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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7.1 HTTP セッションの利用
セッション属性（@SessionAttributes）
@org.springframework.web.bind.annotation.SessionAttributes
は、
1
つの
Controller
内で扱う複数の
リクエスト間でデータを共有する場合に有効な方法です。入力画面が複数のページで構成されるような場合や
複雑な画面遷移を伴う場合は、
@SessionAttributes
を使用してフォームオブジェクトをセッションで管理する
こ と を 検 討 し て み てくだ さ い（
図7.1）。フォームオブジェクトをセッションに格納することで、アプリケーション
の設計や実装がシンプルになることがあります。なお、入力画面、確認画面、完了画面がそれぞれ１ページで
構成されるシンプルな画面構成の場合は、
HTTP
セッションを使わずに
HTML
フォームの
hidden
要素を使用
してデータを持ち回る方法の採用も検討してみてください。
Controller
HttpSession
入力画面
（
1/3
）
入力画面
（
2/3
）
入力画面
（
3/3
）
確認画面 完了画面
オブ ジェクト
図
7.1
セッション属性（
@SessionAttributes
）の利用例
■管理対象オブジェクトの指定
@SessionAttributes
には、
HTTP
セッションで管理する対象オブジェクトを指定します。管理対象オブジェ
クトの指定方法として、 ...
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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.