spring笔记-BeanNameGenerator

1.内置BeanNameGenerator

BeanNameGenerator为BeanDefinition生成Bean名称

public interface BeanNameGenerator {

    /**
     * Generate a bean name for the given bean definition.
     * @param definition the bean definition to generate a name for
     * @param registry the bean definition registry that the given definition
     * is supposed to be registered with
     * @return the generated bean name
     */
    String generateBeanName(BeanDefinition definition, BeanDefinitionRegistry registry);

}

如下图

有2种策略,一种是是扫描xml()时,一种是在注解扫描时(@ComponentScan)

测试代码:

public class AnnotationBeanNameGeneratorTests {

    private BeanNameGenerator beanNameGenerator = new DefaultBeanNameGenerator();
    //private BeanNameGenerator beanNameGenerator = new AnnotationBeanNameGenerator();

    @Test
    public void generateBeanNameWithNamedComponent() {
        BeanDefinitionRegistry registry = new SimpleBeanDefinitionRegistry();
        AnnotatedBeanDefinition bd = new AnnotatedGenericBeanDefinition(ComponentWithName.class);
        String beanName = this.beanNameGenerator.generateBeanName(bd, registry);
        assertNotNull("The generated beanName must *never* be null.", beanName);
        assertTrue("The generated beanName must *never* be blank.", StringUtils.hasText(beanName));
        assertEquals("walden", beanName);
    }
}

2.自定义BeanNameGenerator

可以指定nameGenerator属性来自定义bean的命名生成规则

public @interface ComponentScan {
    Class nameGenerator() default BeanNameGenerator.class;
}

参考:

http://www.cnblogs.com/jason0529/p/5272265.html
http://www.cnblogs.com/jason0529/p/5274650.html
http://yunzhongxia.iteye.com/blog/898433