在Android中可以直接利用java中的Socket与ServerSocket构建socket通信。 代码的运行环境: pc端:普通pc,作为服务器,在5648端口进行监听。

代码运行一切正常,客户端发送的文字将在服务器端接收并显示,服务器每接收到客户端的一行文字,就会返回一个从0开始递增的整数,此整数将在客户端显示出来。 pc端代码:
package test; 
 
import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.OutputStream; 
import java.io.PrintWriter; 
import java.net.ServerSocket; 
import java.net.Socket; 
 
public class Test implements Runnable{ 
 
    /** 
     * @param args 
     */ 
 
    int max=10;      //最大开启线程数 
    int i=0;         //回复数字 
    int temp; 
    ServerSocket serverSocket; 
    Socket socket[]; 
 
    public Test(){ 
 
        try { 
            serverSocket=new ServerSocket(5648);    //在5648端口进行侦听 
        } catch (IOException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
            System.out.println("can't initate ServerSocket!"); 
            return; 
        } 
 
        socket=new Socket[max]; 
 
        System.out.println("waiting for connect"); 
        try { 
            while((socket[i]=serverSocket.accept())!=null){ 
                temp=i; 
                i++; 
                new Thread(this).start();           //每侦听到一个客户端的连接,就会开启一个工作线程 
 
            } 
        } catch (IOException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
        } 
    } 
    public static void main(String[] args) { 
        new Test(); 
 
    } 
 
    @Override 
    public void run() { 
        Socket sk=socket[temp]; 
        System.out.println("accept:"+sk.getInetAddress().getHostAddress()); 
        InputStream is=null; 
        OutputStream os=null; 
        BufferedReader br=null; 
        PrintWriter pw=null; 
        try { 
            is=sk.getInputStream(); 
            os=sk.getOutputStream(); 
            br=new BufferedReader(new InputStreamReader(is)); 
            pw=new PrintWriter(os); 
        } catch (IOException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
            try { 
                sk.close(); 
            } catch (IOException e1) { 
                // TODO Auto-generated catch block 
                e1.printStackTrace(); 
            } 
            return; 
        } 
        String str; 
        try { 
            int m=0; 
            while((str=br.readLine())!=null){ 
                System.out.println(str); 
                pw.println(m); 
                pw.flush(); 
                m++; 
            } 
        } catch (IOException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
        } 
 
    } 
 
} 

android设备客户端代码: MainActivity.java;代码:
import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.io.PrintWriter; 
import java.net.Socket; 
import java.net.UnknownHostException; 
 
import android.app.Activity; 
import android.os.Bundle; 
import android.os.Handler; 
import android.util.Log; 
import android.view.Menu; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Toast; 
 
public class MainActivity extends Activity implements OnClickListener,Runnable{ 
 
    private Button button; 
    private EditText editText; 
    private Socket socket; 
    private PrintWriter pw; 
    private BufferedReader br; 
    private Handler handler; 
 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.activity_main); 
        handler=new Handler(); 
        button=(Button)findViewById(R.id.button); 
        button.setOnClickListener(this); 
        editText=(EditText)findViewById(R.id.edittext); 
        try { 
            socket=new Socket("tobacco5648.xicp.net",5648);        //连接到tobacco5648.xicp.net的5648端口 
} catch (UnknownHostException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
            Log.e("socket","unknown host"); 
        } catch (IOException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
            Log.e("socket","io execption"); 
        } 
        if(socket==null){ 
            Log.e("socket","null"); 
        } 
        else 
            try { 
            pw=new PrintWriter(socket.getOutputStream()); 
            br=new BufferedReader(new InputStreamReader(socket.getInputStream())); 
            if(pw!=null&&br!=null){ 
                new Thread(this).start(); 
            } 
        } catch (IOException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
        } 
    } 
 
    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
        getMenuInflater().inflate(R.menu.activity_main, menu); 
        return true; 
    } 
 
    public void onClick(View view) { 
        if(view==button){ 
            String str; 
            str=editText.getText().toString(); 
            pw.println(str); 
            pw.flush(); 
        } 
 
    } 
 
    public void run() { 
 
        try { 
            String str; 
            while((str=br.readLine())!=null){ 
                final String s=str; 
                handler.post(new Runnable(){ 
 
                    public void run() { 
                        Toast.makeText(MainActivity.this, s, Toast.LENGTH_LONG).show(); 
 
                    }}); 
 
            } 
        } catch (IOException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
        } 
 
    } 
 
} 

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