WebSocket握手过程中出错

我正试图按照本教程中给出的说明，在Netbeans中创建一个示例应用程序。我已到达测试部分。当我在chrome中运行应用程序时，它显示

到的WebSocket连接"ws://localhost:8080/WhiteboardApp/whiteboardendpoint"失败：错误在WebSocket握手期间：意外的响应代码：404

index.html

<!DOCTYPE html>
<html>
    <head>
        <title>Start Page</title>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    </head>
    <body>
        <h1>Collaborative Whiteboard App</h1>
        <div id="output"></div>
        <script type="text/javascript" src="websocket.js"></script>
    </body>
</html>

websocket.js

var wsUri = "ws://" + document.location.host + document.location.pathname + "whiteboardendpoint";
var websocket = new WebSocket(wsUri);
websocket.onerror = function(evt) { onError(evt) };
function onError(evt) {
    writeToScreen('<span style="color: red;">ERROR:</span> ' + evt.data);
}
// For testing purposes
var output = document.getElementById("output");
websocket.onopen = function(evt) { onOpen(evt) };
function writeToScreen(message) {
    output.innerHTML += message + "<br>";
}
function onOpen(evt) {
    writeToScreen("Connected to " + wsUri);
}
// End test functions

MyWhiteboard.java

package org.myapps.whiteboardapp;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
@ServerEndpoint("/whiteboardendpoint ")
public class MyWhiteboard {
    private static Set<Session> peers = Collections.synchronizedSet(new HashSet<Session>());
    @OnMessage
    public String onMessage(String message) {
        return null;
    }
    @OnOpen
    public void onOpen (Session peer) {
        peers.add(peer);
    }
    @OnClose
    public void onClose (Session peer) {
        peers.remove(peer);
    }
}

我哪里错了？我该如何解决这个问题？

您有一个无效的服务器注释

修复此

@ServerEndpoint("/whiteboardendpoint ")

至

@ServerEndpoint("/whiteboardendpoint") /* removed space */

按照目前的定义方式，您可能只需将javascript wsUri定义更改为。。。

var wsUri = "ws://" + document.location.host + document.location.pathname +
            "whiteboardendpoint%20";
var websocket = new WebSocket(wsUri);

让它发挥作用。（刚刚添加了一个URI编码空间）

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