Jsf-spring-integration

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JSF-Springの統合

Springは、JSFとSpringをシームレスに統合する特別なクラスDelegatingVariableResolverを提供します。

JSFにSpring Dependency Injection（IOC）機能を統合するには、次の手順が必要です。

ステップ1：DelegatingVariableResolverを追加する

faces-config.xmlにvariable-resolverエントリを追加して、Springクラス DelegatingVariableResolver をポイントします。 

<faces-config>
   <application>
   <variable-resolver>
      org.springframework.web.jsf.DelegatingVariableResolver
   </variable-resolver>
   ...
</faces-config>

ステップ2：コンテキストリスナーを追加する

web.xmlのspringフレームワークによって提供される ContextLoaderListener および RequestContextListener リスナーを追加します。 

<web-app>
   ...
   <!-- Add Support for Spring -->
   <listener>
      <listener-class>
         org.springframework.web.context.ContextLoaderListener
      </listener-class>
   </listener>

   <listener>
      <listener-class>
         org.springframework.web.context.request.RequestContextListener
      </listener-class>
   </listener>
   ...
</web-app>

ステップ3：依存関係を定義する

管理対象Beanの依存関係として使用されるapplicationContext.xmlでBeanを定義します。 

<beans>
   <bean id = "messageService"
      class = "com.finddevguides.test.MessageServiceImpl">
      <property name = "message" value = "Hello World!"/>
   </bean>
</beans>

ステップ4：依存関係を追加する

*DelegatingVariableResolver* は、最初に値ルックアップをJSFのデフォルトリゾルバーに委任し、次にSpringのWebApplicationContextに委任します。 これにより、スプリングベースの依存関係をJSF管理のBeanに簡単に挿入できます。

ここでは、スプリングベースの依存関係としてmessageServiceを注入しました。 

<faces-config>
   ...
   <managed-bean>
      <managed-bean-name>userData</managed-bean-name>
      <managed-bean-class>com.finddevguides.test.UserData</managed-bean-class>
      <managed-bean-scope>request</managed-bean-scope>

      <managed-property>
         <property-name>messageService</property-name>
         <value>#{messageService}</value>
      </managed-property>
   </managed-bean>
</faces-config>

ステップ5：依存関係を使用する

//jsf managed bean
public class UserData {

  //spring managed dependency
   private MessageService messageService;

   public void setMessageService(MessageService messageService) {
      this.messageService = messageService;
   }

   public String getGreetingMessage() {
      return messageService.getGreetingMessage();
   }
}

応用例

テストJSFアプリケーションを作成して、スプリング統合をテストしましょう。

Step Description
1 Create a project with a name helloworld under a package com.finddevguides.test as explained in the JSF - First Application chapter.
2 Modify pom.xml as explained below.
3 Create faces-config.xml in WEB-INF folder as explained below.
4 Modify web.xml as explained below.
5 Create applicationContext.xml in WEB-INF folder as explained below.
6 Create MessageService.java under package com.finddevguides.test as explained below.
7 Create MessageServiceImpl.java under package com.finddevguides.test as explained below.
8 Create UserData.java under package com.finddevguides.test as explained below.
9 Modify home.xhtml as explained below. Keep the rest of the files unchanged.
10 Compile and run the application to make sure the business logic is working as per the requirements.
11 Finally, build the application in the form of war file and deploy it in Apache Tomcat Webserver.
12 Launch your web application using appropriate URL as explained below in the last step.

pom.xml

<project xmlns = "http://maven.apache.org/POM/4.0.0"
   xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation = "http://maven.apache.org/POM/4.0.0
   http://maven.apache.org/maven-v4_0_0.xsd">

   <modelVersion>4.0.0</modelVersion>
   <groupId>com.finddevguides.test</groupId>
   <artifactId>helloworld</artifactId>
   <packaging>war</packaging>
   <version>1.0-SNAPSHOT</version>
   <name>helloworld Maven Webapp</name>
   <url>http://maven.apache.org</url>

   <dependencies>
      <dependency>
         <groupId>junit</groupId>
         <artifactId>junit</artifactId>
         <version>3.8.1</version>
         <scope>test</scope>
      </dependency>

      <dependency>
         <groupId>com.sun.faces</groupId>
         <artifactId>jsf-api</artifactId>
         <version>2.1.7</version>
      </dependency>

      <dependency>
         <groupId>com.sun.faces</groupId>
         <artifactId>jsf-impl</artifactId>
         <version>2.1.7</version>
      </dependency>

      <dependency>
         <groupId>javax.servlet</groupId>
         <artifactId>jstl</artifactId>
         <version>1.2</version>
      </dependency>

