@Override
public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory)  {
	final BindResult<SpringDocConfigProperties> result = Binder.get(environment)
			.bind(SPRINGDOC_PREFIX, SpringDocConfigProperties.class);
	if (result.isBound()) {
		SpringDocConfigProperties springDocGroupConfig = result.get();
		List<GroupedOpenApi> groupedOpenApis = springDocGroupConfig.getGroupConfigs().stream()
				.map(elt -> {
					GroupedOpenApi.Builder builder = GroupedOpenApi.builder();
					if (!CollectionUtils.isEmpty(elt.getPackagesToScan()))
						builder.packagesToScan(elt.getPackagesToScan().toArray(new String[0]));
					if (!CollectionUtils.isEmpty(elt.getPathsToMatch()))
						builder.pathsToMatch(elt.getPathsToMatch().toArray(new String[0]));
					return builder.group(elt.getGroup()).build();
				})
				.collect(Collectors.toList());
		groupedOpenApis.forEach(elt -> beanFactory.registerSingleton(elt.getGroup(), elt));
	}
	initBeanFactoryPostProcessor(beanFactory);
}
 

@Override
public ConditionOutcome getMatchOutcome(ConditionContext context, AnnotatedTypeMetadata metadata) {
	String sourceClass = "";
	if (metadata instanceof ClassMetadata) {
		sourceClass = ((ClassMetadata) metadata).getClassName();
	}
	ConditionMessage.Builder message = ConditionMessage.forCondition("OSS", sourceClass);
	Environment environment = context.getEnvironment();
	try {
		BindResult<OSSType> specified = Binder.get(environment).bind("oss.type", OSSType.class);
		if (!specified.isBound()) {
			return ConditionOutcome.match(message.because("automatic OSS type"));
		}
		OSSType required = OSSConfigurations.getType(((AnnotationMetadata) metadata).getClassName());
		if (specified.get() == required) {
			return ConditionOutcome.match(message.because(specified.get() + " OSS type"));
		}
	}
	catch (BindException ex) {
	}
	return ConditionOutcome.noMatch(message.because("unknown OSS type"));
}
 

public static void main(String[] args) {
    ConfigurableApplicationContext context = new SpringApplicationBuilder(BinderBootstrap.class)
            .web(WebApplicationType.NONE) // 非 Web 应用
            .properties("user.city.postCode=0731")
            .run(args);
    ConfigurableEnvironment environment = context.getEnvironment();
    // 从 Environment 中获取 ConfigurationPropertySource 集合
    Iterable<ConfigurationPropertySource> sources = ConfigurationPropertySources.get(environment);
    // 构造 Binder 对象，并使用 ConfigurationPropertySource 集合作为配置源
    Binder binder = new Binder(sources);
    // 构造 ConfigurationPropertyName（Spring Boot 2.0 API）
    ConfigurationPropertyName propertyName = ConfigurationPropertyName.of("user.city.post-code");
    // 构造 Bindable 对象，包装 postCode
    Bindable<String> postCodeBindable = Bindable.of(String.class);
    BindResult<String> result = binder.bind(propertyName, postCodeBindable);
    String postCode = result.get();
    System.out.println("postCode = " + postCode);
    // 关闭上下文
    context.close();
}
 

public static void main(String[] args) throws IOException {
    // application.properties 文件资源 classpath 路径
    String location = "application.properties";
    // 编码化的 Resource 对象（解决乱码问题）
    EncodedResource resource = new EncodedResource(new ClassPathResource(location), "UTF-8");
    // 加载 application.properties 文件，转化为 Properties 对象
    Properties properties = PropertiesLoaderUtils.loadProperties(resource);
    // 创建 Properties 类型的 PropertySource
    PropertiesPropertySource propertySource = new PropertiesPropertySource("map", properties);
    // 转化为 Spring Boot 2 外部化配置源 ConfigurationPropertySource 集合
    Iterable<ConfigurationPropertySource> propertySources = ConfigurationPropertySources.from(propertySource);
    // 创建 Spring Boot 2 Binder 对象（设置 ConversionService ，扩展类型转换能力）
    Binder binder = new Binder(propertySources, null, conversionService());
    // 执行绑定，返回绑定结果
    BindResult<User> bindResult = binder.bind("user", User.class);
    // 获取绑定对象
    User user = bindResult.get();
    // 输出结果
    System.out.println(user);

}
 

@Override
public BindHandler apply(BindHandler bindHandler) {
	BindHandler handler = new AbstractBindHandler(bindHandler) {
		@Override
		public <T> Bindable<T> onStart(ConfigurationPropertyName name,
									Bindable<T> target, BindContext context) {
			final String configName = name.toString();
			if (configName.contains("use") && configName.contains("native") &&
					(configName.contains("encoding") || configName.contains("decoding"))) {
				BindResult<T> result = context.getBinder().bind(name, target);
				if (result.isBound()) {
					if (configName.contains("encoding")) {
						EncodingDecodingBindAdviceHandler.this.encodingSettingProvided = true;
					}
					else {
						EncodingDecodingBindAdviceHandler.this.decodingSettingProvided = true;
					}
					return target.withExistingValue(result.get());
				}
			}
			return bindHandler.onStart(name, target, context);
		}
	};
	return handler;
}
 

