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out.print(a);
else
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<form method="post" action="test.jsp">
<input type="text" name="text">
<input type="submit" name="submit" value="È·¶¨">
</form>
<%@ page language="java"%>
<%
if (request.getParameter("submit") != null) {
String a = request.getParameter("text");
if (a != null && !"".equals(a)) {
out.print(a);
} else {
out.print("¾¯¸æ:²»ÄÜΪ¿Õ");
}
}
%>
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