Android大文件断点上传

源代码下载处：

http://download.csdn.net/user/zl594389970

在Android中除了通过http协议上传小文件外，还可以通过Socket上传较大的文件

案例具体思路：

文件被第一次上传时发送： "Content-Length="+ uploadFile.length() + ";filename="+ uploadFile.getName() + ";sourceid="+null+"\r\n";字段给服务器

服务器收到字段后，看到文件的sourceid字段值为空，则表示该文件第一次上传，服务器就会自动为其创建id，并且在本地根据文件名建立相应文件用于接收文件数据，同时把该文件路径和id保存在Map集合中，并发送：“sourceid="+ id+ ";position=0\r\n";内容给客户端，客户端收到服务器为其创建的id和应该从上传文件的什么位置开始读取信息后，在SQLite数据库中记录下本次上传文件的id和文件路径，然后上传文件。

服务器端则开始接收从客户端发来的数据并保存起来，并且时刻把该文件的上传的数据大小保存在以该文件命名的.log文件中。

当在发送的的时候突然关机或网络出现状况，当再次上传该文件时，客户端就会从SQLite中根据文件路径查找到已上传文件的id，然后发送内容给服务器端，服务器从发来的sourceid字段中读到了数据，就从map集合中找到该文件路径，然后根据路径和文件名找到.log文件，并从中读取上次上传文件的大小发送给客户端，客户端得到后遍选择从文件的指定文件读取上传，服务器则再次接收并从文件指定位置保存。



服务器端代码：

界面代码：

public class ServerWindow extends Frame{
	private FileServer s = new FileServer(7878);
	private Label label;
	
	public ServerWindow(String title){
		super(title);
		label = new Label();
		add(label, BorderLayout.PAGE_START);
		label.setText("服务器已经启动");
		this.addWindowListener(new WindowListener() {
			@Override
			public void windowOpened(WindowEvent e) {
				new Thread(new Runnable() {			
					@Override
					public void run() {
						try {
							s.start();
						} catch (Exception e) {
							e.printStackTrace();
						}
					}
				}).start();
			}
			
			@Override
			public void windowIconified(WindowEvent e) {
			}
			
			@Override
			public void windowDeiconified(WindowEvent e) {
			}
			
			@Override
			public void windowDeactivated(WindowEvent e) {
			}
			
			@Override
			public void windowClosing(WindowEvent e) {
				 s.quit();
				 System.exit(0);
			}
			
			@Override
			public void windowClosed(WindowEvent e) {
			}
			
			@Override
			public void windowActivated(WindowEvent e) {
			}
		});
	}
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		ServerWindow window = new ServerWindow("文件上传服务端"); 
		window.setSize(300, 300); 
		window.setVisible(true);
	}

}

主要类FileServer的代码

public class FileServer {
	 private ExecutorService executorService;//线程池
	 private int port;//监听端口
	 private boolean quit = false;//退出
	 private ServerSocket server;
	 private Map<Long, FileLog> datas = new HashMap<Long, FileLog>();//存放断点数据
	 
	 public FileServer(int port){
		 this.port = port;
		 //创建线程池，池中具有(cpu个数*50)条线程
		 executorService = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors() * 50);
	 }
	 /**
	  * 退出
	  */
	 public void quit(){
		this.quit = true;
		try {
			server.close();
		} catch (IOException e) {
		}
	 }
	 /**
	  * 启动服务
	  * @throws Exception
	  */
	 public void start() throws Exception{
		 server = new ServerSocket(port);
		 while(!quit){
	         try {
	           Socket socket = server.accept();
	           //为支持多用户并发访问，采用线程池管理每一个用户的连接请求
	           executorService.execute(new SocketTask(socket));
	         } catch (Exception e) {
	             e.printStackTrace();
	         }
	     }
	 }
	 
	 private final class SocketTask implements Runnable{
		private Socket socket = null;
		public SocketTask(Socket socket) {
			this.socket = socket;
		}
		
