简易Servlet计算器1.0

编写一个简易的Servlet计算器,暂时仅能实现 + - * / % 五种运算

jsp界面：

 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=UTF-8">
 7 <title>Servlet计算器</title>
 8 </head>
 9 <body>
10 <form action="TestJSQ" method="post">
11     <input type="text" name="shu1">
12     <input type="text" name="yunsuan" style="font-size: 12px; width: 12px;">
13     <input type="text" name="shu2">
14     <input type="submit" value="=">
15 
16 </form>
17 </body>
18 </html>

View Code

Servlet程序：

 1 package com.sp.web;
 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 public class Test_JSQ extends HttpServlet {
10     private static final long serialVersionUID = 1L;
11 
12     public Test_JSQ() {
13         super();
14 
15     }
16 
17     protected void doGet(HttpServletRequest request, HttpServletResponse response)
18             throws ServletException, IOException {
19 
20         response.setCharacterEncoding("UTF-8");
21         response.setContentType("text/html");
22         Double num1 = Double.parseDouble(request.getParameter("shu1"));
23         Double num2 = Double.parseDouble(request.getParameter("shu2"));
24         String ysf = request.getParameter("yunsuan");
25 
26         Double jg = 0.0;
27         if (ysf.equals("+")) {
28             jg = num1 + num2;
29             response.getWriter().write(num1 + " + " + num2 + " = " + jg);
30         } else if (ysf.equals("-")) {
31             jg = num1 - num2;
32             response.getWriter().write(num1 + " － " + num2 + " = " + jg);
33         } else if (ysf.equals("*")) {
34             jg = num1 * num2;
35             response.getWriter().write(num1 + " × " + num2 + " = " + jg);
36         } else if (ysf.equals("/")) {
37             if (num2 != 0) {
38                 jg = num1 / num2;
39                 response.getWriter().write(num1 + " ÷ " + num2 + " = " + jg);
40             } else {
41                 response.getWriter().write("除数不能为零");
42             }
43         } else if (ysf.equals("%")) {
44             jg = num1 % num2;
45             response.getWriter().write(num1 + " % " + num2 + " = " + jg);
46         }
47         
48         
49     }
50 
51     protected void doPost(HttpServletRequest request, HttpServletResponse response)
52             throws ServletException, IOException {
53 
54         doGet(request, response);
55     }
56 
57 }

View Code

运行：

简易Servlet计算器1.0

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