What are the commonly used built-in objects in jsp?

There are eight commonly used built-in objects in jsp: "request", "response", "ession", "application", "out", "page", "config" and "pageContext": 1. request, which represents The client's request; 2. response, represents the server's response to the client; 3. session, represents the user's session; 4. application, represents the context of the current Web application, etc.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

In JSP (JavaServer Pages), there are some commonly used built-in objects that can be accessed directly in JSP pages without additional declarations. These built-in objects include:

1. request: represents the client's request and can be used to obtain the parameters, attributes and other information submitted by the client.

2. response: Represents the server's response to the client. It can be used to set the content type of the response, write response data, etc.

3. session: Represents the user's session (session), which can be used to track the user's status information, such as login status, etc.

4. application: Represents the context of the current web application and can be used to share data across the entire application.

5. out: used to output data to the client, equivalent to response.getWriter().

6. page: Represents the instance of the current JSP page and can be used to call the methods of the page itself.

7. config: Represents the configuration information of the current JSP page and can be used to obtain initialization parameters, etc.

8. pageContext: Represents the context information of the entire page, through which properties in other scopes can be accessed.

These built-in objects can help developers conveniently handle requests, responses, and shared data operations in JSP pages.

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