websocket客户端无法连接到服务器

Question

我正在使用gwt-web-sockets-1.0.0.jar在我的电脑上的GWT示例中实现一个简单的websocket。 我在各种浏览器中尝试过，在所有浏览器中我都看到了错误或关闭处理程序。

这是我的代码：

public class WebSocketView extends Composite{

private WebSocket webSocket;
private TextBox url;
private TextBox input;
private Button connect;
private Button disconnect;

...

url = new TextBox();
url.setValue("ws://127.0.0.1:8080/sample/websocket/Test");
input = new TextBox();
input.setValue("Hello World!");

connect = new Button("Connect", new ClickHandler() {
    @Override
    public void onClick(ClickEvent event) {
        connect();
    }
});
disconnect = new Button("Disconnect", new ClickHandler() {
    @Override
    public void onClick(ClickEvent event) {
        webSocket.close();
    }
});

send = new Button("Send", new ClickHandler() {
    @Override
    public void onClick(ClickEvent event) {
        webSocket.send(input.getValue());
    }
});

...

public void connect() {
try {
    webSocket = create(url.getValue());
    webSocket.setOnOpen(new OpenHandler() {
        @Override
        public void onOpen(WebSocket webSocket) {
            GWT.log("opened successfully");
        }
    });
    webSocket.setOnClose(new CloseHandler() {
        @Override
        public void onClose(WebSocket webSocket) {
            GWT.log("closed");
        }
    });
    webSocket.setOnError(new ErrorHandler() {
        @Override
        public void onError(WebSocket webSocket) {
            GWT.log("error");
        }
    });
    webSocket.setOnMessage(new MessageHandler() {
        @Override
        public void onMessage(WebSocket webSocket, MessageEvent event) {
            GWT.log("having message");
        }
    });
} catch (JavaScriptException e) {
    output(e.toString(), "red");
}
}

public static native WebSocket create(String url) /*-{
        return new WebSocket(url);
    }-*/;
}

web.xml servlet定义：

<servlet>
    <servlet-name>myWebSocket</servlet-name>
    <servlet-class>ir.myCompany.sample.server.websocket.MyWebSocketServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>myWebSocket</servlet-name>
    <url-pattern>/sample/websocket/Test</url-pattern>
</servlet-mapping>

服务器端代码：

public class MyWebSocketServlet extends WebSocketServlet {

private static final long serialVersionUID = 1L;
ChatMessageInbound chatMessageInbound = new ChatMessageInbound();

public MyWebSocketServlet() {
    System.out.println("constructor called!");
}

@Override
protected StreamInbound createWebSocketInbound(String arg0, HttpServletRequest arg1) {
    System.out.println(arg0);
    return chatMessageInbound;
}

}