@Bean注解修饰的bean是怎么注入spring容器的，@Configuration呢？

痛定思痛。 2022-10-07 06:58 133阅读 0赞

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例如下面定义的bean：

@EnableAspectJAutoProxy
    @Configuration
    @PropertySource(value = "classpath:user.properties", encoding = "UTF-8")
    @ComponentScan(value = "fengge.dao")
    @ImportResource("classpath:demo.xml")
    @Import({ A.class, B.class})
    public class AopOneConfig implements DemoInterface{ 
    
        @Bean
        public AopOne aopOne() { 
            return new AopOne();
        }
    
        @Bean
        @ConditionalOnBean(name = "aopOne") // 如果aopOne存在才实例化AopOneAspect
        public AopOneAspect oneAspect() { 
            return new AopOneAspect();
        }
    
        @Override
        public String selectData() { 
            return "ok";
        }
    
        @Component
        class InnerClass{ 
    
        }
    }

这里的aopOne这个bean是怎么注入spring的？我们去看源码是怎么处理的。

> # 一、@Configuration注解是怎么解析的？ #

要想搞清楚@Bean注解修饰的aopOne是怎么注入spring容器的，那就先要知道@Configuration修饰的AopOneConfig是怎么被spring解析处理的。这个很好理解，要是AopOneConfig 都没被spring解析到，那怎么可能识别aopOne呢？

@Configuration修饰的类是怎么被解析的呢？Spring提供了一个 `ConfigurationClassParser` 类，它的 `parse` 方法用来解析每一个@Configuration修饰的类。

为很好的说明，我们准备了下面的测试代码，方便打断点及查看：

@EnableAspectJAutoProxy
    @Configuration
    public class AopOneConfig { 
        @Bean
        public AopOne aopOne() { 
            return new AopOne();
        }
    
        @Bean
        @ConditionalOnBean(name = "aopOne") // 如果aopOne存在才实例化AopOneAspect
        public AopOneAspect oneAspect() { 
            return new AopOneAspect();
        }
    }

@Test
        public void test2() { 
            AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(AopOneConfig.class);
            AopOne bean = applicationContext.getBean(AopOne.class);
            bean.compute(10, 1);
        }

## 1.1 调用链 ##

`AnnotationConfigApplicationContext` \# `refresh` \# `invokeBeanFactoryPostProcessors` \# `invokeBeanFactoryPostProcessors` \# `invokeBeanDefinitionRegistryPostProcessors` \# `BeanDefinitionRegistryPostProcessor` \# `postProcessBeanDefinitionRegistry` \# `processConfigBeanDefinitions` \# `parse` \# `parse` \# `processConfigurationClass` \# `doProcessConfigurationClass`

调用链有点长，前面的在 [【一篇搞懂】Sping 容器启动过程详解][Sping]  
已经说过这个链路上的很多方法，这里从 `invokeBeanDefinitionRegistryPostProcessors` 说起。

## 1.2 整体流程源码 ##

### 1.2.1 invokeBeanDefinitionRegistryPostProcessors ###

/** * Invoke the given BeanDefinitionRegistryPostProcessor beans. */
    	private static void invokeBeanDefinitionRegistryPostProcessors(
    			Collection<? extends BeanDefinitionRegistryPostProcessor> postProcessors, BeanDefinitionRegistry registry) { 
    
    		for (BeanDefinitionRegistryPostProcessor postProcessor : postProcessors) { 
    			postProcessor.postProcessBeanDefinitionRegistry(registry);
    		}
    	}

上面的代码主要BeanDefinitionRegistry后置处理器进行bean定义的扫描，这里传过的BeanDefinitionRegistry后置处理器是由上一步循环获取到的，如下：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTIzMTkyOA_size_16_color_FFFFFF_t_70]  
我们打个断点看下这里到底有哪些BeanDefinitionRegistry后置处理器：![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTIzMTkyOA_size_16_color_FFFFFF_t_70 1]  
可以看到这里只传入了一个 `ConfigurationClassPostProcessor`，那从上面的源码知道后面调用的就是它的 `postProcessBeanDefinitionRegistry` 方法，接下来看下这个方法。

### 1.2.2 postProcessBeanDefinitionRegistry ###

@Override
    	public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) { 
    		int registryId = System.identityHashCode(registry);
    		if (this.registriesPostProcessed.contains(registryId)) { 
    			throw new IllegalStateException(
    					"postProcessBeanDefinitionRegistry already called on this post-processor against " + registry);
    		}
    		if (this.factoriesPostProcessed.contains(registryId)) { 
    			throw new IllegalStateException(
    					"postProcessBeanFactory already called on this post-processor against " + registry);
    		}
    		this.registriesPostProcessed.add(registryId);
    
    		processConfigBeanDefinitions(registry);
    	}

这个方法是 `ConfigurationClassPostProcessor` 类里面的方法，前面主要是为传入的registry获取它的对应HashCode-- Id，registriesPostProcessed 和 factoriesPostProcessed 都是一个Set集合，确保这个Id是唯一的。

private final Set<Integer> registriesPostProcessed = new HashSet<>();
    private final Set<Integer> factoriesPostProcessed = new HashSet<>();

最核心的方法就是 `processConfigBeanDefinitions`。

### 1.2.3 processConfigBeanDefinitions ###

/** * Build and validate a configuration model based on the registry of * {@link Configuration} classes. */
    	public void processConfigBeanDefinitions(BeanDefinitionRegistry registry) { 
    		List<BeanDefinitionHolder> configCandidates = new ArrayList<>();
    		String[] candidateNames = registry.getBeanDefinitionNames();
    
    		for (String beanName : candidateNames) { 
    			BeanDefinition beanDef = registry.getBeanDefinition(beanName);
    			if (ConfigurationClassUtils.isFullConfigurationClass(beanDef) ||
    					ConfigurationClassUtils.isLiteConfigurationClass(beanDef)) { 
    				if (logger.isDebugEnabled()) { 
    					logger.debug("Bean definition has already been processed as a configuration class: " + beanDef);
    				}
    			}
    			else if (ConfigurationClassUtils.checkConfigurationClassCandidate(beanDef, this.metadataReaderFactory)) { 
    				configCandidates.add(new BeanDefinitionHolder(beanDef, beanName));
    			}
    		}
    
