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PageContext Object
This object represents the page context, which is used primarily to access shared data between JSPs.
PageContext is an instance of the PageContext class that uses PageContext to access variables in the page, request, session, application range.
GetAttribute (String name): Gets the Name property within the page range.
SetAttribute (String name, value, int scope): If no scope is specified, the property defaults to the page range, such as: Pagecontext.setattribute ("page", "Hello");
Use PageContext to set the property in the REQUEST scope Pagecontext.setattribute ("Request2", "Hello", pagecontext.request_scope);
Use PageContext to set the properties in the SESSION range Pagecontext.setattribute ("Session2", "Hello", pagecontext.session_scope);
Use PageContext to set properties in the application range Pagecontext.setattribute ("app2", "Hello", pagecontext.application_scope);
GetAttribute (String name,int scope): Gets the name attribute within the specified range, where scope can be the following 4 values:
Pagecontext.page_scope: Corresponds to the PAGE range.
Pagecontext.request_scope: Corresponds to the REQUEST range.
Pagecontext.session_scope: Corresponds to the SESSION range.
Pagecontext.application_scope: Corresponds to the application range.
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Instance:
<% @page contenttype= "text/html;charset=gb2312"%>
<body><br>
<%
Use PageContext to set the property, which defaults to the page range
Pagecontext.setattribute ("name", "Jason Test");
Request.setattribute ("name", "Lin Yuan Programming");
Session.setattribute ("name", "Lin yuan computer Programming technical training");
Session.putvalue ("name", "Computer Programming");
Application.setattribute ("name", "training");
%>
Page Set Value: <%=pagecontext.getattribute ("name")%><br>
Request Set Value: <%=pagecontext.getrequest (). getattribute ("name")%><br>
Session Set Value: <%=pagecontext.getsession (). getattribute ("name")%><br>
Application Set Value: <%=pagecontext.getservletcontext (). getattribute ("name")%><br>
Value within range 1: <%=pagecontext.getattribute ("name", 1)%><br>
Value within range 2: <%=pagecontext.getattribute ("name", 2)%><br>
Value within range 3: <%=pagecontext.getattribute ("name", 3)%><br>
Value within range 4: <%=pagecontext.getattribute ("name", 4)%><br>
<!--start with the smallest range page, then the Reques, session, and Application-->
<%pagecontext.removeattribute ("name", 3);%>
PageContext the modified session setting Value: <%=session.getvalue ("name")%><br>
<%pagecontext.setattribute ("name", "Applied Technology Training", 4);%>
PageContext modified Application Set Value: <%=pagecontext.getservletcontext (). getattribute ("name")%><br>
Lookup of the value: <%=pagecontext.findattribute ("name")%><br>
Property name Range: <%=pagecontext.getattributesscope ("name")%><br>
</body>
Page Display results:
Page Set value: Jason Test
Value set by request: Lin Yuan programming
Session setting value: Lin Yuan computer programming technology training
Application Set Value: Training
Value in range 1: Jason test
Value within range 2: Lin Yuan programming
Value within range 3: Lin Yuan computer programming technical training
Values within range 4: Training
PageContext the value of the modified session setting: null
PageContext modified Application Set Value: Application Technical Training
Lookup of values: Jason Test
Property name Range: 1
Use of PageContext objects
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