Spring-MVC：创建良好的基础架构（配置）并避免重复
周滨海
问题内容：
问题答案：
从一段时间开始，我就在开发Spring-MVC应用程序。最近，我遇到了@Scheduled方法的一些问题，并且我注意到整个配置被加载了4次。因此，@
Scheduled方法被调用了4次。
这3种不正确的配置会因NullPointerException（我在SO上被告知）而消失，并且其中一种幸存。我非常想知道如何正确配置项目，因此只加载了一种配置，而不是4种，并在此过程中了解了Spring-
MVC。
由于servlet上下文很大，因此我将web.xml发布到pastebin上，因此我也可以放置Java代码。
Servlet-context.xml：
<context:annotation-config/>
<mvc:annotation-driven>
<mvc:argument-resolvers>
<beans:bean class="org.springframework.mobile.device.DeviceWebArgumentResolver"/>
</mvc:argument-resolvers>
</mvc:annotation-driven>
<mvc:interceptors>
<beans:bean class="org.springframework.mobile.device.DeviceResolverHandlerInterceptor"/>
</mvc:interceptors>
<mvc:default-servlet-handler/>
<resources mapping="/resources/" location="/resources/"/>
<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="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<beans:property name="driverClassName" value="org.postgresql.Driver"/>
<beans:property name="url"
value="jdbc:postgresql://localhost:5432/dbname"/>
<beans:property name="username" value="dbuser"/>
<beans:property name="password" value="dbpass"/>
<beans:property name="removeAbandoned" value="true"/>
<beans:property name="removeAbandonedTimeout" value="20"/>
<beans:property name="defaultAutoCommit" value="false"/>
</beans:bean>
<!-- Hibernate 4 SessionFactory Bean definition -->
<beans:bean id="hibernate4AnnotatedSessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<beans:property name="dataSource" ref="dataSource"/>
<beans:property name="annotatedClasses">
<beans:list>
<beans:value>com.journaldev.spring.model.Person</beans:value>
<beans:value>com.journaldev.spring.model.Notes</beans:value>
<beans:value>com.journaldev.spring.model.Canvas</beans:value>
<beans:value>com.journaldev.spring.model.Section</beans:value>
<beans:value>com.journaldev.spring.model.Attachment</beans:value>
<beans:value>com.journaldev.spring.model.GroupAccount</beans:value>
<beans:value>com.journaldev.spring.model.GroupMembers</beans:value>
<beans:value>com.journaldev.spring.model.GroupCanvas</beans:value>
<beans:value>com.journaldev.spring.model.GroupSection</beans:value>
<beans:value>com.journaldev.spring.model.GroupNotes</beans:value>
<beans:value>com.journaldev.spring.model.GroupAttachments
</beans:value>
<beans:value>com.journaldev.spring.model.Token</beans:value>
<beans:value>com.journaldev.spring.model.WaitingMembers
</beans:value>
<beans:value>com.journaldev.spring.model.NoteHistory</beans:value>
<beans:value>com.journaldev.spring.model.GroupNoteHistory
</beans:value>
<beans:value>com.journaldev.spring.model.Feedback</beans:value>
<beans:value>com.journaldev.spring.model.UnreadNotes</beans:value>
<beans:value>com.journaldev.spring.model.SessionState</beans:value>
<beans:value>com.journaldev.spring.model.FeatureRequest
</beans:value>
<beans:value>com.journaldev.spring.model.FeatureComment
</beans:value>
<beans:value>com.journaldev.spring.model.FeatureLike</beans:value>
<beans:value>com.journaldev.spring.model.OnlineUsers</beans:value>
<beans:value>com.journaldev.spring.model.NoteCount</beans:value>
<beans:value>com.journaldev.spring.model.NoteLock</beans:value>
<beans:value>com.journaldev.spring.model.ChatMessages</beans:value>
<beans:value>com.journaldev.spring.model.Conversation</beans:value>
<beans:value>com.journaldev.spring.model.Replies</beans:value>
<beans:value>com.journaldev.spring.model.Notification</beans:value>
<beans:value>com.journaldev.spring.model.Statistics</beans:value>
<beans:value>com.journaldev.spring.model.PrivateChannel</beans:value>
<beans:value>com.journaldev.spring.model.GroupChannels</beans:value>
</beans:list>
</beans:property>
<beans:property name="hibernateProperties">
<beans:props>
<beans:prop key="hibernate.dialect">org.hibernate.dialect.PostgreSQL9Dialect
</beans:prop>
<beans:prop key="hibernate.show_sql">false</beans:prop>
<beans:prop key="connection.pool_size">200</beans:prop>
