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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230
Web アプリケーションの開発
5
ネストした JavaBeans の入力チェック
ネ ストした
JavaBeans
やコレクション内の
JavaBeans
に定義したプロパティに対して入力チェックを行ないた
い場合は、
@Valid
を指 定します 。
@Valid
はチェックル ールを表 現する制約 アノテーションではなく、チェック対
象を示すマーカーアノテーションです。
ネストしたJavaBeansをチェック対象にする際の指定例
@Valid
//
ネストした
JavaBeans
もチェック対象となる
private AccountForm account;
入力チェックルールの追加
実際のアプリケーション開発では、
Bean Validation
および
Hibernate Validator
が提供している制約アノテー
ションとは別に、独自の入力チェックルールの追加が必要になるケースがあります。
独自の入力チェックルールを追加する方法としては、「既成ルールを合成して作成する方法」と「独自のバリ
データを実装して作成する方法」の
2
つ が あります 。
■既成ルールを合成して作成する方法
「英数字チェック」のような複数の箇所で使用する汎用的な入力チェックルールについては、フォームオブ
ジェクトの各プロパティに
@Pattern
を指定するのではなく、
@Pattern
をメタアノテーションとして指定した独
自の制約アノテーションを作成するのがよいでしょう。
独自の制約アノテーションを作成することで、正規表現のパターン定義を
1
箇所に集約す ...
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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.