JSP Get Value of Property
I am very new to JSPs so I need your help. Google didn't give me what I was looking for, I might just entered the wrong search term. So please forgive me, but I think its a really dumb question, however nothing seems to be on the net about it.
I created a login screen (works fine) and the credentials are checked (works fine) and the main screen gets a DTO which should be evaluated.
As you can see, there is a jsp:getProperty tag, it works fine, if I try to access the paramter name using jsp:getProperty. I want to do some additional checks, therefor I tried to access the property within the <% %> section, in there however, it is null. Is there a way how to access the object within the <<% %> section, after you retrieved it with a jsp:useBean tag?
Here is the main jsp file:
<?xml version="1.0" encoding="ISO-8859-1" ?>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page import="de.daniel.docmanager.dto.User" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
</head>
<body>
<jsp:useBean id="user" class="de.daniel.docmanager.dto.User" scope="session">
</jsp:useBean>
<%
String name = user.getName();
System.out.println("name: " + name); //<= name is null
%>
Hello <jsp:getProperty property="name" name="user"/> //<= works fine
</body>
</html>
Thank you very much for your support. I really do appreciate it.
Answer
It is a bad practice to use scriptlets in JSP . Read this nice SO Q&A : How to avoid Java Code in JSP-Files? on this subject .
Coming back to your problem. You are defining a bean using Standard Action as :
<jsp:useBean id="user" class="de.daniel.docmanager.dto.User" scope="session">
</jsp:useBean>
The useBean tag will look for an instance of the "de.daniel.docmanager.dto.User" class in the session . If the instance is not already there, it will create a new instance of "de.daniel.docmanager.dto.User" , and put it in the session.
You have to retrieve the object from the session scope :
<%
String name = ((de.daniel.docmanager.dto.User)session
.getAttribute("user")).getName();
System.out.println("name: " + name);
%>
I want to do some additional checks, therefor I tried to access the property within the <% %> section
You can use JSTL or some tag library for that purpose.