /mnt/sdcard/Music/_64/歌名.mp3
    File targetFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC),\"_\"+bit+\"/\"+title+\".mp3\" );         
    if(targetFile.exists()){
      Log.i(\"info\", \"音乐已存在\");
      return;
    }
    if(!targetFile.getParentFile().exists()){
      targetFile.getParentFile().mkdirs();
    }
    try {
      sendNotification(\"音乐开始下载\", \"音乐开始下载\");
      //3. 发送Http请求，获取InputStream
      InputStream is = HttpUtils.getInputStream(url);
      //4. 边读取边保存到File对象中
      FileOutputStream fos = new FileOutputStream(targetFile);
      byte[] buffer = new byte[1024*100];
      int length=0;
      int current = 0;
      int total = Integer.parseInt(intent.getStringExtra(\"total\"));
      while((length=is.read(buffer)) != -1){
        fos.write(buffer, 0, length);
        fos.flush();
        current += length;
        //通知下载的进度
        double progress = Math.floor(1000.0*current/total)/10;
        sendNotification(\"音乐开始下载\", \"下载进度：\"+progress+\"%\");
      }
      //5. 文件下载完成
      fos.close();
      cancelNotification(); //重新出现滚动消息
      sendNotification(\"音乐下载完成\", \"音乐下载完毕\");
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
  /**
   * 发通知
   */
  public void sendNotification(String ticker, String text){
    NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    Notification.Builder builder = new Notification.Builder(this);
    builder.setSmallIcon(R.drawable.ic_launcher)
      .setContentTitle(\"音乐下载\")
      .setContentText(text)
      .setTicker(ticker);
    Notification n = builder.build();
    manager.notify(NOTIFICATION_ID, n);
  }
  /**
   * 取消通知
   */
  public void cancelNotification(){
    NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    manager.cancel(NOTIFICATION_ID);
  }    
}

 /** 
   * 上传文件 
   * @param uploadFile 
   */ 
  private void uploadFile(final File uploadFile) { 
    new Thread(new Runnable() {      
      @Override 
      public void run() { 
        try { 
          uploadbar.setMax((int)uploadFile.length()); 
          String souceid = logService.getBindId(uploadFile); 
          String head = \"Content-Length=\"+ uploadFile.length() + \";filename=\"+ uploadFile.getName() + \";sourceid=\"+ 
            (souceid==null? \"\" : souceid)+\"\\r\\n\"; 
          Socket socket = new Socket(\"192.168.1.78\",7878); 
          OutputStream outStream = socket.getOutputStream(); 
          outStream.write(head.getBytes()); 
          PushbackInputStream inStream = new PushbackInputStream(socket.getInputStream());   
          String response = StreamTool.readLine(inStream); 
          String[] items = response.split(\";\"); 
          String responseid = items[0].substring(items[0].indexOf(\"=\")+1); 
          String position = items[1].substring(items[1].indexOf(\"=\")+1); 
          if(souceid==null){//代表原来没有上传过此文件，往数据库添加一条绑定记录 
            logService.save(responseid, uploadFile); 
          } 
          RandomAccessFile fileOutStream = new RandomAccessFile(uploadFile, \"r\"); 
          fileOutStream.seek(Integer.valueOf(position)); 
          byte[] buffer = new byte[1024]; 
          int len = -1; 
          int length = Integer.valueOf(position); 
          while(start&&(len = fileOutStream.read(buffer)) != -1){ 
            outStream.write(buffer, 0, len); 
            length += len; 
            Message msg = new Message(); 
            msg.getData().putInt(\"size\", length); 
            handler.sendMessage(msg); 
          } 
          fileOutStream.close(); 
          outStream.close(); 
          inStream.close(); 
          socket.close(); 
          if(length==uploadFile.length()) logService.delete(uploadFile); 
        } catch (Exception e) { 
          e.printStackTrace(); 
        } 
      } 
    }).start(); 
  } 
}