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2025-09-23 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Development >
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This article mainly shows you "what is the object of the four domains of JavaWeb", the content is simple and clear, and I hope it can help you solve your doubts. Let me lead you to study and learn this article "what are the objects of the four domains of JavaWeb?"
one。 Introduction
There are four domain objects in JavaWeb. According to their scope of action, they are PageContext, Request, Session and application. The following is mainly for the scope of action, life cycle are introduced.
two。 PageContext
a. Scope of action
Next to PageContext, there is only one request, which is mainly used for request forwarding.
b. Life cycle
It is created by the server before the service method call; at the end of the request, the end of the life cycle is destroyed.
four。 Session
a. Scope of action
The scope of action is the largest, and the scope is limited to the current web application; as long as the property is set in one place, the jsp or servlet in other places can be obtained, and the corresponding ServletContext object in servlet
b.
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