简易servlet计算器

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<%@ 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>Insert title here</title>

</head>

<body>

<form action="jisuanqi" method="post">

<textarea id="text" name="textarea" style="width:200px; height:20px;"></textarea>

<br>

<input type="button" value="7" name="7" onclick="javascript:Insert('7')">

<input type="button" value="8" name="8" onclick="javascript:Insert('8')">

<input type="button" value="9" name="9" onclick="javascript:Insert('9')">

<input type="button" value=" +" name="jia" onclick="javascript:Insert('+')">

<br>

<input type="button" value="4" name="4" onclick="javascript:Insert('4')">

<input type="button" value="5" name="5" onclick="javascript:Insert('5')">

<input type="button" value="6" name="6" onclick="javascript:Insert('6')">

<input type="button" value=" -" name="jian" onclick="javascript:Insert('-')">

<br>

<input type="button" value="1" name="1" onclick="javascript:Insert('1')">

<input type="button" value="2" name="2" onclick="javascript:Insert('2')">

<input type="button" value="3" name="3" onclick="javascript:Insert('3')">

<input type="button" value=" ×" name="cheng" onclick="javascript:Insert('*')">

<br>

<input type="button" value="0" name="0" onclick="javascript:Insert('0')">

<input type="button" value=" ." name="." onclick="javascript:Insert('.')">

<input type="submit" value="=" name="deng">

<input type="button" value=" ÷" name="chu" onclick="javascript:Insert('/')">

</form>

</body>

<script language="javascript">

function Insert(str) {

var obj = document.getElementById('text');

if(document.selection) {

obj.focus();

var sel=document.selection.createRange();

document.selection.empty();

sel.text = str;

} else {

var prefix, main, suffix;

prefix = obj.value.substring(0, obj.selectionStart);

main = obj.value.substring(obj.selectionStart, obj.selectionEnd);

suffix = obj.value.substring(obj.selectionEnd);

obj.value = prefix + str + suffix;

}

obj.focus();

}         

</script>

</html>

package com.hanqi.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 jisuanqi extends HttpServlet {

    private static final long serialVersionUID = 1L;

    public jisuanqi() {

        super();

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        String str=request.getParameter("textarea");

        try
        {

        if(str.length()!=str.replace("+", "").length())

        {

            String a=str.substring(0,1);

            String b=str.substring(1+1,str.length());

            response.getWriter().write(str+"="+( Double.parseDouble(a)+ Double.parseDouble(b)));

        }

        if(str.length()!=str.replace("-", "").length())

        {

            String c=str.substring(0,str.indexOf("-"));

            String d=str.substring(str.indexOf("-")+1,str.length());

            response.getWriter().write(str+"="+( Double.parseDouble(c)- Double.parseDouble(d)));

        }

        if(str.length()!=str.replace("*", "").length())

        {

            String e=str.substring(0,str.indexOf("*"));

            String f=str.substring(str.indexOf("*")+1,str.length());

            response.getWriter().write(str+"="+( Double.parseDouble(e)* Double.parseDouble(f)));

        }

        if(str.length()!=str.replace("/", "").length())

        {

            String g=str.substring(0,str.indexOf("/"));

            String h=str.substring(str.indexOf("/")+1,str.length());

            response.getWriter().write(str+"="+( Double.parseDouble(g)/ Double.parseDouble(h)));

        }

}catch(Exception e)
{
response.getWriter().write("请正确使用计算器");
}
}

    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        doGet(request, response);

    }

}