自动配置原理

SpringBoot特点

依赖管理

父项目做依赖管理

依赖管理
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.3.2.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

他的父项目
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-dependencies</artifactId>
    <version>2.3.2.RELEASE</version>
</parent>

依赖包的版本仲裁
<activemq.version>5.15.13</activemq.version>
<antlr2.version>2.7.7</antlr2.version>
<appengine-sdk.version>1.9.81</appengine-sdk.version>
<artemis.version>2.12.0</artemis.version>
<aspectj.version>1.9.6</aspectj.version>
<assertj.version>3.16.1</assertj.version>
<atomikos.version>4.0.6</atomikos.version>
<awaitility.version>4.0.3</awaitility.version>
<bitronix.version>2.1.4</bitronix.version>
<build-helper-maven-plugin.version>3.1.0</build-helper-maven-plugin.version>
<byte-buddy.version>1.10.13</byte-buddy.version>
<caffeine.version>2.8.5</caffeine.version>
<cassandra-driver.version>4.6.1</cassandra-driver.version>
<classmate.version>1.5.1</classmate.version>
<commons-codec.version>1.14</commons-codec.version>
......

加入场景启动器

***-spring-boot-starter 为场景启动器
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.1.3</version>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter</artifactId>
</dependency>

@ConfigurationProperties

配置文件的属性和实体类进行关联，只要容器中的组件才有这个功能

@ConfigurationProperties(prefix = "mycar")
public class Car {

    private String brand;
    private Integer price;

    public String getBrand() {
        return brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }

    public Integer getPrice() {
        return price;
    }

    public void setPrice(Integer price) {
        this.price = price;
    }

    @Override
    public String toString() {
        return "Car{" +
                "brand='" + brand + '\'' +
                ", price=" + price +
                '}';
    }
}

@EnableConfigurationProperties + @ConfigurationProperties或者**@Component + @ConfigurationProperties**

@EnableConfigurationProperties(Car.class)
//1、开启Car配置绑定功能
//2、把这个Car这个组件自动注册到容器中
public class MyConfig 
{
}

自动配置原理入门

@SpringBootApplication：

@SpringBootConfiguration
@EnableAutoConfiguration

@SpringBootConfiguration：可以发现它本质就是一个Configuration注解，一个spring的配置类

@Configuration
public @interface SpringBootConfiguration {}

@EnableAutoConfiguration

@AutoConfigurationPackage
@Import(AutoConfigurationImportSelector.class)

@AutoConfigurationPackage

自动配置包，给容器导入组件

@Import(AutoConfigurationPackages.Registrar.class)

static class Registrar implements ImportBeanDefinitionRegistrar, DeterminableImports {

   @Override
   public void registerBeanDefinitions(AnnotationMetadata metadata, BeanDefinitionRegistry registry) {
      register(registry, new PackageImports(metadata).getPackageNames().toArray(new String[0]));
   }

   @Override
   public Set<Object> determineImports(AnnotationMetadata metadata) {
      return Collections.singleton(new PackageImports(metadata));
   }

}

获取到包名的位置，将指定的一个包下的所有组件导入进来。

@Import(AutoConfigurationImportSelector.class)

// 给容器中批量导入组件
@Override
public String[] selectImports(AnnotationMetadata annotationMetadata) {
    if (!isEnabled(annotationMetadata)) {
        return NO_IMPORTS;
    }
    AutoConfigurationEntry autoConfigurationEntry = 
        // 核心方法 利用这个方法给容器中批量导入一些组件
        getAutoConfigurationEntry(annotationMetadata);
    return StringUtils.toStringArray(autoConfigurationEntry.getConfigurations());
}

protected AutoConfigurationEntry getAutoConfigurationEntry(AnnotationMetadata annotationMetadata) {
   if (!isEnabled(annotationMetadata)) {
      return EMPTY_ENTRY;
   }
   AnnotationAttributes attributes = getAttributes(annotationMetadata);
    // 这句是核心获取候选配置
   List<String> configurations = getCandidateConfigurations(annotationMetadata, attributes);
   configurations = removeDuplicates(configurations);
   Set<String> exclusions = getExclusions(annotationMetadata, attributes);
   checkExcludedClasses(configurations, exclusions);
   configurations.removeAll(exclusions);
   configurations = getConfigurationClassFilter().filter(configurations);
   fireAutoConfigurationImportEvents(configurations, exclusions);
   return new AutoConfigurationEntry(configurations, exclusions);
}

默认将235个组件导入到容器中

protected List<String> getCandidateConfigurations(AnnotationMetadata metadata, AnnotationAttributes attributes) {
    //这句是核心  读取配置
   List<String> configurations = SpringFactoriesLoader.loadFactoryNames(getSpringFactoriesLoaderFactoryClass(),
         getBeanClassLoader());
   Assert.notEmpty(configurations, "No auto configuration classes found in META-INF/spring.factories. If you "
         + "are using a custom packaging, make sure that file is correct.");
   return configurations;
}