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使用MVC实现计算器功能
一：View cal.jsp
1 <%@page language="java" contentType="text/html; charset=utf-8" 2 pageEncoding="utf-8"%> 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> 7 <title>采用三目运算符获取运算符</title> 8 </head> 9 <body>10 <form action="CalServlet" method="post" >11 操作数1：<input type="text" name="num1" value="${requestScope.newCal.num1}"><br>12 运算： <input type="radio" name="op" value="+" ${requestScope.newCal.op=="+"? "checked": " "}>+13 <input type="radio" name="op" value="-" ${requestScope.newCal.op=="-"? "checked" : " "}>-14 <input type="radio" name="op" value="*" ${requestScope.newCal.op=="*"? "checked" : " "}>*15 <input type="radio" name="op" value="/" ${requestScope.newCal.op=="/"? "checked" : " "}>/<br> 16 操作数2：<input type="text" name="num2" value="${requestScope.newCal.num2}"><br>17 <input type="submit" value="计算" ><br>18 结果：<input type="text" value="${requestScope.newResult}">19 </form>20 </body>21 </html>
二：Model Calculator.java
1 package nuc.sw.cal.bean; 2 3 public class Calculator { 4 private float num1; 5 private String op; 6 private float num2; 7 public float getNum1() { 8 return num1; 9 }10 public void setNum1(float num1) {11 this.num1 = num1;12 }13 public String getOp() {14 return op;15 }16 public void setOp(String op) {17 this.op = op;18 }19 public float getNum2() {20 return num2;21 }22 public void setNum2(float num2) {23 this.num2 = num2;24 }25 26 }
三：CalServlet.java
1 package nuc.sw.cal.servlet; 2 3 import java.io.IOException; 4 import javax.servlet.ServletException; 5 import javax.servlet.http.HttpServlet; 6 import javax.servlet.http.HttpServletRequest; 7 import javax.servlet.http.HttpServletResponse; 8 9 import nuc.sw.cal.bean.Calculator;10 11 /**12 * Servlet implementation class CalServlet13 */14 public class CalServlet extends HttpServlet {15 private static final long serialVersionUID = 1L;16 17 /**18 * @see HttpServlet#HttpServlet()19 */20 public CalServlet() {21 super();22 // TODO Auto-generated constructor stub23 }24 25 /**26 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)27 */28 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {29 // TODO Auto-generated method stub30 response.getWriter().append("Served at: ").append(request.getContextPath());31 }32 33 /**34 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)35 */36 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {37 // TODO Auto-generated method stub38 39 //form中method若由get改变为post,只需在doPost里调用doGet方法doGet(request, response);就可以，不需要重新写方法。40 //第一次请求为Get 之后为Post41 42 //接受表单提交的数据，并将数据封装在bean中43 Calculator cal=new Calculator();44 45 cal.setNum1(Float.parseFloat(request.getParameter("num1")));46 cal.setOp(request.getParameter("op"));47 cal.setNum2(Float.parseFloat(request.getParameter("num2")));48 49 float result=0;50 switch(cal.getOp().charAt(0)){51 //根据运算符做相应的操作52 case ‘+‘:53 result=cal.getNum1()+cal.getNum2();54 break;55 case ‘-‘:56 result=cal.getNum1()-cal.getNum2();57 break;58 case ‘*‘:59 result=cal.getNum1()*cal.getNum2();60 break;61 case ‘/‘:62 result=cal.getNum1()/cal.getNum2();63 }64 65 //将对象和结果保存到request域中66 //之后的模型中时常会用到传递 整个对象67 request.setAttribute("newCal",cal);68 request.setAttribute("newResult",result);69 //以服务器端跳转页面70 request.getRequestDispatcher("cal.jsp").forward(request, response);71 72 /*73 1.服务器端跳转 作用域为request 有返回结果而且地址栏改变，变为现页面 请求转发74 request.getRequestDispatcher("cal.jsp").forward(request, response);75 2.客户端跳转（2次请求） 作用域为session 无返回结果而且地址栏不变，仍是前一个页面 请求重定向 76 request.sendRedirect("cal.jsp");77 */78 }79 80 }
四：项目建立结果及运行结果：
使用MVC实现计算器功能
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