惠州​JSP的生命周期是什么？_北大青鸟IT学校

JSP的生命周期是什么？相信学过Java的同学都遇到过这个问题，那么答案是什么呢？接下来一起来看看惠州北大青鸟老师是怎么回答的。

Compilation

Initialization

Execution

Cleanup

详细解释

Compilation: When a browser asks for a JSP, the JSP engine first checks to see whether it needs to compile the page. If the page has never been compiled, or if the JSP has been modified since it was last compiled, the JSP engine compiles the page.

编译的三个步骤:

Parsing the JSP.

Turning the JSP into a servlet.

Compiling the servlet.

Initialization: When a container loads a JSP it invokes the jspInit() method before servicing any requests

Execution: Whenever a browser requests a JSP and the page has been loaded and initialized, the JSP engine invokes the _jspService() method in the JSP.The _jspService() method of a JSP is invoked once per a request and is responsible for generating the response for that request and this method is also responsible for generating responses to all seven of the HTTP methods ie. GET, POST, DELETE etc.

Cleanup: The destruction phase of the JSP life cycle represents when a JSP is being removed from use by a container.The jspDestroy() method is the JSP equivalent of the destroy method for servlets.

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Java

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