JSP MVC模式计算三角形的面积.docx

web.xml handle star.moon.HandleData handle /handleDataTriangle.javapackage flower.grass;public class Triangle double sideA,sideB,sideC; double area;boolean isTriangle; public void setSideA(double a) sideA=a; public double getSideA() return sideA; public void setSideB(double b) sideB=b; public double getSideB() return sideB; public void setSideC(double c) sideC=c; public double getSideC() return sideC; public void setArea(double area) this.area=area; public double getArea() return area; public void setIsTriangle(boolean boo) isTriangle=boo; public boolean getIsTriangle() return isTriangle; input.jsp 输入三角形三边(提交给servlet去处理)： 边A: 边B: 边C: show.jsp 三角形的三边是：边A： 边B： 边C：这三个边能构成一个三角形吗？面积是： HandleData.javapackage rain.snow;import flower.grass.*;import java.io.*;import javax.servlet.*;import javax.servlet.http.*;public class HandleData extends HttpServlet public void init(ServletConfig config) throws ServletException super.init(config); public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException Triangle tri=new Triangle(); /创建Javabean对象 request.setAttribute(triangle,tri);/ 将tri存储到HttpServletRequest对象中 double a=Double.parseDouble(request.getParameter(sideA); double b=Double.parseDouble(request.getParameter(sideB); double c=Double.parseDouble(request.getParameter(sideC); double p=(a+b+c)/2.0; double area=Math.sqrt(p*(p-a)*(p-b)*(p-c); tri.setSideA(a); /将数据存储在tri中 tri.setSideB(b); /将数据存储在tri中 tri.setSideC(c); /将数据存储在tri中 tri.setArea(area); /将数据存储在tri中 if(a+bc&b+ca&a+cb) tri.setIsTriangle(true); else tri.setIsTriangle(false); RequestDispatcher dispatcher= request.getRequestDispatcher(/show.jsp); dispatcher.forward(request, response); /请求show.jsp显示tri中的数据 public void doGet(HttpServletRequest request,