<beans:prop key="c3p0.max_size">200</beans:prop>
<beans:prop key="c3p0.timeout">1000</beans:prop>
<!-- <beans:prop key="hibernate.jdbc.batch_size">1000</beans:prop>
<beans:prop key="hibernate.order_updates">true</beans:prop>-->
<beans:prop key="hibernate.hbm2ddl.auto">update</beans:prop>
</beans:props>
</beans:property>
</beans:bean>
<task:annotation-driven/>
<tx:annotation-driven transaction-manager="transactionManager"/>
<beans:bean id="transactionManager"
class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<beans:property name="sessionFactory" ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<!-- Person beans being here -->
<beans:bean id="personDAO" class="com.journaldev.spring.dao.PersonDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="personService"
class="com.journaldev.spring.service.PersonServiceImpl">
<beans:property name="personDAO" ref="personDAO"/>
</beans:bean>
<!-- <beans:bean id="bayeux" class="org.cometd.server.BayeuxServerImpl" init-method="start" destroy-method="stop">
<beans:property name="transports">
<beans:list>
<beans:bean id="jsonTransport" class="org.cometd.server.transport.JSONTransport">
<beans:constructor-arg ref="bayeux"/>
</beans:bean>
<beans:bean id="jsonpTransport" class="org.cometd.server.transport.JSONPTransport">
<beans:constructor-arg ref="bayeux"/>
</beans:bean>
</beans:list>
</beans:property>
</beans:bean>-->
<!-- Group Account beans begin here -->
<beans:bean id="groupAccountDAO"
class="com.journaldev.spring.dao.GroupAccountDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="groupAccountService"
class="com.journaldev.spring.service.GroupAccountServiceImpl">
<beans:property name="groupAccountDAO" ref="groupAccountDAO"/>
</beans:bean>
<!--Group Members bean begin here -->
<beans:bean id="groupMembersDAO"
class="com.journaldev.spring.dao.GroupMembersDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="groupMembersService"
class="com.journaldev.spring.service.GroupMembersServiceImpl">
<beans:property name="groupMembersDAO" ref="groupMembersDAO"/>
</beans:bean>
<!-- Notes bean begin here -->
<beans:bean id="notesDAO" class="com.journaldev.spring.dao.NotesDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="notesService"
class="com.journaldev.spring.service.NotesServiceImpl">
<beans:property name="notesDAO" ref="notesDAO"/>
</beans:bean>
<!--GroupNotes begin here -->
<beans:bean id="groupNotesDAO" class="com.journaldev.spring.dao.GroupNotesDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="groupNotesService"
class="com.journaldev.spring.service.GroupNotesServiceImpl">
<beans:property name="groupNotesDAO" ref="groupNotesDAO"/>
</beans:bean>
<!-- Canvas Beans begin here -->
<beans:bean id="canvasDAO" class="com.journaldev.spring.dao.CanvasDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="canvasService"
class="com.journaldev.spring.service.CanvasServiceImpl">
<beans:property name="canvasDAO" ref="canvasDAO"/>
</beans:bean>
<!--Group Canvas beans begin here -->
<beans:bean id="groupCanvasDAO"
class="com.journaldev.spring.dao.GroupCanvasDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="groupCanvasService"
class="com.journaldev.spring.service.GroupCanvasServiceImpl">
<beans:property name="groupCanvasDAO" ref="groupCanvasDAO"/>
</beans:bean>
<!-- Section beans begin here -->
<beans:bean id="sectionDAO" class="com.journaldev.spring.dao.SectionDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="sectionService"
class="com.journaldev.spring.service.SectionServiceImpl">
<beans:property name="sectionDAO" ref="sectionDAO"/>
</beans:bean>
<!-- Group Section beans begin here -->
<beans:bean id="groupSectionDAO"
class="com.journaldev.spring.dao.GroupSectionDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="groupSectionService"
class="com.journaldev.spring.service.GroupSectionServiceImpl">
<beans:property name="groupSectionDAO" ref="groupSectionDAO"/>
</beans:bean>
