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<%
private String greeting;
greeting = config.getInitParemater("greet")//在web.xml中配置了<init-param>
%>
<c:set var="username">
${param.username}
</c:set>
<c:out>
${username}+${greeting}
</c:out>
private String greeting = config.getInitParemater("greet")//在web.xml中配置了<init-param>
request.setAttribute("greeting", greeting);
<c:set var="username">
${param.username}
</c:set>
<c:out>
${username}+${greeting}
</c:out>