📄 loginservlet.java
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package jwadbook.servlets;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.Enumeration;
public class LoginServlet extends HttpServlet
{
public void doPost ( HttpServletRequest req, HttpServletResponse resp )
throws ServletException,IOException
{
Enumeration params = req.getParameterNames();
PrintWriter out = resp.getWriter();
HttpSession session = req.getSession();
session.setAttribute("status", "login");
resp.setContentType("text/html");
out.println(" <HTML> ");
out.println(" <HEAD>");
out.println(" <TITLE>LoginServlet</TITLE> ");
out.println(" </HEAD> ");
out.println(" <BODY BGCOLOR=white> ");
out.println(" <CENTER> ");
out.println(" <FONT COLOR='#009999' SIZE='4' face='Arial'> ");
out.println(" <STRONG>Display the login information</STRONG> ");
out.println(" </FONT> ");
out.println(" </CENTER> ");
out.println(" <HR> ");
out.println(" <H2></H2> ");
out.println("Parameter Lists: <br> ");
out.println("<CENTER>");
out.println ( "<TABLE Border=1 BGCOLOR=WHITE> ");
out.println("<TR BGCOLOR='#99cee6'> <TH> Name </TH> <TH>Value </TH> </TR> ");
while( params.hasMoreElements() )
{
String nextparam = (String)params.nextElement();
String[] paramarray = req.getParameterValues(nextparam);
boolean first=true;
String value = "";
for ( int i=0; i<paramarray.length; i++ )
{
if ( !first )
{
value = value + " , ";
}
else
{
first = false;
}
value = value + paramarray[i];
}
out.println("<TR> <TD> " + nextparam + " </TD> <TD> <I><FONT> " + value + " </FONT></I></TD></TR>" );
}
out.println("<TR> <TD> Login Status </TD> <TD> <I><FONT> " + session.getAttribute("status") + " </FONT></I></TD></TR>" );
out.println ( "</TABLE> ");
out.println("</CENTER>");
out.println(" <HR> ");
out.println(" </BODY> ");
out.println(" </HTML> " );
out.flush();
}
public void doGet ( HttpServletRequest req, HttpServletResponse resp )
throws ServletException,IOException
{
doPost(req,resp);
}
}
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