<beans:bean id="tokenDAO" class="com.journaldev.spring.dao.TokenDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="tokenService"
class="com.journaldev.spring.service.TokenServiceImpl">
<beans:property name="tokenDAO" ref="tokenDAO"/>
</beans:bean>
<beans:bean id="attachDAO" class="com.journaldev.spring.dao.AttachmentDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="attachService"
class="com.journaldev.spring.service.AttachmentServiceImpl">
<beans:property name="attachmentDAO" ref="attachDAO"/>
</beans:bean>
<beans:bean id="mattachDAO"
class="com.journaldev.spring.dao.GroupAttachmentsDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="mattachService"
class="com.journaldev.spring.service.GroupAttachmentsServiceImpl">
<beans:property name="groupAttachmentsDAO" ref="mattachDAO"/>
</beans:bean>
<beans:bean id="waitingDAO"
class="com.journaldev.spring.dao.WaitingMembersDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="waitingService"
class="com.journaldev.spring.service.WaitingMembersServiceImpl">
<beans:property name="waitingMembersDAO" ref="waitingDAO"/>
</beans:bean>
<beans:bean id="historyDAO"
class="com.journaldev.spring.dao.NoteHistoryDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="historyService"
class="com.journaldev.spring.service.NoteHistoryServiceImpl">
<beans:property name="noteHistoryDAO" ref="historyDAO"/>
</beans:bean>
<beans:bean id="mhistoryDAO"
class="com.journaldev.spring.dao.GroupNoteHistoryDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="mhistoryService"
class="com.journaldev.spring.service.GroupNoteHistoryServiceImpl">
<beans:property name="groupNoteHistoryDAO" ref="mhistoryDAO"/>
</beans:bean>
<beans:bean id="feedbackDAO" class="com.journaldev.spring.dao.FeedbackDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="feedbackService"
class="com.journaldev.spring.service.FeedbackServiceImpl">
<beans:property name="feedbackDAO" ref="feedbackDAO"/>
</beans:bean>
<beans:bean id="unreadDAO"
class="com.journaldev.spring.dao.UnreadNotesDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="unreadService"
class="com.journaldev.spring.service.UnreadNotesServiceImpl">
<beans:property name="unreadNotesDAO" ref="unreadDAO"/>
</beans:bean>
<beans:bean id="sessionStateDAO"
class="com.journaldev.spring.dao.SessionStateDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="sessionService"
class="com.journaldev.spring.service.SessionStateServiceImpl">
<beans:property name="sessionStateDAO" ref="sessionStateDAO"/>
</beans:bean>
<beans:bean id="featuresDAO"
class="com.journaldev.spring.dao.FeatureRequestDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="featuresService"
class="com.journaldev.spring.service.FeatureRequestServiceImpl">
<beans:property name="featureRequestDAO" ref="featuresDAO"/>
</beans:bean>
<beans:bean id="featureCommentDAO"
class="com.journaldev.spring.dao.FeatureCommentDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="featureCommentService"
class="com.journaldev.spring.service.FeatureCommentServiceImpl">
<beans:property name="featureCommentDAO" ref="featureCommentDAO"/>
</beans:bean>
<beans:bean id="featureLikeDAO"
class="com.journaldev.spring.dao.FeatureLikeDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="featureLikeService"
class="com.journaldev.spring.service.FeatureLikeServiceImpl">
<beans:property name="featureLikeDAO" ref="featureLikeDAO"/>
</beans:bean>
<beans:bean id="onlineUsersDAO"
class="com.journaldev.spring.dao.OnlineUsersDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="onlineUsersService"
class="com.journaldev.spring.service.OnlineUsersServiceImpl">
<beans:property name="onlineUsersDAO" ref="onlineUsersDAO"/>
</beans:bean>
<beans:bean id="noteCountDAO" class="com.journaldev.spring.dao.NoteCountDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="noteCountService"
class="com.journaldev.spring.service.NoteCountServiceImpl">
<beans:property name="noteCountDAO" ref="noteCountDAO"/>
