Android--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，服务器建立socket连接，监听一个端口（7878），然后建立一个outStream接收到客户端的字段信息，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，客户端通过inputStream获得服务器返回的字段，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;  

        }     

     }  

}  

 

1. public class ServerWindow extends Frame  
2. {  
3.     private FileServer s = new FileServer(7878);  
4.     private Label label;  
5.       
6.     public ServerWindow(String title)  
7.     {  
8.         super(title);  
9.         label = new Label();  
10.         add(label, BorderLayout.PAGE_START);  
11.         label.setText("服务器已经启动");  
12.         this.addWindowListener(new WindowListener()   
13.         {  
14.             @Override  
15.             public void windowOpened(WindowEvent e)   
16.             {  
17.                 new Thread(new Runnable()  
18.                 {             
19.                     @Override  
20.                     public void run()   
21.                     {  
22.                         try   
23.                         {  
24.                             s.start();  
25.                         }  
26.                         catch (Exception e)   
27.                         {  
28.                             e.printStackTrace();  
29.                         }  
30.                     }  
31.                 }).start();  
32.             }  
33.               
34.             @Override  
35.             public void windowIconified(WindowEvent e) {  
36.             }  
37.               
38.             @Override  
39.             public void windowDeiconified(WindowEvent e) {  
40.             }  
41.               
42.             @Override  
43.             public void windowDeactivated(WindowEvent e) {  
44.             }  
45.               
46.             @Override  
47.             public void windowClosing(WindowEvent e) {  
48.                  s.quit();  
49.                  System.exit(0);  
50.             }  
51.               
52.             @Override  
53.             public void windowClosed(WindowEvent e) {  
54.             }  
55.               
56.             @Override  
57.             public void windowActivated(WindowEvent e) {  
58.             }  
59.         });  
60.     }  
61.     /** 
62.      * @param args 
63.      */  
64.     public static void main(String[] args)   
65.     {  
66.         ServerWindow window = new ServerWindow("文件上传服务端");   
67.         window.setSize(300, 300);   
68.         window.setVisible(true);  
69.     }  
70. }  

1. public class SocketClient   
2. {  
3.     public static void main(String[] args)   
4.     {  
5.         try   
6.         {     
7.             //这里的套接字根据实际服务器更改   
8.             Socket socket = new Socket("127.0.0.1", 7878);  
9.             OutputStream outStream = socket.getOutputStream();              
10.             String filename = "QQWubiSetup.exe";  
11.             File file = new File(filename);  
12.             //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   
13.             //若是不存在则服务器会自动生成一个id,给客户端返回   
14.             String head = "Content-Length="+ file.length() + ";filename="+ filename + ";sourceid=1278916111468/r/n";  
15.             outStream.write(head.getBytes());  
16.               
17.             PushbackInputStream inStream = new PushbackInputStream(socket.getInputStream());      
18.             String response = StreamTool.readLine(inStream);  
19.             System.out.println(response);  
20.             String[] items = response.split(";");  
21.             //构造开始上传文件的位置   
22.             String position = items[1].substring(items[1].indexOf("=")+1);  
23.             //以读的方式开始访问   
24.             RandomAccessFile fileOutStream = new RandomAccessFile(file, "r");  
25.             fileOutStream.seek(Integer.valueOf(position));  
26.             byte[] buffer = new byte[1024];  
27.             int len = -1;  
28.             int i = 0;  
29.             while( (len = fileOutStream.read(buffer)) != -1)  
30.             {  
31.                 outStream.write(buffer, 0, len);  
32.                 i++;  
33.                 //if(i==10) break;   
34.             }  
35.             fileOutStream.close();  
36.             outStream.close();  
37.             inStream.close();  
38.             socket.close();  
39.         }   
40.         catch (Exception e)   
41.         {                      
42.             e.printStackTrace();  
43.         }  
44.     }  
45.     /** 
46.     * 读取流 
47.     * @param inStream 
48.     * @return 字节数组 
49.     * @throws Exception 
50.     */  
51.     public static byte[] readStream(InputStream inStream) throws Exception  
52.     {  
53.             ByteArrayOutputStream outSteam = new ByteArrayOutputStream();  
54.             byte[] buffer = new byte[1024];  
55.             int len = -1;  
56.             while( (len=inStream.read(buffer)) != -1)  
57.             {  
58.                 outSteam.write(buffer, 0, len);  
59.             }  
60.             outSteam.close();  
61.             inStream.close();  
62.             return outSteam.toByteArray();  
63.     }  
64. }  

