Struts2.x 集成 Guice 与 warp-persist 大概

首先，在工程web.xml里载入struts2  guice

 

<filter>

        <filter-name>guice</filter-name>

        <filter-class>com.google.inject.servlet.GuiceFilter</filter-class>

    </filter>

 

    <filter>

        <filter-name>struts2</filter-name>

        <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>

    </filter>

 

    <filter-mapping>

        <filter-name>guice</filter-name>

        <url-pattern>/*</url-pattern>

    </filter-mapping>

 

    <filter-mapping>

        <filter-name>struts2</filter-name>

        <url-pattern>*.do</url-pattern>

    </filter-mapping>

 

    <filter-mapping>

        <filter-name>struts2</filter-name>

        <url-pattern>*.jsp</url-pattern>

    </filter-mapping>

struts2的mapping有点怪吧，因为跟fckeditor冲突了，把/*的mapping改成这样了，不想让fileupload的request被struts2拦截封装（http://blog.csdn.net/klafzeng/archive/2009/03/07/3967171.aspx）

在struts.mxl中加入

  <constant name="struts.objectFactory" value="guice" />

  <constant name="struts.action.extension" value="do" />

  <constant name="guice.module" value="youcity.blog.module.YouCityModule"/>

也可以写入strtus.property中，与struts.xml同级目录

意思分别是：

使用guice

struts的访问后缀为*.do

指定guice的Module

youcity.blog.module目录：

public class YouCityModule implements Module {

public void configure(Binder binder) {

binder.install(new PersistModule());

}

}

public class PersistModule extends AbstractModule {

private final static Logger log = Logger.getLogger(PersistModule.class);

@Override

protected void configure() {

log.info("GsModule configure .....");

bindConstant().annotatedWith(JpaUnit.class).to("blogPersist");

install(PersistenceService.usingJpa().across(UnitOfWork.REQUEST)

.transactedWith(TransactionStrategy.LOCAL)

.forAll(Matchers.any())

.buildModule());

log.info("GsModule bind ..... ");

}

}

blogPersist持久化配置，存在于classes/META-INF/persistence.xml

<persistence-unit name="blogPersist" transaction-type="RESOURCE_LOCAL">

<provider>org.hibernate.ejb.HibernatePersistence</provider> 

<class>youcity_src.youcity.blog.model.SUser</class>

<class>youcity_src.youcity.blog.model.Article</class>

<class>youcity_src.youcity.blog.model.Comment</class>

<properties>

            <property name="hibernate.show_sql" value="true" />

            <property name="hibernate.format_sql" value="true" />

            <property name="hibernate.connection.driver_class" value="org.gjt.mm.mysql.Driver"/>

            <property name="hibernate.connection.url" value="jdbc:mysql://127.0.0.1:3306/blog?useUnicode=true&amp;characterEncoding=UTF-8"/>

             <property name="hibernate.connection.username" value="root"/>

            <property name="hibernate.connection.password" value="myDB"/>

            <property name="hibernate.connection.pool_size" value="100"/>

            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLMyISAMDialect"/>

            <property name="hibernate.connection.autocommit" value="false"/>

            <property name="hibernate.hbm2ddl.auto" value="update" />

        </properties>

</persistence-unit>

整合warp-persist

@ThreadSafe

public class SessionPerRequestInterceptor implements Interceptor {

    // not Serializable

    private transient Provider<EntityManagerFactory> emfProvider;

    

    @Inject

    public SessionPerRequestInterceptor(Provider<EntityManagerFactory> emfProvider) {

        // only use after the PersistenceService starts

       //注入JPA实体管理工厂

        this.emfProvider = emfProvider;

    }

    public String intercept(ActionInvocation ai) throws Exception {

        EntityManagerFactoryHolder.getCurrentEntityManager();      

        try {

            return ai.invoke();

        } finally {

            EntityManagerFactoryHolder.closeCurrentEntityManager();

        }

    }

    

    /**

     * @see com.opensymphony.xwork2.interceptor.Interceptor#init()

     */

    public void init() {}

    

    /**

     * @see com.opensymphony.xwork2.interceptor.Interceptor#destroy()

     */

    public void destroy() {

        if (emfProvider != null) {

            EntityManagerFactory emf = emfProvider.get();

            synchronized(emf) {

                if (emf.isOpen()) emf.close();

            }

        }

    }

    

    @Inject 

    public void start(PersistenceService service) {

        //注入warp-persist service并启动

        service.start();

    }

}

<interceptor name="sessionPerRequestInterceptor" class="com.wideplay.warp.jpa.SessionPerRequestInterceptor"/>

为什么做成拦截器？

该拦截器中的注入只运行一次，主要是：

<action name="list" class="youcity.blog.action.manage.ArticleAction" method="articleList">

<result>/manage/list.jsp</result>

<interceptor-ref name="sessionPerRequestInterceptor"/> 

</action>

配置到相应的操作中，每次调用intercept方法，关闭session提交数据（EntityManagerFactoryHolder.closeCurrentEntityManager();）