</beans:bean>
<beans:bean id="noteLockDAO" class="com.journaldev.spring.dao.NoteLockDAOImpl">
<beans:property name="sessionFactory"
ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="noteLockService"
class="com.journaldev.spring.service.NoteLockServiceImpl">
<beans:property name="noteLockDAO" ref="noteLockDAO"/>
</beans:bean>
<beans:bean id="chatDAO" class="com.journaldev.spring.dao.ChatMessagesDAOImpl">
<beans:property name="sessionFactory" ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="chatService" class="com.journaldev.spring.service.ChatMessagesServiceImpl">
<beans:property name="chatDAO" ref="chatDAO"/>
</beans:bean>
<beans:bean id="conversationDAO" class="com.journaldev.spring.dao.ConversationDAOImpl">
<beans:property name="sessionFactory" ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="conversationService" class="com.journaldev.spring.service.ConversationServiceImpl">
<beans:property name="conversationDAO" ref="conversationDAO"/>
</beans:bean>
<beans:bean id="repliesDAO" class="com.journaldev.spring.dao.RepliesDAOImpl">
<beans:property name="sessionFactory" ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="repliesService" class="com.journaldev.spring.service.RepliesServiceImpl">
<beans:property name="repliesDAO" ref="repliesDAO"/>
</beans:bean>
<beans:bean id="notificationDAO" class="com.journaldev.spring.dao.NotificationDAOImpl">
<beans:property name="sessionFactory" ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="notificationService" class="com.journaldev.spring.service.NotificationServiceImpl">
<beans:property name="notificationDAO" ref="notificationDAO"/>
</beans:bean>
<beans:bean id="statisticsDAO" class="com.journaldev.spring.dao.StatisticsDAOImpl">
<beans:property name="sessionFactory" ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="statisticsService" class="com.journaldev.spring.service.StatisticsServiceImpl">
<beans:property name="statisticsDAO" ref="statisticsDAO"/>
</beans:bean>
<beans:bean id="privateChannelDAO" class="com.journaldev.spring.dao.PrivateChannelDAOImpl">
<beans:property name="sessionFactory" ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="privateChannelService" class="com.journaldev.spring.service.PrivateChannelServiceImpl">
<beans:property name="privateChannelDAO" ref="privateChannelDAO"/>
</beans:bean>
<beans:bean id="groupChannelsDAO" class="com.journaldev.spring.dao.GroupChannelsDAOImpl">
<beans:property name="sessionFactory" ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<beans:bean id="groupChannelsService" class="com.journaldev.spring.service.GroupChannelsServiceImpl">
<beans:property name="groupChannelsDAO" ref="groupChannelsDAO"/>
</beans:bean>
<!--<beans:bean id="chatBean" class="com.journaldev.spring.chat.ChatServiceImpl"/>-->
<!--Login bean -->
<beans:bean id="LoginServiceImpl"
class="com.journaldev.spring.service.LoginServiceImpl"/>
<context:component-scan base-package="com.journaldev.spring"/>
<!-- locale -->
<beans:bean id="messageSource"
class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
<beans:property name="basename" value="classpath:/locale/messages"/>
<beans:property name="defaultEncoding" value="UTF-8"/>
</beans:bean>
<context:property-placeholder location="classpath:application.properties"/>
<!-- default locale -->
<beans:bean id="localeResolver"
class="org.springframework.web.servlet.i18n.SessionLocaleResolver">
<beans:property name="defaultLocale" value="de"/>
</beans:bean>
<!-- Change locale via url. -->
<beans:bean id="localeChangeInterceptor"
class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor">
<beans:property name="paramName" value="lang"/>
</beans:bean>
<beans:bean id="handlerMapping"
class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping">
<beans:property name="interceptors">
<beans:list>
<beans:ref bean="localeChangeInterceptor"/>
</beans:list>
</beans:property>
</beans:bean>
