diff --git "a/springboot-source-code-analysis/(3)345円267円245円345円216円202円345円212円240円350円275円275円346円234円272円345円210円266円350円247円243円346円236円220円.md" "b/springboot-source-code-analysis/(3)345円267円245円345円216円202円345円212円240円350円275円275円346円234円272円345円210円266円350円247円243円346円236円220円.md"
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--- "a/springboot-source-code-analysis/(3)345円267円245円345円216円202円345円212円240円350円275円275円346円234円272円345円210円266円350円247円243円346円236円220円.md"
+++ "b/springboot-source-code-analysis/(3)345円267円245円345円216円202円345円212円240円350円275円275円346円234円272円345円210円266円350円247円243円346円236円220円.md"
@@ -39,3 +39,148 @@ public final class SpringFactoriesLoader {
 
 image-20210616203348022
 
+
+
+#### 源码阅读
+
+##### 1、首先通过setInitializers#()方法设置系统初始化器
+
+```java
+	@SuppressWarnings({ "unchecked", "rawtypes" })
+	public SpringApplication(ResourceLoader resourceLoader, Class<?>... primarySources) {
+		this.resourceLoader = resourceLoader;
+		Assert.notNull(primarySources, "PrimarySources must not be null");
+		this.primarySources = new LinkedHashSet<strong>(Arrays.asList(primarySources));
+		this.webApplicationType = WebApplicationType.deduceFromClasspath();
+ // 通过setInitializers#()方法,设置系统初始化器
+		setInitializers((Collection) getSpringFactoriesInstances(ApplicationContextInitializer.class));
+		setListeners((Collection) getSpringFactoriesInstances(ApplicationListener.class));
+		this.mainApplicationClass = deduceMainApplicationClass();
+	}
+```
+
+
+
+##### 2、获取系统初始化器实现的全路径名,为它们创建实例子,最终把它们进行排序后注入到Spring容器集合中
+
+```java
+	private <t> Collection<t> getSpringFactoriesInstances(Class<t> type, Class<?>[] parameterTypes, Object... args) {
+ // 获得类加载器
+		ClassLoader classLoader = getClassLoader();
+ // 通过这个SpringFactoriesLoader#loadFactoryNames方法获取Spring中所有系统初始化器实现的全路径名
+		Set<string> names = new LinkedHashSet<strong>(SpringFactoriesLoader.loadFactoryNames(type, classLoader));
+ // 通过createSpringFactoriesInstances#()创建它们的实例
+		List<t> instances = createSpringFactoriesInstances(type, parameterTypes, classLoader, args, names);
+ // 通过注解@Order进行排序
+		AnnotationAwareOrderComparator.sort(instances);
+		return instances;
+	}
+```
+
+
+
+##### 3、获取系统初始化器实现的全路径名
+
+```java
+	private static Map<string, List<string>> loadSpringFactories(@Nullable ClassLoader classLoader) {
+		MultiValueMap<string, String> result = cache.get(classLoader);
+ // 检查是否有缓存
+		if (result != null) {
+			return result;
+		}
+
+		try {
+			Enumeration<url> urls = (classLoader != null ?
+				 // 获取 META-INF/spring.factories下所有系统初始化器的实现 
+					classLoader.getResources(FACTORIES_RESOURCE_LOCATION) :
+					ClassLoader.getSystemResources(FACTORIES_RESOURCE_LOCATION));
+			result = new LinkedMultiValueMap<strong>();
+			while (urls.hasMoreElements()) {
+				URL url = urls.nextElement();
+				UrlResource resource = new UrlResource(url);
+ // 通过url路径,获取spring.factories中的配置,并将其转成Properties格式
+				Properties properties = PropertiesLoaderUtils.loadProperties(resource);
+				for (Map.Entry<?, ?> entry : properties.entrySet()) {
+					String factoryClassName = ((String) entry.getKey()).trim();
+					for (String factoryName : StringUtils.commaDelimitedListToStringArray((String) entry.getValue())) {
+ // 将初始化器的包名进行返回
+						result.add(factoryClassName, factoryName.trim());
+					}
+				}
+			}
+ // 记录到缓存中
+			cache.put(classLoader, result);
+			return result;
+		}
+		catch (IOException ex) {
+			throw new IllegalArgumentException("Unable to load factories from location [" +
+					FACTORIES_RESOURCE_LOCATION + "]", ex);
+		}
+	}
+```
+
+
+
+##### 4、创建初始化器的实例
+
+```java
+	@SuppressWarnings("unchecked")
+	private <t> List<t> createSpringFactoriesInstances(Class<t> type, Class<?>[] parameterTypes,
+			ClassLoader classLoader, Object[] args, Set<string> names) {
+		List<t> instances = new ArrayList<strong>(names.size());
+		for (String name : names) {
+			try {
+ // 通过反射获取具体实现,并完成类的初始化,最终返回实现类的实例
+				Class<?> instanceClass = ClassUtils.forName(name, classLoader);
+				Assert.isAssignable(type, instanceClass);
+				Constructor<?> constructor = instanceClass.getDeclaredConstructor(parameterTypes);
+				T instance = (T) BeanUtils.instantiateClass(constructor, args);
+				instances.add(instance);
+			}
+			catch (Throwable ex) {
+				throw new IllegalArgumentException("Cannot instantiate " + type + " : " + name, ex);
+			}
+		}
+		return instances;
+	}
+```
+
+
+
+##### 5、按@Order注解进行排序
+
+```java
+	private <t> Collection<t> getSpringFactoriesInstances(Class<t> type, Class<?>[] parameterTypes, Object... args) {
+		ClassLoader classLoader = getClassLoader();
+		// Use names and ensure unique to protect against duplicates
+		Set<string> names = new LinkedHashSet<strong>(SpringFactoriesLoader.loadFactoryNames(type, classLoader));
+		List<t> instances = createSpringFactoriesInstances(type, parameterTypes, classLoader, args, names);
+ // 按@Order注解进行排序,值约小的越靠前
+		AnnotationAwareOrderComparator.sort(instances);
+		return instances;
+	}
+```
+
+
+
+##### 6、将初始化器排序好的实例注册到Spring容器中
+
+```java
+	public void setInitializers(Collection<? extends ApplicationContextInitializer<?>> initializers) {
+		this.initializers = new ArrayList<strong>();
+ // 将初始化器的实例添加到Spring容器中
+		this.initializers.addAll(initializers);
+	}
+```
+
+
+
+#### 总结
+
+- SpringFactoriesLoader作用: SpringBoot框架中从类路径jar包中读取特定的文件(META-INF/spring.factories)实现扩展类的载入
+
+image-20210726172128392
+
+- LoadFactories流程
+
+image-20210726172754618
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