Java/Spring/IoC Bean Name

Bean Name Aliasing

/*
Pro Spring
By Rob Harrop
Jan Machacek
ISBN: 1-59059-461-4
Publisher: Apress
*/
///////////////////////////////////////////////////////////////////////////////
//File: beans.xml
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
   
    <!-- aliasing examples -->
    <bean id="name1" name="name2,name3,name4" class="java.lang.String"/>
    
</beans>

//////////////////////////////////////////////////////////////////////////////
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.FileSystemResource;
public class BeanNameAliasing {
    public static void main(String[] args) {
        BeanFactory factory = new XmlBeanFactory(new FileSystemResource("build/beans.xml"));
        
        String s1 = (String)factory.getBean("name1");
        String s2 = (String)factory.getBean("name2");
        String s3 = (String)factory.getBean("name3");
        String s4 = (String)factory.getBean("name4");
        
        System.out.println((s1 == s2));
        System.out.println((s2 == s3));
        System.out.println((s3 == s4));
        
        String[] x = factory.getAliases("name3");
        System.out.println("");
    }
}

Bean Name Example

/*
Pro Spring
By Rob Harrop
Jan Machacek
ISBN: 1-59059-461-4
Publisher: Apress
*/

/////////////////////////////////////////////////////////////////////////////////////
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
    <bean id="fooBean" class="AutoBean"/>
    <bean id="barBean" class="AutoBean"/>
    
</beans>

/////////////////////////////////////////////////////////////////////////////////////
public class AutoBean {
    public void foo() {
        System.out.println("foo()");
    }
}

/////////////////////////////////////////////////////////////////////////////////////
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
public class BeanNameExample {
    public static void main(String[] args) {
        ApplicationContext ctx = new FileSystemXmlApplicationContext(
        "build/bnapc.xml");
        
        AutoBean fooBean = (AutoBean)ctx.getBean("fooBean");
        AutoBean barBean = (AutoBean)ctx.getBean("barBean");
        
        fooBean.foo();
        barBean.foo();
    }
}

Define Bean Name

/*
Pro Spring
By Rob Harrop
Jan Machacek
ISBN: 1-59059-461-4
Publisher: Apress
*/
///////////////////////////////////////////////////////////////////////////////
File: beans.xml
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
    <!-- naming examples -->
    <bean id="string1" class="java.lang.String"/>
    <bean name="string2" class="java.lang.String"/>
    <bean class="java.lang.String"/>
    
</beans>

///////////////////////////////////////////////////////////////////////////////
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.FileSystemResource;
public class BeanNaming {
    public static void main(String[] args) {
        BeanFactory factory = new XmlBeanFactory(new FileSystemResource(
                "build/beans.xml"));
        
        String s1 = (String)factory.getBean("string1");
        String s2 = (String)factory.getBean("string2");
        String s3 = (String)factory.getBean("java.lang.String");
    }
}