๐Ÿ“† Today I Learned(๊ฐœ๋ฐœ์–ธ์–ดํ•™์Šต)/JSP

Day01(๋ณ„ ๊ทธ๋ฆฌ๊ธฐ, ํƒœ๊ทธ์ƒ์„ฑ, out.print(); )

JSP์—์„œ ๋ณ„ ๊ทธ๋ฆฌ๊ธฐ

<%@ 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>
<!-- -->
<%-- --%>

<!-- ๋ณ„๊ทธ๋ฆฌ๊ธฐ ul, liํƒœ๊ทธ ์‚ฌ์šฉ -->
<pre>
*
**
***
****
*****
</pre>
<%
	for(int i=1; i<=5; i++){
		for(int j=0; j<i; j++){
			out.print("*");
		}
		out.print("<br>");
	}
%>
<!--  -->
<ul>
	<li>1</li>
	<li>2</li>
	<li>3</li>	
	<li>4</li>
	<li>5</li>
	<li>6</li>
	<li>7</li>
	<li>8</li>
	<li>9</li>
	<li>10</li>
</ul>

<%
	out.print("<ul>");
	for(int j=1; j<=10; j++){
		out.print("<li>" + j + "</li>");
	}
	out.print("</ul>");
%>
	
<%
	String str = "";
	str +="<ul>";
	for(int i=0; i<10; i++){
		str+="<li>"+(i+1)+"</li>";
	}
	str+="</ul>";
	out.print(str);
	//String ๋ง๊ณ  StringBuffer๋ฅผ ์ด์šฉํ•ด์„œ
%>

<%
	StringBuffer sb = new StringBuffer();
	sb.append("<ul>");
	for(int i=0; i<10; i++){
		sb.append("<li>");
		sb.append(i+1);
		sb.append("</li>");
	}
	sb.append("</ul>");
	out.print(sb.toString());	
%>
<%= sb.toString() %>


</body>
</html>
  • ์ฃผ์„๋ฌธ ์‚ฌ์šฉ๋ฒ• <!-- --> : ctrl+shift+/
  • ํ™•์žฅ์ž๋Š” jsp์ด์ง€๋งŒ htmlํ™˜๊ฒฝ์ด๊ธฐ๋•Œ๋ฌธ์—? html์˜ ํƒœ๊ทธ๋ฅผ ๋ฐ”๋กœ ์‚ฌ์šฉํ•  ์ˆ˜ ๋„ ์žˆ๋‹ค. ๋˜ํ•œ <%%>๋ฅผ ์‚ฌ์šฉํ•˜๋ฉด ๊ทธ ์•ˆ์— ์ž๋ฐ”์ฝ”๋“œ๋ฅผ ์ž…๋ ฅํ•  ์ˆ˜ ์žˆ๊ธฐ๋•Œ๋ฌธ์— ์กฐ๊ฑด๋ฌธ,๋ฐ˜๋ณต๋ฌธ ๋“ฑ ๋‹ค์–‘ํ•˜๊ฒŒ ์‚ฌ์šฉ๊ฐ€๋Šฅํ•˜๋‹ค.
  • ์ž๋ฐ”์ฝ”๋“œ์•ˆ์—์„œ out.print(); ๋ฅผ ํ†ตํ•ด์„œ ๋ฌธ์„œ์— ์ž…๋ ฅ๋˜๋„๋ก ํ•  ์ˆ˜ ์žˆ๋‹ค. ํ•˜์ง€๋งŒ out.print๊ฐ™์€ ๊ฒฝ์šฐ์—๋Š” ์›ํ•˜๋Š” ๊ฒƒ์„ ์ถœ๋ ฅํ•  ๋•Œ๋งˆ๋‹ค ์ž‘์„ฑํ•ด์•ผํ•˜๋Š” ๋ถˆํŽธํ•จ์ด ์žˆ๊ธฐ๋•Œ๋ฌธ์— StringBuffer๋ฅผ ์‚ฌ์šฉํ•˜๋Š” ๊ฒƒ์ด ์ข€ ๋” ๋ฐ”๋žŒ์งํ•œ๋“ฏํ•˜๋‹ค.
  • ์œ„์˜ ์ฝ”๋“œ์˜ ๊ฒฝ์šฐ <%=sb.toString()%>์„ ํ†ตํ•ด ๋ฐ”๋กœ sb์— ๋‹ด๊ฒจ์žˆ๋Š” ๋ฌธ์ž์—ด์„ ์ถœ๋ ฅํ–ˆ๋‹ค.