用JSP做可以实现计算矩形和圆的面积

main.jsp
<%@ page contentType="text/html; charset=GB2312" %>


<% double radius=6;
%>

加载circle.jsp计算半径为<%=radius%>的圆的面积:



<% double a=10,b=20,c=30;
%>

加载ladder.jsp计算上底，下底，高分别为<%=a%><%=b%><%=c%>的梯形的面积:










ladder.jsp
<%@ page contentType="text/html;charset=GB2312" %>


<%! public String getArea(double a,double b,double c)

{double area = (a+b)*c/2;
return ""+area;}

%>
<% String sideA=request.getParameter("sideA");
String sideB=request.getParameter("sideB");
String sideC=request.getParameter("sideC");
double a=Double.parseDouble(sideA);
double b=Double.parseDouble(sideB);
double c=Double.parseDouble(sideC);
%>

梯形的面积：<%=getArea(a,b,c)%>



circle.jsp
<%@ page contentType="text/html;charset=GB2312" %>


<%! public String getArea(double radius)

{ double area=radius*radius*Math.PI;
return ""+area;
}

%>
<% String r=request.getParameter("r");
double radius=Double.parseDouble(r);
%>

圆的面积：<%= getArea(radius)%>