Wednesday, December 11, 2013

Spring MVCでThymeleafを使う

Thymeleafについて

ThymeleafはJSPに変わるような、主にHTML向けのテンプレートエンジン。JSPよりも高性能らしい。大きな特徴は、HTMLとしても妥当なマークアップでテンプレートを記述できること。同様のアプローチはSeasarファミリーにMayaaというのがあった。Mayaaはテンプレートのほかに、データとテンプレートのマッピング用のXMLを用意する必要があったのがイマイチだった。Thymeleafは普通にテンプレートファイルは一つで大丈夫。

ここではSTSのSpring MVCのテンプレートで作成したプロジェクトのテンプレートエンジンを、Thymeleafに変更する。

Mavenで依存を解決

pom.xmlのdependencyに以下を追加。

<dependency>
  <groupId>org.thymeleaf</groupId>
  <artifactId>thymeleaf</artifactId>
  <version>2.0.16</version>
</dependency>
<dependency>
  <groupId>org.thymeleaf</groupId>
  <artifactId>thymeleaf-spring3</artifactId>
  <version>2.0.16</version>
</dependency>
で、以下の(あるいは他の)コマンドを実行。
$ mvn install

Springの設定

Springの設定ファイルでテンプレートエンジンをJSPからThymeleafに変更。

<!-- 
<beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
  <beans:property name="prefix" value="/WEB-INF/views/" />
  <beans:property name="suffix" value=".jsp" />
</beans:bean>
-->

<beans:bean id="templateResolver" class="org.thymeleaf.templateresolver.ServletContextTemplateResolver">
  <beans:property name="prefix" value="/WEB-INF/views/" />
  <beans:property name="suffix" value=".html" />
  <beans:property name="characterEncoding" value="UTF-8" />
  <beans:property name="templateMode" value="HTML5" />
  <beans:property name="cacheable" value="false"/>
</beans:bean>
<beans:bean id="templateEngine" class="org.thymeleaf.spring3.SpringTemplateEngine">
  <beans:property name="templateResolver" ref="templateResolver" />
</beans:bean>
<beans:bean class="org.thymeleaf.spring3.view.ThymeleafViewResolver">
  <beans:property name="characterEncoding" value="UTF-8" />
  <beans:property name="templateEngine" ref="templateEngine" />
</beans:bean>   

注意点としては、開発用にテンプレートのキャッシュを無効にしてある(デフォルトでは有効)。プロダクションにでプロイするときにはこの設定を有効にするべきでしょう。<beans:property name="cacheable" value="false"/>という箇所。

テンプレートを記述

あとはWEB-INF/views以下にテンプレートをThymeleafの書式で書いていくだけ。Spring MVCのコントローラからの呼び出し方法についてはJSPと全く同様。 ただし、テンプレートのHTMLには以下のような宣言が必要。Thymeleaf単体で利用するのとは違い、thymeleafに'-spring3'というサフィックスがつくのに注意。

<!DOCTYPE html SYSTEM "http://www.thymeleaf.org/dtd/xhtml1-strict-thymeleaf-spring3-3.dtd">

<p th:utext="#{home.welcome}">Welcome to our grocery store!</p>

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