		@Override
		public void run() {
			try {
				System.out.println("accepted connection "+ socket.getInetAddress()+ ":"+ socket.getPort());
				PushbackInputStream inStream = new PushbackInputStream(socket.getInputStream());
				//得到客户端发来的第一行协议数据：Content-Length=143253434;filename=xxx.3gp;sourceid=
				//如果用户初次上传文件，sourceid的值为空。
				String head = StreamTool.readLine(inStream);
				System.out.println(head);
				if(head!=null){
					//下面从协议数据中提取各项参数值
					String[] items = head.split(";");
					String filelength = items[0].substring(items[0].indexOf("=")+1);
					String filename = items[1].substring(items[1].indexOf("=")+1);
					String sourceid = items[2].substring(items[2].indexOf("=")+1);		
					long id = System.currentTimeMillis();//生产资源id，如果需要唯一性，可以采用UUID
					FileLog log = null;
					if(sourceid!=null && !"".equals(sourceid)){
						id = Long.valueOf(sourceid);
						log = find(id);//查找上传的文件是否存在上传记录
					}
					File file = null;
					int position = 0;
					if(log==null){//如果上传的文件不存在上传记录,为文件添加跟踪记录
						String path = new SimpleDateFormat("yyyy/MM/dd/HH/mm").format(new Date());
						File dir = new File("file/"+ path);
						if(!dir.exists()) dir.mkdirs();
						file = new File(dir, filename);
						if(file.exists()){//如果上传的文件发生重名，然后进行改名
							filename = filename.substring(0, filename.indexOf(".")-1)+ dir.listFiles().length+ filename.substring(filename.indexOf("."));
							file = new File(dir, filename);
						}
						save(id, file);
					}else{// 如果上传的文件存在上传记录,读取上次的断点位置
						file = new File(log.getPath());//从上传记录中得到文件的路径
						if(file.exists()){
							File logFile = new File(file.getParentFile(), file.getName()+".log");
							if(logFile.exists()){
								Properties properties = new Properties();
								properties.load(new FileInputStream(logFile));
								position = Integer.valueOf(properties.getProperty("length"));//读取断点位置
							}
						}
					}
					
					OutputStream outStream = socket.getOutputStream();
					String response = "sourceid="+ id+ ";position="+ position+ "\r\n";
					//服务器收到客户端的请求信息后，给客户端返回响应信息：sourceid=1274773833264;position=0
					//sourceid由服务生成，唯一标识上传的文件，position指示客户端从文件的什么位置开始上传
					outStream.write(response.getBytes());
					
					RandomAccessFile fileOutStream = new RandomAccessFile(file, "rwd");
					if(position==0) fileOutStream.setLength(Integer.valueOf(filelength));//设置文件长度
					fileOutStream.seek(position);//移动文件指定的位置开始写入数据
					byte[] buffer = new byte[1024];
					int len = -1;
					int length = position;
					while( (len=inStream.read(buffer)) != -1){//从输入流中读取数据写入到文件中
						fileOutStream.write(buffer, 0, len);
						length += len;
						Properties properties = new Properties();
						properties.put("length", String.valueOf(length));
						FileOutputStream logFile = new FileOutputStream(new File(file.getParentFile(), file.getName()+".log"));
						properties.store(logFile, null);//实时记录文件的最后保存位置
						logFile.close();
					}
					if(length==fileOutStream.length()) delete(id);
					fileOutStream.close();					
					inStream.close();
					outStream.close();
					file = null;
					
				}
			} catch (Exception e) {
				e.printStackTrace();
			}finally{
	            try {
	                if(socket!=null && !socket.isClosed()) socket.close();
	            } catch (IOException e) {}
	        }
		}
	 }
	 
	 public FileLog find(Long sourceid){
		 return datas.get(sourceid);
	 }
	 //保存上传记录
	 public void save(Long id, File saveFile){
		 //日后可以改成通过数据库存放
		 datas.put(id, new FileLog(id, saveFile.getAbsolutePath()));
	 }
	 //当文件上传完毕，删除记录
	 public void delete(long sourceid){
		 if(datas.containsKey(sourceid)) datas.remove(sourceid);
	 }
	 
	 private class FileLog{
		private Long id;
		private String path;
		public Long getId() {
			return id;
		}
		public void setId(Long id) {
			this.id = id;
		}
		public String getPath() {
			return path;
		}
		public void setPath(String path) {
			this.path = path;
		}
		public FileLog(Long id, String path) {
			this.id = id;
			this.path = path;
		}	
	 }