    		// Return immediately if no @Configuration classes were found
    		if (configCandidates.isEmpty()) { 
    			return;
    		}
    
    		// Sort by previously determined @Order value, if applicable
    		configCandidates.sort((bd1, bd2) -> { 
    			int i1 = ConfigurationClassUtils.getOrder(bd1.getBeanDefinition());
    			int i2 = ConfigurationClassUtils.getOrder(bd2.getBeanDefinition());
    			return Integer.compare(i1, i2);
    		});
    
    		// Detect any custom bean name generation strategy supplied through the enclosing application context
    		SingletonBeanRegistry sbr = null;
    		if (registry instanceof SingletonBeanRegistry) { 
    			sbr = (SingletonBeanRegistry) registry;
    			if (!this.localBeanNameGeneratorSet) { 
    				BeanNameGenerator generator = (BeanNameGenerator) sbr.getSingleton(CONFIGURATION_BEAN_NAME_GENERATOR);
    				if (generator != null) { 
    					this.componentScanBeanNameGenerator = generator;
    					this.importBeanNameGenerator = generator;
    				}
    			}
    		}
    
    		if (this.environment == null) { 
    			this.environment = new StandardEnvironment();
    		}
    
    		// Parse each @Configuration class
    		ConfigurationClassParser parser = new ConfigurationClassParser(
    				this.metadataReaderFactory, this.problemReporter, this.environment,
    				this.resourceLoader, this.componentScanBeanNameGenerator, registry);
    
    		Set<BeanDefinitionHolder> candidates = new LinkedHashSet<>(configCandidates);
    		Set<ConfigurationClass> alreadyParsed = new HashSet<>(configCandidates.size());
    		do { 
    			parser.parse(candidates);
    			parser.validate();
    
    			Set<ConfigurationClass> configClasses = new LinkedHashSet<>(parser.getConfigurationClasses());
    			configClasses.removeAll(alreadyParsed);
    
    			// Read the model and create bean definitions based on its content
    			if (this.reader == null) { 
    				this.reader = new ConfigurationClassBeanDefinitionReader(
    						registry, this.sourceExtractor, this.resourceLoader, this.environment,
    						this.importBeanNameGenerator, parser.getImportRegistry());
    			}
    			this.reader.loadBeanDefinitions(configClasses);
    			alreadyParsed.addAll(configClasses);
    
    			candidates.clear();
    			if (registry.getBeanDefinitionCount() > candidateNames.length) { 
    				String[] newCandidateNames = registry.getBeanDefinitionNames();
    				Set<String> oldCandidateNames = new HashSet<>(Arrays.asList(candidateNames));
    				Set<String> alreadyParsedClasses = new HashSet<>();
    				for (ConfigurationClass configurationClass : alreadyParsed) { 
    					alreadyParsedClasses.add(configurationClass.getMetadata().getClassName());
    				}
    				for (String candidateName : newCandidateNames) { 
    					if (!oldCandidateNames.contains(candidateName)) { 
    						BeanDefinition bd = registry.getBeanDefinition(candidateName);
    						if (ConfigurationClassUtils.checkConfigurationClassCandidate(bd, this.metadataReaderFactory) &&
    								!alreadyParsedClasses.contains(bd.getBeanClassName())) { 
    							candidates.add(new BeanDefinitionHolder(bd, candidateName));
    						}
    					}
    				}
    				candidateNames = newCandidateNames;
    			}
    		}
    		while (!candidates.isEmpty());
    
    		// Register the ImportRegistry as a bean in order to support ImportAware @Configuration classes
    		if (sbr != null && !sbr.containsSingleton(IMPORT_REGISTRY_BEAN_NAME)) { 
    			sbr.registerSingleton(IMPORT_REGISTRY_BEAN_NAME, parser.getImportRegistry());
    		}
    
    		if (this.metadataReaderFactory instanceof CachingMetadataReaderFactory) { 
    			// Clear cache in externally provided MetadataReaderFactory; this is a no-op
    			// for a shared cache since it'll be cleared by the ApplicationContext.
    			((CachingMetadataReaderFactory) this.metadataReaderFactory).clearCache();
    		}
    	}

这个很长也很重要，主要是对 `@Configuration` 注解修饰的类进行校验、解析、处理。具体的逻辑说半天不如打个断点看下：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTIzMTkyOA_size_16_color_FFFFFF_t_70 2]  
candidateNames存储的是已经注册的所有BeanDefinitionName：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTIzMTkyOA_size_16_color_FFFFFF_t_70 3]  
接下来说说ConfigurationClassUtils类中的几个重要方法：  
方法：`isFullConfigurationClass`  
作用：判断是否是full configuration，带有@Configuration注解的类叫做full configuration，需要注意的是，该方法中并不直接判断是否带有Configuration注解，而是判断bean.getAttribute是否标记为FULL。  
方法：`isLiteConfigurationClass`  
作用：判断是否是lite configuration，带@Component，@ComponentScan，@Import，@ImportResource，@Bean 5个注解中的任一个，那么这个类叫做lite configuration。  
方法：`checkConfigurationClassCandidate`  
作用：判断是否是configuration class，如果isFullConfigurationClass或者isLiteConfigurationClass，那么就是configuration class。  
![在这里插入图片描述][20210617203930307.png]  
![在这里插入图片描述][20210617203939670.png]

public static boolean checkConfigurationClassCandidate(
    			BeanDefinition beanDef, MetadataReaderFactory metadataReaderFactory) { 
    			
