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(); } }