java - 全双工服务器套接字实现，单独的读写线程？

Question

我想在同一个服务器套接字(java应用程序)上读取和写入(从服务器到客户端随机)。我的客户端到服务器的写入和读取在循环中工作得很好。在服务器上正确写入响应。

但是如果我尝试在服务器上随机写入一些命令。我没有解决方案，首先我的问题是:

1. 服务器端是否可以在同一套接字上向客户端 ramonly 写入命令？
2. 如果可能的话，有什么建议或指导如何做吗？
3. 请给我一些指示，我可以在哪里阅读有关此场景的 Material ？

提前致谢。

public class ContentServerSocket extends ServerSocket {
    private final static int PORT = 4444;

    protected static boolean XYZGONE = false;
    public static Content content;

    public ContentServerSocket(xyzService service) throws IOException {
        super(PORT);

        while (true) {

            Log.d(TAG, "Waiting for new request from client(content) ....");
            new HandleRequest(accept(), service).start();
        }
    }

    public static void xyzRunAway() {
        Log.d(TAG," Content Serv er 1 ");
        XYZGONE = true;
    }

}

class HandleRequest extends Thread {
    private final static String TAG = "ContentServerSocket:Thread for a request:";
    private Socket client;
    private xyzService service;

    private static  Context context;

    HandleRequest(Socket client, SuggestionService service) {
        this.client = client;
        this.service = service;
        context = xyzService.serviceContext();  
    }

    public void run() {
        while (true) {
            try {

                Log.d(TAG, " Step 1: client: Received request  MSG for Check...  ");
                PrintWriter out = new PrintWriter(client.getOutputStream(),
                        true);

                BufferedReader in = new BufferedReader(new InputStreamReader(
                        client.getInputStream(), "utf-8"));
                String request = "";
                String tmpLine = null;


                Log.d(TAG, " Step Xyz waiting data from the client ...  ");


                while ((tmpLine = in.readLine()) != null) {

                    if (tmpLine.length() > 0) {
                        request += tmpLine;
                        //if (tmpLine.toLowerCase().contains("</contentInfo>")) {
                        if (tmpLine.contains("</contentInfo>")) {
                            Log.d(TAG, " Server : broke because of </contentInfo>");
                            break;
                        }
                    } else {
                        Log.d(TAG, " Step NULL :   ");
                        request = "";
                    }

                } 



                Log.d("Robin", " Step 2: Actual request received from the client : : " + request);
                if (request.length() == 0) {
                    Log.d("Robin",
                            " client got 0 length request, thread stop!");
                    throw new Exception();

                }
                //XMLParser xmlParser = new XMLParser(new ByteArrayInputStream(
                //      request.getBytes("UTF-8")));

                Log.d(TAG, " Step 3 :   ");
                RequestParser readxmlrequest = new RequestParser(request);
                String requestType = readxmlrequest.parsingXmlRequestFromContent();
                Log.d(TAG, " Step 4  requestType :   " + requestType);


                //TODO : need to get the result and pas to the out.println..

                //String result = processXML(xmlParser);

                String result = responseToContentRequest(readxmlrequest,requestType);//null; //TODO need to complete.
                Log.d(TAG, " Step 5 result :   "+result);
                 (((((((((())))))))))";
                if (result != null && result.length() > 0) {

                    //oos.writeObject(result);
                    Log.d("Robin", " Writing response to socket ... ");
                    out.println(result + "\n");
                    out.flush();
                    Log.d("Robin", " Writing flush completed ");
                }

                if(ContentServerSocket.XYZGONE) {
                    Log.d(TAG," XYZGONE >>>>>>>> ");
                    ContentServerSocket.XYZGONE = false;
                    String tmp = "<ssr> OK Done .......</ssr>";
                    out.println(tmp + "\n");
                    Log.d("Content Server Socket ", "xyz:" + tmp);
                    out.flush();
                }

            } catch (IOException ioException) {
                Log.d("Robin", " IOException on socket listen: " + ioException);
            }
            catch (Exception e) {
                Log.d("Robin", " outer exception: " + e.toString());
                break;
            }

            finally {
                if (client == null || client.isClosed()
                        || !client.isConnected()) {
                    Log.d(" Robin ", " client is null");
                    break;
                }
            }
            //break;

            }
        Log.d("Robin", " thread stop... ");
    }

Answer 1

所以，我修复了它。我只需要维护两个不同的线程。1)阅读。2)写入。

在上面的代码中，我刚刚又启动了一个用于写入的线程。

在上述代码的Run函数中插入代码。

================================================== =====

Runnable r1 = new Runnable() {
    public void run() {
            try {
            while (true) {
                System.out.println("Hello, world!");
                if(ContentServerSocket.XYZGONE) {
                    Log.d(TAG," XYZGONEY >>>>>>>> ");
                    ContentServerSocket.XYZGONE = false;
                    String tmp = "<ssr> OK Done .......</ssr>";
                    out.println(tmp + "\n");
                    Log.d("Content Server Socket ", "XYZGONE :" + tmp);
                    out.flush();
                }
                Thread.sleep(1000L);
            }
        } catch (InterruptedException iex) {}
    }
};

Thread thr1 = new Thread(r1);

======================================

然后在read的wile循环中启动线程。使用以下带有检查的代码。

======================================

if(!thr1.isAlive())thr1.start();

谢谢大家回答我的问题..