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I want to used lang to mark languages.In the process of authentication,This parameter is lost

http://localhost:8080/auth/login?lang=en I want to used lang to mark languages.In the process of authentication,This parameter is lost.
I read the source code.
LoginUrlAuthenticationEntryPoint.commence
```java
public void commence(HttpServletRequest request, HttpServletResponse response,
AuthenticationException authException) throws IOException, ServletException {
String redirectUrl = null;
if (useForward) {
if (forceHttps && "http".equals(request.getScheme())) {
// First redirect the current request to HTTPS.
// When that request is received, the forward to the login page will be
// used.
redirectUrl = buildHttpsRedirectUrlForRequest(request);
}
if (redirectUrl == null) {
String loginForm = determineUrlToUseForThisRequest(request, response,
authException);
if (logger.isDebugEnabled()) {
logger.debug("Server side forward to: " + loginForm);
}
RequestDispatcher dispatcher = request.getRequestDispatcher(loginForm);
dispatcher.forward(request, response);
return;
}
}
else {
// redirect to login page. Use https if forceHttps true
redirectUrl = buildRedirectUrlToLoginPage(request, response, authException);
}
redirectStrategy.sendRedirect(request, response, redirectUrl);
}
```
Rewrite redirectUrl
AbstractAuthenticationFilterConfigurer
java
private void addAuthenticationEntryPoint(HttpSecurity http, OAuth2SsoProperties sso)
throws Exception {
...
exceptions.defaultAuthenticationEntryPointFor(
new LoginUrlAuthenticationEntryPoint(sso.getLoginPath()),
preferredMatcher);
...
}
That need to Overwrite too much code.
I wonder if I didn't find a suitable existing configuration to solve this problem.

solved by Filter
save the msg in session

changing URL but want to send data to controller

My web application has a new requirement that if parameter coming in url then land to email page. otherwise on index page like always.
Its a very old client product and not much scope to change lot in code so i put a check in controller that if encrypted email coming in then land to email page.
example url -
http://localhost:8080/R2/Controller?email=jAOtTv22BfkTkVrhTN/RHQ==
Everything works fine but i want to change URL.
How can i get rid of " /Controller " in URL but still it hits to controller.???
Controller code like -
public class Controller extends HttpServlet {
static Logger logger = Logger.getLogger(Controller.class);
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
// get the action property from the request
String theAction = request.getParameter("action");
String theSource = request.getParameter("s");
String theSource1 = request.getParameter("email");
String em ="";
Action action=null;
em = EncryptEmail.decrypt(theSource1,GFWConstants.BLOWFISH_KEY);
if (em.equals(""))
rd = request.getRequestDispatcher("index.jsp?emailRtv=0");
else
rd = request.getRequestDispatcher("email-preferences.jsp?emailRtv=2&emailAddress="+em);
rd.forward(request,response);
return;
}
Thanks in advance.

adding two url-pattern to web.xml file worked.

