Question

对于某些背景，我正在使用JBoss AS 7和EJB。我正在使用errai消息总线从客户端向我的服务器发送消息，当它最初连接时检索其会话ID，以便稍后我可以从它发出请求并让服务器响应特定客户端。

我该怎么做呢？我可以以某种方式注入HttpSession对象服务器端吗？我对此很新，所以请耐心等待。如果我太模糊，请告诉我，我会尝试详细说明。

Answer 1

// the following variable is in the Http servlet service() method arguments
// only shown here this way to demonstrate the process
javax.servlet.http.HttpServletRequest serviceRequest;
javax.servlet.http.HttpServletResponse serviceResp; // addCookie()
javax.servlet.http.HttpSession cecil;
javax.servlet.http.Cookie[] reqCk;


// "(boolean overload) "true" creates the session" or call the other overload version method with no argument 
// to retrieve the session getSession() "the server container stores and creates sessions"
// false in that version is to avoid bothering for a session to cut down uneeded processing


cecil = serviceRequest.getSession();//creates a session if it does not have one


String httpSession_ID = cecil.getID();


if((reqCk = serviceRequest.getCookies()) == null){

// perhaps create a cookie here using "new class "
// cookiePiece = new javax.servlet.http.Cookie("COOKIENAME",....); ....YOU MUST LEARN THE COOKIE PARTS WRITING RULES FOR BROWSER COOKIES !!! ; ; ;
serviceResp.addCookie(cookiePiece); // now is on the servers array "reqCk"

}else{

// process the cookie here using javax.servlet.http.Cookie methods

}

存储和检索数据的其他方式是会话范围的JSP或JSF bean 。

Answer 2

如果要向ErraiBus服务方法发送消息，则可以使用Message对象。您可以从中检索会话并获取该会话的ID，如下所示：

@Service
public class ClientHelloService implements MessageCallback {
  @Override
  public void callback(final Message message) {
    HttpSession session = message.getResource(
        HttpServletRequest.class, HttpServletRequest.class.getName()).getSession();
    System.out.println("Client said hello. Session ID: " + session.getId());
  }
}

如果您将消息发送到Errai RPC端点，则无法轻松访问该消息。在这种情况下，您必须使用RpcContext.getSession()方法：

@Service
public class ClientHelloRpcServiceImpl implements ClientHelloRpcService {
  @Override
  public void hello() {
    HttpSession session = RpcContext.getHttpSession();
    System.out.println("Client said hello. Session ID: " + session.getId());
  }
}

这种方式很简单但很难看：RpcContext类在ThreadLocal中存储包含RPC请求的Message对象，它只是从中检索HttpSession。

试图检索HttpSession对象

2 个答案: