org.springframework.boot.context.properties.source.ConfigurationPropertySources#from ( )源码实例Demo

@Test
public void loadYaml() throws Exception {
	YamlPropertySourceLoader yamlLoader = new YamlPropertySourceLoader();
	List<PropertySource<?>> yaml = yamlLoader.load("application",
			new ClassPathResource("test-application.yml", getClass()));
	Binder binder = new Binder(ConfigurationPropertySources.from(yaml));
	ApplicationProperties properties = binder.bind("releasenotes", ApplicationProperties.class).get();
	Github github = properties.getGithub();
	assertThat(github.getUsername()).isEqualTo("testuser");
	assertThat(github.getPassword()).isEqualTo("testpass");
	assertThat(github.getOrganization()).isEqualTo("testorg");
	assertThat(github.getRepository()).isEqualTo("testrepo");
	List<Section> sections = properties.getSections();
	assertThat(sections.get(0).getTitle()).isEqualTo("New Features");
	assertThat(sections.get(0).getEmoji()).isEqualTo(":star:");
	assertThat(sections.get(0).getLabels()).containsExactly("enhancement");
}
 

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);

}
 

public static JasyptEncryptorConfigurationProperties bindConfigProps(ConfigurableEnvironment environment) {
    final BindHandler handler = new IgnoreErrorsBindHandler(BindHandler.DEFAULT);
    final MutablePropertySources propertySources = environment.getPropertySources();
    final Binder binder = new Binder(ConfigurationPropertySources.from(propertySources),
            new PropertySourcesPlaceholdersResolver(propertySources),
            ApplicationConversionService.getSharedInstance());
    final JasyptEncryptorConfigurationProperties config = new JasyptEncryptorConfigurationProperties();

    final ResolvableType type = ResolvableType.forClass(JasyptEncryptorConfigurationProperties.class);
    final Annotation annotation = AnnotationUtils.findAnnotation(JasyptEncryptorConfigurationProperties.class,
            ConfigurationProperties.class);
    final Annotation[] annotations = new Annotation[]{annotation};
    final Bindable<?> target = Bindable.of(type).withExistingValue(config).withAnnotations(annotations);

    binder.bind("jasypt.encryptor", target, handler);
    return config;
}
 

public FunctionalConfigurationPropertiesBinder(ConfigurableApplicationContext context) {
	PropertySources propertySources = new FunctionalPropertySourcesDeducer(context).getPropertySources();
	this.context = context;
	this.binder = new Binder(ConfigurationPropertySources.from(propertySources),
       				new PropertySourcesPlaceholdersResolver(propertySources),
       				null,
			(registry) -> context.getBeanFactory().copyRegisteredEditorsTo(registry));
}
 

private Iterable<ConfigurationPropertySource> getConfigurationPropertySources() {
  return ConfigurationPropertySources.from(this.propertySources);
}
 

private static Iterable<ConfigurationPropertySource> getConfigurationPropertySources(PropertySources propertySources) {
    return ConfigurationPropertySources.from(propertySources);
}