安卓客户端通过socket与服务器端通讯一般可以按照以下几个步骤：
（1）.通过IP地址和端口实例化Socket，请求连接服务器：
socket = new Socket(HOST, PORT); //host:为服务器的IP地址 port：为服务器的端口号
（2）.获取Socket流以进行读写，并把流包装进BufferWriter或者PrintWriter：
PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(socket.getOutputStream())),true);
这里涉及了三个类：socket.getOutputStream得到socket的输出字节流，OutputStreamWriter是字节流向字符流转换的桥梁，BufferWriter是字符流，然后再包装进PrintWriter。
（3）对Socket进行读写
if (socket.isConnected()) {
if (!socket.isOutputShutdown()) {
out.println(msg);
}
}
（4）关闭打开的流，一定要注意对socket输入流/输出流的关闭.
out.close();
main.xml中的参考代码：
<?xml version=＂1.0＂ encoding=＂utf-8＂?> <LinearLayout xmlns:android=http://schemas.android.com/apk/res/android android:orientation=＂vertical＂ android:layout_width=＂fill_parent＂ android:layout_height=＂fill_parent＂> <TextView android:id=＂@+id/TextView＂ android:singleLine=＂false＂ android:layout_width=＂fill_parent＂ android:layout_height=＂wrap_content＂ /> <EditText android:hint=＂content＂ android:id=＂@+id/EditText01＂ android:layout_width=＂fill_parent＂ android:layout_height=＂wrap_content＂> </EditText> <Button android:text=＂send＂ android:id=＂@+id/Button01＂ android:layout_width=＂fill_parent＂ android:layout_height=＂wrap_content＂> </Button> </LinearLayout>
安卓客户端的源代码：
public class SocketDemo extends Activity implements Runnable { private TextView tv_msg = null; private EditText ed_msg = null; private Button btn_send = null; private static final String HOST = ＂192.168.1.150＂; private static final int PORT = 9999; private Socket socket = null; private BufferedReader in = null; private PrintWriter out = null; private String content = ＂＂; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); tv_msg = (TextView) findViewById(R.id.TextView); ed_msg = (EditText) findViewById(R.id.EditText01); btn_send = (Button) findViewById(R.id.Button01); try { socket = new Socket(HOST, PORT); in = new BufferedReader(new InputStreamReader(socket.getInputStream())); out = new PrintWriter(new BufferedWriter(new OutputStreamWriter( socket.getOutputStream())), true); } catch (IOException ex) { ex.printStackTrace(); ShowDialog(＂login exception＂ + ex.getMessage()); } btn_send.setOnClickListener(new Button.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub String msg = ed_msg.getText().toString(); if (socket.isConnected()) { if (!socket.isOutputShutdown()) { out.println(msg); } } } }); new Thread(SocketDemo.this).start(); } public void ShowDialog(String msg) { new AlertDialog.Builder(this).setTitle(＂notification＂).setMessage(msg) .setPositiveButton(＂ok＂, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub } }).show(); } public void run() { try { while (true) { if (socket.isConnected()) { if (!socket.isInputShutdown()) { if ((content = in.readLine()) != null) { content += ＂ ＂; mHandler.sendMessage(mHandler.obtainMessage()); } else { } } } } } catch (Exception e) { e.printStackTrace(); } } public Handler mHandler = new Handler() { public void handleMessage(Message msg) { super.handleMessage(msg); tv_msg.setText(tv_msg.getText().toString() + content); } }; }
服务器端得java代码：
public class Main { private static final int PORT = 9999; private List<Socket> mList = new ArrayList<Socket>(); private ServerSocket server = null; private ExecutorService mExecutorService = null; //线程池 public static void main(String[] args) { new Main(); } public Main() { try { server = new ServerSocket(PORT); mExecutorService = Executors.newCachedThreadPool(); //创建一个线程池 System.out.print(＂server start ...＂); Socket client = null; while(true) { client = server.accept(); mList.add(client); mExecutorService.execute(new Service(client)); //启动一个新线程来处理连接 } }catch (Exception e) { e.printStackTrace(); } } class Service implements Runnable { private Socket socket; private BufferedReader in = null; private String msg = ＂＂; public Service(Socket socket) { this.socket = socket; try { in = new BufferedReader(new InputStreamReader(socket.getInputStream())); msg = ＂user＂ +this.socket.getInetAddress() + ＂come toal:＂ +mList.size(); this.sendmsg(); } catch (IOException e) { e.printStackTrace(); } } @Override public void run() { // TODO Auto-generated method stub try { while(true) { if((msg = in.readLine())!= null) { if(msg.equals(＂exit＂)) { System.out.println(＂ssssssss＂); mList.remove(socket); in.close(); msg = ＂user:＂ + socket.getInetAddress() + ＂exit total:＂ + mList.size(); socket.close(); this.sendmsg(); break; } else { msg = socket.getInetAddress() + ＂:＂ + msg; this.sendmsg(); } } } } catch (Exception e) { e.printStackTrace(); } } public void sendmsg() { System.out.println(msg); int num =mList.size(); for (int i = 0; i < num; i++) { Socket mSocket = mList.get(index); PrintWriter pout = null; try { pout = new PrintWriter(new BufferedWriter( new OutputStreamWriter(mSocket.getOutputStream())),true); pout.println(msg); }catch (IOException e) { e.printStackTrace(); } } } } }