Android客户端和服务器端编程
作者：互联网
我正在尝试运行我在网上找到的服务器端和客户端示例.
这是服务器：
public class ServerActivity extends Activity {
private TextView serverStatus;
private TextView serverStatus2;
// DEFAULT IP
public static String SERVERIP = "10.100.102.15";
// 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.activity_server);
serverStatus = (TextView) findViewById(R.id.server_status);
serverStatus2 = (TextView) findViewById(R.id.server_status2);
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() {
serverStatus2.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 (final Exception e) {
handler.post(new Runnable() {
@Override
public void run() {
serverStatus.setText("Error" + e.getMessage());
}
});
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();
}
}
}
这是客户的代码：
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.activity_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) {
serverIpserverIpAddress = 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,
8080);
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;
}
}
}
}
当在同一个eclipse模拟器上运行上面的命令时,服务器抛出异常“Socket Closed”,甚至没有达到while循环“while(true)”.有人知道为什么吗？
这是控制台的输出：
Android Launch!
adb is running normally.
Performing com.example.server.ServerActivity activity launch
Automatic Target Mode: using existing emulator 'emulator-5554' running compatible AVD 'android2.3'
Uploading server.apk onto device 'emulator-5554'
Installing server.apk...
Success!
Starting activity com.example.server.ServerActivity on device emulator-5554
ActivityManager: Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.example.server/.ServerActivity }
------------------------------
Android Launch!
adb is running normally.
Performing com.example.client.ClientActivity activity launch
Automatic Target Mode: using existing emulator 'emulator-5554' running compatible AVD 'android2.3'
Application already deployed. No need to reinstall.
Starting activity com.example.client.ClientActivity on device emulator-5554
ActivityManager: Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.example.client/.ClientActivity }
这是LogCat输出：
08-08 13:04:38.165: D/ClientActivity(360): C: Connecting...
08-08 13:04:38.176: E/ClientActivity(360): C: Error
08-08 13:04:38.176: E/ClientActivity(360): java.net.ConnectException: /10.0.2.15:50907 - Connection refused
08-08 13:04:38.176: E/ClientActivity(360): at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:207)
08-08 13:04:38.176: E/ClientActivity(360): at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
08-08 13:04:38.176: E/ClientActivity(360): at java.net.Socket.startupSocket(Socket.java:705)
08-08 13:04:38.176: E/ClientActivity(360): at java.net.Socket.<init>(Socket.java:263)
08-08 13:04:38.176: E/ClientActivity(360): at com.example.client.ClientActivity$ClientThread.run(ClientActivity.java:58)
08-08 13:04:38.176: E/ClientActivity(360): at java.lang.Thread.run(Thread.java:1019)
08-08 13:04:40.456: W/IInputConnectionWrapper(360): showStatusIcon on inactive > > > InputConnection
解决方法:
解决了IT,http://developer.android.com/tools/devices/emulator.html.
问题是默认的android模拟器实例只能与自身和以太网交互,因此不同的实例不能相互联网.
如果要这样做,首先必须在实例中设置重定向.
阅读本页它有点像…很多：D
标签：android-networking,android,sockets 来源： https://codeday.me/bug/20190831/1777224.html