Android基础入门教程——7.6.3 基于TCP协议的Socket通信(2)
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Android基础入门教程——7.6.3 基于TCP协议的Socket通信(2)
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Android基礎入門教程——7.6.3 基于TCP協議的Socket通信(2)
標簽（空格分隔）： Android基礎入門教程
本節引言：
上節中我們給大家接觸了Socket的一些基本概念以及使用方法，然后寫了一個小豬簡易聊天室的
Demo，相信大家對Socket有了初步的掌握，本節我們來學習下使用Socket來實現大文件的斷點續傳！
這里講解的是別人寫好的一個Socket上傳大文件的例子，不要求我們自己可以寫出來，需要的時候會用
就好！
1.運行效果圖：
1.先把我們編寫好的Socket服務端運行起來：
2.將一個音頻文件放到SD卡根目錄下：
3.運行我們的客戶端：
4.上傳成功后可以看到我們的服務端的項目下生成一個file的文件夾，我們可以在這里找到上傳的文件：
.log那個是我們的日志文件
2.實現流程圖：
3.代碼示例：
先編寫一個服務端和客戶端都會用到的流解析類：
StreamTool.java：
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);}/*** 讀取流* @param inStream* @return 字節數組* @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）服務端的實現：
socket管理與多線程管理類：
FileServer.java：
public class FileServer { private ExecutorService executorService;//線程池 private int port;//監聽端口 private boolean quit = false;//退出 private ServerSocket server; private Map<Long, FileLog> datas = new HashMap<Long, FileLog>();//存放斷點數據 public FileServer(int port){ this.port = port; //創建線程池，池中具有(cpu個數*50)條線程 executorService = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors() * 50); } /** * 退出 */ public void quit(){ this.quit = true; try { server.close(); } catch (IOException e) { } } /** * 啟動服務 * @throws Exception */ public void start() throws Exception{ server = new ServerSocket(port); while(!quit){ try { Socket socket = server.accept(); //為支持多用戶并發訪問，采用線程池管理每一個用戶的連接請求 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; } public void run() { try { System.out.println("accepted connection "+ socket.getInetAddress()+ ":"+ socket.getPort()); PushbackInputStream inStream = new PushbackInputStream(socket.getInputStream()); //得到客戶端發來的第一行協議數據：Content-Length=143253434;filename=xxx.3gp;sourceid= //如果用戶初次上傳文件，sourceid的值為空。 String head = StreamTool.readLine(inStream); System.out.println(head); if(head!=null){ //下面從協議數據中提取各項參數值 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();//生產資源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);//查找上傳的文件是否存在上傳記錄 } File file = null; int position = 0; if(log==null){//如果不存在上傳記錄,為文件添加跟蹤記錄 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()){//如果上傳的文件發生重名，然后進行改名 filename = filename.substring(0, filename.indexOf(".")-1)+ dir.listFiles().length+ filename.substring(filename.indexOf(".")); file = new File(dir, filename); } save(id, file); }else{// 如果存在上傳記錄,讀取已經上傳的數據長度 file = new File(log.getPath());//從上傳記錄中得到文件的路徑 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"));//讀取已經上傳的數據長度 } } } OutputStream outStream = socket.getOutputStream(); String response = "sourceid="+ id+ ";position="+ position+ "\r\n"; //服務器收到客戶端的請求信息后，給客戶端返回響應信息：sourceid=1274773833264;position=0 //sourceid由服務器端生成，唯一標識上傳的文件，position指示客戶端從文件的什么位置開始上傳 outStream.write(response.getBytes()); RandomAccessFile fileOutStream = new RandomAccessFile(file, "rwd"); if(position==0) fileOutStream.setLength(Integer.valueOf(filelength));//設置文件長度 fileOutStream.seek(position);//指定從文件的特定位置開始寫入數據 byte[] buffer = new byte[1024]; int len = -1; int length = position; while( (len=inStream.read(buffer)) != -1){//從輸入流中讀取數據寫入到文件中 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);//實時記錄已經接收的文件長度 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); } //保存上傳記錄 public void save(Long id, File saveFile){ //日后可以改成通過數據庫存放 datas.put(id, new FileLog(id, saveFile.getAbsolutePath())); } //當文件上傳完畢，刪除記錄 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; } } }服務端界面類:ServerWindow.java：
public class ServerWindow extends Frame {private FileServer s = new FileServer(12345);private Label label;public ServerWindow(String title) {super(title);label = new Label();add(label, BorderLayout.PAGE_START);label.setText("服務器已經啟動");this.addWindowListener(new WindowListener() {public void windowOpened(WindowEvent e) {new Thread(new Runnable() {public void run() {try {s.start();} catch (Exception e) {// e.printStackTrace();}}}).start();}public void windowIconified(WindowEvent e) {}public void windowDeiconified(WindowEvent e) {}public void windowDeactivated(WindowEvent e) {}public void windowClosing(WindowEvent e) {s.quit();System.exit(0);}public void windowClosed(WindowEvent e) {}public void windowActivated(WindowEvent e) {}});}/*** @param args*/public static void main(String[] args) throws IOException {InetAddress address = InetAddress.getLocalHost();ServerWindow window = new ServerWindow("文件上傳服務端：" + address.getHostAddress());window.setSize(400, 300);window.setVisible(true);}}2）客戶端(Android端)
首先是布局文件：activity_main.xml：
