java - 无法通过 websocket 连接进行连接

Question

我正在尝试在我的项目中创建一个简单的 Websocket 连接。

Java代码:

@ServerEndpoint("/echo")
public class EchoEndpoint {
@OnMessage
public void onMessage(Session session,String message){
    try{
        System.out.println(message);
    }
    catch(Exception e){
        System.out.println(e.getMessage());
    }
}

}

html 和 javascript 代码:

<button type="button" onclick="WebSocketTest()">Send</button>
<script type="text/javascript">
function WebSocketTest()
{

 alert("WebSocket is supported by your Browser!");
 // Let us open a web socket
 var ws = new WebSocket("ws://localhost:8080/echo");
 ws.onopen = function()
 {
    // Web Socket is connected, send data using send()
    ws.send("Message to send");
    alert("Message is sent...");
 };
 ws.onmessage = function (evt) 
 { 
    var received_msg = evt.data;
    alert("Message is received...");
 };
 ws.onclose = function()
 { 
    // websocket is closed.
    alert("Connection is closed..."); 
 };


 }
 </script>

按下按钮后出现错误WebSocket connection to 'ws://localhost:8080/echo' failed: Error during WebSocket handshake: Unexpected response code: 404

Jboss Wildfly8 被用作应用服务器。

有什么想法吗？或任何工作示例？

Answer 1

这是因为你把路径放错了:

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

如果您的应用程序被打包为例如:websocketapp.war(或者如果您在 websocketapp 上设置上下文路径)那么你应该使用:

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