<%
String s=request.getParameter(report_type);
if(s==null){
%><Form mothod="post" action="yourself page"...<% } %>
<%
else {
out.print(s);
}%>
String s=request.getParameter(report_type);
if(s==null){
%><Form mothod="post" action="yourself page"...<% } %>
<%
else {
out.print(s);
}%>
刷了?那还怎么得到?
if(report_type!=null){
out.write(report_type);
}