（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(); } } } |
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(); } } |