Javabean实现求圆的面积方法二
r2.jsp页面略
circle2.jsp
<jsp:useBean id="circle" class="com.bean.NewCircle" scope="page"/>
<%
double r=Double.parseDouble(request.getParameter("r"));
circle.setR(r);
%>
<BR>圆的面积：<%=circle.getCircleArea() %>
<jsp:getProperty name="circle" property="circleArea"/>
三、servlet实现求圆的面积
以下部分内容隐藏，请发表评论后查看！
r4.jsp
<form action="servletR" Method="post" > 输入圆的半径:<Input type=text name="r"> <Input type=submit value="提交"> </form>
servletR.java
package com.servlet;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class servletR extends HttpServlet {
public void service(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>");
try { double r=Double.parseDouble(request.getParameter("r"));
double circleArea=Math.PI*r*r;
out.println("<BR>圆的面积是："+circleArea);
} catch(NumberFormatException e)
{ out.println("<BR>请输入数字字符"); }
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();}
}
web.xml
<servlet>
<servlet-name>servletR</servlet-name>
<servlet-class>com.servlet.servletR</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>servletR</servlet-name>
<url-pattern>/servletR</url-pattern>
</servlet-mapping>
永哥通过一个简单案例（求圆的面积）分别使用Jsp、javabean、Servlet三种方法来实现，让你深入理解Jsp、javabean、Servlet，并学会它们的使用，下一节课，仍然通过这个案例，教大家综合使用jsp+javabean+servlet实现求圆的面积。
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