clac.jsp
<%@ page language="java" contentType="text/html; charset=EUC-KR" pageEncoding="EUC-KR"%>
<%
String re = request.getParameter("result");
%>
<!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=EUC-KR">
<TITLE>계산기</TITLE>
</HEAD>
<BODY>
<H3>계산기</H3>
<HR>
<form name=form1 method=post action="calcResult.jsp"> <!-- requert(던지다,요청) -> calcResult -->
<input TYPE="text" NAME="num1" width=200 size="5">
<select NAME = "operator"> <!-- operator -> calcResult로 넘겨줌 -->
<option selected>+</option>
<option>-</option>
<option>*</option>
<option>/</option>
</select>
<INPUT TYPE="text" NAME="num2" width=200 size="5">
<input type="submit" value="계산" name="B1"> <!-- type = submit 은 값을 넘긴다. -->
<input type="reset" value="다시 입력" name="B2">
</form>
<HR>
계산결과 : <%=re%>
<hr>
</body>
</html>
calcResult.jsp
<%@ page language="java" contentType="text/html; charset=EUC-KR"
pageEncoding="EUC-KR"%>
<% int result = 0;
if(request.getMethod().equals("POST")){
String op = request.getParameter("operator"); // 연산자를 가져옴 calc가 가지고 있는 값을 가져온다 operator
int num1 = Integer.parseInt(request.getParameter("num1"));
int num2 = Integer.parseInt(request.getParameter("num2"));
if(op.equals("+")){
result = num1+num2;
}else if(op.equals("-")){
result = num1-num2;
}else if(op.equals("*")){
result = num1*num2;
}
if(op.equals("/")){
result = num1/num2;
}else if(num1 ==0){
result = 0;
}else if(num2 == 0){
result = 0;
}
}
%>
<!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=EUC-KR">
<title>Insert title here</title>
</head>
<body>
<form name=form2 method="POST" action="calc.jsp">
<h1>계산결과 : <%=result%></h1>
<input type="hidden" value=<%=result%> name="result">
<input type="submit" value="dd" name="B1">
</form>
</body>
</html>
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