java中实现兼容ie6 7 8 9的spring4+websocket

  <servlet>
    <servlet-name>websocket</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value> 
        /WEB-INF/applicationContext.xml 
      </param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>websocket</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

  <websocket:handlers allowed-origins="*">
       ........
  </websocket:handlers>

public class ChatIntercepter extends HttpSessionHandshakeInterceptor{
  
  @Override
  public boolean beforeHandshake(ServerHttpRequest request,
      ServerHttpResponse response, WebSocketHandler wsHandler,
      Map<String, Object> attributes) throws Exception {
    if (request instanceof ServletServerHttpRequest) {
      ServletServerHttpRequest servletRequest = (ServletServerHttpRequest) request;
      HttpSession session = servletRequest.getServletRequest().getSession(false);
      if (session != null) {
        String userName = (String) session.getAttribute("user");
        attributes.put("user",userName);
      }
    }
    System.out.println("Before Handshake"+request.getHeaders());
//    return super.beforeHandshake(request, response, wsHandler, attributes);
    return true;
  }
   ..............

}