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LoginHandler.javaAPI DocExample1615Tue Jan 25 10:45:14 GMT 2000None

LoginHandler.java

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class LoginHandler extends HttpServlet {

  public void doPost(HttpServletRequest req, HttpServletResponse res)
                                throws ServletException, IOException {
    res.setContentType("text/html");
    PrintWriter out = res.getWriter();

    // Get the user's name and password
    String name = req.getParameter("name");
    String passwd = req.getParameter("passwd");

    // Check the name and password for validity
    if (!allowUser(name, passwd)) {
      out.println("<HTML><HEAD><TITLE>Access Denied</TITLE></HEAD>");
      out.println("<BODY>Your login and password are invalid.<BR>");
      out.println("You may want to <A HREF=\"/login.html\">try again</A>");
      out.println("</BODY></HTML>");
    }
    else {
      // Valid login.  Make a note in the session object.
      HttpSession session = req.getSession(true);
      session.putValue("logon.isDone", name);  // just a marker object

      // Try redirecting the client to the page he first tried to access
      try {
        String target = (String) session.getValue("login.target");
        if (target != null)
          res.sendRedirect(target);
        return;
      }
      catch (Exception ignored) { }

      // Couldn't redirect to the target.  Redirect to the site's home page.
      res.sendRedirect(req.getScheme() + "://" + 
                       req.getServerName() + ":" + req.getServerPort());
    }
  }

  protected boolean allowUser(String user, String passwd) {
    return true;  // trust everyone
  }
}