Java Android TCP服务器客户端通信
我发现了一个关于android上服务器-客户端通信的编写良好的教程。工作起来很有魅力。但这只是一种交流方式。我试图在客户机中侦听服务器响应,但不知道我错在哪里。这是我试图更改的服务器的代码 服务器Java Android TCP服务器客户端通信,java,android,sockets,tcp,Java,Android,Sockets,Tcp,我发现了一个关于android上服务器-客户端通信的编写良好的教程。工作起来很有魅力。但这只是一种交流方式。我试图在客户机中侦听服务器响应,但不知道我错在哪里。这是我试图更改的服务器的代码 服务器 public class Server extends Activity { private ServerSocket serverSocket; Handler updateConversationHandler; Thread serverThread = null;
public class Server extends Activity {
private ServerSocket serverSocket;
Handler updateConversationHandler;
Thread serverThread = null;
private TextView text;
public static final int SERVERPORT = 8080;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
text = (TextView) findViewById(R.id.text2);
updateConversationHandler = new Handler();
this.serverThread = new Thread(new ServerThread());
this.serverThread.start();
}
@Override
protected void onStop() {
super.onStop();
try {
serverSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
class ServerThread implements Runnable {
public void run() {
Socket socket = null;
try {
serverSocket = new ServerSocket(SERVERPORT);
} catch (IOException e) {
e.printStackTrace();
}
while (!Thread.currentThread().isInterrupted()) {
try {
socket = serverSocket.accept();
CommunicationThread commThread = new CommunicationThread(socket);
new Thread(commThread).start();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
class CommunicationThread implements Runnable {
private Socket clientSocket;
private BufferedReader input;
public CommunicationThread(Socket clientSocket) {
this.clientSocket = clientSocket;
try {
this.input = new BufferedReader(new InputStreamReader(this.clientSocket.getInputStream()));
} catch (IOException e) {
e.printStackTrace();
}
}
public void run() {
while (!Thread.currentThread().isInterrupted()) {
try {
String read = input.readLine();
if (read == null ){
Thread.currentThread().interrupt();
}else{
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(clientSocket.getOutputStream()));
out.write("TstMsg");
updateConversationHandler.post(new updateUIThread(read));
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
class updateUIThread implements Runnable {
private String msg;
public updateUIThread(String str) {
this.msg = str;
}
@Override
public void run() {
text.setText("Client Says: "+ msg + new Date() + "\n");
}
}
}
客户端
public class Client extends Activity {
private Socket socket;
private static final int SERVERPORT = 8080;
private static final String SERVER_IP = "192.168.104.107";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
new Thread(new ClientThread()).start();
}
public void onClick(View view) {
try {
EditText et = (EditText) findViewById(R.id.EditText01);
String str = et.getText().toString();
PrintWriter out = new PrintWriter(new BufferedWriter(
new OutputStreamWriter(socket.getOutputStream())),
true);
out.println(str);
out.flush();
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
String read = in.readLine();
System.out.println("MSG:" + read);
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
class ClientThread implements Runnable {
@Override
public void run() {
try {
InetAddress serverAddr = InetAddress.getByName(SERVER_IP);
socket = new Socket(serverAddr, SERVERPORT);
} catch (UnknownHostException e1) {
e1.printStackTrace();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
}
更新
当客户端向服务器发送任何消息时,服务器会接收到该消息,但当服务器发送其响应时
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(clientSocket.getOutputStream()));
out.write("TstMsg");
和客户
String read = in.readLine();
System.out.println("MSG:" + read);
它没有被客户端接收,或者我们可以说服务器监听客户端消息,但客户端没有。
我已在清单中添加了这两个权限
<uses-permission android:name="android.permission.INTERNET" >
</uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" >
</uses-permission>
我仍然不确定你想要实现什么。错误日志显示XMPPConnection-error。XMPP不会通过您在发布代码中使用的端口进行处理,因此此错误消息可能来自应用程序的不同部分。 另一条错误消息与Google analytics的HTTP连接有关,与您发布的代码片段都不相关。 您应该通过捕获可能的异常、使用标记Log.d来跟踪您的问题,您可以通过标记筛选错误消息。 我认为Martin James的提示很好,因此,如果从服务器连接收到任何数据,尝试切换到按字节读取inputstream(至少用于验证和向下跟踪)也是一个好主意。readLine()需要实际的一行:“一行被认为是由任何一个换行符('\n')终止的,”,回车符('\r'),或紧接着换行符的回车符。'
因此,您应该发送一个,例如使用BufferedWriter.newLine()
out.flush();
之后
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(clientSocket.getOutputStream()));
out.write("TstMsg");
尝试写入时是否尝试添加新行(
“\n”
)?尝试输出。改为写入(“TstMsg”+“\n”)
如果您试图连接到web服务器。据我所知,web服务器处理http协议,您正在尝试使用套接字通过tcp/ip连接到web服务器。您将不会得到预期的响应,因为您违反了协议标准。如果您想连接到web服务器,您可以选择使用android HttpURLConnection相关类,或者使用任何编程语言中的severSocket相关类创建自己的应用程序服务器来处理客户端
final Socket s = new Socket();
s.connect(new InetSocketAddress(mHost, mPort), 20000);
final DataOutputStream dos = new DataOutputStream(s.getOutputStream());
dos.write(("This is a message." + "\r\n").getBytes());
dos.flush();
或者:
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
String outgoingMsg = "This is a message." + System.getProperty("line.separator");
out.write(outgoingMsg);
out.flush();
你在两个项目中都提供了互联网许可吗???什么,你的问题,好好解释一下,你说它很有魅力,但不知道问题在哪里。谢谢你的兴趣,我更新了这个问题。嘿,链接上的教程很棒。但我们如何在真正的android设备上运行这些代码呢?不在模拟器中。那端口转发呢?我已经添加了整个类,我首先尝试添加“\n”,但这也不起作用。我又试了一次,添加了新的行。但客户端在从服务器接收响应时挂起,在长时间挂起后,它只返回一堆错误。我更新了堆栈跟踪。
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
String outgoingMsg = "This is a message." + System.getProperty("line.separator");
out.write(outgoingMsg);
out.flush();