Servlet combination with text file ...

Question

hai dude , i wanna ask some a terrible question
may be you can help me with this ...
i made servlet admin for loggin into system , but in this case
i used text file not database (sql,or else) .
for example i have admin.txt and contain :
admin myadmin
admin refers to username and myadmin refers to password
can you guys show me a little program servlet that i can learn
and study about login with servlet !!!!!!

Answer 1

Should be something like this:
public class theServlet extends HttpServlet
private Hashtable namePassword = new Hashtable();
public void init(ServletConfig config) throws ServletException
super.init(config);
try
     BufferedReader br = new BufferedReader(new FileReader("admin.txt"))
     String line = "";
     while ((line=br.readLine())!=null)
          // getting data from the lines
          // every line have to be the form: username password
          StringTokenizer stk = new StringTokenizer(line);
          namePass.put(line.nextToken(),line.nextToken());
     br.close();
catch (Exception e)
     e.printStackTrace();
public void doGet( HttpServletRequest req, HttpServletResponse resp )
throws ServletException, IOException
resp.setContentType("text/plain");
PrintWriter out = resp.getWriter();
     // the calling html-page have to have a form with the textfields username and password
     String username = req.getParameter("username");
     String password = req.getParameter("password");
     if (((String)namePassword.get(username)).equals(password))
          out.println("Login OKAY!");
     else
          out.println("Login failed!");
} // End doGet