What are the built-in objects and functions of jsp?

This article mainly introduces jsp objects and functions to you. I hope it will be helpful to friends in need!

JSP has a total of 9 built-in objects:

request Client request, this request will Contains parameters from GET/POST requests;

response The response from the web page returned to the client;

pageContext The properties of the web page are managed here;

session The session related to the request;

application servlet The content being executed;

out Output used to transmit responses;

Architectural components of config servlet;

page JSPThe web page itself;

exception Uncaught exception for error web pages.

Function:

Page refers to the object that JSP is translated into Servlet Reference.

pageContext object can be used to obtain other 8 built-in objects, and can also be used as a JSP domain scope object. The value stored in .pageContext is the current one. Scope of the page》

request represents the request object, which can be used to obtain client information or can be used as a domain object. Use request to save it. The data is valid within the scope of a request.

Session represents a session, which can be used to save the user's private information or as a domain object. The data saved using session is stored in a session. The scope is valid

Application: represents the entire application scope. The data saved using this object is valid in the entire web application.

Response is the response object, which represents the response data from the server to the browser.

Out:JSPWriter is used to output content to the page The object

Config: refers to ServletConfig which is used to obtain the configuration of Servlet after JSP is translated into Servlet Object.

Exception: Set isErrorPage="true" in the page, and it can be used. It is a reference to Throwable. Used to obtain Page error message.

Related recommendations: "JSP Tutorial"

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