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent"android:orientation="vertical"android:padding="5dp"><TextView android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="文件名"android:textSize="18sp" /><EditText android:id="@+id/edit_fname"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="Nikki Jamal - Priceless.mp3" /><Button android:id="@+id/btn_upload"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="上傳" /><Button android:id="@+id/btn_stop"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="停止" /><ProgressBar android:id="@+id/pgbar"style="@android:style/Widget.ProgressBar.Horizontal"android:layout_width="fill_parent"android:layout_height="40px" /><TextView android:id="@+id/txt_result"android:layout_width="fill_parent"android:layout_height="wrap_content"android:gravity="center" /> </LinearLayout>因為斷點續傳，我們需要保存上傳的進度，我們需要用到數據庫，這里我們定義一個數據庫
管理類：DBOpenHelper.java：：
然后是數據庫操作類：UploadHelper.java：
/*** Created by Jay on 2015/9/17 0017.*/ public class UploadHelper {private DBOpenHelper dbOpenHelper;public UploadHelper(Context context) {dbOpenHelper = new DBOpenHelper(context);}public String getBindId(File file) {SQLiteDatabase db = dbOpenHelper.getReadableDatabase();Cursor cursor = db.rawQuery("select sourceid from uploadlog where path=?", new String[]{file.getAbsolutePath()});if (cursor.moveToFirst()) {return cursor.getString(0);}return null;}public void save(String sourceid, File file) {SQLiteDatabase db = dbOpenHelper.getWritableDatabase();db.execSQL("insert into uploadlog(path,sourceid) values(?,?)",new Object[]{file.getAbsolutePath(), sourceid});}public void delete(File file) {SQLiteDatabase db = dbOpenHelper.getWritableDatabase();db.execSQL("delete from uploadlog where path=?", new Object[]{file.getAbsolutePath()});} }對了，別忘了客戶端也要貼上那個流解析類哦，最后就是我們的MainActivity.java了：
public class MainActivity extends AppCompatActivity implements View.OnClickListener {private EditText edit_fname;private Button btn_upload;private Button btn_stop;private ProgressBar pgbar;private TextView txt_result;private UploadHelper upHelper;private boolean flag = true;private Handler handler = new Handler() {@Overridepublic void handleMessage(Message msg) {pgbar.setProgress(msg.getData().getInt("length"));float num = (float) pgbar.getProgress() / (float) pgbar.getMax();int result = (int) (num * 100);txt_result.setText(result + "%");if (pgbar.getProgress() == pgbar.getMax()) {Toast.makeText(MainActivity.this, "上傳成功", Toast.LENGTH_SHORT).show();}}};@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);bindViews();upHelper = new UploadHelper(this);}private void bindViews() {edit_fname = (EditText) findViewById(R.id.edit_fname);btn_upload = (Button) findViewById(R.id.btn_upload);btn_stop = (Button) findViewById(R.id.btn_stop);pgbar = (ProgressBar) findViewById(R.id.pgbar);txt_result = (TextView) findViewById(R.id.txt_result);btn_upload.setOnClickListener(this);btn_stop.setOnClickListener(this);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.btn_upload:String filename = edit_fname.getText().toString();flag = true;if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {File file = new File(Environment.getExternalStorageDirectory(), filename);if (file.exists()) {pgbar.setMax((int) file.length());uploadFile(file);} else {Toast.makeText(MainActivity.this, "文件并不存在~", Toast.LENGTH_SHORT).show();}} else {Toast.makeText(MainActivity.this, "SD卡不存在或者不可用", Toast.LENGTH_SHORT).show();}break;case R.id.btn_stop:flag = false;break;}}private void uploadFile(final File file) {new Thread(new Runnable() {public void run() {try {String sourceid = upHelper.getBindId(file);Socket socket = new Socket("172.16.2.54", 12345);OutputStream outStream = socket.getOutputStream();String head = "Content-Length=" + file.length() + ";filename=" + file.getName()+ ";sourceid=" + (sourceid != null ? sourceid : "") + "\r\n";outStream.write(head.getBytes());PushbackInputStream inStream = new PushbackInputStream(socket.getInputStream());String response = StreamTool.readLine(inStream);String[] items = response.split(";");String responseSourceid = items[0].substring(items[0].indexOf("=") + 1);String position = items[1].substring(items[1].indexOf("=") + 1);if (sourceid == null) {//如果是第一次上傳文件，在數據庫中不存在該文件所綁定的資源idupHelper.save(responseSourceid, file);}RandomAccessFile fileOutStream = new RandomAccessFile(file, "r");fileOutStream.seek(Integer.valueOf(position));byte[] buffer = new byte[1024];int len = -1;int length = Integer.valueOf(position);while (flag && (len = fileOutStream.read(buffer)) != -1) {outStream.write(buffer, 0, len);length += len;//累加已經上傳的數據長度Message msg = new Message();msg.getData().putInt("length", length);handler.sendMessage(msg);}if (length == file.length()) upHelper.delete(file);fileOutStream.close();outStream.close();inStream.close();socket.close();} catch (Exception e) {Toast.makeText(MainActivity.this, "上傳異常~", Toast.LENGTH_SHORT).show();}}}).start();}}對了，還有，記得往AndroidManifest.xml中寫入這些權限哦！
<!-- 在SDCard中創建與刪除文件權限 --><uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/><!-- 往SDCard寫入數據權限 --><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/><!-- 訪問internet權限 --><uses-permission android:name="android.permission.INTERNET"/>4.代碼下載：
Socket上傳大文件demo
5.本節小結：
本節給大家介紹了基于TCP協議的Socket的另一個實例：使用Socket完成大文件的續傳，
相信大家對Socket的了解更進一步，嗯，下一節再寫一個例子吧，兩個處于同一Wifi
下的手機相互傳遞數據的實例吧！就說這么多，謝謝~
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