[英]How to deal with Sessions in Google App Engine?
我在servlet中成功創建了會話,我可以獲得jsp的會話/會話屬性,但不能在端點類中獲取。 我想在端點類中獲取會話信息。 請幫我解決一下這個。
我在eclipse中使用maven,我在appengine-web.xml中啟用了會話
該servlet用於檢查是否已存在會話
public class FirstServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public FirstServlet () {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
service(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
service(request, response);
}
@Override
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
HttpSession session=request.getSession(false);
if (session != null) {
String name = session.getAttribute("name");
// do something
} else {
// do something
}
}
}
如果沒有session,則使用此servlet創建會話
public class SeccondServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public SeccondServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
service(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
service(request, response);
}
@Override
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
request.getRequestDispatcher("login.html").include(request, response);
String name = request.getParameter("name");
HttpSession session=request.getSession();
session.setAttribute("name", name);
// do something
}
}
這是我的端點api類(Google Cloud Endpoints)
@Api(
name = "myapi",
version = "v1",
clientIds = "given client ids")
public class MyApi{
@ApiMethod(name = "name", path = "name", httpMethod = "post")
public List<String> getUser( HttpServletRequest servletReq) {
HttpSession session = servletReq.getSession(false);
List<String> name= new ArrayList<String>();
if(session == null) {
userName.add("no Name");
} else {
name.add((String)session.getAttribute("name"));
}
return name;
}
我仍然得到“沒有名字”的結果,即使我創建了會話,我可以得到會話屬性,這里“名稱”
假設您了解HttpSessions(如果不是,它只是在服務器和客戶端之間交換cookie以便處理登錄用戶)
因此,所有與用戶相關或任何其他會話相關信息都存儲在服務器端,並且表示信息的會話Id將作為cookie發送到客戶端,並且客戶端將在每個http請求上將其發回。
AppEngine使用數據存儲來存儲會話信息和內存緩存,以便更快地訪問
您可以使用在每個http請求中注入的標准HttpSession對象來訪問會話數據
訪問此HttpSession的代碼在您使用的框架中有所不同,如果您希望我可以使用特定的代碼片段來幫助更好地理解它
更新:
如果您正在使用servlet,那么訪問會話將如下所示
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private final String userID = "Pankaj";
private final String password = "journaldev";
protected void doPost(HttpServletRequest request,
HttpServletResponse response) {
HttpSession session=request.getSession();
// access any value
User user = (User)session.getAttribute("loggedInUser");
}
谷歌雲終端使用它如下所示
@ApiMethod
public Response getUser( HttpServletRequest servletReq) {
HttpSession session = servletReq.getSession();
session.getAttribute("loggedInUser");
}
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