Spring学习

• Spring1
  • 3、HelloSpring
  • 4、IOC创建对象方式
  • 5、Spring配置
• Spring2
• Spring3
  • • 单例模式（面试）
• Spring4
  • • 使用Java来配置bean
      • pojo类包
      • config包
        • 1+（1+3）@Component+(@Configuration+@Bean)
        • 1+（2+3）@Component+(@ComponentScan+@bean)
        • 1+（3）@Component+(@bean)
        • （2+3）(@ComponentScan+@bean )
        • （1+3）(@Configuration+@bean)
• Spring5
• Spring6

Spring1

3、HelloSpring

4、IOC创建对象方式

4.1 方式一
4.2 方式二

5、Spring配置

5.1 别名
5.2 Bean的配置
5.3 import

Spring2

Spring3

单例模式（面试）

Spring4

使用Java来配置bean

spring官方的文档有这样一段描述，context:component-scan base-package/@ComponentScan will do an auto-scanning. Assuming each class that has to become a bean is annotated with a correct annotation like @Component (for simple bean) or @Controller (for a servlet control) or @Repository (for DAO classes) and these classes are somewhere under the package, Spring will find all of these and create a bean for each one.
这里@componetScan或context:component-scan base-package会扫描将带有注解@Component的类注册为bean。无关@Configuration和@Bean

pojo类包

1、@Component

config包

1、@Configuration
2、@ComponentScan("com.github.pojo")
3、在方法上添加注解@Bean

1+（1+3）@Component+(@Configuration+@Bean)

1+（2+3）@Component+(@ComponentScan+@bean)

1+（3）@Component+(@bean)

（2+3）(@ComponentScan+@bean )

（1+3）(@Configuration+@bean)

Spring5

Spring6