自定义个Bean名称生成策略, 解决不同包下同名类问题/AnnotationBeanNameGenerator

一.写一个类继承AnnotationBeanNameGenerator类

import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.context.annotation.AnnotationBeanNameGenerator;

/**
 * 自定义个BeanName生成策略, 解决不同包下同名类问题
 */
public class UniqueNameGenerator extends AnnotationBeanNameGenerator {

    @Override
    public String generateBeanName(BeanDefinition definition, BeanDefinitionRegistry registry) {
        System.out.println("BeanDefinition: "+definition.getBeanClassName());
        String result = "";
        String urlStartStr = "com.example.demo";
        if(definition.getBeanClassName().startsWith(urlStartStr)){
            result = definition.getBeanClassName();
        } else {
            String[] strArr = definition.getBeanClassName().split("\\.");
            result = strArr[strArr.length-1];
            result = result.substring(0, 1).toLowerCase() + result.substring(1);
        }
        return result;
    }
}

二.在springboot启动类中配置自定义bean名称生成器，使其生效

@SpringBootApplication
@ComponentScan(basePackages = {"com.example.demo"}, nameGenerator = UniqueNameGenerator.class)
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

}

注：

@SpringBootApplication=@Configuration+@EnableAutoConfiguration+@ComponentScan

所以，当@SpringBootApplication和@ComponentScan注解共存时，@SpringBootApplication注解的扫描的作用将会失效，所以此时需要将@SpringBootApplication中扫描包放到@ComponentScan中