<beans:bean class="com.journaldev.spring.service.DoNotTruncateMyUrls"/>
<beans:bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<beans:property name="maxUploadSize" value="52428800"/>
</beans:bean>
<beans:bean
class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
<beans:property name="messageConverters" ref="jsonMessageConverter"/>
</beans:bean>
<beans:bean id="jsonMessageConverter"
class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>
</beans:beans>
如前所述，这是web.xml的URL，这是security-
application.context.xml
在整个项目中，模型如下所示：
@Entity
@Table(name = "canvas")
public class Canvas {
@Id
@Column(name="canvasid")
@GeneratedValue(strategy = GenerationType.SEQUENCE,generator = "canvas_gen")
@SequenceGenerator(name = "canvas_gen",sequenceName = "canvas_seq")
@Index(name = "canvasid")
private int canvasid;
//Other variables, mappings, getters, setters
}
DAO在整个项目中看起来像这样：
@Transactional
@Repository
public class CanvasDAOImpl implements CanvasDAO{
private SessionFactory sessionFactory;
public void setSessionFactory(SessionFactory sf){
this.sessionFactory = sf;
}
private Session session;
public void setSession(Session session){this.session = session;}
@overrride
public returnType methodName(params..){
session = this.sessionFactory.getCurrentSession();
}
}
最后，我的服务层如下所示：
@Service
@Transactional
public class CanvasServiceImpl implements CanvasService {
private CanvasDAO canvasDAO;
public void setCanvasDAO(CanvasDAO canvasDAO) {
this.canvasDAO = canvasDAO;
}
//methods
}
我在整个Java文件中都保持了相同的结构。为什么我的配置加载了4次而不是1次。总体上有关于优化的建议。谢谢。
编辑
我的服务如下所示：
@Service
@Transactional
public class AttachmentServiceImpl implements AttachmentService{
@Autowired
private AttachmentDAO attachmentDAO;
// The guy below stays or not? why?
public void setAttachmentDAO(AttachmentDAO attachmentDAO){
this.attachmentDAO = attachmentDAO;
}
}
问题答案：
您的代码和配置可以改善很多方面。让我们从您的dao开始，不要将Sessionin
存储在实例变量中，我强烈建议对所需的依赖项使用构造函数注入。考虑到这一点，您的dao应该看起来像这样。
@Transactional
@Repository
public class CanvasDAOImpl implements CanvasDAO{
private final SessionFactory sessionFactory;
@Autowired
public CanvasDAOImpl(SessionFactory sessionFactory) {
this.sessionFactory=sessionFactory;
}
@overrride
public returnType methodName(params..){
Session session = this.sessionFactory.getCurrentSession();
// Do stuff with the session.
}
}
No more setters (especially not for the Session!) just a plain class. The
same applies for the @Service classes.
@Service
@Transactional
public class CanvasServiceImpl implements CanvasService {
private final CanvasDAO canvasDAO;
public CanvasServiceImpl(CanvasDAO canvasDAO) {
this.canvasDAO=canvasDAO;
}
//methods
}
In your configuration you have explicitly defined all your @Repository and
@Service beans. You also have a <context:component-scan /> which already
detects all @Components. Remove all explicitly declared @Repository and
@Service beans. This will really clean up your configuration!.
In your hibernate configuration the c3p0 and connection properties are
useless as you are injecting a DataSource and hibernate is’t managing it but
Spring is. Remove those lines. Also to cleanup this configuration further
instead of specifying each and every class it needs to proces add
packagesToScan so it will automatically detect @Entity annotated beans.
<context:annotation-config /> is already implied by the use of
<context:component-scan /> so you can remove it as it basically duplicates
things.
You have explicitly defined a RequestMappingHandlerMapping which doesn’t do
anything as there is already one registered by <mvc:annotation-driven />. It
only takes up memory, the MappingJackson2HttpMessageConverter is registered
automatically of Jackson2 is detected on the class path so no need to do that.
Chancing the Locale doesn’t work for all URLs as you forgot to register the
interceptor with the <mvc:annotation-driven /> element.
When applying all that advice to your classes and configuration the remaining
configuration looks like this.
