JSP简单练习-EL表达式操作JavaBean

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/* * javaBean代码 */package bean;public class Box {double length;double width;double height;public Box(){length=0;width=0;height=0;}public double getLength() {return length;}public void setLength(double length) {this.length = length;}public double getWidth() {return width;}public void setWidth(double width) {this.width = width;}public double getHeight() {return height;}public void setHeight(double height) {this.height = height;}public double getArea(){return length*width*2+length*height*2+width*height*2;}public double getVolum(){return length*width*height;}}

<!-- useBox.jsp文件 --><%@ page language="java" contentType="text/html; charset=gb2312" %><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><html><head><title>用EL使用JavaBean</title></head><body><% bean.Box box=new bean.Box();box.setLength(40);box.setWidth(20);box.setHeight(30);request.setAttribute("box", box);%>盒子的表面积为:${box.area }<br><c:set var="volum" value="volum" />盒子的容积为:${box[volum] }<br></body></html>

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