一直以来对Android socket通信都很模糊，今天终于研究了一个网上的例子，自己又修改了下，算是对Android socket通信有点了解了。
下面是具体的代码，说明都在注释中了。需要注意的是，只有客户端发送了信息给服务器后，服务器才能响应客户端的输入，然后返回信息给客户端，这是客户端才能读取服务器返回的信息。如果客户端和服务器都处于等待对方的信息，那样就会造成阻塞，导致ANR了。
1.服务器端代码，就是一个java程序，与android无关，运行于服务器上，即PC机上。
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import java.io.BufferedReader;
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import java.io.BufferedWriter;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.InputStreamReader;
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import java.io.OutputStreamWriter;
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import java.io.PrintWriter;
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import java.net.ServerSocket;
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import java.net.Socket;
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public class Server implements Runnable {
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public static final String SERVERIP = "192.168.1.100";
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public static final int SERVERPORT = 51706;
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public void run() {
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try {
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System.out.println("S: Connecting...");
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ServerSocket serverSocket = new ServerSocket(SERVERPORT);
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while (true) {
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Socket client = serverSocket.accept();
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System.out.println("S: Receiving...");
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try {
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BufferedReader in = new BufferedReader(
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new InputStreamReader(client.getInputStream()));
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PrintWriter out = new PrintWriter(new BufferedWriter(
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new OutputStreamWriter(client.getOutputStream())),true);
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System.out.println("S: 111111");
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String str = in.readLine();
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System.out.println("S: 222222");
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if (str != null ) {
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out.println("You sent to server message is:" + str);
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out.flush();
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File file = new File ("C://android.txt");
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FileOutputStream fops = new FileOutputStream(file);
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byte [] b = str.getBytes();
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for ( int i = 0 ; i < b.length; i++ )
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{
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fops.write(b[i]);
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}
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System.out.println("S: Received: ‘" + str + "‘");
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} else {
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System.out.println("Not receiver anything from client!");
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}
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} catch (Exception e) {
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System.out.println("S: Error 1");
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e.printStackTrace();
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} finally {
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client.close();
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System.out.println("S: Done.");
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}
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}
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} catch (Exception e) {
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System.out.println("S: Error 2");
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e.printStackTrace();
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}
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}
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public static void main(String [] args ) {
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Thread desktopServerThread = new Thread(new Server());
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desktopServerThread.start();
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}
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}
2.客户端程序，运行在手机或者模拟器上。
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import java.io.BufferedReader;
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import java.io.BufferedWriter;
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import java.io.InputStreamReader;
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import java.io.OutputStreamWriter;
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import java.io.PrintWriter;
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import java.net.InetAddress;
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import java.net.Socket;
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import java.net.UnknownHostException;
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import android.app.Activity;
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import android.os.Bundle;
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import android.util.Log;
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import android.view.View;
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import android.view.View.OnClickListener;
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import android.widget.Button;
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import android.widget.EditText;
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import android.widget.TextView;
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public class Socket_Android extends Activity {
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private static final String TAG = "Socket_Android";
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private EditText mEditText = null;
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private TextView tx1 = null;
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private Button mButton = null;
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.main);
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mButton = (Button)findViewById(R.id.Button01);
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mEditText = (EditText)findViewById(R.id.etSendMsg);
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tx1 = (TextView)findViewById(R.id.tx);
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mButton.setOnClickListener(new OnClickListener() {
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@Override
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public void onClick(View v) {
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setTitle("测试Socket连接");
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Socket socket = null;
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try {
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InetAddress serverAddr = InetAddress.getByName("192.168.1.100");
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Log.d("TCP", "C: Connecting...");
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socket = new Socket(serverAddr, 51706);
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String message = "---Test_Socket_Android---";
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Log.d("TCP", "C: Sending: ‘" + message + "‘");
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PrintWriter out = new PrintWriter(new BufferedWriter(
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new OutputStreamWriter(socket.getOutputStream())),
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true);
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String toServer = mEditText.getText().toString();
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Log.d(TAG, "To server:‘" + toServer + "‘");
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out.println(toServer);
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out.flush();
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BufferedReader in = new BufferedReader(
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new InputStreamReader(socket.getInputStream()));
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String msg = in.readLine();
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Log.d(TAG, "From server:‘" + msg + "‘");
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tx1.setText(msg);
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} catch(UnknownHostException e) {
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Log.e(TAG, "192.168.1.100 is unkown server!");
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} catch(Exception e) {
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e.printStackTrace();
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} finally {
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try {
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socket.close();
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} catch(Exception e) {
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e.printStackTrace();
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}
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}
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}
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});
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}
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}
3.在客户端AndroidManifest.xml文件增加访问互联网的权限
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<uses-permission android:name="android.permission.INTERNET" />
4.运行效果：
服务器接的log输出：
S: Receiving...
S: 111111
S: 222222
S: Received: ‘hello‘
S: Done.
Android客户端与PC服务器通过socket进行交互实例
原文：http://blog.csdn.net/jian_csdn/article/details/44080665