    		String className = beanDef.getBeanClassName();
    		if (className == null || beanDef.getFactoryMethodName() != null) { 
    			return false;
    		}
    		AnnotationMetadata metadata;
    		if (beanDef instanceof AnnotatedBeanDefinition &&
    				className.equals(((AnnotatedBeanDefinition) beanDef).getMetadata().getClassName())) { 
    			// Can reuse the pre-parsed metadata from the given BeanDefinition...
    			metadata = ((AnnotatedBeanDefinition) beanDef).getMetadata();
    		}
    		else if (beanDef instanceof AbstractBeanDefinition && ((AbstractBeanDefinition) beanDef).hasBeanClass()) { 
    			// Check already loaded Class if present...
    			// since we possibly can't even load the class file for this Class.
    			Class<?> beanClass = ((AbstractBeanDefinition) beanDef).getBeanClass();
    			metadata = new StandardAnnotationMetadata(beanClass, true);
    		}
    		else { 
    			try { 
    				MetadataReader metadataReader = metadataReaderFactory.getMetadataReader(className);
    				metadata = metadataReader.getAnnotationMetadata();
    			}
    			catch (IOException ex) { 
    				if (logger.isDebugEnabled()) { 
    					logger.debug("Could not find class file for introspecting configuration annotations: " +
    							className, ex);
    				}
    				return false;
    			}
    		}
    		if (isFullConfigurationCandidate(metadata)) { 
    			beanDef.setAttribute(CONFIGURATION_CLASS_ATTRIBUTE, CONFIGURATION_CLASS_FULL);
    		}
    		else if (isLiteConfigurationCandidate(metadata)) { 
    			beanDef.setAttribute(CONFIGURATION_CLASS_ATTRIBUTE, CONFIGURATION_CLASS_LITE);
    		}
    		else { 
    			return false;
    		}
    		// It's a full or lite configuration candidate... Let's determine the order value, if any.
    		Integer order = getOrder(metadata);
    		if (order != null) { 
    			beanDef.setAttribute(ORDER_ATTRIBUTE, order);
    		}
    		return true;
    	}

上面的断点可以看到：  
![在这里插入图片描述][20210617204129315.png]  
configCandidates只会有aopOneConfig这一个元素。就像源码里注释的一样， configCandidates若为空，说明没有 @Configuration 修饰的类被找到。  
接下来就是为 configCandidates 里面的元素进行排序，会考虑 `@Order` 注解标注的顺序（如果有）。  
再接下来就是检测封闭的应用程序上下文提供的任何自定义bean名称生成策略，看看有无自定义bean名称生成器。  
再接下来就是重点了！已经确定了`@Configuration` 注解修饰的类，也进行了校验，那 `ConfigurationClassParser` 就要对这个类进行解析了。  
后面会详细介绍 `ConfigurationClassParser` 解析的过程，这里先把 `processConfigBeanDefinitions` 的流程梳理完。  
打个断点看看解析出来的结果是啥样的：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTIzMTkyOA_size_16_color_FFFFFF_t_70 4]  
可以看到，configClasses已经是aopOneConfig了，这时虽然aopOneConfig这个bean的信息（源码里注释所说的model）已经被解析了，但是还不能以此信息直接创建bean，因为beanFactory是根据BeanDefinition去创建的。那就要根据这些解析出来的信息来创建aopOneConfig的bean definitions。  
![在这里插入图片描述][20210617211204311.png]  
创建读取完全填充好的ConfigurationClass实例的读取器 `this.reader`，其loadBeanDefinitions方法将完全填充好的ConfigurationClass实例转化成BeanDefinition注册入IOC容器。  
其实不止aopOneConfig，它里面的aopOne、oneAspect的bean definitions也是在loadBeanDefinitions这个方法被注册到容器中（这个方法也是比较复杂，本文后面会详细说明）。  
所以在完成上面的步骤后，registry里注册的BeanDefinition数量就比candidateNames里元素数量多了，于是有了下面的判断及处理：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTIzMTkyOA_size_16_color_FFFFFF_t_70 5]  
用了newCandidateNames去保存此时容器中所有的beanName，然后在for循环中对于在newCandidateNames而不在oldCandidateNames里的元素，创建它们的BeanDefinition。  
到这里基本走完了 `@Configuration` 修饰的类是怎么被解析的流程。

## 1.3 核心源码 ##

上面为了不影响对整体流程的说明，对于部分核心源代码并未展开说明，比如 `ConfigurationClassParser` 的 `parse` 方法，接下来详细说明下。

### 1.3.1 ConfigurationClassParser\#parser（candidates） ###

public void parse(Set<BeanDefinitionHolder> configCandidates) { 
    		for (BeanDefinitionHolder holder : configCandidates) { 
    			BeanDefinition bd = holder.getBeanDefinition();
    			try { 
    				if (bd instanceof AnnotatedBeanDefinition) { 
    					parse(((AnnotatedBeanDefinition) bd).getMetadata(), holder.getBeanName());
    				}
    				else if (bd instanceof AbstractBeanDefinition && ((AbstractBeanDefinition) bd).hasBeanClass()) { 
    					parse(((AbstractBeanDefinition) bd).getBeanClass(), holder.getBeanName());
    				}
    				else { 
    					parse(bd.getBeanClassName(), holder.getBeanName());
    				}
    			}
    			catch (BeanDefinitionStoreException ex) { 
    				throw ex;
    			}
    			catch (Throwable ex) { 
    				throw new BeanDefinitionStoreException(
    						"Failed to parse configuration class [" + bd.getBeanClassName() + "]", ex);
    			}
    		}
    		this.deferredImportSelectorHandler.process();
    	}

这个 `ConfigurationClassParser#parser(candidates)` 里面又包含了三个 `parse` 方法，是传参不同的重载方法。

protected final void parse(@Nullable String className, String beanName) throws IOException { 
    		Assert.notNull(className, "No bean class name for configuration class bean definition");
    		MetadataReader reader = this.metadataReaderFactory.getMetadataReader(className);
    		processConfigurationClass(new ConfigurationClass(reader, beanName));
    	}
    
    	protected final void parse(Class<?> clazz, String beanName) throws IOException { 
    		processConfigurationClass(new ConfigurationClass(clazz, beanName));
    	}
    
    	protected final void parse(AnnotationMetadata metadata, String beanName) throws IOException { 
    		processConfigurationClass(new ConfigurationClass(metadata, beanName));
    	}

