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<FORM action="tom.jsp" method= “post” >
<INPUT type="text" name="boy" value= “ok” >
<INPUT TYPE="submit" value=" Ëͳö" name= “submit”>
</FORM>
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request.getParameter(“boy”);
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<%@ page contentType="text/html;charset=GB2312" %>
<HTML>
<BODY bgcolor=cyan><FONT size=1>
<FORM action="Example3_2.jsp" method=post name=form>
<INPUT type="text" name="girl">
<INPUT TYPE="submit" value="Enter" name="submit">
</FORM>
<%String textContent=request.getParameter("girl");
double number=0,r=0;
if(textContent==null)
{textContent="";
}
try{ number=Double.parseDouble(textContent);
if(number>=0)
{r=Math.sqrt(number) ;
out.print("<BR>"+String.valueOf(number)+" µÄƽ·½¸ù£º");
out.print("<BR>"+String.valueOf(r));
}
else
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import javax.servlet.FilterConfig;   
import javax.servlet.ServletException;   
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