Spring里面定义Bean的别名Alias

<!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("");
    }
}