【Servlet】根据用户输入的圆半径，输出圆面积
来源：互联网 发布：用不到算法 编辑：程序博客网 时间：2024/06/05 13:23
1、创建Servlet类
import java.io.*;import javax.servlet.ServletException;import javax.servlet.http.*;public class CircleServlet extends HttpServlet{public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException,IOException{response.setContentType("text/html; charset=bg2312" );PrintWriter out = response.getWriter();double r = Double.parseDouble(request.getParameter("r"));out.println(" 面积 = " + Math.PI*r*r);out.close();}}
2、改写配置文件web.xml
<servlet><servlet-name>CircleServlet</servlet-name><servlet-class>myDemo.CircleServlet</servlet-class></servlet><servlet-mapping><servlet-name>CircleServlet</servlet-name><url-pattern>/calcu</url-pattern></servlet-mapping>
3、编写jsp调用servlet
<form action="calcu" method ="get"> <%--clacu对应的是servlet的URL,调用CircleServlet --%>圆的半径:<input type="text" name="r"><br/><input type="submit" value="计算"></form>
