Actually, as far as I know, if you submit the form, the username textfield
is not null, but an empty string. You should test for null and for an empty
string.
-----Original Message-----
From: A mailing list about Java Server Pages specification and reference
[mailto:[EMAIL PROTECTED]]On Behalf Of liuhao
Sent: Wednesday, April 12, 2000 11:37 PM
To: [EMAIL PROTECTED]
Subject: about scpritlet
hi everyone:
i find something wrong in my following files.
i do not understant what is the effect of "<% if
(request.getParameter("usename")!=null) { %>" in the myjsp.jsp. if i input
nothing in the text form on the browser, server will response"Hello !"to me.
it is "null" for the variable of "usename"!? if this srciptlet is no effect
on my program, why is not there display of "Hello !" before i click the
"Submit" button.
please help! thank you.
javabean file:
public class HiBean {
private String usename;
public HiBean() {
usename=null;
}
public void setusename(String name){
this.usename=name;
}
public String getusename(){
return usename;
}
}
myjsp.jsp:
<html> <body>
<form method="get">
<input type="text" name="usename">
<br>
<input type="submit" value="Submit">
</form>
<% if (request.getParameter("usename")!=null) { %>
<%@ include file="response.jsp" %>
<% } %>
</body> </html>
response.jsp file:
Hello <jsp:getProperty name="hello" property="usename" />!
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- about scpritlet liuhao
- Shannon Moschetti