1. public class StreamTool   
2. {  
3.        
4.      public static void save(File file, byte[] data) throws Exception   
5.      {  
6.          FileOutputStream outStream = new FileOutputStream(file);  
7.          outStream.write(data);  
8.          outStream.close();  
9.      }  
10.        
11.      public static String readLine(PushbackInputStream in) throws IOException   
12.      {  
13.             char buf[] = new char[128];  
14.             int room = buf.length;  
15.             int offset = 0;  
16.             int c;  
17.      loop:  while (true) {  
18.                 switch (c = in.read())   
19.                 {  
20.                     case -1:  
21.                     case '/n':  
22.                         break loop;  
23.                     case '/r':  
24.                         int c2 = in.read();  
25.                         if ((c2 != '/n') && (c2 != -1)) in.unread(c2);  
26.                         break loop;  
27.                     default:  
28.                         if (--room < 0) {  
29.                             char[] lineBuffer = buf;  
30.                             buf = new char[offset + 128];  
31.                             room = buf.length - offset - 1;  
32.                             System.arraycopy(lineBuffer, 0, buf, 0, offset);  
33.                              
34.                         }  
35.                         buf[offset++] = (char) c;  
36.                         break;  
37.                 }  
38.             }  
39.             if ((c == -1) && (offset == 0)) return null;  
40.             return String.copyValueOf(buf, 0, offset);  
41.     }  
42.        
43.     /** 
44.     * 读取流 
45.     * @param inStream 
46.     * @return 字节数组 
47.     * @throws Exception 
48.     */  
49.     public static byte[] readStream(InputStream inStream) throws Exception  
50.     {  
51.             ByteArrayOutputStream outSteam = new ByteArrayOutputStream();  
52.             byte[] buffer = new byte[1024];  
53.             int len = -1;  
54.             while( (len=inStream.read(buffer)) != -1){  
55.                 outSteam.write(buffer, 0, len);  
56.             }  
57.             outSteam.close();  
58.             inStream.close();  
59.             return outSteam.toByteArray();  
60.     }  
61. }  

（1）Android客户端代码：

1. public class UploadActivity extends Activity   
2. {  
3.     private EditText filenameText;  
4.     private TextView resulView;  
5.     private ProgressBar uploadbar;  
6.     private UploadLogService logService;  
7.       
8.     @Override  
9.     public void onCreate(Bundle savedInstanceState)  
10.     {  
11.         super.onCreate(savedInstanceState);  
12.         setContentView(R.layout.main);  
13.           
14.         logService = new UploadLogService(this);  
15.         filenameText = (EditText)this.findViewById(R.id.filename);  
16.         uploadbar = (ProgressBar) this.findViewById(R.id.uploadbar);  
17.         resulView = (TextView)this.findViewById(R.id.result);  
18.         Button button =(Button)this.findViewById(R.id.button);  
19.         button.setOnClickListener(new View.OnClickListener()   
20.         {  
21.             @Override  
22.             public void onClick(View v)   
23.             {  
24.                 String filename = filenameText.getText().toString();  
25.                 //判断SDCard是否存在   
26.                 if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))  
27.                 {  
28.                     //取得SDCard的目录   
29.                     File uploadFile = new File(Environment.getExternalStorageDirectory(), filename);  
30.                     if(uploadFile.exists())  
31.                     {  
32.                         uploadFile(uploadFile);  
33.                     }  
34.                     else  
35.                     {  
36.                         Toast.makeText(UploadActivity.this, R.string.filenotexsit, 1).show();  
37.                     }  
38.                 }  
39.                 else  
40.                 {  
41.                     Toast.makeText(UploadActivity.this, R.string.sdcarderror, 1).show();  
42.                 }  
43.             }  
44.         });  
45.     }  
46.     /** 
47.      * 使用Handler给创建他的线程发送消息， 
48.      * 匿名内部类 
49.      */  
50.     private Handler handler = new Handler()  
51.     {  
52.         @Override  
53.         public void handleMessage(Message msg)   
54.         {  
55.             //获得上传长度的进度   
56.             int length = msg.getData().getInt("size");  
57.             uploadbar.setProgress(length);  
58.             float num = (float)uploadbar.getProgress()/(float)uploadbar.getMax();  
59.             int result = (int)(num * 100);  
60.             //设置显示结果   
61.             resulView.setText(result+ "%");  
62.             //上传成功   
63.             if(uploadbar.getProgress()==uploadbar.getMax())  
64.             {  
65.                 Toast.makeText(UploadActivity.this, R.string.success, 1).show();  
66.             }  
67.         }  
68.     };  
69.       
70.     /** 
71.      * 上传文件,应该启动一个线程，使用Handler来避免UI线程ANR错误 
72.      * @param final uploadFile 
73.      */  
74.     private void uploadFile(final File uploadFile)   
75.     {  
76.         new Thread(new Runnable()   
77.         {             
78.             @Override  
79.             public void run()   
80.             {  
81.                 try   
82.                 {  
83.                     //设置长传文件的最大刻度   
84.                     uploadbar.setMax((int)uploadFile.length());  
85.                     //判断文件是否已有上传记录   
86.                     String souceid = logService.getBindId(uploadFile);  
87.                     //构造拼接协议   
88.                     String head = "Content-Length="+ uploadFile.length() + ";filename="+ uploadFile.getName() + ";sourceid="+  
89.                         (souceid==null? "" : souceid)+"/r/n";  
90.                     //通过Socket取得输出流   
91.                     Socket socket = new Socket("192.168.1.100", 7878);  
92.                     OutputStream outStream = socket.getOutputStream();  
93.                     outStream.write(head.getBytes());  
94.                       
95.                     PushbackInputStream inStream = new PushbackInputStream(socket.getInputStream());      
96.                     //获取到字符流的id与位置   
97.                     String response = StreamTool.readLine(inStream);  
98.                     String[] items = response.split(";");  
99.                     String responseid = items[0].substring(items[0].indexOf("=")+1);  
100.                     String position = items[1].substring(items[1].indexOf("=")+1);  
101.                     //代表原来没有上传过此文件，往数据库添加一条绑定记录   
102.                     if(souceid==null)  
103.                     {  
104.                         logService.save(responseid, uploadFile);  
105.                     }  
106.                     RandomAccessFile fileOutStream = new RandomAccessFile(uploadFile, "r");  
107.                     fileOutStream.seek(Integer.valueOf(position));  
108.                     byte[] buffer = new byte[1024];  
109.                     int len = -1;  
110.                     //初始化长传的数据长度   
111.                     int length = Integer.valueOf(position);  
112.                     while( (len = fileOutStream.read(buffer)) != -1)  
113.                     {  
114.                         outStream.write(buffer, 0, len);  
115.                         //设置长传数据长度   
116.                         length += len;  
117.                         Message msg = new Message();  
118.                         msg.getData().putInt("size", length);  
119.                         handler.sendMessage(msg);  
120.                     }  
121.                     fileOutStream.close();  
122.                     outStream.close();  
123.                     inStream.close();  
124.                     socket.close();  
125.                     //判断上传完则删除数据   
126.                     if(length==uploadFile.length())   
127.                         logService.delete(uploadFile);  
128.                 }   
129.                 catch (Exception e)  
130.                 {  
131.                     e.printStackTrace();  
132.                 }  
133.             }  
134.         }).start();  
135.     }  
136. }  

