参见英文答案 > Java Socket why server can not reply client                                    4个
我一直在尝试各种实现来完成这项工作,并且已经搜索了*和Android开发人员以获得解决方案,但我在编程方面没有太多经验,并且不能让这个块能够使代码正常工作.

我的意图：

>这是一个循环检查是否有outMessage的线程,如果有,它将发送消息.
>接下来它将检查它是否在插播中有任何内容,如果有,它将把它发送到我的主要活动中的处理程序.
>最后,它将睡眠1秒钟,然后再次检查.
>这应该允许我多次读/写,而无需关闭和打开套接字.

问题：

>在关闭套接字之前,流不会被刷新. flush()似乎没有效果.

我的请求：

>请发布所需的更改,以使此代码正常工作,如上所述(任何注释解释为什么会非常感激.链接到其他类似的问题/答案将很好,以帮助我学习,但我一直在寻找这些几个星期,只是不能让它工作,所以请确保您还包括更改此代码需要,以便如上所述工作.提前感谢.

其他：

>我想知道我的内流和/或外流是否需要寻找行尾字符？
>这里会使用像TCP_NODELAY这样的东西吗？
>非常感谢任何额外的信息.我想好好学习这些东西,但我目前无法得到任何工作.

码：

 public void run() {                        
        while (connectionStatus == TCP_SOCKET_STATUS_CONNECTED) {
            try {   
                if (outMessage != null){
                   OutStream.writeBytes(outMessage);
                   OutStream.flush();           
                   outMessage = ("OUT TO SERVER: " + outMessage);           
                // socketClient.close();     
                   sendMessageToAllUI(0, MAINACTIVITY_SET_TEXT_STATE, "appendText" , outMessage);
                   outMessage = null;               
                } 
                if (InStream != null) {                     
                    String modifiedSentence = InStream.readLine();      
                    sendMessageToAllUI(0, MAINACTIVITY_SET_TEXT_STATE, "appendText" , "\n" + "IN FROM SERVER: " + modifiedSentence);
            }
            Thread.sleep(1000);
        } catch (IOException e) {               
            connectionLost();
            break;
        } catch (InterruptedException e) {
                e.printStackTrace();
            }
    }                           
}

创建套接字的线程：

public void run() {
        if(I) Log.i(LOGTAG, "Attempt Connection with IP: " + serverIP + " ...");
        setName("AttemptConnectionThread");
        connectionStatus = TCP_SOCKET_STATUS_CONNECTING;
        try {
            SocketAddress sockaddr = new InetSocketAddress(serverIP, port);
            tempSocketClient = new Socket(); // Create an unbound socket

            // This method will block no more than timeoutMs. If the timeout occurs, SocketTimeoutException is thrown.
            tempSocketClient.connect(sockaddr, timeoutMs);
            OutStream = new DataOutputStream(tempSocketClient.getOutputStream());
            InStream = new BufferedReader(new InputStreamReader(tempSocketClient.getInputStream()));
            socketClient = tempSocketClient;
            socketClient.setTcpNoDelay(true);
            connected(); 
        } catch (UnknownHostException e) {
            if(I) Log.i(LOGTAG,"     ...UnknownException e: e.getMessage() shows: " + e.getMessage());
            connectionFailed();
        } catch (SocketTimeoutException e) {
            if(I) Log.i(LOGTAG,"     ...SocketTimoutException e: e.getMessage() shows: " + e.getMessage());
            connectionFailed();
        } catch (IOException e) {
            if(I) Log.i(LOGTAG,"     ...caught on run()");
            // Close the socket
            try {
                tempSocketClient.close();
            } catch (IOException e2) {
                Log.e(LOGTAG, "unable to close() socket during connection failure", e2);
            }
            if(I) Log.i(LOGTAG,"     ...IOException e: e.getMessage() shows: " + e.getMessage());
            connectionFailed();
            return;
        }
    } 

我在网上找到并使用的java服务器,直到我将其移植到真实服务器上：

public class Server {

private static String SERVERIP;

/**
 * @param args
 * @throws IOException
 */

public static void main(String[] args) throws IOException {
    String clientSentence;
    String capitalizedSentence;

    try {
        ServerSocket welcomeSocket = new ServerSocket(8888);
        getIp();
        System.out.println("Connected and waiting for client input!\n");

        while (true) {
            Socket connectionSocket = welcomeSocket.accept();
            BufferedReader inFromClient = new BufferedReader(
                    new InputStreamReader(connectionSocket.getInputStream()));
            DataOutputStream outToClient = new DataOutputStream(
                    connectionSocket.getOutputStream());

            clientSentence = inFromClient.readLine();
            String ip = connectionSocket.getInetAddress().toString()
                    .substring(1);
            System.out.println("In from client (" + ip + "): "
                    + clientSentence);
            if (clientSentence != null) {
                capitalizedSentence = clientSentence.toUpperCase() + '\n';
                System.out.println("Out to client (" + ip + "): "
                        + capitalizedSentence);
                outToClient.writeBytes(capitalizedSentence + "\n");
            }

        }
    } catch (IOException e) {
        // if server is already running, it will not open new port but
        // instead re-print the open ports information
        getIp();
        System.out
                .println("Server connected and waiting for client input!\n");

    }
}

private static void getIp() {
    InetAddress ipAddr;
    try {
        ipAddr = InetAddress.getLocalHost();
        System.out.println("Current IP address : "
                + ipAddr.getHostAddress());

    } catch (UnknownHostException e) {
        e.printStackTrace();
    }
}
}

解决方法:

我怀疑你正在阅读消费者的行,但你不是在写行,所以消费者阻止它直到它获得EOS并提供一个大线.根据需要在发送时添加行终止符.