用JSP实现一个简单的计算器
index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><html> <head> <!-- 用户提交验证 --> <script type="text/javascript" language="javascript"> <!-- function checkNum(){ if(form1.num1.value==""){ window.alert("num1 值不能为空 ！！哈哈"); return false; } //判断num1是不是一个数 if(Math.round(form1.num1.value)!=(form1.num1.value)){ window.alert("num1不是一个整数") return false; } if(form1.num2.value==""){ window.alert("num2 值不能为空 ！！哈哈"); return false; } //判断num2是不是一个数 if(Math.round(form1.num2.value)!=(form1.num2.value)){ window.alert("num2不是一个整数") return false; } } --> </script> </head> <h1>我的计算器</h1> <hr> <body> <form name ="form1" action="result.jsp" method ="post"> <input type="text" name ="num1" ></input><br> <select name="flag"> <option value=+>+</option> <option value=->-</option> <option value=*>*</option> <option value=/>/</option> </select><br> <input type="text" name="num2"/></input><br> <input type="submit" value="提交" onclick="return checkNum();"></input> </form> <hr> </body></html>
result.jsp用于显示结果
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> </head> <body> <% String num1=request.getParameter("num1"); String num2 = request.getParameter("num2"); String flag = request.getParameter("flag"); int s_num1=Integer.parseInt(num1); int s_num2=Integer.parseInt(num2); int result=0; if(flag.equals("+")){ //加 result=s_num1+s_num2; }else if(flag.equals("-")){ //减 result=s_num1-s_num2; }else if(flag.equals("/")){ result=s_num1/s_num2; //除 }else{ //乘 result=s_num1*s_num2; } out.println("结果是："+result); %> </body></html>