本文探讨了JSP中的四个作用域与ServletContext、HttpSession、HttpServletRequest、PageContext的关系，并详细解析了Servlet如何由容器初始化及其顺序。同时，文中还讨论了如何在JSP或Servlet中使用getSession方法获取会话及将变量放入作用域的方法。
The jsp four scopes are same with ServletContext,HttpSession,HttpServletRequest,PageContext?
How servlet is initialized by servlet container,is also order?
In a jsp or servlet,getSession method what can get, and how could put variable into scope(How do declare scope for variable?)?
Now they are my question,go on.......................................................................
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