实例化META-INF/spring.factories

1. example

   1
   org.springframework.boot.SpringApplication#getSpringFactoriesInstances(java.lang.Class<T>, java.lang.Class<?>[], java.lang.Object...)
   

2. 加载spring.factories
   • 传入ClassLoader使得真正所有包下的META-INF/spring.factories
   • 读取文件后按照ClassLoader缓存键值对

     1
     org.springframework.core.io.support.SpringFactoriesLoader#loadSpringFactories
     

3. 使用反射初始化

4. 普通springboot项目

1
2
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0 = {URL@2329} "jar:file:/Users/edz/.m2/repository/org/springframework/boot/spring-boot/2.4.0/spring-boot-2.4.0.jar!/META-INF/spring.factories"
1 = {URL@2330} "jar:file:/Users/edz/.m2/repository/org/springframework/boot/spring-boot-autoconfigure/2.4.0/spring-boot-autoconfigure-2.4.0.jar!/META-INF/spring.factories"
2 = {URL@2331} "jar:file:/Users/edz/.m2/repository/org/springframework/spring-beans/5.3.1/spring-beans-5.3.1.jar!/META-INF/spring.factories"

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