Urb*_*leg 13 session tomcat httpsession websocket
我想在websocket handshake\session与HttpSession对象之间建立连接.
我使用了以下握手修改:
public class GetHttpSessionConfigurator extends ServerEndpointConfig.Configurator
{
@Override
public void modifyHandshake(ServerEndpointConfig config,
HandshakeRequest request,
HandshakeResponse response)
{
HttpSession httpSession = (HttpSession)request.getHttpSession();
config.getUserProperties().put(HttpSession.class.getName(),httpSession);
}
}
正如本文所述: 在Web Socket @ServerEndpoint中从HttpServletRequest访问HttpSession
现在,由于某些原因在握手时,(HttpSession)request.getHttpSession()一直返回null.
这是我的客户端代码:
<!DOCTYPE html>
<html>
<head>
<title>Testing websockets</title>
</head>
<body>
<div>
<input type="submit" value="Start" onclick="start()" />
</div>
<div id="messages"></div>
<script type="text/javascript">
var webSocket =
new WebSocket('ws://localhost:8080/com-byteslounge-websockets/websocket');
webSocket.onerror = function(event) {
onError(event)
};
webSocket.onopen = function(event) {
onOpen(event)
};
webSocket.onmessage = function(event) {
onMessage(event)
};
function onMessage(event) {
document.getElementById('messages').innerHTML
+= '<br />' + event.data;
}
function onOpen(event) {
document.getElementById('messages').innerHTML
= 'Connection established';
}
function onError(event) {
alert(event.data);
}
function start() {
webSocket.send('hello');
return false;
}
</script>
</body>
</html>
为什么没有创建会话的任何想法？谢谢
Pav*_*cek 10
这是预期的行为,但我同意这可能令人困惑.来自HandshakeRequest.getHttpSession的javadoc:
Run Code Online (Sandbox Code Playgroud)/** * Return a reference to the HttpSession that the web socket handshake that * started this conversation was part of, if the implementation * is part of a Java EE web container. * * @return the http session or {@code null} if either the websocket * implementation is not part of a Java EE web container, or there is * no HttpSession associated with the opening handshake request. */
问题是,尚未为您的客户端连接创建HttpSession,并且WebSocket API实现只询问是否创建了某些内容,如果没有,则不会创建它.你需要做的是调用httpServletRequest.getSession()某个之前被调用的WebSocket实现了一套过滤器(doFilter(...)被调用).
这可以通过例如ServletRequestListener#requestInitalized在不同的过滤器中或在不同的过滤器中调用所提到的方法来实现.
这是Pavel Bucek的答案的一个impl,在添加之后,我得到了我的会话
import javax.servlet.ServletRequestEvent;
import javax.servlet.ServletRequestListener;
import javax.servlet.annotation.WebListener;
import javax.servlet.http.HttpServletRequest;
@WebListener
public class RequestListener implements ServletRequestListener {
@Override
public void requestDestroyed(ServletRequestEvent sre) {
// TODO Auto-generated method stub
}
@Override
public void requestInitialized(ServletRequestEvent sre) {
((HttpServletRequest) sre.getServletRequest()).getSession();
}
}