(转自http://www.cnblogs.com/zhxiang/archive/2011/07/21/2112825.html)

客户端程序:

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package com.zx.android; 
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; 
import android.content.Context; 
import android.widget.Toast; 
import java.io.BufferedReader; 
import java.io.BufferedWriter; 
import java.io.InputStreamReader; 
import java.io.OutputStreamWriter; 
import java.io.PrintWriter; 
import android.net.wifi.WifiManager; 
import java.net.Socket; 
import com.zx.android.ClientActivity; 
public class ClientActivity extends Activity { 
    /** Called when the activity is first created. */ 
    private Button startButton = null
     private Button stopButton = null
     private Button checkButton = null
     private WifiManager wifiManager = null
     private final String   DEBUG_TAG= "Activity01"
     private TextView   mTextView=null
     private EditText   mEditText=null
     private Button     mButton=null
   
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.main); 
        mButton = (Button)findViewById(R.id.Button01); 
        mTextView=(TextView)findViewById(R.id.TextView01); 
        mEditText=(EditText)findViewById(R.id.EditText01); 
      startButton = (Button)findViewById(R.id.startWifi); 
      stopButton = (Button)findViewById(R.id.stopWifi); 
      checkButton = (Button)findViewById(R.id.checkWifi); 
      startButton.setOnClickListener(new StartWifiListener()); 
      stopButton.setOnClickListener(new StopWifiListener()); 
      checkButton.setOnClickListener(new CheckWifiListener()); 
     
    //登陆 
    mButton.setOnClickListener(new OnClickListener() 
    
        public void onClick(View v) 
        
            Socket socket = null
            String message = mEditText.getText().toString() + "/r/n";  
            try  
            {    
                //创建Socket 
                socket = new Socket("192.168.1.102",54321);  
                //向服务器端发送消息 
                PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(socket.getOutputStream())),true);       
                out.println(message);  
                   
                //接收来自服务器端的消息 
                BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));  
                String msg = br.readLine();  
                   
                if ( msg != null
                
                    mTextView.setText(msg); 
                
                else 
                
                    mTextView.setText("数据错误!"); 
                
                //关闭流 
                out.close(); 
                br.close(); 
                //关闭Socket 
                socket.close();  
            
            catch (Exception e)  
            
                // TODO: handle exception 
                Log.e(DEBUG_TAG, e.toString()); 
            
        
    }); 
  class StartWifiListener implements OnClickListener{ 
      public void onClick(View v) { 
       wifiManager = (WifiManager)ClientActivity.this.getSystemService(Context.WIFI_SERVICE); 
       wifiManager.setWifiEnabled(true); 
       System.out.println("wifi state --->" + wifiManager.getWifiState()); 
       Toast.makeText(ClientActivity.this, "当前Wifi网卡状态为" +  
    wifiManager.getWifiState(), Toast.LENGTH_SHORT).show(); 
      
        
  class StopWifiListener implements OnClickListener{ 
      public void onClick(View arg0) { 
       wifiManager = (WifiManager)ClientActivity.this.getSystemService(Context.WIFI_SERVICE); 
       wifiManager.setWifiEnabled(false); 
       System.out.println("wifi state --->" + wifiManager.getWifiState()); 
       Toast.makeText(ClientActivity.this, "当前Wifi网卡状态为" +  
    wifiManager.getWifiState(), Toast.LENGTH_SHORT).show(); 
      
           
        
           
  class CheckWifiListener implements OnClickListener{ 
      public void onClick(View v) { 
       wifiManager = (WifiManager)ClientActivity.this.getSystemService(Context.WIFI_SERVICE); 
       System.out.println("wifi state --->" + wifiManager.getWifiState()); 
       Toast.makeText(ClientActivity.this, "当前Wifi网卡状态为" +  
    wifiManager.getWifiState(), Toast.LENGTH_SHORT).show(); 
      
            
        
}

0_13090842637boz

    这个是我在手机上运行时截的图,下面三个按钮是操作wifi网关的按钮,下面的那个提示框是按下这个按钮出现的,数字为0表示正在关闭wifi,数字2表示正在开启wifi,数字1表示wifi处于关闭状态,数字3表示 wifi处于开启状态。

      上面的的发送按钮可以发送数据到服务器,实验室的是局域网,没有无线网络,我利用一个无线路由与电脑相连,在利用手机wifi搜索到该网络,手机与电脑构 成局域网,便可发送数据。至于服务器端,可以采用网络调试助手接收数据,协议选择TCP服务器,ip地址和端口视自己情况定。

       当然也可以自己写个服务器端程序,再在命令行窗口中显示接收到的数据。

服务器端程序:

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package com.zx.android; 
import java.io.BufferedReader; 
import java.io.BufferedWriter; 
import java.io.InputStreamReader; 
import java.io.OutputStreamWriter; 
import java.io.PrintWriter; 
import java.net.ServerSocket; 
import java.net.Socket; 
public class Server implements Runnable 
    public void run() 
    
        try 
        
            //创建ServerSocket 
            ServerSocket serverSocket = new ServerSocket(54321); 
            while (true
            
                //接受客户端请求 
                Socket client = serverSocket.accept(); 
                System.out.println("accept"); 
                try 
                
                    //接收客户端消息 
                    BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream())); 
                    String str = in.readLine(); 
                    System.out.println("read:" + str);     
                    //向服务器发送消息 
                    PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(client.getOutputStream())),true);       
                    out.println("server message");  
                    //关闭流 
                    out.close(); 
                    in.close(); 
                
                catch (Exception e) 
                
                    System.out.println(e.getMessage()); 
                    e.printStackTrace(); 
                
                finally 
                
                    //关闭 
                    client.close(); 
                    System.out.println("close"); 
                
            
        
        catch (Exception e) 
        
            System.out.println(e.getMessage()); 
        
    
    //main函数,开启服务器 
    public static void main(String[] args) 
    
        Thread desktopServerThread = new Thread(new Server()); 
        desktopServerThread.start(); 
    
}