Android学习笔记--通过wifi向服务器端发送数据
客户端程序：
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：
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();
}
}
