spring - GWT - RemoteService 接口(interface)和 Spring - 如何获取 HttpSession？

Question

我将 GWT (2.5) 与 RPC、Spring 和 Postgresql 一起用于我的项目。我的问题是关于 HttpSession 处理。
所有对服务器的查询都由 Spring (DispatchServlet) 分派(dispatch)到我的 GwtController (extends RemoteServiceServlet) 。
特定的 RemoteService 被注入(inject)到 GwtController 中。在 GwtContorller 中获取 HttpSession 很容易。
例如通过 getThreadLocalRequest().getSession() 或仅来自 request.getSession()。
我的问题是如何在 RemoteService 中获取 HttpSession 对象？

public class GwtRpcController extends RemoteServiceServlet {
……………
private RemoteService remoteService;
private Class remoteServiceClass;
………………

public ModelAndView handleRequest(HttpServletRequest arg0, HttpServletResponse arg1) throws Exception {
    …………
} 

public String processCall(String payload) throws SerializationException {
    …………
}

public void setRemoteService(RemoteService remoteService) {
    …………….
}

}

我的接口(interface) - 实现 RemoteService 的 DataService

public class DataServiceImpl implements DataService {

public Data getData(){

    !!!!! Here I want to get HttpSession !!!!!
    …………………………

}

}

Answer 1

您可以维护一个 ThreadLocal在您的 Servlet并在那里存储您当前的Request ，然后公开您的Request使用静态方法。

public class GwtRpcController extends RemoteServiceServlet {

  static ThreadLocal<HttpServletRequest> perThreadRequest = 
         new ThreadLocal<HttpServletRequest>();

  @Override
  public String processCall(String payload) throws SerializationException {
    try {
      perThreadRequest.set(getThreadLocalRequest());
      return super.processCall(payload);
    } finally {
      perThreadRequest.set(null);
    }
  }

  public static HttpServletRequest getRequest() {
    return perThreadRequest.get();
  }
}


 public class DataServiceImpl implements DataService {
    public Data getData(){
       HttpServletRequest request = GwtRpcController.getRequest();
       HttpSession session = request.getSession();
    }
 }