基于表单的身份验证将变量传递给JSP

Question

We are using a form based authentication and below is the snippet from web.xml 

 <login-config>
  <auth-method> FORM </auth-method>
  <form-login-config>
        <form-login-page>/login.jsp?fromIndex=true</form-login-page>
        <form-error-page>/login.jsp?fromIndex=true&ldapAuth=fail</form-error-page>
    </form-login-config>
 </login-config>

And i do have a loginfilter that processes the authentication. So if the authentication fails i also want to send a error code to jsp to display error message. Since the HttpRequest is not carried over to the JSP page when authentication fails i cannot send the variable by putting in http request .

is there a alternate way to pass a variable to the login-errore jsp page ?

Answer 1

Instead through a parameter, you should put your data in the HttpRequest through an attribute :

// In the filter:
request.setAttribute("name", new MyObject());

// In the JSP:
MyObject obj=(MyObject)request.getAttribute("name");