hi everyone:
it seems to have difference among the following three code:
<% if ( %>
<jsp:getProperty name="hello" property="usename" />
<% != null ) { %>
<% if ( hello.getusename() != null ) %>
<% if ( request.getParameter("usename") != null ) %>
the first doesnot work at all, the second is fine and the last cannot
identifies "null". the last one always thinks "null" as "".
thanks
liu hao
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