关于JSP中的四种属性（page，request，session，application）在表达式中的属性范围

<%@ page contentType="text/html" pageEncoding="gbk"%>






<%
pageContext.setAttribute("info","111");
request.setAttribute("info","22");
session.setAttribute("info","33");
application.setAttribute("info","44");
%>
 

${info}

在JSP中写下如下代码，默认的会显示的值是111，输出的是page范围内的info的值

因此，该4个属性有4个专属的范围标记

如下代码

<%@ page contentType="text/html" pageEncoding="gbk"%>






<%
pageContext.setAttribute("info","111");
request.setAttribute("info","22");
session.setAttribute("info","33");
application.setAttribute("info","44");
%>
 

page属性内容:${pageScope.info}

request属性内容：${requestScope.inof}

session属性内容：${sessionScope.info}

application属性内容：${applicationScope.info}

显示的效果如下