getAttributeNames() Method Of The Request Object
This section provides you the detailed explanation of
the getAttributeNames() method of the request object in JSP. Here,
you will learn why this is used and how it is used in the JSP application.
Here, you will see that three files are provided in
this section. These files are as follows:
- GetAttributeNamesMethod.html
- GetAttributeNamesMethod.jsp
- GetAttributeNamesMethod1.jsp
First is the GetAttributeNamesMethod.html file which is
used for constructing a html form with two fields user name and another is for
the password. When you submit the form GetAttributeNamesMethod.jsp file is
called which sets all the setting you can see in the code and redirect to the
another JSP file GetAttributeNamesMethod1.jsp file that gets the request
and response object sent by the RequestDispatcher in the
GetAttributeNamesMethod page and through the retrieved request and response
object you can get all the attribute name by using the getAttributeNames()
method in the enumerated form i.e. retrieved one by one through the enumerating
the retrieved data.
Here is the code of the GetAttributeNamesMethod.html
file:
<html>
<body>
<form action="GetAttributeNamesMethod.jsp" method="post">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td>User Name: </td>
<td><input type="text" size="20" name="txtUserName" />
</tr>
<tr>
<td>Password: </td>
<td><input type="password" size="20" name="txtPassword" />
</tr>
<tr>
<td> </td>
<td><input type="submit" value="Submit" name="B1" /></td>
</tr>
</table>
</form>
</body>
</html>
|
Output for the GetAttributeNamesMethod.html file:
Here is the JSP code of the
GetAttributeNamesMethod.jsp file:
<%
String username, password;
if(request.getParameter("txtUserName") == null)
username = "";
else
username = request.getParameter("txtUserName");
if(request.getParameter("txtPassword") == null)
password = "";
else
password = request.getParameter("txtPassword");
%>
<%
String strViewPage="GetAttributeNames1.jsp";
RequestDispatcher dispatcher = request.getRequestDispatcher(strViewPage);
if (dispatcher != null){
dispatcher.forward(request, response);
}
%>
|
Here is the JSP code of the
GetAttributeNamesMethod1.jsp file:
<%@page import="java.util.*" %>
<%
for(Enumeration e = request.getAttributeNames(); e.hasMoreElements(); ){
String attName = (String)e.nextElement();
out.println("<br/>" + attName);
}
%>
|
Output for the above mentioned JSP code:
Download the
GetAttributeNamesMethod.html file.
Download the
GetAttributeNamesMethod.jsp file.
Download the
GetAttributeNamesMethod1.jsp file.
|
Del.icio.us
Digg
Google
Spurl
Blink
Furl
Simpy
Y! MyWeb
