JSP EL 表达式
有困难，找猪八戒# ${param.test} --> request.getParameter("test")
# ${requestScope.test} --> request.getAttribute("test");
# ${sessionScope.test} --> session.getAttribute("test");
# ${applicationScope.test} --> application.getAttribute("test"};
# ${pageScope.test} --> pageContext.getAttribute("test"};
# ${test} --> pageContext.findAttribute("test");
有困难，找猪八戒
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