1. public class DBOpenHelper extends SQLiteOpenHelper   
2. {  
3.     public DBOpenHelper(Context context)   
4.     {  
5.         super(context, "upload.db", null, 1);  
6.     }  
7.     @Override  
8.     public void onCreate(SQLiteDatabase db)   
9.     {  
10.         db.execSQL("CREATE TABLE uploadlog (_id integer primary key autoincrement, uploadfilepath varchar(100), sourceid varchar(10))");  
11.     }  
12.     @Override  
13.     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)   
14.     {  
15.         db.execSQL("DROP TABLE IF EXISTS uploadlog");  
16.         onCreate(db);         
17.     }  
18. }  

1. public class UploadLogService   
2. {  
3.     private DBOpenHelper dbOpenHelper;  
4.     //给出上下文对象   
5.     public UploadLogService(Context context)  
6.     {  
7.         this.dbOpenHelper = new DBOpenHelper(context);  
8.     }  
9.     //保存上传文件断点数据   
10.     public void save(String sourceid, File uploadFile)  
11.     {  
12.         SQLiteDatabase db = dbOpenHelper.getWritableDatabase();  
13.         db.execSQL("insert into uploadlog(uploadfilepath, sourceid) values(?,?)",  
14.                 new Object[]{uploadFile.getAbsolutePath(),sourceid});  
15.     }  
16.     //删除上传文件断点数据   
17.     public void delete(File uploadFile)  
18.     {  
19.         SQLiteDatabase db = dbOpenHelper.getWritableDatabase();  
20.         db.execSQL("delete from uploadlog where uploadfilepath=?", new Object[]{uploadFile.getAbsolutePath()});  
21.     }  
22.     //根据文件的上传路径得到绑定的id   
23.     public String getBindId(File uploadFile)  
24.     {  
25.         SQLiteDatabase db = dbOpenHelper.getReadableDatabase();  
26.         Cursor cursor = db.rawQuery("select sourceid from uploadlog where uploadfilepath=?",   
27.                 new String[]{uploadFile.getAbsolutePath()});  
28.         if(cursor.moveToFirst())  
29.         {  
30.             return cursor.getString(0);  
31.         }  
32.         return null;  
33.     }  
34. }  

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();  

    }  

}