<context:component-scan base-package="com.journaldev.spring"/>
<context:property-placeholder location="classpath:application.properties"/>
<mvc:annotation-driven>
<mvc:argument-resolvers>
<beans:bean class="org.springframework.mobile.device.DeviceWebArgumentResolver"/>
</mvc:argument-resolvers>
</mvc:annotation-driven>
<mvc:interceptors>
<beans:bean class="org.springframework.mobile.device.DeviceResolverHandlerInterceptor"/>
<beans:ref bean="localeChangeInterceptor" />
</mvc:interceptors>
<mvc:default-servlet-handler/>
<resources mapping="/resources/" location="/resources/"/>
<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="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<beans:property name="driverClassName" value="org.postgresql.Driver"/>
<beans:property name="url"
value="jdbc:postgresql://localhost:5432/dbname"/>
<beans:property name="username" value="dbuser"/>
<beans:property name="password" value="dbpass"/>
<beans:property name="removeAbandoned" value="true"/>
<beans:property name="removeAbandonedTimeout" value="20"/>
<beans:property name="defaultAutoCommit" value="false"/>
</beans:bean>
<!-- Hibernate 4 SessionFactory Bean definition -->
<beans:bean id="hibernate4AnnotatedSessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<beans:property name="dataSource" ref="dataSource"/>
<beans:property name="packagesToScan" value="com.journaldev.spring.model" />
</beans:property>
<beans:property name="hibernateProperties">
<beans:props>
<beans:prop key="hibernate.dialect">org.hibernate.dialect.PostgreSQL9Dialect</beans:prop>
<beans:prop key="hibernate.show_sql">false</beans:prop>
<!-- <beans:prop key="hibernate.jdbc.batch_size">1000</beans:prop>
<beans:prop key="hibernate.order_updates">true</beans:prop>-->
<beans:prop key="hibernate.hbm2ddl.auto">update</beans:prop>
</beans:props>
</beans:property>
</beans:bean>
<task:annotation-driven/>
<tx:annotation-driven transaction-manager="transactionManager"/>
<beans:bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<beans:property name="sessionFactory" ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<!-- <beans:bean id="bayeux" class="org.cometd.server.BayeuxServerImpl" init-method="start" destroy-method="stop">
<beans:property name="transports">
<beans:list>
<beans:bean id="jsonTransport" class="org.cometd.server.transport.JSONTransport">
<beans:constructor-arg ref="bayeux"/>
</beans:bean>
<beans:bean id="jsonpTransport" class="org.cometd.server.transport.JSONPTransport">
<beans:constructor-arg ref="bayeux"/>
</beans:bean>
</beans:list>
</beans:property>
</beans:bean>-->
<!-- locale -->
<beans:bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
<beans:property name="basename" value="classpath:/locale/messages"/>
<beans:property name="defaultEncoding" value="UTF-8"/>
</beans:bean>
<!-- default locale -->
<beans:bean id="localeResolver" class="org.springframework.web.servlet.i18n.SessionLocaleResolver">
<beans:property name="defaultLocale" value="de"/>
</beans:bean>
<!-- Change locale via url. -->
<beans:bean id="localeChangeInterceptor" class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor">
<beans:property name="paramName" value="lang"/>
</beans:bean>
<beans:bean id="handlerMapping" class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping">
<beans:property name="interceptors">
<beans:list>
<beans:ref bean="localeChangeInterceptor"/>
</beans:list>
</beans:property>
</beans:bean>
<beans:bean class="com.journaldev.spring.service.DoNotTruncateMyUrls"/>
<beans:bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<beans:property name="maxUploadSize" value="52428800"/>
</beans:bean>
</beans:beans>
However you really should split things up in what is loaded by the
ContextLoaderListener basically everything BUT @Controllers and what is
loaded by the DispatcherServlet just @Controllers and web related beans.
So the servlet-context.xml should look something like this.
