Question

el中与jsp的page对应的el隐含对象是哪一个

Answer 1

楼上是正解，JSP的隐藏对象 page 对应的是 pageScope

Answer 2

param 获取 Parameter参数
<c:choose>
<c:when test="${empty param.name}">
Please enter your name.
</c:when>

<c:otherwise>
Hello <b><c:out value="${param.name}" /></b>!
</c:otherwise>
</c:choose>

一般而言，我们在取得用户的请求参数时，可以利用下列方法：
request.getParameter(String name)
request.getParameterValues(String name)
在EL中则可以使用param和paramValues两者来取得数据。
${param.name}
${paramValues.name}可以取得所有同名参数的值
${paramValues.hobbies[0]}可以通过指定下标来访问特定的参数的值

Answer 3

SP隐含对象
Type
Scope
常用的方法

request Subclass of javax.servlet.ServletRequest Request getAttribute, getParameter, getParameterNames, getParameterValues, setAttribute
response Subclass of javax.servlet.ServletResponse Page Not typically used by JSP page authors
pageContext javax.servlet.jsp.PageContext Page findAttribute, getAttribute, getAttributesScope, getAttributeNamesInScope, setAttribute
session javax.servlet.http.HttpSession Session getAttribute, getId, setAttribute
application javax.servlet.ServletContext Application getAttribute, getMimeType, getRealPath, setAttribute
out javax.servlet.jsp.JspWriter Page clear, clearBuffer, flush, getBufferSize, getRemaining
config javax.servlet.ServletConfig Page getInitParameter, getInitParameterNames
page java.lang.Object Page Not typically used by JSP page authors
exception java.lang.Throwable Page getMessage, getLocalizedMessage, printStackTrace, toString

Answer 4

pageScope