Android 开发TCP、UdP客户端

在进行Android开发的过程中，免不了，要开发TCP/UDP通讯的程序，下面这两段代码，分别介绍了TCP/UCP通过的一个实例：

代码一：

private void tcpdata() {

try {

Socket s = new Socket("192.168.0.25", 65500);

// outgoing stream redirect to socket

OutputStream out = s.getOutputStream();

// 注意第二个参数据为true将会自动flush，否则需要需要手动操作out.flush()

PrintWriter output = new PrintWriter(out, true);

output.println("Hello IdeasAndroid! 伪IP为："

+ SIMCardToIP("13512345006"));

InputStream inputStream = s.getInputStream();

DataInputStream input = new DataInputStream(inputStream);

byte[] b = new byte[10000];

int length = input.read(b);

inputReader = new InputStreamReader(inputStream);

String Msg = new String(b, 0, length, "gb2312");

Toast.makeText(TcpTest.this, Msg, 1000).show();

Log.d("Tcp Demo", "message From Server:" + Msg);

s.close();

} catch (UnknownHostException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

下面的代码是UDP通讯的过程：

public String send(String msg) {

StringBuilder sb = new StringBuilder();

InetAddress local = null;

try {

local = InetAddress.getByName("192.168.0.25"); // 本机测试

} catch (UnknownHostException e) {

e.printStackTrace();

}

try {

dSocket = new DatagramSocket(); // 注意此处要先在配置文件里设置权限,否则会抛权限不足的异常

} catch (SocketException e) {

e.printStackTrace();

}

int msg_len = msg == null ? 0 : msg.length();

DatagramPacket dPacket = new DatagramPacket(msg.getBytes(), msg_len,

local, SERVER_PORT);

try {

dSocket.send(dPacket);

} catch (IOException e) {

e.printStackTrace();

}

try {

dSocket.receive(dPacket);

sb.append(new String(dPacket.getData()));

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

dSocket.close();

return sb.toString();

}