Android下使用TCP/IP协议实现断点上传

0.使用http协议是不能实现断点上传的，对于文件大小不一，与实际需求可以使用Socket断点上传

1.上传原理：Android客户端发送上传文件头字段给服务器，服务器判断文件是否在服务器上，文件是否有上传的记录，若是文件不存在，服务器则返回一个id（断点数据）通知客户端从什么位置开始上传，客户端开始从获得的位置开始上传文件

2.实例演示

（0）服务器端代码

public class FileServer
{
     //线程池
     private ExecutorService executorService;
     //监听端口
     private int port;
     //退出
     private boolean quit = false;
     private ServerSocket server;
     //存放断点数据
     private Map<Long, FileLog> datas = new HashMap<Long, FileLog>();

     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)
        {
            e.printStackTrace();
        }
     }

     /**
      * 启动服务
      * @throws Exception
      */
     public void start() throws Exception
     {
         //实现端口监听
         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());
                //这里的输入流PushbackInputStream可以回退到之前的某个点开始进行读取
                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);
                    //生产资源id，如果需要唯一性，可以采用UUID
                    long id = System.currentTimeMillis();
                    FileLog log = null;
                    if(sourceid!=null && !"".equals(sourceid))
                    {
                        id = Long.valueOf(sourceid);
                        //查找上传的文件是否存在上传记录
                        log = find(id);
                    }
                    File file = null;
                    int position = 0;
                    //如果上传的文件不存在上传记录,为文件添加跟踪记录
                    if(log==null)
                    {
                        String path = new SimpleDateFormat("yyyy/MM/dd/HH/mm").format(new Date());
                        //设置存放的位置与当前应用的位置有关
                        File dir = new File("file/"+ path);
                        if(!dir.exists()) dir.mkdirs();
                        file = new File(dir, filename);
                        //如果上传的文件发生重名，然后进行改名
                        if(file.exists())
                        {
                            filename = filename.substring(0, filename.indexOf(".")-1)+ dir.listFiles().length+ filename.substring(filename.indexOf("."));
                            file = new File(dir, filename);
                        }
                        save(id, file);
                    }
                    // 如果上传的文件存在上传记录,读取上次的断点位置
                    else
                    {
                        //从上传记录中得到文件的路径
                        file = new File(log.getPath());
                        if(file.exists())
                        {
                            File logFile = new File(file.getParentFile(), file.getName()+".log");
                            if(logFile.exists())
                            {
                                Properties properties = new Properties();
                                properties.load(new FileInputStream(logFile));
                                //读取断点位置
                                position = Integer.valueOf(properties.getProperty("length"));
                            }
                        }
                    }

                    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");
                    //设置文件长度
                    if(position==0) fileOutStream.setLength(Integer.valueOf(filelength));
                    //移动文件指定的位置开始写入数据
                    fileOutStream.seek(position);
                    byte[] buffer = new byte[1024];
                    int len = -1;
                    int length = position;
                    //从输入流中读取数据写入到文件中
                    while( (len=inStream.read(buffer)) != -1)
                    {
                        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"));
                        //实时记录文件的最后保存位置
                        properties.store(logFile, null);
                        logFile.close();
                    }
                    //如果长传长度等于实际长度则表示长传成功
                    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)
                {
                    e.printStackTrace();
                }
            }
        }
     }

     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;
        }
     }
}

 

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);
    }
}

 

public class SocketClient
{
    public static void main(String[] args)
    {
        try
        {
            //这里的套接字根据实际服务器更改
            Socket socket = new Socket("127.0.0.1", 7878);
            OutputStream outStream = socket.getOutputStream();
            String filename = "QQWubiSetup.exe";
            File file = new File(filename);
            //构造上传文件头，上传的时候会判断上传的文件是否存在，是否存在上传记录
            //若是不存在则服务器会自动生成一个id,给客户端返回
            String head = "Content-Length="+ file.length() + ";filename="+ filename + ";sourceid=1278916111468/r/n";
            outStream.write(head.getBytes());

            PushbackInputStream inStream = new PushbackInputStream(socket.getInputStream());
            String response = StreamTool.readLine(inStream);
            System.out.println(response);
            String[] items = response.split(";");
            //构造开始上传文件的位置
            String position = items[1].substring(items[1].indexOf("=")+1);
            //以读的方式开始访问
            RandomAccessFile fileOutStream = new RandomAccessFile(file, "r");
            fileOutStream.seek(Integer.valueOf(position));
            byte[] buffer = new byte[1024];
            int len = -1;
            int i = 0;
            while( (len = fileOutStream.read(buffer)) != -1)
            {
                outStream.write(buffer, 0, len);
                i++;
                //if(i==10) break;
            }
            fileOutStream.close();
            outStream.close();
            inStream.close();
            socket.close();
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }
    /**
    * 读取流
    * @param inStream
    * @return 字节数组
    * @throws Exception
    */
    public static byte[] readStream(InputStream inStream) throws Exception
    {
            ByteArrayOutputStream outSteam = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int len = -1;
            while( (len=inStream.read(buffer)) != -1)
            {
                outSteam.write(buffer, 0, len);
            }
            outSteam.close();
            inStream.close();
            return outSteam.toByteArray();
    }
}

 

public class StreamTool
{

     public static void save(File file, byte[] data) throws Exception
     {
         FileOutputStream outStream = new FileOutputStream(file);
         outStream.write(data);
         outStream.close();
     }

