springboot如何通过@PropertySource加载自定义yml文件
目录
- @PropertySource加载自定义yml文件
- @PropertySource注解对于yml的支持
@PropertySource加载自定义yml文件
使用@PropertySource默认加载的是.xml或者 .properties文件,因为在注解源码默认使用的是DefaultPropertySourceFactory实现处理文件内容,spring使用ResourcePropertySource从Resource构建Properties传给Spring。
系统的应用,比如加载自定义的文件,将配置文件内容存储在内存,如下:
那么加载一个自定义的.yml文件,就需要自定义实现ResourcePropertySource来处理yml文件的类
public class YamlPropertySourceFactory implements PropertySourceFactory { @Override public PropertySource<?> createPropertySource(String name, EncodedResource resource) throws IOException { Properties propertiesFromYaml = loadYamlIntoProperties(resource); String sourceName = name != null ? name : resource.getResource().getFilename(); return new PropertiesPropertySource(sourceName, propertiesFromYaml); } private Properties loadYamlIntoProperties(EncodedResource resource) throws FileNotFoundException { try { YamlPropertiesFactoryBean factory = new YamlPropertiesFactoryBean(); factory.setResources(resource.getResource()); factory.afterPropertiesSet(); return factory.getObject(); } catch (IllegalStateException e) { // for ignoreResourceNotFound Throwable cause = e.getCause(); if (cause instanceof FileNotFoundException) throw (FileNotFoundException) e.getCause(); throw e; } } }
@PropertySource注解对于yml的支持
@PropertySource只对properties文件可以进行加载,但对于yml或者yaml不能支持。
追寻源码。
public class DefaultPropertySourceFactory implements PropertySourceFactory { public DefaultPropertySourceFactory() { } public PropertySource<?> createPropertySource(String name, EncodedResource resource) throws IOException { return name != null ? new ResourcePropertySource(name, resource) : new ResourcePropertySource(resource); } }
我们只需要继承DefaultPropertySourceFactory类并修改就可以了。
public class YamlConfigFactory extends DefaultPropertySourceFactory { @Override public PropertySource<?> createPropertySource(String name, EncodedResource resource) throws IOException { String sourceName = name != null ? name : resource.getResource().getFilename(); if (!resource.getResource().exists()) { return new PropertiesPropertySource(sourceName, new Properties()); } else if (sourceName.endsWith(".yml") || sourceName.endsWith(".yaml")) { Properties propertiesFromYaml = loadYml(resource); return new PropertiesPropertySource(sourceName, propertiesFromYaml); } else { return super.createPropertySource(name, resource); } } private Properties loadYml(EncodedResource resource) throws IOException { YamlPropertiesFactoryBean factory = new YamlPropertiesFactoryBean(); factory.setResources(resource.getResource()); factory.afterPropertiesSet(); return factory.getObject(); } }
@PropertySource(value = {"classpath:dog.yml"},factory = YamlConfigFactory.class) @Component @ConfigurationProperties(prefix = "dog") public class Dog { private String name ; private String age ;
以上为个人经验,希望能给大家一个参考,也希望大家多多支持我们。
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