May 2024
Intermediate to advanced
752 pages
24h
Japanese
Content preview from Spring徹底入門 第2版 Spring FrameworkによるJavaアプリケーション開発
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257
5.10 JSP の実装
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<c:out value="${token}" />
<br>
</c:forEach>
タグファイルの利用例
<%@ taglib prefix="myTags" tagdir="/WEB-INF/tags" %>
<myTags:printTokens tokensString="
スポーツ
,
映画
,
音楽
" />
タグファイルを使 用すると、
View
に関するロジックを簡単に共通化することができるため、共通的に使用す
る
UI
部品（ページネーションリンクやカレンダーなど）を作成する際に使用するとよいでしょう。
EL（Expression Language）
JSP
では、
EL
【30】
と呼ばれる式言語を使用して値の参照、出力、演算を行なうことができます。
EL
式は、
${...}
（または
#{...}
）という形式で記述します。
たとえば、
HttpServletRequest
に
"message"
という属性名で
"こんにちは！"
という文字列が格納されてい
たとしましょう 。この 文 字 列を
EL
式を使って画面に表示する場合は、以下のような実装になります。
EL 式を使用したJSPの実装例
<span id="message">${message}
</span>
EL
式は
XML
特殊文字に対するエスケープ処理は行なわないため、上記の実装だとクロスサイトスクリプティ
ングが発生する可能性があります。
XML
特殊文字が含 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.