feat:新增Spring默认BeanName文章

spring/Spring默认BeanName.md

@@ -0,0 +1,54 @@
+先说结论：
+1、XML配置和注解生成默认BeanName的机制是不同的
+2、XML配置默认BeanName = 全类名 + # + 数字，如 com.anyway.p2024.service.impl.BigHouseServiceImpl#0
+3、注解默认BeanName = 短类名首字母变成小写，如 bigHouseServiceImpl
+	**注意：如果短类名前2个字母都是大写，则保持短类名不变，比如 ALibaba**
+
+## 示例
+
+com.anyway.p2024.service.BigHouseService
+```java
+public interface BigHouseService {  
+}
+```
+com.anyway.p2024.service.impl.BigHouseServiceImpl
+```java
+@Service  
+public class BigHouseServiceImpl implements BigHouseService {  
+}
+```
+com.anyway.p2024.service.impl.BigHouseServiceImpl2
+```java
+@Service  
+public class BigHouseServiceImpl2 implements BigHouseService {  
+}
+```
+com.anyway.p2024.domain.ALibaba
+```java
+@Component  
+public class ALibaba {  
+}
+```
+applicationContext.xml
+```xml
+<context:annotation-config />  
+<context:component-scan base-package="com.anyway" />  
+  
+<bean class="com.anyway.p2024.service.impl.BigHouseServiceImpl" />  
+<bean class="com.anyway.p2024.domain.ALibaba" />  
+<bean class="com.anyway.p2024.domain.ALibaba" />
+```
+Demo04.java
+```java
+ApplicationContext ac = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");  
+System.out.println(JSON.toJSON(BeanFactoryUtils.beanNamesForTypeIncludingAncestors(ac, BigHouseService.class)));  
+System.out.println(JSON.toJSON(BeanFactoryUtils.beanNamesForTypeIncludingAncestors(ac, ALibaba.class)));
+```
+输出如下：
+```
+["bigHouseServiceImpl","bigHouseServiceImpl2","com.anyway.p2024.service.impl.BigHouseServiceImpl#0"]
+["ALibaba","com.anyway.p2024.domain.ALibaba#0","com.anyway.p2024.domain.ALibaba#1"]
+```
+
+思考题：
+如果将 com.anyway.p2024.domain.ALibaba 复制到  com.anyway.p2024.service.ALibaba ，执行 Demo04.java 会输出什么？