以上可以看到，三个方法最后都是调用 `processConfigurationClass` 这个方法：

protected void processConfigurationClass(ConfigurationClass configClass) throws IOException { 
    		if (this.conditionEvaluator.shouldSkip(configClass.getMetadata(), ConfigurationPhase.PARSE_CONFIGURATION)) { 
    			return;
    		}
    		ConfigurationClass existingClass = this.configurationClasses.get(configClass);
    		if (existingClass != null) { 
    			if (configClass.isImported()) { 
    				if (existingClass.isImported()) { 
    					existingClass.mergeImportedBy(configClass);
    				}
    				// Otherwise ignore new imported config class; existing non-imported class overrides it.
    				return;
    			}
    			else { 
    				// Explicit bean definition found, probably replacing an import.
    				// Let's remove the old one and go with the new one.
    				this.configurationClasses.remove(configClass);
    				this.knownSuperclasses.values().removeIf(configClass::equals);
    			}
    		}
    		// Recursively process the configuration class and its superclass hierarchy.
    		SourceClass sourceClass = asSourceClass(configClass);
    		do { 
    			sourceClass = doProcessConfigurationClass(configClass, sourceClass);
    		}
    		while (sourceClass != null);
    		this.configurationClasses.put(configClass, configClass);
    	}

上面这个方法中，开始的 `this.conditionEvaluator.shouldSkip` 主要用于完成条件注解 `@Conditional` 的解析和判断。 `@Conditional` 注解使得只有在特定条件满足时才启用一些配置，shouldSkip就是用于判断@Conditional下的而配置是否被启用。若返回true，则说明 `@Conditional` 注解生效，不会接着创建这个bean。若没有加`@Conditional` 注解，这个方法一般返回 false，会继续下面的流程。

接着检查这个 `@Configuration` 注解的类（configClass）是否已经解析过，解析过的configClass都会在这个 `parse` 方法的最后put到`this.configurationClasses` 这个Map里面，若Map里有则说明已经解析过了。那就会将 `existingClass` 里面之前解析的和现在的进行合并。

接下来 `asSourceClass(configClass)` 递归处理这个configClass及其超类的层次结构：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTIzMTkyOA_size_16_color_FFFFFF_t_70 6]  
最后还有个重要的 `doProcessConfigurationClass` 方法，从这个方法名就知道这个是要真正处理 ConfigurationClass 了：

/** * Apply processing and build a complete {@link ConfigurationClass} by reading the * annotations, members and methods from the source class. This method can be called * multiple times as relevant sources are discovered. * @param configClass the configuration class being build * @param sourceClass a source class * @return the superclass, or {@code null} if none found or previously processed */
    	@Nullable
    	protected final SourceClass doProcessConfigurationClass(ConfigurationClass configClass, SourceClass sourceClass)
    			throws IOException { 
    
    		if (configClass.getMetadata().isAnnotated(Component.class.getName())) { 
    			// Recursively process any member (nested) classes first
    			processMemberClasses(configClass, sourceClass);
    		}
    
    		// Process any @PropertySource annotations
    		for (AnnotationAttributes propertySource : AnnotationConfigUtils.attributesForRepeatable(
    				sourceClass.getMetadata(), PropertySources.class,
    				org.springframework.context.annotation.PropertySource.class)) { 
    			if (this.environment instanceof ConfigurableEnvironment) { 
    				processPropertySource(propertySource);
    			}
    			else { 
    				logger.info("Ignoring @PropertySource annotation on [" + sourceClass.getMetadata().getClassName() +
    						"]. Reason: Environment must implement ConfigurableEnvironment");
    			}
    		}
    
    		// Process any @ComponentScan annotations
    		Set<AnnotationAttributes> componentScans = AnnotationConfigUtils.attributesForRepeatable(
    				sourceClass.getMetadata(), ComponentScans.class, ComponentScan.class);
    		if (!componentScans.isEmpty() &&
    				!this.conditionEvaluator.shouldSkip(sourceClass.getMetadata(), ConfigurationPhase.REGISTER_BEAN)) { 
    			for (AnnotationAttributes componentScan : componentScans) { 
    				// The config class is annotated with @ComponentScan -> perform the scan immediately
    				Set<BeanDefinitionHolder> scannedBeanDefinitions =
    						this.componentScanParser.parse(componentScan, sourceClass.getMetadata().getClassName());
    				// Check the set of scanned definitions for any further config classes and parse recursively if needed
    				for (BeanDefinitionHolder holder : scannedBeanDefinitions) { 
    					BeanDefinition bdCand = holder.getBeanDefinition().getOriginatingBeanDefinition();
    					if (bdCand == null) { 
    						bdCand = holder.getBeanDefinition();
    					}
    					if (ConfigurationClassUtils.checkConfigurationClassCandidate(bdCand, this.metadataReaderFactory)) { 
    						parse(bdCand.getBeanClassName(), holder.getBeanName());
    					}
    				}
    			}
    		}
    
    		// Process any @Import annotations
    		processImports(configClass, sourceClass, getImports(sourceClass), true);
    
    		// Process any @ImportResource annotations
    		AnnotationAttributes importResource =
    				AnnotationConfigUtils.attributesFor(sourceClass.getMetadata(), ImportResource.class);
    		if (importResource != null) { 
    			String[] resources = importResource.getStringArray("locations");
    			Class<? extends BeanDefinitionReader> readerClass = importResource.getClass("reader");
    			for (String resource : resources) { 
    				String resolvedResource = this.environment.resolveRequiredPlaceholders(resource);
    				configClass.addImportedResource(resolvedResource, readerClass);
    			}
    		}
    
