基于JSP MVC模式的简单计算器

package sun.yourservlet; import moon.yourbean.*; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class HandleComputer extends HttpServlet { public void init(ServletConfig config) throws ServletException {super.init(config); } public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException { ComputerBean dataBean=null; HttpSession session=request.getSession(true); try{ dataBean=(ComputerBean)session.getAttribute("ok"); if(dataBean==null) { dataBean=new ComputerBean(); //创建Javabean对象 session.setAttribute("ok",dataBean);//将dataBean存储到session对象中 } } catch(Exception exp) { dataBean=new ComputerBean(); //创建Javabean对象 session.setAttribute("ok",dataBean);// 将dataBean存储到session对象中 } double numberOne=Double.parseDouble(request.getParameter("numberOne")); double numberTwo=Double.parseDouble(request.getParameter("numberTwo")); String operator=request.getParameter("operator"); double result=0; if(operator.equals("+")) { result=numberOne+numberTwo; } else if(operator.equals("-")) { result=numberOne-numberTwo; } else if(operator.equals("*")) { result=numberOne*numberTwo; } else if(operator.equals("/")) { result=numberOne/numberTwo; } dataBean.setNumberOne(numberOne); //将数据存储在dataBean中 dataBean.setNumberTwo(numberTwo); dataBean.setOperator(operator); dataBean.setResult(result); RequestDispatcher dispatcher= request.getRequestDispatcher("showResult.jsp"); dispatcher.forward(request, response);//请求showResult.jsp显示dataBean中的数据 } public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException { doPost(request,response); } }