效果：发送端用Socket发送指定路径的文件给接收端，接收端将文件存储到指定路径。
发送端的MainActivity.java
创建一个按钮，在按钮监听器中设置文件路径、文件名、IP地址以及端口号，然后开启一个线程执行SendFile()方法进行Socket文件发送。在SendFile()方法中，文件名和文件数据分别用name和data两个socket进行发送。
public class MainActivity extends Activity { private Button btnSend; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btnSend = (Button) findViewById(R.id.btnSend); btnSend.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { final String path = "/storage/emulated/0/qqmusic/song/A.mp3"; final String fileName = "A.mp3"; final String ipAddress = "192.168.1.143"; final int port = 9999; Thread sendThread = new Thread(new Runnable() { @Override public void run() { SendFile(fileName, path, ipAddress, port); } }); sendThread.start(); } }); } public String SendFile(String fileName, String path, String ipAddress, int port) { try { Socket name = new Socket(ipAddress, port); OutputStream outputName = name.getOutputStream(); OutputStreamWriter outputWriter = new OutputStreamWriter(outputName); BufferedWriter bwName = new BufferedWriter(outputWriter); bwName.write(fileName); bwName.close(); outputWriter.close(); outputName.close(); name.close(); Socket data = new Socket(ipAddress, port); OutputStream outputData = data.getOutputStream(); FileInputStream fileInput = new FileInputStream(path); int size = -1; byte[] buffer = new byte[1024]; while ((size = fileInput.read(buffer, 0, 1024)) != -1) { outputData.write(buffer, 0, size); } outputData.close(); fileInput.close(); data.close(); return fileName + " 发送完成"; } catch (Exception e) { return "发送错误:\n" + e.getMessage(); } } }接收端的MainActivity.java
在线程Listener中创建一个ServerSocket和Socket的对象，执行ReceiveFile()方法进行文件的接收。在ReceiveFile()方法中，由于发送端的SendFile方法使用两个socket分别发送文件名和文件数据，因此该方法也要两个socket，即name和data分别对文件名和文件数据进行接收。在socket data中需设置指定的文件存储路径。
public class MainActivity extends Activity { private ServerSocket server; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // 服务器端用于监听Socket的线程 Thread listener = new Thread(new Runnable() { @Override public void run() { int port = 9999; while (port > 9000) { try { server = new ServerSocket(port); break; } catch (Exception e) { port--; } } if (server != null) { while (true) { ReceiveFile(); } } } }); listener.start(); } // 文件接收方法 public String ReceiveFile() { try { // 接收文件名 Socket name = server.accept(); InputStream nameStream = name.getInputStream(); InputStreamReader streamReader = new InputStreamReader(nameStream); BufferedReader br = new BufferedReader(streamReader); String fileName = br.readLine(); br.close(); streamReader.close(); nameStream.close(); name.close(); // 接收文件数据 Socket data = server.accept(); InputStream dataStream = data.getInputStream(); File dir = new File("/sdcard/MyMusic"); // 创建文件的存储路径 if (!dir.exists()) { dir.mkdirs(); } String savePath = "/sdcard/MyMusic/" + fileName; // 定义完整的存储路径 FileOutputStream file = new FileOutputStream(savePath, false); byte[] buffer = new byte[1024]; int size = -1; while ((size = dataStream.read(buffer)) != -1) { file.write(buffer, 0, size); } file.close(); dataStream.close(); data.close(); return fileName + " 接收完成"; } catch (Exception e) { return "接收错误:\n" + e.getMessage(); } } }发送端和接收端的Demo下载链接：http://download.csdn.net/detail/kylsen/9686394
