How to put browser's native login prompt in JSP and retrieve the username & password

Question

I want the web browser to ask for username and password using it's default login prompt like this.


I read about how to implement it here but it is for ASP. I want it done in JSP or servlet and I also want to know that how will I receive those username and password in my servlet

Answer 1

You need to use BASIC authentication. You need to use JAAS for the same. This tutorial provides FORM based authentication. but as you want BASIC authentication, you need to

<login-config>
     <auth-method>BASIC</auth-method>
</login-config>

You can retrieve the user principal as follows

request.getUserPrincipal().getName().toString(); 

Answer 2

You have to use Basic authentication for this you can refer following link, it gives basic authentication using servlet.

<login-config>
        <auth-method>BASIC</auth-method>
</login-config>

It configures basic authentication in web.xml Also, you need to add

<?xml version='1.0' encoding='utf-8'?>
<tomcat-users>
  <role rolename="tomcat"/>
  <user username="tomcat" password="tomcat" roles="tomcat"/>
  <user username="yourname" password="yourpassword" roles="tomcat"/>
  <user username="test" password="test"/>
</tomcat-users>

in tomcat-users.xml

Example link : http://www.avajava.com/tutorials/lessons/how-do-i-use-basic-authentication-with-tomcat.html?page=1

Hope it helpful to you.

Answer 3

public void  doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    request.setCharacterEncoding("windows-31j");
    response.setContentType("text/html; charset=windows-31j");
    String auth = request.getHeader("Authorization");
    if (auth == null)
    {
      response.setStatus(401); 
      response.setHeader("Cache-Control","no-store"); 
      response.setDateHeader("Expires",0); 
      response.setHeader("WWW-authenticate","Basic Realm=\"AuthDemo Server\""); 

    } else {
        response.getWriter().print("Authorization :" + request.getHeader("Authorization"));
    }

            }
      }