      <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-core</artifactId>
         <version>3.1.2.RELEASE</version>
      </dependency>

      <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-web</artifactId>
         <version>3.1.2.RELEASE</version>
      </dependency>
   </dependencies>

   <build>
      <finalName>helloworld</finalName>
      <plugins>
         <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.3.1</version>
            <configuration>
               <source>1.6</source>
               <target>1.6</target>
            </configuration>
         </plugin>

         <plugin>
            <artifactId>maven-resources-plugin</artifactId>
            <version>2.6</version>

            <executions>
               <execution>
                  <id>copy-resources</id>
                  <phase>validate</phase>
                  <goals>
                     <goal>copy-resources</goal>
                  </goals>

                  <configuration>
                     <outputDirectory>${basedir}/target/helloworld/resources
                        </outputDirectory>
                     <resources>
                        <resource>
                           <directory>src/main/resources</directory>
                           <filtering>true</filtering>
                        </resource>
                     </resources>
                  </configuration>
               </execution>
            </executions>

         </plugin>
      </plugins>
   </build>
</project>

faces-config.xml

<?xml version = "1.0" encoding = "UTF-8"?>
<faces-config
   xmlns = "http://java.sun.com/xml/ns/javaee"
   xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation = "http://java.sun.com/xml/ns/javaee
   http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd"
   version = "2.0">

   <application>
      <variable-resolver>
         org.springframework.web.jsf.DelegatingVariableResolver
      </variable-resolver>
   </application>

   <managed-bean>
      <managed-bean-name>userData</managed-bean-name>
      <managed-bean-class>com.finddevguides.test.UserData</managed-bean-class>
      <managed-bean-scope>request</managed-bean-scope>
      <managed-property>
         <property-name>messageService</property-name>
         <value>#{messageService}</value>
      </managed-property>
   </managed-bean>
</faces-config>

web.xml

<!DOCTYPE web-app PUBLIC
   "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
   "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
   <display-name>Archetype Created Web Application</display-name>

   <context-param>
      <param-name>javax.faces.PROJECT_STAGE</param-name>
      <param-value>Development</param-value>
   </context-param>

   <!-- Add Support for Spring -->
   <listener>
      <listener-class>
         org.springframework.web.context.ContextLoaderListener
      </listener-class>
   </listener>

   <listener>
      <listener-class>
         org.springframework.web.context.request.RequestContextListener
      </listener-class>
   </listener>

   <servlet>
      <servlet-name>Faces Servlet</servlet-name>
      <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
   </servlet>

   <servlet-mapping>
      <servlet-name>Faces Servlet</servlet-name>
      <url-pattern>*.jsf</url-pattern>
   </servlet-mapping>
</web-app>

applicationContext.xml

<?xml version = "1.0" encoding = "UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"
   "http://www.springframework.org/dtd/spring-beans-2.0.dtd">

<beans>
   <bean id = "messageService"
      class = "com.finddevguides.test.MessageServiceImpl">
      <property name = "message" value = "Hello World!"/>
   </bean>
</beans>

MessageService.java

package com.finddevguides.test;

public interface MessageService {
   String getGreetingMessage();
}

MessageServiceImpl.java

package com.finddevguides.test;

public class MessageServiceImpl implements MessageService {
   private String message;

   public String getGreetingMessage() {
      return message;
   }

   public String getMessage() {
      return message;
   }
   public void setMessage(String message) {
      this.message = message;
   }
}

UserData.java

package com.finddevguides.test;

import java.io.Serializable;

public class UserData implements Serializable {

   private static final long serialVersionUID = 1L;
    private MessageService messageService;

   public MessageService getMessageService() {
      return messageService;
   }

   public void setMessageService(MessageService messageService) {
      this.messageService = messageService;
   }

   public String getGreetingMessage() {
      return messageService.getGreetingMessage();
   }
}

home.xhtml

<?xml version = "1.0" encoding = "UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns = "http://www.w3.org/1999/xhtml"
   xmlns:f = "http://java.sun.com/jsf/core"
   xmlns:h = "http://java.sun.com/jsf/html">

   <h:head>
      <title>JSF Tutorial!</title>
   </h:head>

   <h:body>
      <h2>Spring Integration Example</h2>
      #{userData.greetingMessage}
   </h:body>
</html>

すべての変更を完了したら、JSF-最初のアプリケーションの章で行ったようにアプリケーションをコンパイルして実行します。 すべてがアプリケーションで問題ない場合、次の結果が生成されます。

JSF Spring Result

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