Android客户端与PC服务器通过socket进行交互实例

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。

import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileOutputStream;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.io.PrintWriter;import java.net.ServerSocket;import java.net.Socket;/** * 测试Android客户端与PC服务器通过socket进行交互 * 服务器端：接收客户端的信息并回送给客户 * @author Ameyume * */public class Server implements Runnable {public static final String SERVERIP = "192.168.1.100";public static final int SERVERPORT = 51706;public void run() {try {System.out.println("S: Connecting...");ServerSocket serverSocket = new ServerSocket(SERVERPORT);while (true) {    // 等待接受客户端请求 Socket client = serverSocket.accept();System.out.println("S: Receiving...");try {    // 接受客户端信息BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));                    // 发送给客户端的消息                     PrintWriter out = new PrintWriter(new BufferedWriter(                    new OutputStreamWriter(client.getOutputStream())),true);                                        System.out.println("S: 111111");                    String str = in.readLine(); // 读取客户端的信息                    System.out.println("S: 222222");                    if (str != null ) {                    // 设置返回信息，把从客户端接收的信息再返回给客户端                    out.println("You sent to server message is:" + str);                    out.flush();                                        // 把客户端发送的信息保存到文件中                    File file = new File ("C://android.txt");                    FileOutputStream fops = new FileOutputStream(file);                     byte [] b = str.getBytes();                    for ( int i = 0 ; i < b.length; i++ )                    {                        fops.write(b[i]);                    }System.out.println("S: Received: '" + str + "'");                    } else {                    System.out.println("Not receiver anything from client!");                    }} catch (Exception e) {System.out.println("S: Error 1");e.printStackTrace();} finally {client.close();System.out.println("S: Done.");}}} catch (Exception e) {System.out.println("S: Error 2");e.printStackTrace();}}public static void main(String [] args ) {Thread desktopServerThread = new Thread(new Server());desktopServerThread.start();}}

2.客户端程序，运行在手机或者模拟器上。

import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.io.PrintWriter;import java.net.InetAddress;import java.net.Socket;import java.net.UnknownHostException;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;/** * 测试Android客户端与PC服务器通过socket进行交互 * 客户端：把用户输入的信息发送给服务器 * @author Ameyume * */public class Socket_Android extends Activity {private static final String TAG = "Socket_Android";private EditText mEditText = null;private TextView tx1 = null;private Button mButton = null;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                mButton = (Button)findViewById(R.id.Button01);        mEditText = (EditText)findViewById(R.id.etSendMsg);        tx1 = (TextView)findViewById(R.id.tx);                mButton.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubsetTitle("测试Socket连接");Socket socket = null;try {/* 指定Server的IP地址，此地址为局域网地址，如果是使用WIFI上网，则为PC机的WIFI IP地址 * 在ipconfig查看到的IP地址如下： * Ethernet adapter 无线网络连接:         * Connection-specific DNS Suffix  . : IP Address. . . . . . . . . . . . : 192.168.1.100 */InetAddress serverAddr = InetAddress.getByName("192.168.1.100");// TCPServer.SERVERIPLog.d("TCP", "C: Connecting...");// 应用Server的IP和端口建立Socket对象                    socket = new Socket(serverAddr, 51706);                    String message = "---Test_Socket_Android---";                        Log.d("TCP", "C: Sending: '" + message + "'");                                          // 将信息通过这个对象来发送给Server                      PrintWriter out = new PrintWriter(new BufferedWriter(                              new OutputStreamWriter(socket.getOutputStream())),                              true);                                            // 把用户输入的内容发送给server                    String toServer = mEditText.getText().toString();                    Log.d(TAG, "To server:'" + toServer + "'");                    out.println(toServer);                    out.flush();                                                              // 接收服务器信息                      BufferedReader in = new BufferedReader(                                  new InputStreamReader(socket.getInputStream()));                      // 得到服务器信息                      String msg = in.readLine();                    Log.d(TAG, "From server:'" + msg + "'");                    // 在页面上进行显示                      tx1.setText(msg);  } catch(UnknownHostException e) {Log.e(TAG, "192.168.1.100 is unkown server!");} catch(Exception e) {e.printStackTrace();} finally {try {socket.close();} catch(Exception e) {e.printStackTrace();}}}                });    }}

3.在客户端AndroidManifest.xml文件增加访问互联网的权限

<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.

本文参考自：Android通过socket连接服务器（PC）