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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223
5.7 入力チェック
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A
A
トパラメータは、
_roles
とい う 名 前 になります 。
リセット用のリクエストパラメータを送信すると以下のような動作になります。
1.
フォームオブジェクトのプロパティ値に
null
を設定する
2.
次に、フォームオブジェクトのプロパティ値にデータバインディング用のリクエストパラメータ値を設定する
したがって、データバインディング用のリクエストパラメータが送信されない場合には値がリセットされます。
Spring MVC が提供している JSP タグライブラリ（
<form:checkboxes>
要素や
<form:select>
要
素など）を使用してチェックボックスやセレクトボックスなどを作成すると、リセット用のパラメー
タが自動で送信される仕組みになっているため、上記の事象に対して特別な対処は不要です。非活
性や非表示状態に変更した項目に対してリセット用のリクエストパラメータを送信する必要がある
場合は、
<hidden>
要素を使用してリセット用のリクエストパラメータも送信するように実装してお
くとよいでしょう。
5.7
入力チェック
Spring MVC
は
Bean Validation
【22】
の仕組みを利用して、リクエストパラメータ値がバインドされたフォーム
クラス（またはコマンドクラス）に対して入力チェックを行ないます。
Bean Validation
を利用した 入 力 チェック
は
Spring 3.0 ...
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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.