}

工具类StreamTool代码

public class StreamTool {

// 读取从客户端发来的  "Content-Length="+ uploadFile.length() + ";filename="+ uploadFile.getName() + ";sourceid="+(souceid==null? "" : souceid)+"\r\n";

// 读到回车换行前面的内容
	 public static String readLine(PushbackInputStream in) throws IOException {
			char buf[] = new char[128];
			int room = buf.length;
			int offset = 0;
			int c;
loop:		while (true) {
				switch (c = in.read()) {
					case -1:
					case '\n':
						break loop;
					case '\r':
						int c2 = in.read();
						if ((c2 != '\n') && (c2 != -1)) in.unread(c2);
						break loop;
					default:
						if (--room < 0) {
							char[] lineBuffer = buf;
							buf = new char[offset + 128];
						    room = buf.length - offset - 1;
						    System.arraycopy(lineBuffer, 0, buf, 0, offset);
						   
						}
						buf[offset++] = (char) c;
						break;
				}
			}
			if ((c == -1) && (offset == 0)) return null;
			return String.copyValueOf(buf, 0, offset);
	}
}

Android客户端的界面：



Android客户端主要负责上传的代码：

按钮点击后调用uploadFile方法上传文件

button.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				String filename = filenameText.getText().toString();
				if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
					File uploadFile = new File(Environment.getExternalStorageDirectory(), filename);
					if(uploadFile.exists()){
						uploadFile(uploadFile);
					}else{
						Toast.makeText(UploadActivity.this, R.string.filenotexsit, 1).show();
					}
				}else{
					Toast.makeText(UploadActivity.this, R.string.sdcarderror, 1).show();
				}
			}
		});

uploadFile方法：

private void uploadFile(final File uploadFile) {
		new Thread(new Runnable() {			
			@Override
			public void run() {
				try {
					uploadbar.setMax((int)uploadFile.length());   // 设置进度条
					String souceid = logService.getBindId(uploadFile);     //调用logService获取文件的id，第一次上传没有记录会得到null
					String head = "Content-Length="+ uploadFile.length() + ";filename="+ uploadFile.getName() + ";sourceid="+
						(souceid==null? "" : souceid)+"\r\n";
					Socket socket = new Socket("172.19.68.65", 7878);   // 建立socket连接
					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));   // 设置文件读取的位置
					byte[] buffer = new byte[1024];
					int len = -1;
					int length = Integer.valueOf(position);
					while( (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();
	}

UploadLogService的主要方法

public class UploadLogService {
	private DBOpenHelper dbOpenHelper;
	
	public UploadLogService(Context context){
		this.dbOpenHelper = new DBOpenHelper(context);
	}
	// 保存文件的id和文件路径
	public void save(String sourceid, File uploadFile){
		SQLiteDatabase db = dbOpenHelper.getWritableDatabase();
		db.execSQL("insert into uploadlog(uploadfilepath, sourceid) values(?,?)",
				new Object[]{uploadFile.getAbsolutePath(),sourceid});
	}
	// 删除该文件记录
	public void delete(File uploadFile){
		SQLiteDatabase db = dbOpenHelper.getWritableDatabase();
		db.execSQL("delete from uploadlog where uploadfilepath=?", new Object[]{uploadFile.getAbsolutePath()});
	}
	// 根据文件路径获取文件id
	public String getBindId(File uploadFile){
		SQLiteDatabase db = dbOpenHelper.getReadableDatabase();
		Cursor cursor = db.rawQuery("select sourceid from uploadlog where uploadfilepath=?", 
				new String[]{uploadFile.getAbsolutePath()});
		if(cursor.moveToFirst()){
			return cursor.getString(0);
		}
		return null;
	}
}