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() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
setTitle("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.SERVERIP
Log.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）