Android的TCP和UDP傳輸 簡單程序

    try {  
                Socket s = new Socket("localhost", 12345);  
                // outgoing stream redirect to socket  
                OutputStream out = s.getOutputStream();  
                // 注意第二個參數據為true將會自動flush，否則需要需要手動操作out.flush()  
                PrintWriter output = new PrintWriter(out, true);  
                output.println("Hello IdeasAndroid!");  
                BufferedReader input = new BufferedReader(newInputStreamReader(s  
                        .getInputStream()));  
                // read line(s)  
                String message = input.readLine();  
                Log.d("Tcp Demo", "message From Server:" + message);  
                s.close();  
       
            } catch (UnknownHostException e) {  
                e.printStackTrace();  
            } catch (IOException e) {  
                e.printStackTrace();  
            } 

UDP服務器端代碼：

    // UDP服務器監聽的端口  
            Integer port = 12345;  
            // 接收的字節大小，客戶端發送的數據不能超過這個大小  
            byte[] message = new byte[1024];  
            try {  
                // 建立Socket連接  
                DatagramSocket datagramSocket = new DatagramSocket(port);  
                DatagramPacket datagramPacket = new DatagramPacket(message,  
                        message.length);  
                try {  
                    while (true) {  
                        // 准備接收數據  
                        datagramSocket.receive(datagramPacket);  
                        Log.d("UDP Demo", datagramPacket.getAddress()  
                                .getHostAddress().toString()  
                                + ":" + new String(datagramPacket.getData()));  
                    }  
                } catch (IOException e) {  
                    e.printStackTrace();  
                }  
            } catch (SocketException e) {  
                e.printStackTrace();  
            } 

    public static void send(String message) {  
            message = (message == null ? "Hello IdeasAndroid!" : message);  
            int server_port = 12345;  
            DatagramSocket s = null;  
            try {  
                s = new DatagramSocket();  
            } catch (SocketException e) {  
                e.printStackTrace();  
            }  
            InetAddress local = null;  
            try {  
                // 換成服務器端IP  
                local = InetAddress.getByName("localhost");  
            } catch (UnknownHostException e) {  
                e.printStackTrace();  
            }  
            int msg_length = message.length();  
            byte[] messagemessageByte = message.getBytes();  
            DatagramPacket p = new DatagramPacket(messageByte, msg_length, local,  
                    server_port);  
            try {  
                s.send(p);  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
        }