    		// Process individual @Bean methods
    		Set<MethodMetadata> beanMethods = retrieveBeanMethodMetadata(sourceClass);
    		for (MethodMetadata methodMetadata : beanMethods) { 
    			configClass.addBeanMethod(new BeanMethod(methodMetadata, configClass));
    		}
    
    		// Process default methods on interfaces
    		processInterfaces(configClass, sourceClass);
    
    		// Process superclass, if any
    		if (sourceClass.getMetadata().hasSuperClass()) { 
    			String superclass = sourceClass.getMetadata().getSuperClassName();
    			if (superclass != null && !superclass.startsWith("java") &&
    					!this.knownSuperclasses.containsKey(superclass)) { 
    				this.knownSuperclasses.put(superclass, configClass);
    				// Superclass found, return its annotation metadata and recurse
    				return sourceClass.getSuperClass();
    			}
    		}
    
    		// No superclass -> processing is complete
    		return null;
    	}

上面的源代码中注意下注释，可以看到一些熟悉的注解：

*  `@PropertySource` 加载指定的配置文件。参考：[如何引用 application.yml 或者 application.properties 之外的其它配置文件？][application.yml _ application.properties]
 *  `@ComponentScan` 在配置类上添加该注解，默认会扫描该类所在的包下所有的配置类，参考： [@ComponentScan配置老扫描不到Bean，这下彻底搞懂][ComponentScan_Bean]
 *  `@Import` 向spring容器中注入指定的bean，参考：[向spring容器中注入bean有哪些方式？大总结！][spring_bean]
 *  `@ImportResource` 导入Spring的配置文件，让配置文件里面的内容生效。参考：[如何引用 application.yml 或者 application.properties 之外的其它配置文件？][application.yml _ application.properties]
 *  `@Bean` 容器中添加组件，参考：[向spring容器中注入bean有哪些方式？大总结！][spring_bean]

所以大概的流程大家都能猜到，就是去看下有无这些注解，并给与相应的处理。一点一点去看：

#### (1) processMemberClasses ####

首先，查看这个configClass是否有内部类，有的话通过 `processMemberClasses` 处理：

private void processMemberClasses(ConfigurationClass configClass, SourceClass sourceClass) throws IOException { 
    		Collection<SourceClass> memberClasses = sourceClass.getMemberClasses();
    		if (!memberClasses.isEmpty()) { 
    			List<SourceClass> candidates = new ArrayList<>(memberClasses.size());
    			for (SourceClass memberClass : memberClasses) { 
    				if (ConfigurationClassUtils.isConfigurationCandidate(memberClass.getMetadata()) &&
    						!memberClass.getMetadata().getClassName().equals(configClass.getMetadata().getClassName())) { 
    					candidates.add(memberClass);
    				}
    			}
    			OrderComparator.sort(candidates);
    			for (SourceClass candidate : candidates) { 
    				if (this.importStack.contains(configClass)) { 
    					this.problemReporter.error(new CircularImportProblem(configClass, this.importStack));
    				}
    				else { 
    					this.importStack.push(configClass);
    					try { 
    						processConfigurationClass(candidate.asConfigClass(configClass));
    					}
    					finally { 
    						this.importStack.pop();
    					}
    				}
    			}
    		}
    	}

我们的测试代码 AopOneConfig 里有个 内部类 InnerClass，打个断点看下：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTIzMTkyOA_size_16_color_FFFFFF_t_70 7]  
可以看到就是在这里处理的内部类，对这个内部类的处理和对其外部类处理是一样的，因为你可以看到这个方法最后又回头调用了 `processConfigurationClass` 方法。

#### (2) processPropertySource ####

接着就是处理 `@PropertySource` 注解配置：

private void processPropertySource(AnnotationAttributes propertySource) throws IOException { 
    		String name = propertySource.getString("name");
    		if (!StringUtils.hasLength(name)) { 
    			name = null;
    		}
    		String encoding = propertySource.getString("encoding");
    		if (!StringUtils.hasLength(encoding)) { 
    			encoding = null;
    		}
    		String[] locations = propertySource.getStringArray("value");
    		Assert.isTrue(locations.length > 0, "At least one @PropertySource(value) location is required");
    		boolean ignoreResourceNotFound = propertySource.getBoolean("ignoreResourceNotFound");
    
    		Class<? extends PropertySourceFactory> factoryClass = propertySource.getClass("factory");
    		PropertySourceFactory factory = (factoryClass == PropertySourceFactory.class ?
    				DEFAULT_PROPERTY_SOURCE_FACTORY : BeanUtils.instantiateClass(factoryClass));
    
    		for (String location : locations) { 
    			try { 
    				String resolvedLocation = this.environment.resolveRequiredPlaceholders(location);
    				Resource resource = this.resourceLoader.getResource(resolvedLocation);
    				addPropertySource(factory.createPropertySource(name, new EncodedResource(resource, encoding)));
    			}
    			catch (IllegalArgumentException | FileNotFoundException | UnknownHostException ex) { 
    				// Placeholders not resolvable or resource not found when trying to open it
    				if (ignoreResourceNotFound) { 
    					if (logger.isInfoEnabled()) { 
    						logger.info("Properties location [" + location + "] not resolvable: " + ex.getMessage());
    					}
    				}
    				else { 
    					throw ex;
    				}
    			}
    		}
    	}

private void addPropertySource(PropertySource<?> propertySource) { 
    		String name = propertySource.getName();
    		MutablePropertySources propertySources = ((ConfigurableEnvironment) this.environment).getPropertySources();
    
    		if (this.propertySourceNames.contains(name)) { 
    			// We've already added a version, we need to extend it
    			PropertySource<?> existing = propertySources.get(name);
    			if (existing != null) { 
    				PropertySource<?> newSource = (propertySource instanceof ResourcePropertySource ?
    						((ResourcePropertySource) propertySource).withResourceName() : propertySource);
    				if (existing instanceof CompositePropertySource) { 
    					((CompositePropertySource) existing).addFirstPropertySource(newSource);
    				}
    				else { 
    					if (existing instanceof ResourcePropertySource) { 
    						existing = ((ResourcePropertySource) existing).withResourceName();
    					}
    					CompositePropertySource composite = new CompositePropertySource(name);
    					composite.addPropertySource(newSource);
    					composite.addPropertySource(existing);
    					propertySources.replace(name, composite);
    				}
    				return;
    			}
    		}
    
    		if (this.propertySourceNames.isEmpty()) { 
    			propertySources.addLast(propertySource);
    		}
    		else { 
    			String firstProcessed = this.propertySourceNames.get(this.propertySourceNames.size() - 1);
    			propertySources.addBefore(firstProcessed, propertySource);
    		}
    		this.propertySourceNames.add(name);
    	}

