jsp复习题

边A：

b)servlet类为HandleArea.java package myservlet.control;

public class HandArea extends HttpServlet { public void init(ServletConfig config) throws ServletException {

super.init(config); }

public void doGet(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

doPost（request，response） }

public void doPost(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

Area dataBean=new Area();

HttpSession session=request.getSession(true); session.setAttribute(\ try { double

a=Double.parseDouble(request.getParameter(\ double

b=Double.parseDouble(request.getParameter(\ double

c=Double.parseDouble(request.getParameter(\ dataBean.setA(a); dataBean.setB(b); dataBean.setC(c); double s=-1;

double p=(a+b+c)/2.0;

s=Math.sqrt(p*(p-a)*(p-b)*(p-c)); dataBean.setArea(s);

dataBean.setMess(\三角形\ } catch (Exception e) { dataBean.setArea(-1); dataBean.setMess(\ }

response.sendRedirect(\重定向方法 } }

c)web.xml

handle

myservlet.control.HandArea

handle /handleArea

d)javabean文件为Area.java package mybean.data;

public class Area { double a,b,c,area; String mess;

public String getMess() { return mess; }

public void setMess(String mess) { this.mess = mess; }

public double getA() { return a; }

public void setA(double a) { this.a = a; }

public double getB() { return b; }

public void setB(double b) { this.b = b; }

public double getC() { return c; }

public void setC(double c) { this.c = c; }

public double getArea() { return area; }

public void setArea(double area) { this.area = area; } }

17、编写一个JSP页面，该页面提供一个表单，用户可以通过表单输入梯形的上底、下底、高的值，并提交给JSP页面，该JSP页面将计算梯形的面积之任务交给一个bean去完成。JSP页面使用

getProperty动作标记显示梯形的面积。 ①bean命名为Ladder.java package mybean.data; public class Ladder {

double a=0,b=0,c=0,area=-1; public double getA() { return a; }

public void setA(double a) { this.a = a; }

public double getB() { return b; }

public void setB(double b) { this.b = b; }

public double getC() { return c; }

public void setC(double c) { this.c = c; }

public double getArea() { area=(a+b)*c/2.0; return area; } }

②JSP页面命名为ladder.jsp

< HTML >

输入梯形上底、下底和高：

上底：