rect.jsp
com.jsp
<%
String width = request.getParameter("width");
String height = request.getParameter("height");.
int w = Integer.parseInt(width==null||"".equals(widht)?"0":width);
int h = Integer.parseInt(height==null||"".equals(height)?"0":height);
int area = w*h;
%>
面积为<%=String.valueOf(area) %>
