//Circle.java package beans; public class Circle { private double radius; private double zhouchang; private double area; public double getRadius() { return radius; } public void setRadius(double radius) { this.radius = radius; } public double getZhouchang() { return 2*Math.PI*radius; } public void setZhouchang(double zhouchang) { this.zhouchang = zhouchang; } public double getArea() { return Math.PI*radius*radius; } public void setArea(double area) { this.area = area; } }
//input.jsp <%@ page language="java" pageEncoding="UTF-8"%> <form action="show.jsp" method="post"> <h3>请输入圆的半径：</h3> <table> <tr><td align="right">半径：</td> <td><input name="radius"></td> </tr> <tr><td></td> <td><input type="submit" value="提交"></td> </tr> </table> </form>
//show.jsp <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <html> <head> <title>利用JavaBean+JSP求圆的周长和面积</title> </head> <body> <jsp:useBean id="a" class="beans.Circle" scope="request"/> <jsp:setProperty name="a" property="*"/> <h3>调用jsp:getProperty作标签显示结果：</h3><br> <h5> 圆的周长： <jsp:getProperty name="a" property="zhouchang"/><br> 圆的面积： <jsp:getProperty name="a" property="area"/> </h5> </body> </html>
