Question

Java代码我制作跨平台并需要使用javascript打开套接字从智能手表发送到计算机我需要发送数据的帮助我打开了连接，但可以发送任何数据

   public class ChatSocketServer {
    private ServerSocket severSocket = null;
    private Socket socket = null;
    private InputStream inStream = null;
    private OutputStream outStream = null;

    public ChatSocketServer() {

    }

    public void createSocket() {
        try {
            ServerSocket serverSocket = new ServerSocket(3339);
            while (true) {
                socket = serverSocket.accept();
                inStream = socket.getInputStream();
                outStream = socket.getOutputStream();
                System.out.println("Connected");
                createReadThread();
                createWriteThread();

            }
        } catch (IOException io) {
            io.printStackTrace();
        }
    }

    public void createReadThread() {
        Thread readThread = new Thread() {
            public void run() {
                while (socket.isConnected()) {
                    try {
                        byte[] readBuffer = new byte[200];
                        int num = inStream.read(readBuffer);
                        if (num > 0) {
                            byte[] arrayBytes = new byte[num];
                            System.arraycopy(readBuffer, 0, arrayBytes, 0, num);
                            String recvedMessage = new String(arrayBytes, "UTF-8");
                            System.out.println("Received message :" + recvedMessage);
                        } else {
                            notify();
                        }
                        ;
                        //System.arraycopy();

                    } catch (SocketException se) {
                        System.exit(0);


                    } catch (IOException i) {
                        i.printStackTrace();
                    }


                }
            }
        };
        readThread.setPriority(Thread.MAX_PRIORITY);
        readThread.start();
    }

    public void createWriteThread() {
        Thread writeThread = new Thread() {
            public void run() {

                while (socket.isConnected()) {
                    try {
                        BufferedReader inputReader = new BufferedReader(new InputStreamReader(System.in));
                        sleep(100);
                        String typedMessage = inputReader.readLine();
                        if (typedMessage != null && typedMessage.length() > 0) {
                            synchronized (socket) {
                                outStream.write(typedMessage.getBytes("UTF-8"));
                                sleep(100);
                            }
                        }/* else {
                           notify();
                       }*/
                        ;
                        //System.arraycopy();

                    } catch (IOException i) {
                        i.printStackTrace();
                    } catch (InterruptedException ie) {
                        ie.printStackTrace();
                    }


                }
            }
        };
        writeThread.setPriority(Thread.MAX_PRIORITY);
        writeThread.start();

    }

    public static void main(String[] args) {
        ChatSocketServer chatServer = new ChatSocketServer();
        chatServer.createSocket();

    }
}

我使用的Javascript代码可能使用javascript和html5

   function PowerPowintSend() {

var webSocket = new WrapperWS();
webSocket.send("asdasdasdasd");

}

function WrapperWS() {
    if ("WebSocket" in window) {
        var ws = new WebSocket('ws://localhost:3339');
        var self = this;

        ws.onopen = function () {
            console.log("Opening a connection...");
            window.identified = false;
        };
        ws.onclose = function (evt) {
            console.log("I'm sorry. Bye!");
        };
        ws.onmessage = function (evt) {
             console.log(evt);
        };
        ws.onerror = function (evt) {
            console.log("ERR: " + evt.data);
        };

        this.write = function () {
            if (!window.identified) {
                connection.ident();
                console.debug("Wasn't identified earlier. It is now.");
            }
            ws.send(theText.value);
        };

        this.send = function (message, callback) {
            this.waitForConnection(function () {    
                ws.send(message);
                if (typeof callback !== 'undefined') {
                  callback();
                }
            }, 1000);
        };

        this.waitForConnection = function (callback, interval) {
            if (ws.readyState === 1) {
                callback();
            } else {
                var that = this;
                // optional: implement backoff for interval here
                setTimeout(function () {
                    that.waitForConnection(callback, interval);
                }, interval);
            }
        };

        this.ident = function () {
            var session = "Test";
            try {
                ws.send(session);
            } catch (error) {
                if (error instanceof InvalidStateError) {
                    // possibly still 'CONNECTING'
                    if (ws.readyState !== 1) {
                        var waitSend = setInterval(ws.send(session), 1000);
                    }
                }
            }
        window.identified = true;
            theText.value = "Hello!";
            say.click();
            theText.disabled = false;
        };

    };

}

Answer 1

webSocket连接不是通用套接字连接。它运行在TCP套接字上，但是它通过HTTP连接，然后升级到webSocket协议，包括交换一些安全凭证，然后它说出具有特定webSocket数据包格式的特定webSocket协议。

因此，您无法在浏览器的webSocket和Java中的普通套接字服务器之间进行通信。相反，您需要Java端的webSocket服务器。您需要一台知道如何说出webSocket连接顺序和协议的服务器。 Java中有许多webSocket服务器实现。这里是one，this post中提到了几个。我可能会看到使用Jetty的人最多的引用，但我不是Java高手，所以我没有具体的推荐。

为了让您了解webSocket协议的工作原理，您可以看到Writing WebSocket Servers。

此外，这可能有助于解释：What's the difference between WebSocket and plain socket communication?

Answer 2

使用javacript打开Webscoket时，它会发送类似的数据

Connected
Received message :GET / HTTP/1.1
Host: localhost:3339
Connection: Upgrade
Pragma: no-cache
Cache-Control: no-cache
Upgrade: websocket
Origin: file://
Sec-WebSocket-Version: 13
User-Agent: Mozilla/5.0 (Windows N
Received message :T 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.111 Safari/537.36
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-US,en;q=0.8,ar;q=0.6
Sec-WebSocket-Key: 1udKsf4w0jKj
Received message :OC0/0uIwFQ==
Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits

无法从Web Socket向Java Scoket发送任何数据

2 个答案: