서블릿

[서블릿] 서블릿 프로그래밍 : 계산기 구현

기록하는_사람 2022. 11. 15. 13:55

서블릿 프로그래밍 : 계산기 구현

📌 화면 구현

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Simple Calculator</title>
</head>
<body>
	<h2>계산기 서블릿</h2>
	<hr>
	<form method="post" action="/jspstudy/calc">
		<input type="text" name="n1" size="10"> <select name="op">
			<option selected>+</option>
			<option>-</option>
			<option>*</option>
			<option>/</option>
		</select> <input type="text" name="n2" size="10">
		<input type="submit" value="실행">
	</form>
</body>
</html>

📌 계산기 서블릿 구현

package ch05;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import java.lang.String;

@WebServlet("/calc")
public class CalcServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    public CalcServlet() {
        super();
    }

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		int n1 = Integer.parseInt(request.getParameter("n1"));
		int n2 = Integer.parseInt(request.getParameter("n2"));
		String op = request.getParameter("op");
		
		long result = 0;
		
		switch(request.getParameter("op")) {
		case "+":
			result = n1 + n2;
			break;
		case "-":
			result = n1 - n2;
			break;
		case "*":
			result = n1 * n2;
			break;
		case "/":
			result = n1 / n2;
			break;
		}
		
		response.setContentType("text/html; charset=utf-8");
		PrintWriter out = response.getWriter();
		out.append("<html><body><h2>계산기 서블릿</h2><hr>")
		.append("계산 결과 : " + result + "</body></html>");
	}

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

}

 

서블릿 프로그래밍 : 계산기 구현 - 결과물

📌 서블릿 프로그래밍 : 계산기 구현 - 결과물

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