老规矩打个断点看下：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTIzMTkyOA_size_16_color_FFFFFF_t_70 8]  
`user.properties` 我们自己定义的配置文件已经通过 `@PropertySource` 注解读取到spring中。

#### (3) this.componentScanParser.parse ####

接下来就是处理 `@ComponentScan` 或者 `ComponentScans` 注解, 直接断点看下：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTIzMTkyOA_size_16_color_FFFFFF_t_70 9]  
我们的测试类里注明的路径就是’fengge.dao’，可以看到这个路径下的bean都已经被扫描到。扫描到后就开始了为这些bean生成对应的BeanDefinition，最后每个BeanDefinition作为参数又回头调用parse。怎么扫描到的？通过 `this.componentScanParser.parse` ：

public Set<BeanDefinitionHolder> parse(AnnotationAttributes componentScan, final String declaringClass) { 
    		ClassPathBeanDefinitionScanner scanner = new ClassPathBeanDefinitionScanner(this.registry,
    				componentScan.getBoolean("useDefaultFilters"), this.environment, this.resourceLoader);
    
    		Class<? extends BeanNameGenerator> generatorClass = componentScan.getClass("nameGenerator");
    		boolean useInheritedGenerator = (BeanNameGenerator.class == generatorClass);
    		scanner.setBeanNameGenerator(useInheritedGenerator ? this.beanNameGenerator :
    				BeanUtils.instantiateClass(generatorClass));
    
    		ScopedProxyMode scopedProxyMode = componentScan.getEnum("scopedProxy");
    		if (scopedProxyMode != ScopedProxyMode.DEFAULT) { 
    			scanner.setScopedProxyMode(scopedProxyMode);
    		}
    		else { 
    			Class<? extends ScopeMetadataResolver> resolverClass = componentScan.getClass("scopeResolver");
    			scanner.setScopeMetadataResolver(BeanUtils.instantiateClass(resolverClass));
    		}
    
    		scanner.setResourcePattern(componentScan.getString("resourcePattern"));
    
    		for (AnnotationAttributes filter : componentScan.getAnnotationArray("includeFilters")) { 
    			for (TypeFilter typeFilter : typeFiltersFor(filter)) { 
    				scanner.addIncludeFilter(typeFilter);
    			}
    		}
    		for (AnnotationAttributes filter : componentScan.getAnnotationArray("excludeFilters")) { 
    			for (TypeFilter typeFilter : typeFiltersFor(filter)) { 
    				scanner.addExcludeFilter(typeFilter);
    			}
    		}
    
    		boolean lazyInit = componentScan.getBoolean("lazyInit");
    		if (lazyInit) { 
    			scanner.getBeanDefinitionDefaults().setLazyInit(true);
    		}
    
    		Set<String> basePackages = new LinkedHashSet<>();
    		String[] basePackagesArray = componentScan.getStringArray("basePackages");
    		for (String pkg : basePackagesArray) { 
    			String[] tokenized = StringUtils.tokenizeToStringArray(this.environment.resolvePlaceholders(pkg),
    					ConfigurableApplicationContext.CONFIG_LOCATION_DELIMITERS);
    			Collections.addAll(basePackages, tokenized);
    		}
    		for (Class<?> clazz : componentScan.getClassArray("basePackageClasses")) { 
    			basePackages.add(ClassUtils.getPackageName(clazz));
    		}
    		if (basePackages.isEmpty()) { 
    			basePackages.add(ClassUtils.getPackageName(declaringClass));
    		}
    
    		scanner.addExcludeFilter(new AbstractTypeHierarchyTraversingFilter(false, false) { 
    			@Override
    			protected boolean matchClassName(String className) { 
    				return declaringClass.equals(className);
    			}
    		});
    		return scanner.doScan(StringUtils.toStringArray(basePackages));
    	}

protected Set<BeanDefinitionHolder> doScan(String... basePackages) { 
    		Assert.notEmpty(basePackages, "At least one base package must be specified");
    		Set<BeanDefinitionHolder> beanDefinitions = new LinkedHashSet<>();
    		for (String basePackage : basePackages) { 
    			Set<BeanDefinition> candidates = findCandidateComponents(basePackage);
    			for (BeanDefinition candidate : candidates) { 
    				ScopeMetadata scopeMetadata = this.scopeMetadataResolver.resolveScopeMetadata(candidate);
    				candidate.setScope(scopeMetadata.getScopeName());
    				String beanName = this.beanNameGenerator.generateBeanName(candidate, this.registry);
    				if (candidate instanceof AbstractBeanDefinition) { 
    					postProcessBeanDefinition((AbstractBeanDefinition) candidate, beanName);
    				}
    				if (candidate instanceof AnnotatedBeanDefinition) { 
    					AnnotationConfigUtils.processCommonDefinitionAnnotations((AnnotatedBeanDefinition) candidate);
    				}
    				if (checkCandidate(beanName, candidate)) { 
    					BeanDefinitionHolder definitionHolder = new BeanDefinitionHolder(candidate, beanName);
    					definitionHolder =
    							AnnotationConfigUtils.applyScopedProxyMode(scopeMetadata, definitionHolder, this.registry);
    					beanDefinitions.add(definitionHolder);
    					registerBeanDefinition(definitionHolder, this.registry);
    				}
    			}
    		}
    		return beanDefinitions;
    	}

