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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226
Web アプリケーションの開発
5
StringTrimmerEditorの適用例
@InitBinder
public void initBinder(WebDataBinder binder) {
binder.registerCustomEditor(
String.class, new StringTrimmerEditor(true));
❶
}
❶
コンストラクタ引数に
true
（空文字を
null
へ変換する）を指定して
StringTrimmerEditor
のインスタンスを作成
する 。作 成した
StringTrimmerEditor
のインスタンスを
WebDataBinder
に登録する
入力チェックルールの指定
入力チェックルールは、
Bean Validation
の制約アノテーションを使用して指定します。制約アノテーション
は 、次 の
3
つに分類することができます。
●
Bean Validation
標準の制約アノテーション
●
実装プロバイダ独自の制約アノテーション（本書では
Hibernate Validator
を使用）
●
独自の制約アノテーション
ここでは、
Bean Validation
標 準 の ア ノ テ ー ション（
javax.validation.constraints.*
）を中心に、実装プ
ロバイダの
1
つである
Hibernate Validator
が 提 供し て い る 代 表 的 なアノ テ ー ション（
org.hibernate.valida
tor.constraints.* ...
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