The last post of mine was about the basics of the scopes and focused on the application and the session among four scopes: Page, Request, Session, and Application.
2022.08.26 - [JSP] - JSP) Scopes - Basics / Application
JSP) Scopes - Basics / Application
There are four scopes in JSP. Scope Description Page Stores a value to be shared within one JSP page. Request Stores values to be shared on all JSP pages used to process a single request. Session Sh..
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In this post, we will cover the page and the request scopes.
Page and Request
<%@ page language="java" contentType="text/html; charset=EUC-KR"
pageEncoding="EUC-KR"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=EUC-KR">
<title>Insert title here</title>
</head>
<body>
<%
pageContext.setAttribute("pageScope", "pageValue");
request.setAttribute("requestScope", "requestValue");
%>
pageValue = <%=pageContext.getAttribute("pageScope") %><br>
requestValue = <%=request.getAttribute("requestScope") %>
</body>
</html>With a forward action tag
With the forward action tag, you will not see anything on a browser, but it will still forward the data to the designated page.
<%@ page language="java" contentType="text/html; charset=EUC-KR"
pageEncoding="EUC-KR"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=EUC-KR">
<title>Insert title here</title>
</head>
<body>
<%
pageContext.setAttribute("pageScope", "pageValue");
request.setAttribute("requestScope", "requestValue");
%>
<jsp:forward page="requestTest5Result.jsp"></jsp:forward>
</body>
</html>Result page
<%@ page language="java" contentType="text/html; charset=EUC-KR"
pageEncoding="EUC-KR"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=EUC-KR">
<title>Insert title here</title>
</head>
<body>
pageValue = <%=pageContext.getAttribute("pageScope") %><br>
requestValue = <%=request.getAttribute("requestScope") %>
</body>
</html>You cannot use the page scope anymore so it will turn out null.
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