编写一个简易的Servlet计算器,暂时仅能实现 + - * / % 五种运算
jsp界面：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Servlet计算器</title>
</head>
<body>
<form action="TestJSQ" method="post">
<input type="text" name="shu1">
<input type="text" name="yunsuan" style="font-size: 12px; width: 12px;">
<input type="text" name="shu2">
<input type="submit" value="="> </form>
</body>
</html>
Servlet程序：
package com.sp.web; import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; public class Test_JSQ extends HttpServlet {
private static final long serialVersionUID = 1L; public Test_JSQ() {
super(); } protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { response.setCharacterEncoding("UTF-8");
response.setContentType("text/html");
Double num1 = Double.parseDouble(request.getParameter("shu1"));
Double num2 = Double.parseDouble(request.getParameter("shu2"));
String ysf = request.getParameter("yunsuan"); Double jg = 0.0;
if (ysf.equals("+")) {
jg = num1 + num2;
response.getWriter().write(num1 + " + " + num2 + " = " + jg);
} else if (ysf.equals("-")) {
jg = num1 - num2;
response.getWriter().write(num1 + " － " + num2 + " = " + jg);
} else if (ysf.equals("*")) {
jg = num1 * num2;
response.getWriter().write(num1 + " × " + num2 + " = " + jg);
} else if (ysf.equals("/")) {
if (num2 != 0) {
jg = num1 / num2;
response.getWriter().write(num1 + " ÷ " + num2 + " = " + jg);
} else {
response.getWriter().write("除数不能为零");
}
} else if (ysf.equals("%")) {
jg = num1 % num2;
response.getWriter().write(num1 + " % " + num2 + " = " + jg);
} } protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { doGet(request, response);
} }
运行：
