[calculator.html]
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta charset="EUC-KR">
<title>계산기 실습</title>
</head>
<body>
<CENTER>
<h2>계산기</h2>
<hr width="100%">
<form name = "calculator" action="./result" method=post>
<input type="text" name = "num1" size=5>
<select name = "getOperator">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
<input type="text" name = "num2" size=5>
<input type="submit" value="계산" name = "resultbtn">
<input type="reset" value="다시입력" name = "resetbtn">
</form>
</CENTER>
</body>
</html>
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[JavaResources > Calc.java]
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import javax.servlet.*;
import java.util.Calendar;
public class CalcServlet extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException{
doPost(request,response); //post 방식으로 데이터 전송
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException{
int num1, num2;
int result;
String op;
//클라이언트 응답시 전달될 컨텐츠에 대한 기본 타입 설정
response.setContentType("text/html");
response.setCharacterEncoding("euc-kr");
//클라이언트 응답을 위한 출력 스트릠 확보
PrintWriter out = response.getWriter();
num1 = Integer.parseInt(request.getParameter("num1")); //num1로 되어 있는 값 int타입으로 가져와 저장
num2 = Integer.parseInt(request.getParameter("num2")); //num2로 되어 있는 값 int타입으로 가져와 저장
op = request.getParameter("getOperator"); //연산자 받아 저장
//result = calc(num1, num2, op); //메소드 호출
Calc calc = new Calc(num1, num2, op);
result = calc.getResult();
//html write
out.write("<HTML><HEAD><TITLE>ServletTest</TITLE></HEAD>");
out.write("<BODY><CENTER><H2>");
out.write("계산결과</H2>");
out.write("<hr width='100%'>");
out.write(num1+" "+op+" "+num2+" = "+result);
out.write("</CENTER></BODY></HTML>");
out.close();
}
private int calc(int num1, int num2, String op) {
int str=0;
switch (op) {
case "+":
str = num1+num2;
break;
case "-":
str = num1-num2;
break;
case "*":
str = num1*num2;
break;
case "/":
str = num1/num2;
break;
default:
break;
}
return str;
}
}
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[web.xml]
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<?xml version="1.0" encoding="UTF-8"?>
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
id="WebApp_ID" version="4.0">
<display-name>Calc</display-name>
<welcome-file-list>
</welcome-file-list>
<servlet>
<description></description>
<display-name>CalcServlet</display-name>
<servlet-name>CalcServlet</servlet-name>
<servlet-class>CalcServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>CalcServlet</servlet-name>
<url-pattern>/result</url-pattern>
</servlet-mapping>
</web-app>
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