错误码200和404 websocket在tomcat 7.0.53

我使用tomcat 7.0.53来制作websocket代码，当我使用a/用于websocket位置时，错误代码200，当我使用/echo用于websocket位置时，错误代码404。我不知道为什么它不工作。下面是我的程序的html和java端代码。

Java:

package wsapp;
import java.io.IOException;
import java.util.ArrayList;
import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;
@ServerEndpoint(value = "/echo")
public class WsChat{
//notice:not thread-safe
private static ArrayList<Session> sessionList = new ArrayList<Session>();
@OnOpen
public void onOpen(Session session){
    try{
        sessionList.add(session);
        //asynchronous communication
        session.getBasicRemote().sendText("Hello!");
    }catch(IOException e){}
}
@OnClose
public void onClose(Session session){
    sessionList.remove(session);
}
@OnMessage
public void onMessage(String msg){
    try{
        for(Session session : sessionList){
            //asynchronous communication
            session.getBasicRemote().sendText(msg);
        }
    }catch(IOException e){}
}
}

HTML:

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Tomcat WebSocket Chat</title>
    <script>
        var ws = new WebSocket("ws://localhost:8080/echo");
        ws.onopen = function(){
        };
        ws.onmessage = function(message){
            document.getElementById("chatlog").textContent += message.data + "n";
        };
        function postToServer(){
            ws.send(document.getElementById("msg").value);
            document.getElementById("msg").value = "";
        }
        function closeConnect(){
            ws.close();
        }
    </script>
</head>
<body>
    <textarea id="chatlog" readonly></textarea><br/>
    <input id="msg" type="text" />
    <button type="submit" id="sendButton" onClick="postToServer()">Send!</button>
    <button type="submit" id="sendButton" onClick="closeConnect()">End</button>
</body>

网址为http://localhost:8080/websocket/。但是在代码

中

var ws = new WebSocket("ws://localhost:8080/echo");

使用

代替正确的方法var ws = new WebSocket("ws://localhost:8080/websocket/echo");。在此之后，握手和与套接字的通信正常工作。

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