<%@page import="java.io.IOException"
%><%@page import="java.io.PrintWriter"
%><%@page import="java.util.Dictionary"
%><%@page import="java.util.Hashtable"
%><%@page import="java.util.Vector"
%><%!
// following is identical to Java
private static
class Entry
{
private String name_;
private String comment_;
public
Entry(
String name,
String comment
)
{
name_ = name;
comment_ = comment;
}
public String name() { return name_; }
public String comment() { return comment_; }
}
private static final Vector entries = new Vector();
static
{
entries.addElement(new Entry("Socrates", "To do is to be"));
entries.addElement(new Entry("Plato", "To be is to do"));
entries.addElement(new Entry("Sinatra", "Do be do be do"));
}
private static final
String
safeTrim(
String s
)
{
return s == null ? s : s.trim();
}
// above is identical to JSP
%><%
// following is identical to JSP
String name = "";
String comment = "";
Dictionary fieldErrors = new Hashtable();
String pageMessage = null;
if ( "POST".equals(request.getMethod()) )
{
name = safeTrim(request.getParameter("name"));
comment = safeTrim(request.getParameter("comment"));
if ( name == null || name.length() == 0 )
{
fieldErrors.put("name", "Please enter your name");
}
if ( comment == null || comment.length() == 0 )
{
fieldErrors.put("comment", "Please enter a comment");
}
if ( fieldErrors.isEmpty() )
{
entries.addElement(new Entry(name, comment));
pageMessage = "Thank you for signing my guestbook!";
name = "";
comment = "";
}
else
{
pageMessage = "Please correct the items below";
}
}
// above is identical to Java
%>
request.getRequestURI()
! fieldErrors.isEmpty()
? "errorContainer"
: (pageMessage != null
? "successContainer"
: "emptyMessageContainer")
! fieldErrors.isEmpty()
? "errorMessage"
: (pageMessage != null
? "successMessage"
: "emptyMessage")
pageMessage != null ? pageMessage : " "
name
fieldErrors.get("name") != null
comment
fieldErrors.get("comment") != null
submit
entries
entry.name()
entry.comment()