Declare a session variable golbaly to access from DoGet and DoPost in a sevlet

I have a servlet where I need to declare a session which can be acceptable form doGet and doPost both how I should do this?
I have done
#WebServlet(name = "LoginLogout", urlPatterns = {"/LoginLogout.do"})public class LoginLogout extends HttpServlet {//For Session
HttpSession session = request.getSession(true);
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
}
#Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String status = request.getParameter("status");
System.out.println(status);
}
#Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
String loginId = request.getParameter("login_id");
String password = request.getParameter("password");
System.out.println(loginId);
//Inserting value to the Pogo named "newLoginPogo"
loginData newLoginPogo = new loginData();
newLoginPogo.setLoginId(loginId);
newLoginPogo.setPassword(password);
//Creating a obj of ModelLogin to send the loginId and Password via a method which is in ModelLogin class
ModelLogin loginBis = new ModelLogin();
loginData userData = loginBis.checkUser(newLoginPogo);
String userExist = userData.getUserExist();
System.out.println(userExist);
if ("yes".equals(userExist)) {
System.out.println("In while loop of Servlet");
String firstName = userData.getFirstName();
String userId = userData.getUserId();
boolean IsSu = userData.getIsSu();
//conveting boolean to string
String superuser = new Boolean(IsSu).toString();
//Creating a session
session.setAttribute("firstName", firstName);
session.setAttribute(userId, "userId");
session.setAttribute(superuser, "IsSu");
//==============================================================================================================
//If user does exist show the Success Message and forward Dashboard
//==============================================================================================================
//Session for success message
String succmsg = "Login Successful";
session.setAttribute("succmsg", succmsg);
getServletConfig().getServletContext().getRequestDispatcher("/WEB-INF/ViewPages/dashboard/dashboard.jsp").forward(request, response);
} //==============================================================================================================
//If user does not exist show the Error Message
//==============================================================================================================
else if ("no".equals(userExist)) {
//Session for success message
System.out.println("inside NO");
String emsg = "Login Error";
session.setAttribute("errmsg", emsg);
getServletConfig().getServletContext().getRequestDispatcher("/index.jsp").forward(request, response);
} else {
}
/*
//===============================================================================================================
//code for Logout
//===============================================================================================================
String status = request.getParameter("status");
if ("logout".equals(status)) {
//clearing the session
session.invalidate();
//forwarding to index page
getServletConfig().getServletContext().getRequestDispatcher("/index.jsp").forward(request, response);
}
*/
} finally {
}
}}
But it says
Can Not find Symbol
in this line HttpSession session = request.getSession(true);

You don't need to have session variable in servlet as field. In general - this is kind of common mistake. There will be only one onstance of servlet serving lots of requests, and unless you declare it as single-threaded - the requests would be handled concurrently.
HttpSession will be pre-exist for you in doGet and doPost via request object. Servlet container will guarantee this. So simply obtain reference to the session in doGet/doPost and do whatever you want.

What you desire is one of the roles of HTTP session.
You can look at it as a conversation between the client and the server.
As long as the "conversation" (HTTP session) is open and alive, you can set variables on the HTTP session, and access them from different requests that will sent on the same session.
Look at this as some sort of "shared memory" that exists during the "conversation time".
You can find many examples on how to do that over the internet.
Here is an example for session tracking.

Reloading JSP page

I have an authorization frame displayed on every page and I want to keep that page displaying even if the user will choose to log in (using jstl tags i will simply put instead of this frame user info and link to shopping cart). How can i achieve that ? I have some ideas, but they all breaking out my controller design.
public class FrontController extends HttpServlet {
private ActionContainer actionContainer = ActionContainer.getInstance();
public FrontController() {
super();
}
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
* #param request servlet request
* #param response servlet response
* #throws ServletException if a servlet-specific error occurs
* #throws IOException if an I/O error occurs
*/
#SuppressWarnings("unchecked")
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String page = null;
try {
Action action = actionContainer.getAction(request);
page = action.execute(request, response);
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(page);
dispatcher.forward(request, response);
} catch (ActionNotFoundException e) {
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(PageNames.ERR_PAGE);
request.setAttribute(AttributeNames.ERR_MESSAGE_ATTRIBUTE, "Unknown Action command: " + e.getMessage());
dispatcher.forward(request, response);
} catch (Exception e) {
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(PageNames.ERR_PAGE);
request.setAttribute(AttributeNames.ERR_MESSAGE_ATTRIBUTE, "Exception:\n" + e.getMessage());
dispatcher.forward(request, response);
}
}
#Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
#Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
* #return a String containing servlet description
*/
#Override
public String getServletInfo() {
return "Front Controller";
}
#Override
public void init() throws ServletException {
super.init();
Locale.setDefault(new Locale("ru","RU"));
}
}
I was thinking about of redirecting to especially written for this case page, which will redirect to the original page, or to check page string for null and reloading from controller the original page, but i cannot clearly understand how to do this.

