我正在使用从网站获得的以下代码在 android 中设置客户端服务器。一台 Android 平板电脑正在运行服务器代码，而另一台 Android 平板电脑正在运行客户端代码。该代码已完全粘贴，并且应该像对其他人一样有效，但是我无法让它在我的情况下工作。两台平板电脑都连接到wifi
人们告诉我为什么它不起作用有两个原因。提到的一个原因是我必须在我的路由器上设置端口转发，另一个经常提到的原因是我必须在服务器代码中设置不同的 IP 地址。但是我不知道要设置什么IP地址。
有任何想法吗？
服务器代码
public class ServerActivity extends Activity {
private TextView serverStatus;
// default ip
public static String SERVERIP = "10.0.2.15";
// designate a port
public static final int SERVERPORT = 8080;
private Handler handler = new Handler();
private ServerSocket serverSocket;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.server);
serverStatus = (TextView) findViewById(R.id.server_status);
SERVERIP = getLocalIpAddress();
Thread fst = new Thread(new ServerThread());
fst.start();
}
public class ServerThread implements Runnable {
public void run() {
try {
if (SERVERIP != null) {
handler.post(new Runnable() {
@Override
public void run() {
serverStatus.setText("Listening on IP: " + SERVERIP);
}
});
serverSocket = new ServerSocket(SERVERPORT);
while (true) {
// listen for incoming clients
Socket client = serverSocket.accept();
handler.post(new Runnable() {
@Override
public void run() {
serverStatus.setText("Connected.");
}
});
try {
BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
String line = null;
while ((line = in.readLine()) != null) {
Log.d("ServerActivity", line);
handler.post(new Runnable() {
@Override
public void run() {
// do whatever you want to the front end
// this is where you can be creative
}
});
}
break;
} catch (Exception e) {
handler.post(new Runnable() {
@Override
public void run() {
serverStatus.setText("Oops. Connection interrupted. Please reconnect your phones.");
}
});
e.printStackTrace();
}
}
} else {
handler.post(new Runnable() {
@Override
public void run() {
serverStatus.setText("Couldn't detect internet connection.");
}
});
}
} catch (Exception e) {
handler.post(new Runnable() {
@Override
public void run() {
serverStatus.setText("Error");
}
});
e.printStackTrace();
}
}
}
// gets the ip address of your phone's network
private String getLocalIpAddress() {
try {
for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
NetworkInterface intf = en.nextElement();
for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
InetAddress inetAddress = enumIpAddr.nextElement();
if (!inetAddress.isLoopbackAddress()) { return inetAddress.getHostAddress().toString(); }
}
}
} catch (SocketException ex) {
Log.e("ServerActivity", ex.toString());
}
return null;
}
@Override
protected void onStop() {
super.onStop();
try {
// make sure you close the socket upon exiting
serverSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
客户代码
public class ClientActivity extends Activity {
private EditText serverIp;
private Button connectPhones;
private String serverIpAddress = "";
private boolean connected = false;
private Handler handler = new Handler();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.client);
serverIp = (EditText) findViewById(R.id.server_ip);
connectPhones = (Button) findViewById(R.id.connect_phones);
connectPhones.setOnClickListener(connectListener);
}
private OnClickListener connectListener = new OnClickListener() {
@Override
public void onClick(View v) {
if (!connected) {
serverIpAddress = serverIp.getText().toString();
if (!serverIpAddress.equals("")) {
Thread cThread = new Thread(new ClientThread());
cThread.start();
}
}
}
};
public class ClientThread implements Runnable {
public void run() {
try {
InetAddress serverAddr = InetAddress.getByName(serverIpAddress);
Log.d("ClientActivity", "C: Connecting...");
Socket socket = new Socket(serverAddr, ServerActivity.SERVERPORT);
connected = true;
while (connected) {
try {
Log.d("ClientActivity", "C: Sending command.");
PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket
.getOutputStream())), true);
// where you issue the commands
out.println("Hey Server!");
Log.d("ClientActivity", "C: Sent.");
} catch (Exception e) {
Log.e("ClientActivity", "S: Error", e);
}
}
socket.close();
Log.d("ClientActivity", "C: Closed.");
} catch (Exception e) {
Log.e("ClientActivity", "C: Error", e);
connected = false;
}
}
}
}
日志输出
01-22 18:37:40.100: E/ClientActivity(19568): C: Error
01-22 18:37:40.100: E/ClientActivity(19568): java.net.ConnectException: failed to connect to /10.0.2.15 (port 8080): connect failed: EHOSTUNREACH (No route to host)
01-22 18:37:40.100: E/ClientActivity(19568): at libcore.io.IoBridge.connect(IoBridge.java:114)
01-22 18:37:40.100: E/ClientActivity(19568): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
01-22 18:37:40.100: E/ClientActivity(19568): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
01-22 18:37:40.100: E/ClientActivity(19568): at java.net.Socket.startupSocket(Socket.java:566)
01-22 18:37:40.100: E/ClientActivity(19568): at java.net.Socket.<init>(Socket.java:225)
01-22 18:37:40.100: E/ClientActivity(19568): at com.example.client.ClientActivity$ClientThread.run(ClientActivity.java:60)
01-22 18:37:40.100: E/ClientActivity(19568): at java.lang.Thread.run(Thread.java:856)
01-22 18:37:40.100: E/ClientActivity(19568): Caused by: libcore.io.ErrnoException: connect failed: EHOSTUNREACH (No route to host)
01-22 18:37:40.100: E/ClientActivity(19568): at libcore.io.Posix.connect(Native Method)
01-22 18:37:40.100: E/ClientActivity(19568): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:85)
01-22 18:37:40.100: E/ClientActivity(19568): at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
01-22 18:37:40.100: E/ClientActivity(19568): at libcore.io.IoBridge.connect(IoBridge.java:112)