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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354
SpringMVC の応用
7
SessionStatus
の
setComplete
を呼び出したときの動作は、以下のとおりです。
●
@SessionAttributes
で指定した管理対象オブジェクトがすべて削除される
●
SessionStatus
の
setComplete
メソッドを呼び出したタイミングではオブジェクトは削除されず、セッショ
ンを扱う処理が完了したことをマークしているだけになっている。実際には
Controller
の
Handler
メソッド
の処理が終了した後に、フレームワークが
HTTP
セッションからオブジェクトを削除する
●
Handler
メソッドの終了後に
HTTP
セッションからオブジェクトが削除されるが、
View
とのデータ連携領
域（
Model
）の中には同じオブジェクトが残ってしまう。そのため、
setComplete
を呼び出した直後に遷移
した
View
からは、
Model
を介して
HTTP
セッションから削除したオブジェクトを参照できる。削除したオブ
ジ ェクトを
View
に表示させたくない場合は、リダイレクトをする必要がある。
■
View
からアクセスする方法
View
から
HTTP
セッションに格納したオブジェクトにアクセスする場合、
HTTP
セッションを使わないときと
同じ方法でアクセスすることができます。これは、
Model
に 格 納 し た オ ブ ジ ェ クト が「
request
（リクエ ストスコ ー
プ）」に格納される仕組みになっているためです。
View
として
JSP
を使う場合は、
EL
式で
${ ...
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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.