Websocket - httpSession返回null
我想在websocket握手\会话与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);
}
}正如这篇文章中提到的：Accessing HttpSession from HttpServletRequest in a Web Socket @ServerEndpoint
现在，由于握手时的某些原因，(HttpSession)request.getHttpSession()总是返回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>你知道为什么没有创建会话吗？谢谢
回答 3
Stack Overflow用户
发布于 2015-12-17 04:35:13
这是Pavel Bucek答案的impl，添加后，我得到了会话
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();
}
}Stack Overflow用户
发布于 2017-07-14 05:44:59
在@pavel-bucek 's answer的基础上，我写了一个simple HttpSessionInitializerFilter servlet filter。
只需从"Releases“页面下载jar并将其保存在类路径中的任何位置，然后将以下代码片段添加到您的模式描述符中(根据需要修改web.xml -pattern)：
<filter>
<filter-name>HttpSessionInitializerFilter</filter-name>
<filter-class>net.twentyonesolutions.servlet.filter.HttpSessionInitializerFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>HttpSessionInitializerFilter</filter-name>
<url-pattern>/ws/*</url-pattern>
</filter-mapping>Stack Overflow用户
发布于 2017-08-25 11:17:16
首先:创建一个新类
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 servletRequestEvent) {
}
@Override
public void requestInitialized(ServletRequestEvent servletRequestEvent) {
((HttpServletRequest)servletRequestEvent.getServletRequest()).getSession();
}
}然后在App main上添加"ServletComponentScan“注释：
@SpringBootApplication
@ServletComponentScan
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}https://stackoverflow.com/questions/20240591
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