How to autowire a class which is in another projec

问题:

I have two java projects as epService and epEntity (factory classes for db access). And there is another Spring project as epWeb which contains controllers and this is a Rest API. Now, I want to autowire a class which is inside epEntity to the spring project epWeb. I have successfully autowired classes within that epWeb project but I was unable to autowire a class from another project Anyone have a suggestion for doing that, please let me know. If this is an irrelevant question for stackoverflow, please delete this.

The class where I autowire public class Mapper {

@Autowired
private SessionFactory sessionFactory;

public void setSessionFactory(SessionFactory sessionFactory) {
    this.sessionFactory = sessionFactory;
}
@Autowired
private AppointmentFactory af;
@Autowired
private AppointmentController ac;
}

mvc-dispatcher-servlet.xml

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans     
        http://www.springframework.org/schema/beans/spring-beans-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-3.2.xsd">

    <context:component-scan base-package="com.mobios.ep.web.controllers" />
    <!-- <context:component-scan base-package="com.mobios.ep.services" />
    <context:component-scan base-package="com.ombios.ep.entity.factory" /> -->
    <mvc:annotation-driven />
    <mvc:resources mapping="/resources/**" location="/resources/" />

    <bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"/>
        <property name="suffix" value=".jsp"/>      
    </bean> 
     <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
     <property name="maxUploadSize" value="1048576"/>
    </bean>
</beans>

回答1:

You can use @ComponentScan annotation in your main application epWeb in order to register in Spring context classes which live in epEntity project as Beans (Controllers, Services etc).

@ComponentScan({"com.example.service", "com.example.controlle‌​r"})

Also, make sure that Service implementations are annotated with @Service in epEntity project.

回答2:

My sugestion is to create an spring-config.xml file in both projects for own spring beans configurations (you used the name mvc-dispatcher-servlet.xml) and on web.xml to map both files for contextConfigLocation, so both projects will be in same spring context.

Also you can use a specified pattern for spring config files and to use a regex for contextConfigLocation.

web.xml fragment:

  <context-param>
    <param-name>contextConfigLocation</param-name>
      <param-value>
        classpath:view-spring-config.xml
        classpath:service-spring-config.xml
      </param-value>
  </context-param>

or

  <context-param>
    <param-name>contextConfigLocation</param-name>
      <param-value>
        classpath:*-spring-config.xml
      </param-value>
  </context-param>