<context:component-scan base-package="com.journaldev.spring" use-default-filters="false">
<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller" />
</context:component-scan>
<context:property-placeholder location="classpath:application.properties"/>
<mvc:annotation-driven>
<mvc:argument-resolvers>
<beans:bean class="org.springframework.mobile.device.DeviceWebArgumentResolver"/>
</mvc:argument-resolvers>
</mvc:annotation-driven>
<mvc:interceptors>
<beans:bean class="org.springframework.mobile.device.DeviceResolverHandlerInterceptor"/>
<beans:ref bean="localeChangeInterceptor" />
</mvc:interceptors>
<mvc:default-servlet-handler/>
<resources mapping="/resources/" location="/resources/"/>
<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>
<!-- locale -->
<beans:bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
<beans:property name="basename" value="classpath:/locale/messages"/>
<beans:property name="defaultEncoding" value="UTF-8"/>
</beans:bean>
<!-- default locale -->
<beans:bean id="localeResolver" class="org.springframework.web.servlet.i18n.SessionLocaleResolver">
<beans:property name="defaultLocale" value="de"/>
</beans:bean>
<!-- Change locale via url. -->
<beans:bean id="localeChangeInterceptor" class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor">
<beans:property name="paramName" value="lang"/>
</beans:bean>
<beans:bean id="handlerMapping" class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping">
<beans:property name="interceptors">
<beans:list>
<beans:ref bean="localeChangeInterceptor"/>
</beans:list>
</beans:property>
</beans:bean>
<beans:bean class="com.journaldev.spring.service.DoNotTruncateMyUrls"/>
<beans:bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<beans:property name="maxUploadSize" value="52428800"/>
</beans:bean>
Then add what was removed and a <context:component-scan /> (or modify it) to
the root-context.xml.
<context:component-scan base-package="com.journaldev.spring">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" />
</context:component-scan>
<context:property-placeholder location="classpath:application.properties"/>
<beans:bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<beans:property name="driverClassName" value="org.postgresql.Driver"/>
<beans:property name="url"
value="jdbc:postgresql://localhost:5432/dbname"/>
<beans:property name="username" value="dbuser"/>
<beans:property name="password" value="dbpass"/>
<beans:property name="removeAbandoned" value="true"/>
<beans:property name="removeAbandonedTimeout" value="20"/>
<beans:property name="defaultAutoCommit" value="false"/>
</beans:bean>
<!-- Hibernate 4 SessionFactory Bean definition -->
<beans:bean id="hibernate4AnnotatedSessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<beans:property name="dataSource" ref="dataSource"/>
<beans:property name="packagesToScan" value="com.journaldev.spring.model" />
</beans:property>
<beans:property name="hibernateProperties">
<beans:props>
<beans:prop key="hibernate.dialect">org.hibernate.dialect.PostgreSQL9Dialect</beans:prop>
<beans:prop key="hibernate.show_sql">false</beans:prop>
<!-- <beans:prop key="hibernate.jdbc.batch_size">1000</beans:prop>
<beans:prop key="hibernate.order_updates">true</beans:prop>-->
<beans:prop key="hibernate.hbm2ddl.auto">update</beans:prop>
</beans:props>
</beans:property>
</beans:bean>
<task:annotation-driven/>
<tx:annotation-driven transaction-manager="transactionManager"/>
<beans:bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<beans:property name="sessionFactory" ref="hibernate4AnnotatedSessionFactory"/>
</beans:bean>
<!-- <beans:bean id="bayeux" class="org.cometd.server.BayeuxServerImpl" init-method="start" destroy-method="stop">
<beans:property name="transports">
<beans:list>
<beans:bean id="jsonTransport" class="org.cometd.server.transport.JSONTransport">
<beans:constructor-arg ref="bayeux"/>
</beans:bean>
<beans:bean id="jsonpTransport" class="org.cometd.server.transport.JSONPTransport">
<beans:constructor-arg ref="bayeux"/>
</beans:bean>
</beans:list>
</beans:property>
</beans:bean>-->
Remove the <import resource="servlet-context.xml" /> from your security- context.xml.
Finally let the DispatcherServlet load the servlet-context.xml instead of
the security-context.xml.
Now as you aren’t loading beans twice per context anymore you should have a
reduced memory footprint and you shouldn’t have 4 scheduled jobs any more.
Also your Email class should, ideally, also be a Spring managed bean and I
would suggest using the JavaMailSender API which simplifies sending emails.
So basically the task ahead for you is to mainly remove things, you will end
up with less code and less configuration and still achieve the same.
For more hands-on-advice I’m for hire ;)…
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