`doScan` 方法中会根据指定的 basePackage 找到所有的候选bean：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTIzMTkyOA_size_16_color_FFFFFF_t_70 10]  
`findCandidateComponents` 方法可以跟进去看下：

public Set<BeanDefinition> findCandidateComponents(String basePackage) { 
        if (this.componentsIndex != null && indexSupportsIncludeFilters()) { 
            return addCandidateComponentsFromIndex(this.componentsIndex, basePackage);
        }
        else { 
            return scanCandidateComponents(basePackage);
        }
    }

private Set<BeanDefinition> scanCandidateComponents(String basePackage) { 
            Set<BeanDefinition> candidates = new LinkedHashSet<>();
            try { 
                String packageSearchPath = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX +
                        resolveBasePackage(basePackage) + '/' + this.resourcePattern;
                Resource[] resources = getResourcePatternResolver().getResources(packageSearchPath);
                boolean traceEnabled = logger.isTraceEnabled();
                boolean debugEnabled = logger.isDebugEnabled();
                for (Resource resource : resources) { 
                    if (traceEnabled) { 
                        logger.trace("Scanning " + resource);
                    }
                    if (resource.isReadable()) { 
                        try { 
                            MetadataReader metadataReader = getMetadataReaderFactory().getMetadataReader(resource);
                            if (isCandidateComponent(metadataReader)) { 
                                ScannedGenericBeanDefinition sbd = new ScannedGenericBeanDefinition(metadataReader);
                                sbd.setResource(resource);
                                sbd.setSource(resource);
                                if (isCandidateComponent(sbd)) { 
                                    if (debugEnabled) { 
                                        logger.debug("Identified candidate component class: " + resource);
                                    }
                                    candidates.add(sbd);
                                }
                                else { 
                                    if (debugEnabled) { 
                                        logger.debug("Ignored because not a concrete top-level class: " + resource);
                                    }
                                }
                            }
                            else { 
                                if (traceEnabled) { 
                                    logger.trace("Ignored because not matching any filter: " + resource);
                                }
                            }
                        }
                        catch (Throwable ex) { 
                            throw new BeanDefinitionStoreException(
                                    "Failed to read candidate component class: " + resource, ex);
                        }
                    }
                    else { 
                        if (traceEnabled) { 
                            logger.trace("Ignored because not readable: " + resource);
                        }
                    }
                }
            }
            catch (IOException ex) { 
                throw new BeanDefinitionStoreException("I/O failure during classpath scanning", ex);
            }
            return candidates;
        }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTIzMTkyOA_size_16_color_FFFFFF_t_70 11]  
当然，`getResourcePatternResolver().getResources(packageSearchPath);` 根据路径去解析resource的过程参考：[@ComponentScan配置老扫描不到Bean，这下彻底搞懂][ComponentScan_Bean]

#### (4) processImports ####

![在这里插入图片描述][20210619205153762.png]  
处理Import注解，可以通过Import导入相应的类，我们在测试类中添加的是 @Import(\{A.class, B.class\}) ，即导入的是A、B 两个类，先看它的第三个传参：

private Set<SourceClass> getImports(SourceClass sourceClass) throws IOException { 
    		Set<SourceClass> imports = new LinkedHashSet<>();
    		Set<SourceClass> visited = new LinkedHashSet<>();
    		collectImports(sourceClass, imports, visited);
    		return imports;
    	}

private void collectImports(SourceClass sourceClass, Set<SourceClass> imports, Set<SourceClass> visited)
    			throws IOException { 
    
    		if (visited.add(sourceClass)) { 
    			for (SourceClass annotation : sourceClass.getAnnotations()) { 
    				String annName = annotation.getMetadata().getClassName();
    				if (!annName.startsWith("java") && !annName.equals(Import.class.getName())) { 
    					collectImports(annotation, imports, visited);
    				}
    			}
    			imports.addAll(sourceClass.getAnnotationAttributes(Import.class.getName(), "value"));
    		}
    	}

![在这里插入图片描述][20210619210338460.png]上面的方法，就是看 sourceClass(就是我们的测试配置类aopOneConfig)是否包含 @Import注解，且是递归实现，即看这个注解包含的注解是否也有 @Import注解。若有则把@Import注解注入的bean放到一个Set集合里面。这里可以看到这里通过 @Import注解 注入了三个bean，即A、B、AspectJAutoProxyRegistrar（@EnableAspectJAutoProxy 注解中包含的@Import注解导入的）。

private void processImports(ConfigurationClass configClass, SourceClass currentSourceClass,
    			Collection<SourceClass> importCandidates, boolean checkForCircularImports) { 
    
