tomcat 7.0.50 java websocket实现给出了404错误

Question

我正在尝试使用Java Websocket API(1.0) - JSR 356中指定的带注释端点在tomcat 7.0.50上实现websocket.以下是我编写代码的简要步骤1)使用@ServerEndpoint注释编写websocket端点2)实现@onOpen和@onMessage方法3)在谷歌浏览器上使用javascript打开websocket.

请按顺序查找与上述步骤对应的代码

1)步骤1和2 - 编写websocket服务器端点:

        package com.jkweb.websocket;

       import java.io.IOException;
       import java.util.HashMap;
       import java.util.List;
       import java.util.Map;

       import javax.websocket.EndpointConfig;
       import javax.websocket.OnMessage;
       import javax.websocket.OnOpen;
       import javax.websocket.Session;
       import javax.websocket.server.PathParam;
       import javax.websocket.server.ServerEndpoint;

       import org.slf4j.Logger;
       import org.slf4j.LoggerFactory;

  @ServerEndpoint(value="/websocket/fileuploadtracker")

@OnOpen 
public void open(Session session,EndpointConfig config) {
    ......
}
@OnMessage
public void onMessage(Session session, String msg) {
    try {
        session.getBasicRemote().sendText(msg);
    } catch (IOException e) {
        logger.error(e.getMessage());
    }
}

public static void sendMessage(String uniqueTocken,String msg){
    try {
        Session wsSession = socketConnectionMap.get(uniqueTocken);
        wsSession.getBasicRemote().sendText(msg);
    } catch (IOException e) {
        logger.error(e.getMessage());
    }
}

}

2)步骤3 - 使用chrome中的javascript api打开websocket:

      wsurl =  "ws://localhost:8080/jkweb/websocket/fileuploadtracker",
        ws; 
        ws = new WebSocket(wsurl);
         ws.onopen = function()
         {
            // Web Socket is connected, send data using send()
            ws.send("Sending first Message");
            alert("Message is sent...");
         };
         ws.onmessage = function (evt) 
         { 
            var received_msg = evt.data;
            alert("Message is received...");
         };
         ws.onclose = function(evt)
         { 
            // websocket is closed.
            alert("Connection is closed..."+evt.code + ":"+evt.reason ); 
         };        

我正在使用以下版本的软件:1)Tomcat - 7.0.50 2)Java - 1.7.45 3)Servlet - 3.0 4)包括以下Maven依赖5)Chrome - 32.0.1700.107m

     <dependency>
     <groupId>javax.websocket</groupId>
     <artifactId>javax.websocket-api</artifactId>
     <version>1.0</version>
         <scope>provided</scope>
</dependency>   

但是我收到以下错误,并且在chrome控制台中使用1066错误代码关闭了连接:

      WebSocket connection to 'ws://localhost:8080/jkweb/websocket/fileuploadtracker' failed: Error during WebSocket handshake: Unexpected response code: 404

有没有我错过的任何配置.我试图搜索很多,但找不到任何东西.我需要尽快解决这个问题.

Answer 1

我已经解决了.问题对我的安装非常具体.我的websocket api .jar也安装在我的应用程序的WEB-INF/lib目录中.不知道为什么它会破坏它.你能否解释一下这个行为的根本原因以及当你在应用程序的WEB-INF/lib和tomcat的lib中给出websocket-api.jar时它为什么不起作用？