JSP four attribute ranges

Last Update:2015-07-29 Source: Internet

Author: User

Tags ranges

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One: Page Property scope

<%@ page language="java"import="java.util.*" pageencoding="UTF-8"%>

<%@ taglib prefix="C"uri="Http://java.sun.com/jsp/jstl/core" %>

<! DOCTYPE HTML Public "-//w3c//dtdhtml 4.01 transitional//en" >

<title>my JSP ' jspobj.jsp ' starting page</title>

<body>

These properties can only be useful on the current JSP page

Pagecontext.setattribute ("name", "China");

Pagecontext.setattribute ("History", "5000");

Remove attributes and transform downward

Stringcityname= (String) pagecontext.getattribute ("name");

stringcityhistory= (String) Pagecontext.getattribute ("History");

</body>

II: request attribute Range

<%@ page language="java"import="java.util.*" pageencoding="UTF-8"%>

<%@ taglib prefix="C"uri="Http://java.sun.com/jsp/jstl/core" %>

<! DOCTYPE HTML Public "-//w3c//dtdhtml 4.01 transitional//en" >

<title>my JSP ' jspobj.jsp ' starting page</title>

<body>

Request property, only works in server jump

Request.setattribute ("req", "request Attribute");

Request.setattribute ("Reuse", "function only in server Jump");

<jsp:forward page="demo3.jsp"/>

</body>

demo3.jsp

<%@ page language="java"import="java.util.*" pageencoding="UTF-8"%>

<%@ taglib prefix="C"uri="Http://java.sun.com/jsp/jstl/core" %>

<! DOCTYPE HTML Public "-//w3c//dtdhtml 4.01 transitional//en" >

<title>my JSP ' Demo3. JSP' starting page</title>

<body>

Stringreque= (String) request.getattribute ("req");

Stringreuse= (String) Request.getattribute ("reuse");

</body>

Three: Session attribute range

<%@ page language="java"import="java.util.*" pageencoding="UTF-8"%>

<%@ taglib prefix="C"uri="Http://java.sun.com/jsp/jstl/core" %>

<! DOCTYPE HTML Public "-//w3c//dtdhtml 4.01 transitional//en" >

<title>my JSP ' jspobj.jsp ' starting page</title>

<body>

Session.setattribute ("Sename", "Session attribute range");

Session.setattribute ("Seuse", "always valid in one browser");

<!--address change, client jumps--

<a href="demo4.jsp"> Hyperlinks Get Properties </a>

</body>

demo4.jsp

<%@ page language="java"import="java.util.*" pageencoding="UTF-8"%>

<%@ taglib prefix="C"uri="Http://java.sun.com/jsp/jstl/core" %>

<! DOCTYPE HTML Public "-//w3c//dtdhtml 4.01 transitional//en" >

<title>my JSP ' Demo4. JSP' starting page</title>

<body>

Stringsename= (String) session.getattribute ("Sename");

Stringseuse= (String) session.getattribute ("Seuse");

</body>

Four: Application attribute range

<%@ page language="java"import="java.util.*" pageencoding="UTF-8"%>

<%@ taglib prefix="C"uri="Http://java.sun.com/jsp/jstl/core" %>

<! DOCTYPE HTML Public "-//w3c//dtdhtml 4.01 transitional//en" >

<title>my JSP ' jspobj.jsp ' starting page</title>

<body>

Application.setattribute ("Apname", "Application attribute range");

Application.setattribute ("Apuse", "Set on server Side");

<!--address change, client jumps--

<a href="demo4.jsp"> Hyperlinks Get Properties </a>

</body>

demo4.jsp

<%@ page language="java"import="java.util.*" pageencoding="UTF-8"%>

<%@ taglib prefix="C"uri="Http://java.sun.com/jsp/jstl/core" %>

<! DOCTYPE HTML Public "-//w3c//dtdhtml 4.01 transitional//en" >

<title>my JSP ' Demo4. JSP' starting page</title>

<body>

Stringapname= (String) application.getattribute ("Apname");

Stringapuse= (String) application.getattribute ("Apuse");

</body>

These are very basic concepts, they have to read more books, broaden their knowledge!

qq:1327880701

JSP four attribute ranges

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