Jsp的作用域
2016-07-13 09:30
507 查看
作用域：
（1）pageContext:
（2）request：有两个文档，一个转发的，一个接收的，不过说实话，我现在也不知道他用来干什么。
NewFile:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!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=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
String name=(String)request.getAttribute("name");
int age=(int)request.getAttribute("age");
%>
<font>姓名：<%=name %> 年龄：<%=age %></font>
</body>
</html>NewFile1:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!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=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
request.setAttribute("name", "小张");
request.setAttribute("age", 10);
%>
<jsp:forward page="NewFile.jsp"></jsp:forward>
</body>
</html>
（3）session:这里面不需要转发，直接储存在服务器里了
NewFile:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!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=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
String name=(String)session.getAttribute("name");
int age=(int)session.getAttribute("age");
%>
<font>姓名：<%=name %> 年龄：<%=age %></font>
</body>
</html>
NewFile1:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!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=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
session.setAttribute("name", "小张 ");
session.setAttribute("age", 10);
%>
</body>
</html>
（4）Application：
NewFile:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!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=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
String name=(String)application.getAttribute("name");
int age=(int)application.getAttribute("age");
%>
<font>姓名：<%=name %> 年龄：<%=age %></font>
</body>
</html>NewFile1:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!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=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
application.setAttribute("name", "小张 ");
application.setAttribute("age", 10);
%>
</body>
</html>
（1）pageContext:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!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=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
pageContext.setAttribute("name", "小张");
pageContext.setAttribute("age", 10);
%>
<%
String name=(String)pageContext.getAttribute("name");
int age=(int)pageContext.getAttribute("age");
%>
<font>姓名：<%=name %> 年龄：<%=age %></font>
</body>
</html>（2）request：有两个文档，一个转发的，一个接收的，不过说实话，我现在也不知道他用来干什么。
NewFile:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!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=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
String name=(String)request.getAttribute("name");
int age=(int)request.getAttribute("age");
%>
<font>姓名：<%=name %> 年龄：<%=age %></font>
</body>
</html>NewFile1:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!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=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
request.setAttribute("name", "小张");
request.setAttribute("age", 10);
%>
<jsp:forward page="NewFile.jsp"></jsp:forward>
</body>
</html>
（3）session:这里面不需要转发，直接储存在服务器里了
NewFile:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!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=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
String name=(String)session.getAttribute("name");
int age=(int)session.getAttribute("age");
%>
<font>姓名：<%=name %> 年龄：<%=age %></font>
</body>
</html>
NewFile1:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!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=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
session.setAttribute("name", "小张 ");
session.setAttribute("age", 10);
%>
</body>
</html>
（4）Application：
NewFile:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!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=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
String name=(String)application.getAttribute("name");
int age=(int)application.getAttribute("age");
%>
<font>姓名：<%=name %> 年龄：<%=age %></font>
</body>
</html>NewFile1:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!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=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
application.setAttribute("name", "小张 ");
application.setAttribute("age", 10);
%>
</body>
</html>
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