Your question isn't clear enough. But I think you're asking how you can replace a certain component on a page (Login button) with an other (username, welcome message and shopping cart details) after the user logs in.
If I understand your requirements, then what I would do after the user logs in is set a cookie (or a value in localStorage). The cookie is added to the Set-Cookie response header by means of the addCookie method of HttpServletResponse. Here's an example:
Cookie userCookie = new Cookie("user", "uid1234");
response.addCookie(userCookie);
Then in your controller simply check if the "user" value is set or not and take the appropriate action. A tutorial on servlets with cookies.
If you need to handle the front-end component, and change values on the form without reloading the page, I would recommend using javascript to do this, you can find and remove the old DOM elements with new ones (User's name, Welcome message, shopping cart, whatever).
If your iFrame is doing the login, then on successful login, have it call a function in your top window that does the update after reading the updated values from the cookie.
If you want to handle this completely at the front-end, i.e. Javascript, then I would skip using cookies and use localStorage instead. There is plenty of help on Stackover and on the internet about what localStorage is, but I will suggest the YUI Storage Lite library which makes storing and loading data from localStorage very simple.
Regards,

Include the current URL as a hidden field of your authentication form. In the action handling the authentication, once the user is authenticated, redirect to this URL.
In the JSPs, test if the user is authenticated and include the authentication form or the shopping cart. This test can be done by just putting a boolean value in the HTTP session once the user is authenticated.

Configure tomcat to accept post request

How can I configure tomcat so when a post request is made the request parameters are outputted to a jsp file? Do I need a servlet which forwards to a jsp or can this be handled within a jsp file ?
Here is my method which sends the post request to the tomcat server -
public void sendContentUsingPost() throws IOException {
HttpConnection httpConn = null;
String url = "http://LOCALHOST:8080/services/getdata";
// InputStream is = null;
OutputStream os = null;
try {
// Open an HTTP Connection object
httpConn = (HttpConnection)Connector.open(url);
// Setup HTTP Request to POST
httpConn.setRequestMethod(HttpConnection.POST);
httpConn.setRequestProperty("User-Agent",
"Profile/MIDP-1.0 Confirguration/CLDC-1.0");
httpConn.setRequestProperty("Accept_Language","en-US");
//Content-Type is must to pass parameters in POST Request
httpConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
// This function retrieves the information of this connection
getConnectionInformation(httpConn);
String params;
params = "?id=test&data=testdata";
System.out.println("Writing "+params);
// httpConn.setRequestProperty( "Content-Length", String.valueOf(params.length()));
os = httpConn.openOutputStream();
os.write(params.getBytes());
} finally {
if(os != null)
os.close();
if(httpConn != null)
httpConn.close();
}
}
Thanks

First of all, your query string is invalid.
params = "?id=test&data=testdata";
It should have been
params = "id=test&data=testdata";
The ? is only valid when you concatenate it to the request URL as a GET query string. You should not use it when you want to write it as POST request body.
Said that, if this service is not supposed to return HTML (e.g. plaintext, JSON, XML, CSV, etc), then use a servlet. Here's an example which emits plaintext.
String id = request.getParameter("id");
String data = request.getParameter("data");
response.setContentType("text/plain");
response.setContentEncoding("UTF-8");
response.getWriter().write(id + "," + data);
If this service is supposed to return HTML, then use JSP. Change the URL to point to the JSP's one.
String url = "http://LOCALHOST:8080/services/getdata.jsp";
And then add the following to the JSP template to print the request parameters.
${param.id}
${param.data}
Either way, you should be able to get the result (the response body) by reading the URLConnection#getInputStream().
See also:
How to use URLConnection to fire and handle HTTP requests?
Unrelated to the concrete problem, you are not taking character encoding carefully into account. I strongly recommend to do so. See also the above link for detailed examples.

A servlet can handle both get and post request in following manner:
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//remaning usedefinecode
}
#Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
#Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
If you have a tomcat installation from scratch, don't forget to add the following lines to web.xml in order to let the server accept GET, POST, etc. request:
<servlet>
<servlet-name>default</servlet-name>
<servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class>
...
<init-param>
<param-name>readonly</param-name>
<param-value>false</param-value>
</init-param>
...
</servlet>