上一节课我们通过一个案例三种实现，教你理解Jsp、javabean、Servlet（精），今天我们仍然通过同一个案例求圆的面积，使用MVC：jsp+javabean+servlet来实现，深入理解MVC及Jsp、javabean、Servlet的分工和使用。
r5.jsp
<form action="servletCircle" Method="post" > 输入圆的半径:<Input type=text name="r"> <Input type=submit value="提交"> </form>
JavaBean :NewCircle.java
编写求圆面积的JavaBean
package com.bean;
public class NewCircle {
double r,circleArea;
public double getR() { return r; }
public void setR(double r) { this.r = r; }
public double getCircleArea() {
circleArea=Math.PI*r*r;
return circleArea ;}
}
servlet:servletCircle.java
package com.servlet;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import com.bean.NewCircle;
public class servletCircle extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
double r=Double.parseDouble(request.getParameter("r"));
NewCircle circle=new NewCircle();
circle.setR(r);
out.print(circle.getCircleArea());
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
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