首页 文章

Android TCP服务器客户端通信

提问于
浏览 次
8

我在android上找到了一个写得很好的教程here用于服务器客户端通信 . 奇迹般有效 . 但这只是一种沟通方式 . 我试图在客户端听服务器响应，但不知道我在哪里错了 . 这是我试图进行更改的服务器代码 .

Server

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");

        }

    }

}

Client

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();
            }

        }

    }
}

Update

当客户端向服务器发送任何消息时，服务器会收到消息，但是当服务器发送其响应时

BufferedWriter out = new BufferedWriter(new OutputStreamWriter(clientSocket.getOutputStream()));
 out.write("TstMsg");

并在客户端

String read = in.readLine();
System.out.println("MSG:" + read);

它没有收到客户端或我们可以说服务器监听客户端消息但客户端没有 . 我在清单中添加了两个权限 .

<uses-permission android:name="android.permission.INTERNET" >
</uses-permission>

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" >
</uses-permission>

更新长时间挂起后会出现这些错误 .

11-28 18:35:45.786: E/GTalkService(292): connectionClosed: no XMPPConnection - That's strange!
11-28 18:35:48.806: D/ConnectivityService(148): handleInetConditionHoldEnd: net=1, condition=0, published condition=0
11-28 18:35:54.526: I/GTalkService/c(292): [AndroidEndpoint@1090563472] connect: acct=1000000, state=CONNECTING
11-28 18:35:55.176: D/dalvikvm(1167): GC_CONCURRENT freed 495K, 9% free 6604K/7239K, paused 2ms+3ms
11-28 18:35:55.226: D/Finsky(1167): [1] 5.onFinished: Installation state replication succeeded.
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349): Problem with socket or streams.
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349): java.net.ConnectException: failed to connect to www.google-analytics.com/173.194.39.41 (port 80): connect failed: ETIMEDOUT (Connection timed out)
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349):  at libcore.io.IoBridge.connect(IoBridge.java:114)
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349):  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349):  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349):  at java.net.Socket.connect(Socket.java:842)
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349):  at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349):  at com.google.android.apps.analytics.t.run(Unknown Source)
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349):  at android.os.Handler.handleCallback(Handler.java:605)
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349):  at android.os.Handler.dispatchMessage(Handler.java:92)
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349):  at android.os.Looper.loop(Looper.java:137)
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349):  at android.os.HandlerThread.run(HandlerThread.java:60)
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349): Caused by: libcore.io.ErrnoException: connect failed: ETIMEDOUT (Connection timed out)
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349):  at libcore.io.Posix.connect(Native Method)
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349):  at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:85)
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349):  at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349):  at libcore.io.IoBridge.connect(IoBridge.java:112)
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349):  ... 9 more
11-28 18:37:29.016: D/dalvikvm(349): GC_CONCURRENT freed 1258K, 35% free 8238K/12487K, paused 2ms+8ms
java android sockets tcp

6 回答

  • 0

    readLine（）需要一个实际的行：'一行被认为是由换行符（'\ n'），回车符（'\ r'）或回车符后面的任何一行终止的 . “

    因此你应该发送一个，例如 . 使用BufferedWriter.newLine（） .

    回复于
  • 0

    我仍然不确定你想要实现的目标 . 您的错误-log显示XMPPConnection - 错误 . XMPP不会通过您在发布的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其他部分 . 其他错误消息与HTTP - Google for Google Analytics的分析相关，并且都与您发布的代码段无关 . 您应该通过以下方式来解决您的问题：捕获可能的异常，使用标记的Log.d可以过滤您的错误 - 消息 . 我认为马丁詹姆斯的暗示是好的，所以如果从服务器接收到任何数据，那么尝试切换到输入流的字节读取至少用于验证和下降 - 连接也是一个好主意 .

    回复于
  • 1

    您是否在代码中编写了以下代码段？

    out.flush();

    后

    BufferedWriter out = new BufferedWriter(new OutputStreamWriter(clientSocket.getOutputStream()));
out.write("TstMsg");
    回复于
  • -6

    尝试写时是否尝试添加新行（ "\n" ）？请尝试使用 out.write("TstMsg"+ "\n") .

    回复于
  • -1
    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();
    回复于
  • 1

    如果您尝试连接到Web服务器 . 据我所知，Web服务器处理http协议，你试图使用socket使用tcp / ip连接到web服务器 . 由于违反协议标准，您将无法获得预期的响应 . 您可以选择连接到Web服务器，或者使用android HttpURLConnection相关类，或者使用任何编程语言中的severSocket相关类来创建自己的应用程序服务器来处理您的客户端 .

    回复于

相关问题