使用 Socket 進行 Client-Server 檔案傳送：從 Client 端將檔案傳送給 Server 端

參考資料：
1、官方 Socket 文件（Client 端用來與 Server 連線的 Socket）
2、官方 ServerSocket 文件（Server 端用來接受 Client 端連線的 Socket）


Client 端的語法：

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InetAddress addressOfServer = InetAddress.getByName("127.0.0.1"); int portOfServer = 22;   // File to be transmitted File file = new File("/home/user/test.img"); // Create buffer byte[] buffer = new byte[2048]; int bytesReaded;   // Socket connection for connecting to the server Socket socketFromClient = null; // Output stream for transmitting file to the server DataOutputStream outputStream = null; // Input stream for reading local file FileInputStream fis = null;   try { 　　// Create socket 　　socketFromClient = new Socket(addressOfServer, portOfServer);   　　// Create output stream for transmitting file 　　outputStream = new DataOutputStream(socketFromClient.getOutputStream()); 　　// Create input Stream for reading file 　　FileInputStream fis = new FileInputStream(file);   　　// Start transmitting 　　while( (bytesReaded = fis.read(buffer)) > -1 ) { 　　　　outputStream.write(buffer, 0, bytesReaded); 　　　　outputStream.flush(); 　　} } finally { 　　// Close the stream objects 　　if(outputStream != null) outputStream.close(); 　　if(fis != null) fis.close(); }   // Close the connection of socket if(socketFromClient != null) socketFromClient.close();

Server 端語法：

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int portOfServer = 22;   // Start listening to port 22 ServerSocket serverSocket = new ServerSocket(serverPort); Socket clientSocket = serverSocket.accept();   // Reader for accepting the transmission from client BufferedInputStream bis = null; DataInputStream dis = null; // File writer for writing the file transmitted from the client File writtenFile = null; FileWriter fw = null; BufferedWriter bw = null;   try { 　　// Get the address of the connecting client 　　String addressOfClient = clientSocket.getRemoteSocketAddress().toString(); 　　// Get the stream which the client tranmits 　　bis = new BufferedInputStream(clientSocket.getInputStream()); 　　dis = new DataInputStream(bis);   　　// Create file writer 　　writtenFile = new File("transmittedFile"); 　　fw = new FileWriter(writtenFile); 　　bw = new BufferedWriter(fw);   　　// Create buffer 　　byte[] buffer = new byte[2048]; 　　int bytesReaded;   　　// Accept and write the file 　　while( (bytesReaded = dis.read(buffer)) > -1) { 　　　　bw.write(buffer, 0, bytesReaded); 　　　　bw.flush(); 　　} }finally { 　　// Close the stream and writer objects 　　if(bw != null) bw.close(); 　　if(fw != null) fw.close(); 　　if(dis != null) dis.close(); 　　if(bis != null) bis.close(); }

如果只是要傳送字串資料，而不是傳送檔案的話，作法好像是一樣的，可以參考以下的連結。

參考資料：
3、簡單的Socket Client Server