@Override
public BindHandler apply(BindHandler bindHandler) {


	BindHandler handler = new AbstractBindHandler(bindHandler) {
		@Override
		public <T> Bindable<T> onStart(ConfigurationPropertyName name,
				Bindable<T> target, BindContext context) {
			ConfigurationPropertyName defaultName = getDefaultName(name);
			if (defaultName != null) {
				BindResult<T> result = context.getBinder().bind(defaultName, target);
				if (result.isBound()) {
					return target.withExistingValue(result.get());
				}
			}
			return bindHandler.onStart(name, target, context);
		}
	};
	return handler;
}
 

public CustomFieldDocument parseCustomFieldDocument(final Map<String, String> currentProperties) throws DetectUserFriendlyException {
    try {
        final ConfigurationPropertySource source = new MapConfigurationPropertySource(currentProperties);
        final Binder objectBinder = new Binder(source);
        final BindResult<CustomFieldDocument> fieldDocumentBinding = objectBinder.bind("detect.custom.fields", CustomFieldDocument.class);
        final CustomFieldDocument fieldDocument = fieldDocumentBinding.orElse(new CustomFieldDocument());
        fieldDocument.getProject().forEach(this::filterEmptyQuotes);
        fieldDocument.getVersion().forEach(this::filterEmptyQuotes);
        return fieldDocument;
    } catch (final Exception e) {
        throw new DetectUserFriendlyException("Unable to parse custom fields.", e, ExitCodeType.FAILURE_CONFIGURATION);
    }
}
 

/**
 * 获取配置
 *
 * @param beanFactory beanFactory
 * @param prefix 前缀
 * @return
 */
public static MangoConfig getMangoConfig(DefaultListableBeanFactory beanFactory, String prefix) {
    MangoConfig config = new MangoConfig();
    Bindable<?> target = Bindable.ofInstance(config);
    PropertySources propertySources = getPropertySources(beanFactory);
    BindHandler bindHandler = getBindHandler();
    BindResult configBindResult = getBinder(propertySources, beanFactory).bind(prefix, target, bindHandler);
    return (MangoConfig) configBindResult.get();
}
 

@Bean
@ConfigurationProperties(prefix = "spring.cloud.stream.kafka.streams.binder")
public KafkaStreamsBinderConfigurationProperties binderConfigurationProperties(
		KafkaProperties kafkaProperties, ConfigurableEnvironment environment,
		BindingServiceProperties properties, ConfigurableApplicationContext context) throws Exception {
	final Map<String, BinderConfiguration> binderConfigurations = getBinderConfigurations(
			properties);
	for (Map.Entry<String, BinderConfiguration> entry : binderConfigurations
			.entrySet()) {
		final BinderConfiguration binderConfiguration = entry.getValue();
		final String binderType = binderConfiguration.getBinderType();
		if (binderType != null && (binderType.equals(KSTREAM_BINDER_TYPE)
				|| binderType.equals(KTABLE_BINDER_TYPE)
				|| binderType.equals(GLOBALKTABLE_BINDER_TYPE))) {
			Map<String, Object> binderProperties = new HashMap<>();
			this.flatten(null, binderConfiguration.getProperties(), binderProperties);
			environment.getPropertySources().addFirst(
					new MapPropertySource(entry.getKey() + "-kafkaStreamsBinderEnv", binderProperties));

			Binder binder = new Binder(ConfigurationPropertySources.get(environment),
					new PropertySourcesPlaceholdersResolver(environment),
					IntegrationUtils.getConversionService(context.getBeanFactory()), null);
			final Constructor<KafkaStreamsBinderConfigurationProperties> kafkaStreamsBinderConfigurationPropertiesConstructor =
					ReflectionUtils.accessibleConstructor(KafkaStreamsBinderConfigurationProperties.class, KafkaProperties.class);
			final KafkaStreamsBinderConfigurationProperties kafkaStreamsBinderConfigurationProperties =
					BeanUtils.instantiateClass(kafkaStreamsBinderConfigurationPropertiesConstructor, kafkaProperties);
			final BindResult<KafkaStreamsBinderConfigurationProperties> bind = binder.bind("spring.cloud.stream.kafka.streams.binder", Bindable.ofInstance(kafkaStreamsBinderConfigurationProperties));
			context.getBeanFactory().registerSingleton(
					entry.getKey() + "-KafkaStreamsBinderConfigurationProperties",
					bind.get());
		}
	}
	return new KafkaStreamsBinderConfigurationProperties(kafkaProperties);
}
 

private Map<String, String> bindProperties() {
	Map<String, String> target;
	BindResult<Map<String, String>> bindResult = Binder.get(this.environment).bind("",
			STRING_STRING_MAP);
	if (bindResult.isBound()) {
		target = bindResult.get();
	}
	else {
		target = new HashMap<>();
	}
	return target;
}
 

public <T> BindResult<T> bind(String prefix, Bindable<T> target) {
	UnboundElementsSourceFilter filter = new UnboundElementsSourceFilter();
	NoUnboundElementsBindHandler handler = new NoUnboundElementsBindHandler(new IgnoreTopLevelConverterNotFoundBindHandler(), filter);
	return binder.bind(prefix, target, handler);
}