为什么这个dao类不会自动装配？ [英] Why won't this dao class autowire?
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问题描述
请查看下面的文件并告诉我Dao为什么不会自动装配。当同一个setter放入控制器时，它会正确自动装配。我把它放在这个课程中它不起作用。
商务舱
< pre class =lang-java prettyprint-override>
@Component
public class AuthenticateUser {
@Autowired
private SecurityDAO securityDAO;
public void setSecurityDAO（SecurityDAO securityDAO）{
this.securityDAO = securityDAO;
}
protected void execute（）{
User authenticatedUser = securityDAO.login（get_userName（），
get_password（））;
}
}
application-context.xml
< beans xmlns =http://www.springframework.org/schema / beans
xmlns：mvc =http://www.springframework.org/schema/mvc
xmlns：xsi =http://www.w3.org/2001/XMLSchema-instance
xmlns：aop =http://www.springframework.org/schema/aop
xmlns：context =http://www.springframework.org/schema/context
xsi：schemaLocation =http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http： //www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/ schema / context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd\">
< bean id =myDataSource
class =org.apache.tomcat.dbcp.dbcp.BasicDataSource>
< property name =driverClassName>
< value> com.mysql.jdbc.Driver< / value>
< / property>
< property name =url>
< value> jdbc：mysql：// localhost / dbname< / value>
< / property>
< property name =username>
< value>联合国< / value>
< / property>
< property name =password>
< value> pw< / value>
< / property>
<！ - 禁用二级缓存 - >
<！ - 回显所有已执行的SQL到stdout - >
< / bean>
< bean id =sessionFactoryclass =org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean>
< property name =dataSourceref =myDataSource/>
< property name =annotatedClasses>
< list>
< value> com.projectname.model.SecurityInfo< / value>
< value> com.projectname.model.User< / value>
< value> com.projectname.model.Post< / value>
< value> com.projectname.model.Article< / value>
< value> com.projectname.model.Address< / value>
< / list>
< / property>
< property name =hibernateProperties>
< props>
< prop key =hibernate.dialect> org.hibernate.dialect.MySQLDialect< / prop>
< prop key =hibernate.show_sql> true< / prop>
< prop key =hibernate.show_sql> true< / prop>
< / props>
< / property>
< / bean>
< bean id =mySecurityInfoDAOclass =com.projectname.dao.SecurityDAOImpl>
< property name =sessionFactoryref =sessionFactory/>
< / bean>
< / beans>
spring-servlet.xml
<？xml version =1.0encoding =UTF-8？>
< beans xmlns =http://www.springframework.org/schema/beans
xmlns：mvc =http://www.springframework.org/schema/mvc
xmlns：xsi =http://www.w3.org/2001/XMLSchema-instance
xmlns：aop =http://www.springframework.org/schema/aop
xmlns ：context =http://www.springframework.org/schema/context
xsi：schemaLocation =http://www.springframework.org/schema/beans
http：// www。 springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/ spring-aop-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd\">
< context：annotation-config />
< context：component-scan
base-package =com.projectname/>
< bean id =viewResolver
class =org.springframework.web.servlet.view.UrlBasedViewResolver>
< property name =viewClass
value =org.springframework.web.servlet.view.JstlView/>
< property name =prefixvalue =/ WEB-INF / views //>
< property name =suffixvalue =。jsp/>
< / bean>
< bean id =messageSourceclass =org.springframework.context.support.ReloadableResourceBundleMessageSource>
< property name =basenames>
< value> / WEB-INF / messages / messages< / value>
< / property>
< property name =cacheSecondsvalue =60/>
< property name =defaultEncodingvalue =UTF-8/>
< / bean>
< / beans>
解决方案
让我猜： AuthenticatedUser 是域实体吗？
Spring只能处理Spring Beans，只能注入Spring Beans。 / p>
如果你有一个以Pojo方式实例化的类 new （或者由Hibernate /从数据库加载） JPA，...）它不会成为一个Spring Bean。
但你甚至可以让这个Pojos成为Spring Beans。你需要3件事：
- add @Configurable 到实体
- 打开Spring Configurable支持：
- 启用AspectJ（AspectJ不是Spring AOP） - 编译时或加载时编织。 - 如果你使用编译时编织你需要使用AspectJ编译器
@See：
- Spring参考：第7.8.1章使用AspectJ依赖于Spring弹出域对象
- 使用Spring的@Configurable分三个简单步骤
- Spring，Aspects，@可配置和编译时间使用maven编织
Please look at the files below and tell me why the Dao will not autowire. It autowires correctly when the same setter is put in a controller. I put it in this class and it does not work.
Business Class
@Component
public class AuthenticateUser {
@Autowired
private SecurityDAO securityDAO;
public void setSecurityDAO(SecurityDAO securityDAO) {
this.securityDAO = securityDAO;
}
protected void execute() {
User authenticatedUser = securityDAO.login(get_userName(),
get_password());
}
}
application-context.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
<bean id="myDataSource"
class="org.apache.tomcat.dbcp.dbcp.BasicDataSource">
<property name="driverClassName">
<value>com.mysql.jdbc.Driver</value>
</property>
<property name="url">
<value>jdbc:mysql://localhost/dbname</value>
</property>
<property name="username">
<value>un</value>
</property>
<property name="password">
<value>pw</value>
</property>
<!-- Disable the second-level cache -->
<!-- Echo all executed SQL to stdout -->
</bean>
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="myDataSource" />
<property name="annotatedClasses">
<list>
<value>com.projectname.model.SecurityInfo</value>
<value>com.projectname.model.User</value>
<value>com.projectname.model.Post</value>
<value>com.projectname.model.Article</value>
<value>com.projectname.model.Address</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
</bean>
<bean id="mySecurityInfoDAO" class="com.projectname.dao.SecurityDAOImpl">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
</beans>
spring-servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
<context:annotation-config />
<context:component-scan
base-package="com.projectname" />
<bean id="viewResolver"
class="org.springframework.web.servlet.view.UrlBasedViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/views/" />
<property name="suffix" value=".jsp" />
</bean>
<bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
<property name="basenames">
<value>/WEB-INF/messages/messages</value>
</property>
<property name="cacheSeconds" value="60" />
<property name="defaultEncoding" value="UTF-8" />
</bean>
</beans>
解决方案
Let my guess: AuthenticatedUser is a Domain Entity?
Spring can only handle Spring Beans, and can only inject in Spring Beans.
If you have a class that is instantiated in a Pojo way by new (or loaded form the database by Hibernate/JPA,...) it does not become a Spring Bean.
But you can make even this Pojos become Spring Beans. You need 3 things:
- add @Configurable to the Entity
- turn on Spring Configurable support:
- enable AspectJ (AspectJ not Spring AOP) - compiletime or loadtime weaving. -- If you use compiletime weaving you need to use an AspectJ Compiler
@See:
- Spring Reference: Chapter 7.8.1 Using AspectJ to dependency inject domain objects with Spring
- Using Spring’s @Configurable in three easy steps
- Spring, Aspects, @Configurable and Compile Time Weaving using maven
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