Spring-：Who-calls-setbeanname（）？

<code class="java">// Spring容器初始化 (伪代码)
public class BeanFactory {
    public Object createBean(Class<?> beanClass, String beanName) {
        // 步骤1：实例化Bean
        Object bean = instantiateBean(beanClass);

        // 步骤2：检查Bean是否实现了BeanNameAware
        if (bean instanceof BeanNameAware) {
            // 步骤3：调用setBeanName()并传递Bean的名称
            ((BeanNameAware) bean).setBeanName(beanName);
        }

        // 步骤4：继续依赖注入和其他生命周期回调
        injectDependencies(bean);
        initializeBean(bean);

        return bean;
    }
}</code>

<code class="java">@Configuration
public class AppConfig {

    @Bean(name = "tenantA-dataSource")
    public TenantDataSource tenantADatasource() {
        return new TenantDataSource();
    }
}</code>

<code class="java">import org.springframework.beans.factory.BeanNameAware;

public class TenantDataSource implements BeanNameAware {
    private String tenantName;
    private String databaseUrl;

    @Override
    public void setBeanName(String beanName) {
        // 从Bean名称中提取租户名称
        if (beanName.contains("-")) {
            this.tenantName = beanName.split("-")[0];
        } else {
            throw new IllegalArgumentException("无效的Bean命名约定。预期格式：<tenantName>-dataSource");
        }

        // 基于租户名称动态分配数据库URL
        this.databaseUrl = "jdbc:mysql://localhost:3306/" + tenantName + "_db";
        System.out.println("setBeanName() called for: " + beanName + ", resolved tenant: " + tenantName);
    }

    public void connect() {
        System.out.println("连接到数据库：" + databaseUrl);
    }
}</code>

<code class="java">import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class Main {
    public static void main(String[] args) {
        // 初始化Spring上下文
        ApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);

        // 获取Bean
        TenantDataSource tenantA = (TenantDataSource) context.getBean("tenantA-dataSource");

        // 使用Bean
        tenantA.connect();
    }
}</code>

<code>setBeanName() called for: tenantA-dataSource, resolved tenant: tenantA
连接到数据库：jdbc:mysql://localhost:3306/tenantA_db</code>