Spring 里定义Bean的名字

<!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");
    }
}