简单的 websocket 和静态文件示例

Posted 2023-02-27

【中文标题】简单的 websocket 和静态文件示例

【英文标题】：Simple websocket and static file example

【发布时间】：2014-08-29 23:17:24

【问题描述】：

尝试设置 undertwo 来使用它，我正在尝试提供一个静态 html 文件 index.html 并添加我注释的 websocket ServerEndpoint pojo，所以我做了以下操作

final Xnio xnio = Xnio.getInstance("nio", Undertow.class.getClassLoader());
    final XnioWorker xnioWorker = xnio.createWorker(OptionMap.builder().getMap());

    WebSocketDeploymentInfo webSockets  = new WebSocketDeploymentInfo ()
           .addEndpoint(Socket.class)
           .setWorker(xnioWorker);

    final DeploymentManager deployment = defaultContainer()
            .addDeployment(deployment()
                    .setClassLoader(main.class.getClassLoader())
                    .setContextPath("/websockets")
                    .setDeploymentName("websockets")
                    .addServletContextAttribute(WebSocketDeploymentInfo.ATTRIBUTE_NAME, webSockets));

    deployment.deploy();
    deployment.start();


    Undertow.builder()
            .addHttpListener(8000,"localhost")
            .setHandler(path().addPrefixPath("/", resource(new ClassPathResourceManager(main.class.getClassLoader(), main.class.getPackage())).addWelcomeFiles("WSGSS/index.html")))
            .build()
            .start();

index.html 得到了预期的服务，但我似乎无法连接到 websocket，我确信我在部署 websocket 的方式上做错了，如果我按照 github 上的示例进行操作，它可以工作但后来我找不到提供静态文件的正确方法

在 javascript 中我得到了异常

var ws = new WebSocket("ws://localhost:8000/websockets/socket")

WebSocket connection to 'ws://localhost:8000/websockets/socket' failed: Error during WebSocket handshake: Unexpected response code: 404 

这里也是我的 ServerEndpoint

@ServerEndpoint(value = "/socket",
encoders = CommandEncoder.class,
decoders = CommandDecoder.class)
public class Socket

    private static final Set<Session> sessions = Collections.synchronizedSet(new HashSet<Session>());
    private final Logger log = Logger.getLogger(getClass().getName());

    @OnMessage
    public void onMessage(Session session,Command command)
        log.info("command of type "+ command.getAction() + " recieved");
        command.Process();
        try
            session.getBasicRemote().sendObject(command);
            //Future<Void> future = session.getAsyncRemote().sendText(message);
         catch (IOException | EncodeException ex)
            log.info(ex.getMessage() + ex.getCause());
        
    

    @OnOpen
    public void  onOpen(Session session)
        sessions.add(session);
        log.info("new session created "+ session.getId());
    

    @OnClose
    public void onClose(Session session)
        sessions.remove(session);
    

    @OnError void onError(Session session,Throwable thr)
        log.info(session.getId() + " error " + thr.getMessage() + thr.getCause());
    

【参考方案1】：

下面解决它

Undertow.builder()
            .addHttpListener(8000,"localhost")
            .setHandler(path()
                    .addPrefixPath("/", resource(new ClassPathResourceManager(main.class.getClassLoader(), main.class.getPackage())).addWelcomeFiles("WSGSS/index.html"))
                    .addPrefixPath("/websocket",manager.deployment()))
            .build()
            .start();