java Android TCP服务器客户端通信

1 年，4 月 Questions & Answers 47479

我找到了一本关于安卓上服务器-客户端通信的编写良好的教程here。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;

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

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

更新经过长时间的等待，这些错误就会出现

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.安卓.apps.analytics.t.run(Unknown Source)
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349):  at 安卓.os.Handler.handleCallback(Handler.java:605)
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349):  at 安卓.os.Handler.dispatchMessage(Handler.java:92)
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349):  at 安卓.os.Looper.loop(Looper.java:137)
11-28 18:37:18.276: W/GoogleAnalyticsTracker(349):  at 安卓.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

共 (6) 个答案

# 1 楼答案

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();

# 2 楼答案

readLine（）需要实际的一行：“一行被认为是由换行符（'\n'）、回车符（'\r'）或紧跟着换行符的回车符中的任何一个终止的。”

因此，您应该发送一个，例如使用BufferedWriter。换行符（）
# 3 楼答案

您在尝试写入时是否尝试添加新行（"\n"）？试试out.write("TstMsg"+ "\n")
# 4 楼答案

如果您正在尝试连接到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

# 5 楼答案

您是否在代码中编写了以下代码片段

out.flush();

之后

# 6 楼答案

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、记录来跟踪您的问题。你可以用一个标签过滤你的错误信息。我认为Martin James的提示很好，因此，如果您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

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java Android TCP服务器客户端通信

共 (6) 个答案

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# 3 楼答案

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