    		if (importCandidates.isEmpty()) { 
    			return;
    		}
    
    		if (checkForCircularImports && isChainedImportOnStack(configClass)) { 
    			this.problemReporter.error(new CircularImportProblem(configClass, this.importStack));
    		}
    		else { 
    			this.importStack.push(configClass);
    			try { 
    				for (SourceClass candidate : importCandidates) { 
    					if (candidate.isAssignable(ImportSelector.class)) { 
    						// Candidate class is an ImportSelector -> delegate to it to determine imports
    						Class<?> candidateClass = candidate.loadClass();
    						ImportSelector selector = BeanUtils.instantiateClass(candidateClass, ImportSelector.class);
    						ParserStrategyUtils.invokeAwareMethods(
    								selector, this.environment, this.resourceLoader, this.registry);
    						if (selector instanceof DeferredImportSelector) { 
    							this.deferredImportSelectorHandler.handle(
    									configClass, (DeferredImportSelector) selector);
    						}
    						else { 
    							String[] importClassNames = selector.selectImports(currentSourceClass.getMetadata());
    							Collection<SourceClass> importSourceClasses = asSourceClasses(importClassNames);
    							processImports(configClass, currentSourceClass, importSourceClasses, false);
    						}
    					}
    					else if (candidate.isAssignable(ImportBeanDefinitionRegistrar.class)) { 
    						// Candidate class is an ImportBeanDefinitionRegistrar ->
    						// delegate to it to register additional bean definitions
    						Class<?> candidateClass = candidate.loadClass();
    						ImportBeanDefinitionRegistrar registrar =
    								BeanUtils.instantiateClass(candidateClass, ImportBeanDefinitionRegistrar.class);
    						ParserStrategyUtils.invokeAwareMethods(
    								registrar, this.environment, this.resourceLoader, this.registry);
    						configClass.addImportBeanDefinitionRegistrar(registrar, currentSourceClass.getMetadata());
    					}
    					else { 
    						// Candidate class not an ImportSelector or ImportBeanDefinitionRegistrar ->
    						// process it as an @Configuration class
    						this.importStack.registerImport(
    								currentSourceClass.getMetadata(), candidate.getMetadata().getClassName());
    						processConfigurationClass(candidate.asConfigClass(configClass));
    					}
    				}
    			}
    			catch (BeanDefinitionStoreException ex) { 
    				throw ex;
    			}
    			catch (Throwable ex) { 
    				throw new BeanDefinitionStoreException(
    						"Failed to process import candidates for configuration class [" +
    						configClass.getMetadata().getClassName() + "]", ex);
    			}
    			finally { 
    				this.importStack.pop();
    			}
    		}
    	}

上面就是对拿到所有 @Import注解 导入的类后进行处理，生成相应的 BeanDefinition 并注册到容器。

#### (5) processImports ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTIzMTkyOA_size_16_color_FFFFFF_t_70 12]

public void addImportedResource(String importedResource, Class<? extends BeanDefinitionReader> readerClass) { 
    		this.importedResources.put(importedResource, readerClass);
    	}

#### (6) retrieveBeanMethodMetadata ####

接着处理@Bean注解：

// Process individual @Bean methods
    		Set<MethodMetadata> beanMethods = retrieveBeanMethodMetadata(sourceClass);
    		for (MethodMetadata methodMetadata : beanMethods) { 
    			configClass.addBeanMethod(new BeanMethod(methodMetadata, configClass));
    		}

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTIzMTkyOA_size_16_color_FFFFFF_t_70 13]  
![在这里插入图片描述][20210619214833874.png]  
上面可以看到我们测试类里面的两个@Bean注解的bean已经被找到。怎么解析找到的呢？  
通过retrieveBeanMethodMetadata（）方法：

private Set<MethodMetadata> retrieveBeanMethodMetadata(SourceClass sourceClass) { 
    		AnnotationMetadata original = sourceClass.getMetadata();
    		Set<MethodMetadata> beanMethods = original.getAnnotatedMethods(Bean.class.getName());
    		if (beanMethods.size() > 1 && original instanceof StandardAnnotationMetadata) { 
    			// Try reading the class file via ASM for deterministic declaration order...
    			// Unfortunately, the JVM's standard reflection returns methods in arbitrary
    			// order, even between different runs of the same application on the same JVM.
    			try { 
    				AnnotationMetadata asm =
    						this.metadataReaderFactory.getMetadataReader(original.getClassName()).getAnnotationMetadata();
    				Set<MethodMetadata> asmMethods = asm.getAnnotatedMethods(Bean.class.getName());
    				if (asmMethods.size() >= beanMethods.size()) { 
    					Set<MethodMetadata> selectedMethods = new LinkedHashSet<>(asmMethods.size());
    					for (MethodMetadata asmMethod : asmMethods) { 
    						for (MethodMetadata beanMethod : beanMethods) { 
    							if (beanMethod.getMethodName().equals(asmMethod.getMethodName())) { 
    								selectedMethods.add(beanMethod);
    								break;
    							}
    						}
    					}
    					if (selectedMethods.size() == beanMethods.size()) { 
    						// All reflection-detected methods found in ASM method set -> proceed
    						beanMethods = selectedMethods;
    					}
    				}
    			}
    			catch (IOException ex) { 
    				logger.debug("Failed to read class file via ASM for determining @Bean method order", ex);
    				// No worries, let's continue with the reflection metadata we started with...
    			}
    		}
    		return beanMethods;
    	}

ok，到这里已经@Configuration 和 @Bean 注解修饰的bean怎么被扫描解析注入spring的过程已经说差不多了。当然这里只是创建它们的BeanDefinition，后面还有它们的实例化初始化等流程。

#### （7）processInterfaces ####

虽然@Configuration 和 @Bean 注解修饰的bean怎么被扫描解析注入spring的过程已经说差不多了，但是为了完整性，接着把 `doProcessConfigurationClass` 这个方法的流程说完。  
`processInterfaces` 是来处理 configClass 实现的接口的，我们的测试代码里面让 AopOneConfig实现了 我们自定义的DemoInterface接口：

public interface DemoInterface { 
        String selectData();
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTIzMTkyOA_size_16_color_FFFFFF_t_70 14]

#### （7）getSuperClass ####

处理父类。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTIzMTkyOA_size_16_color_FFFFFF_t_70 15]

[Sping]: https://blog.csdn.net/weixin_41231928/article/details/117454388?spm=1001.2014.3001.5501
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[20210617203930307.png]: /images/20221005/e38084b7c18647cc9010b5e853ef12e8.png
[20210617203939670.png]: /images/20221005/9aca9c625a784e5880fee7390955e1c3.png
[20210617204129315.png]: /images/20221005/c819db2ba8fc451f9ae863ca288220ee.png
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[application.yml _ application.properties]: https://blog.csdn.net/weixin_41231928/article/details/118056736?spm=1001.2014.3001.5501
[ComponentScan_Bean]: https://blog.csdn.net/weixin_41231928/article/details/116504236?spm=1001.2014.3001.5501
[spring_bean]: https://blog.csdn.net/weixin_41231928/article/details/116664597?spm=1001.2014.3001.5501
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