These nine built-in objects will be instantiated by the container for the user, and the user can use it directly, instead of using the keyword new to instantiate the object as in Java.
The first five red-marked objects can be developed after they are mastered. As the key points, the others should also be the key points. They are often asked during interviews and often encountered in future development.
6--Introduction to built-in objects in JSP
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Origin blog.csdn.net/qwy715229258163/article/details/114011218
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