     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);
    }

    /**
    * 读取流
    * @param inStream
    * @return 字节数组
    * @throws Exception
    */
    public static byte[] readStream(InputStream inStream) throws Exception
    {
            ByteArrayOutputStream outSteam = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int len = -1;
            while( (len=inStream.read(buffer)) != -1){
                outSteam.write(buffer, 0, len);
            }
            outSteam.close();
            inStream.close();
            return outSteam.toByteArray();
    }
}

 

（1）Android客户端代码：

public class UploadActivity extends Activity
{
    private EditText filenameText;
    private TextView resulView;
    private ProgressBar uploadbar;
    private UploadLogService logService;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        logService = new UploadLogService(this);
        filenameText = (EditText)this.findViewById(R.id.filename);
        uploadbar = (ProgressBar) this.findViewById(R.id.uploadbar);
        resulView = (TextView)this.findViewById(R.id.result);
        Button button =(Button)this.findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                String filename = filenameText.getText().toString();
                //判断SDCard是否存在
                if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
                {
                    //取得SDCard的目录
                    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();
                }
            }
        });
    }
    /**
     * 使用Handler给创建他的线程发送消息，
     * 匿名内部类
     */
    private Handler handler = new Handler()
    {
        @Override
        public void handleMessage(Message msg)
        {
            //获得上传长度的进度
            int length = msg.getData().getInt("size");
            uploadbar.setProgress(length);
            float num = (float)uploadbar.getProgress()/(float)uploadbar.getMax();
            int result = (int)(num * 100);
            //设置显示结果
            resulView.setText(result+ "%");
            //上传成功
            if(uploadbar.getProgress()==uploadbar.getMax())
            {
                Toast.makeText(UploadActivity.this, R.string.success, 1).show();
            }
        }
    };

    /**
     * 上传文件,应该启动一个线程，使用Handler来避免UI线程ANR错误
     * @param final uploadFile
     */
    private void uploadFile(final File uploadFile)
    {
        new Thread(new Runnable()
        {
            @Override
            public void run()
            {
                try
                {
                    //设置长传文件的最大刻度
                    uploadbar.setMax((int)uploadFile.length());
                    //判断文件是否已有上传记录
                    String souceid = logService.getBindId(uploadFile);
                    //构造拼接协议
                    String head = "Content-Length="+ uploadFile.length() + ";filename="+ uploadFile.getName() + ";sourceid="+
                        (souceid==null? "" : souceid)+"/r/n";
                    //通过Socket取得输出流
                    Socket socket = new Socket("192.168.1.100", 7878);
                    OutputStream outStream = socket.getOutputStream();
                    outStream.write(head.getBytes());

                    PushbackInputStream inStream = new PushbackInputStream(socket.getInputStream());
                    //获取到字符流的id与位置
                    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);
                    //代表原来没有上传过此文件，往数据库添加一条绑定记录
                    if(souceid==null)
                    {
                        logService.save(responseid, uploadFile);
                    }
                    RandomAccessFile fileOutStream = new RandomAccessFile(uploadFile, "r");
                    fileOutStream.seek(Integer.valueOf(position));
                    byte[] buffer = new byte[1024];
                    int len = -1;
                    //初始化长传的数据长度
                    int length = Integer.valueOf(position);
                    while( (len = fileOutStream.read(buffer)) != -1)
                    {
                        outStream.write(buffer, 0, len);
                        //设置长传数据长度
                        length += len;
                        Message msg = new Message();
                        msg.getData().putInt("size", length);
                        handler.sendMessage(msg);
                    }
                    fileOutStream.close();
                    outStream.close();
                    inStream.close();
                    socket.close();
                    //判断上传完则删除数据
                    if(length==uploadFile.length())
                        logService.delete(uploadFile);
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                }
            }
        }).start();
    }
}

 

public class DBOpenHelper extends SQLiteOpenHelper
{
    public DBOpenHelper(Context context)
    {
        super(context, "upload.db", null, 1);
    }
    @Override
    public void onCreate(SQLiteDatabase db)
    {
        db.execSQL("CREATE TABLE uploadlog (_id integer primary key autoincrement, uploadfilepath varchar(100), sourceid varchar(10))");
    }
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
    {
        db.execSQL("DROP TABLE IF EXISTS uploadlog");
        onCreate(db);
    }
}

 

public class UploadLogService
{
    private DBOpenHelper dbOpenHelper;
    //给出上下文对象
    public UploadLogService(Context context)
    {
        this.dbOpenHelper = new DBOpenHelper(context);
    }
    //保存上传文件断点数据
    public void save(String sourceid, File uploadFile)
    {
        SQLiteDatabase db = dbOpenHelper.getWritableDatabase();
        db.execSQL("insert into uploadlog(uploadfilepath, sourceid) values(?,?)",
                new Object[]{uploadFile.getAbsolutePath(),sourceid});
    }
    //删除上传文件断点数据
    public void delete(File uploadFile)
    {
        SQLiteDatabase db = dbOpenHelper.getWritableDatabase();
        db.execSQL("delete from uploadlog where uploadfilepath=?", new Object[]{uploadFile.getAbsolutePath()});
    }
    //根据文件的上传路径得到绑定的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;
    }
}

 

public class StreamTool
{

     public static void save(File file, byte[] data) throws Exception
     {
         FileOutputStream outStream = new FileOutputStream(file);
         outStream.write(data);
         outStream.close();
     }

     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);
    }

    /**
    * 读取流
    * @param inStream
    * @return 字节数组
    * @throws Exception
    */
    public static byte[] readStream(InputStream inStream) throws Exception
    {
            ByteArrayOutputStream outSteam = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int len = -1;
            while( (len=inStream.read(buffer)) != -1)
            {
                outSteam.write(buffer, 0, len);
            }
            outSteam.close();
            inStream.close();
            return outSteam.toByteArray();
    }
}