JSP/Servlet - 내장 객체

songmin jeon·2024년 1월 3일

클라우드기반 인공지능서비스 엔지니어링과정

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1. JSP 내장 객체

1.0. 내장 객체 확인해보기

다음 경로에서 내장객체 확인가능 !

아래 하늘색이 내장 객체임

1.1. 내장 객체 가능한 이유

1.2. 내장객체 실습

1. 성적 구하기

2. 메뉴정하는 프로그램 만들기

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body align  = "center">
   <form action="Ex03createlnput.jsp">
		<fieldset>
		   <legend>랜덤숫자입력</legend>
			   <input type="number" name="num">
			   <br>
			   <br>
			   <input type="submit" value="생성하기">
		</fieldset>
   </form>
</body>
</html>

<%@page import="java.util.Random"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<form action="Ex03randomWinner.jsp"> 
		<fieldset align ="center">
		   <legend>랜덤당첨 작성</legend>
			<%
				request.setCharacterEncoding("UTF-8");
				
				int num = Integer.parseInt(request.getParameter("num"));
				
				out.print("주제:<input type='text' name='title'><br>");
				
				for(int i = 1; i <= num; i++){
					out.print("아이템" + i + ":<input type='text' name='manu" + i + "'><br>");
				}
			%>
			<input type="hidden" name="num" value=<%= num %>>
			<input type="submit" value="시작">
		</fieldset>
   </form>
</body>
</html>

<%@page import="java.util.Random"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body align ="center">
	<%
		Random random = new Random();
		int num = Integer.parseInt(request.getParameter("num"));
		String manuTitle = null;
		String manu = null;
		
		while(true){
			int ranNum = random.nextInt(num+1);
			String what = "manu"+ranNum;
			manuTitle = request.getParameter("title");
			manu = request.getParameter(what);
			
			if(manu.equals(null)){
				continue;
			} else {
				break;
			}
		}
	%>
	
	<fieldset>
	   <legend>랜덤당첨결과</legend>
		   <p><%= manuTitle %></p>
		    <p><%= manu %></p>
	</fieldset>
</body>
</html>

2. Response 객체로 페이지 이동

2.1. html의 버튼을 누르면 네이버로 이동하기

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<form action="Ex04NaverPage.jsp">
		<input type="submit" value="네이버로 이동">
	</form>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<%
		// sendRedirect("요청 URL") 
		// : 웹 서버가 웹 브라우져(클라이언트)에게 이동할 url 주소를 알려줌
		
		response.sendRedirect("http://www.naver.com");
	%>
</body>
</html>

2.2. Response 객체로 페이지 이동 실습

1. 선택별 홈페이지 접속하기

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<form action="Ex05url.jsp">
		<select name="urlPage">
			<option value="naver">네이버</option>
			<option value="daum">다음</option>
			<option value="google">구글</option>
		</select>
		<input type="submit" value="제출">
	</form>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<%
		// sendRedirect("요청 URL") 
		// : 웹 서버가 웹 브라우져(클라이언트)에게 이동할 url 주소를 알려줌
		String url = request.getParameter("urlPage");
		
		if(url.equals("naver")){
			response.sendRedirect("http://www.naver.com");
		} else if (url.equals("daum")){
			response.sendRedirect("http://www.daum.net/");
		} else if (url.equals("google")){
			response.sendRedirect("http://www.google.com/");
		}
	%>
</body>
</html>

2. 로그인 프로그램

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body align  = "center">
   <form action="Ex06Login.jsp">
		<fieldset>
		   <legend>로그인</legend>
			   <input type="text" name="id">
			   <br>
			   <input type="password" name="pw">
			   <br>
			   <input type="submit" value="로그인">
		</fieldset>
   </form>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body align="center">
	<%
		String id = request.getParameter("id");
		String pw = request.getParameter("pw");
		
		if(id.equals("smart") && pw.equals("123")){
			response.sendRedirect("Ex06LoginSuccess.jsp");
		} else {
			response.sendRedirect("Ex06LoginFail.jsp");
		}
	%>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body align="center">
	<h3>Smart님 환영합니다!</h3>
	<a href="Ex06Login.html">로그아웃</a>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body align="center">
	<p>로그인정보를 다시 확인하세요.</p>
	<a href="Ex06Login.html">로그인페이지</a>
</body>
</html>