Hi. I am trying to write a very simple Login servlet, just for testing
purposes, but I have problems.
I 've constructed a sample form with username & password fields.
Whatever values I input in the username & password fields, even
the "correct" ones, such as "client" & "pass", the control of the
program goes to the following part of the code
....
else if(name != client || pasw != pass)
{
msg = "Your login name or password is inncorrect. Try again";
.....
msg = "Your login name or password is inncorrect. Try again";
.....
It doesn't seem to go through this part of the code
.......
if(req.getParameter("ok") != null)
{
if(name == client & pasw == pass) {
{
if(name == client & pasw == pass) {
.........}
......
Could you help me?
The problem is, I suppose, in the following part of the code:
.......
if(req.getParameter("ok") !=
null)
{
if(name == client & pasw == pass) {
{
if(name == client & pasw == pass) {
.........}
......
Here is the whole source code:
public class Login extends HttpServlet {
String client = "client";
String pass = "pass";
public void init(ServletConfig config) throws
ServletException
{super.init(config);}
{super.init(config);}
protected void doGet(HttpServletRequest req,
HttpServletResponse res)
throws ServletException, IOException
{
res.setContentType("text/html");
res.setHeader("pragma", "no-cache");
PrintWriter out = res.getWriter();
out.println("<HTML><HEAD><TITLE>Form</TITLE></HEAD>");
out.println("</UL><HR><FORM METHOD=POST>");
out.println("Username: <INPUT TYPE=TEXT NAME=username><BR>");
out.println("Password: <INPUT TYPE=PASSWORD NAME=password><BR>");
out.println("<BR>");
out.println("<INPUT TYPE=SUBMIT NAME=ok VALUE=OK>");
out.println("<INPUT TYPE=SUBMIT NAME=cancel VALUE=CANCEL>");
out.println("</FORM><HR></BODY></HTML>");
out.close();
}
throws ServletException, IOException
{
res.setContentType("text/html");
res.setHeader("pragma", "no-cache");
PrintWriter out = res.getWriter();
out.println("<HTML><HEAD><TITLE>Form</TITLE></HEAD>");
out.println("</UL><HR><FORM METHOD=POST>");
out.println("Username: <INPUT TYPE=TEXT NAME=username><BR>");
out.println("Password: <INPUT TYPE=PASSWORD NAME=password><BR>");
out.println("<BR>");
out.println("<INPUT TYPE=SUBMIT NAME=ok VALUE=OK>");
out.println("<INPUT TYPE=SUBMIT NAME=cancel VALUE=CANCEL>");
out.println("</FORM><HR></BODY></HTML>");
out.close();
}
protected void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
String name = req.getParameter("username");
String pasw = req.getParameter("password");
String msg = "";
if(req.getParameter("ok") !=
null)
{
if(name == client & pasw == pass) {
msg = "Welcome!";
res.setContentType("text/html");
res.setHeader("pragma", "no-cache");
PrintWriter out = res.getWriter();
out.println("<HTML><HEAD><TITLE>Form</TITLE></HEAD><BODY>");
out.println(msg);
out.println("</BODY></HTML>");
out.close();
}
else if(name != client || pasw != pass) {
msg = "Your login name or password is inncorrect. Try again";
res.setContentType("text/html");
res.setHeader("pragma", "no-cache");
PrintWriter out = res.getWriter();
out.println("<HTML><HEAD><TITLE>Form</TITLE></HEAD><BODY>");
out.println(msg);
out.close();
}
}
else if(req.getParameter("cancel") != null) {
msg = "Visit us again soon!";
res.setContentType("text/html");
res.setHeader("pragma", "no-cache");
PrintWriter out = res.getWriter();
out.println("<HTML><HEAD><TITLE>Form</TITLE></HEAD><BODY>");
out.println(msg);
out.println("<HR><A HREF=Welcome.html>Go Home</A><HR>");
out.println("</BODY></HTML>");
out.close();
}
}
{
if(name == client & pasw == pass) {
msg = "Welcome!";
res.setContentType("text/html");
res.setHeader("pragma", "no-cache");
PrintWriter out = res.getWriter();
out.println("<HTML><HEAD><TITLE>Form</TITLE></HEAD><BODY>");
out.println(msg);
out.println("</BODY></HTML>");
out.close();
}
else if(name != client || pasw != pass) {
msg = "Your login name or password is inncorrect. Try again";
res.setContentType("text/html");
res.setHeader("pragma", "no-cache");
PrintWriter out = res.getWriter();
out.println("<HTML><HEAD><TITLE>Form</TITLE></HEAD><BODY>");
out.println(msg);
out.close();
}
}
else if(req.getParameter("cancel") != null) {
msg = "Visit us again soon!";
res.setContentType("text/html");
res.setHeader("pragma", "no-cache");
PrintWriter out = res.getWriter();
out.println("<HTML><HEAD><TITLE>Form</TITLE></HEAD><BODY>");
out.println(msg);
out.println("<HR><A HREF=Welcome.html>Go Home</A><HR>");
out.println("</BODY></HTML>");
out.close();
}
}
}
Thanks for your time.
