org.springframework.boot.env.PropertySourceLoader#load ( )源码实例Demo

@PostConstruct
public void printConfig() throws UnSupportConfigFileSuffixException {
    LOGGER.info("Start to print config");
    addPropertiesFile();
    ResourceLoader resourceLoader = new DefaultResourceLoader();
    LOGGER.info("Prepared to print config in file: {}", propertiesFiles);

    for (String fileName : propertiesFiles) {
        LOGGER.info("======================== Config in {} ========================", fileName);
        PropertySourceLoader propertySourceLoader = getPropertySourceLoader(fileName);
        Resource resource = resourceLoader.getResource(fileName);
        try {
            List<PropertySource<?>> propertySources = propertySourceLoader.load(fileName, resource);
            for (PropertySource p : propertySources) {
                Map<String, Object> map = (Map<String, Object>) p.getSource();
                for (String key : map.keySet()) {
                    LOGGER.info("Name: [{}]=[{}]", key, map.get(key));
                }
            }
        } catch (IOException e) {
            LOGGER.info("Failed to open file: {}, caused by: {}, it does not matter", fileName, e.getMessage());
        }
        LOGGER.info("=======================================================================================\n");
    }
    LOGGER.info("Succeed to print all configs");
}
 

@Override
public PropertySource<?> createPropertySource(String name, EncodedResource resource) throws IOException {
    PropertySource<?> propSource = null;
    String propName = name;
    if (StringUtils.isEmpty(propName)) {
        propName = getNameForResource(resource.getResource());
    }
    if (resource.getResource().exists()) {
        String fileName = resource.getResource().getFilename();
        for (PropertySourceLoader loader : loaders) {
            if (checkFileType(fileName, loader.getFileExtensions())) {
                List<PropertySource<?>> propertySources = loader.load(propName, resource.getResource());
                if (!propertySources.isEmpty()) {
                    propSource = propertySources.get(0);
                }
            }
        }
    } else {
        throw new FileNotFoundException(propName + "对应文件'" + resource.getResource().getFilename() + "'不存在");
    }
    return propSource;
}
 

@Override
public PropertySource<?> createPropertySource(String name, EncodedResource resource) throws IOException {
    PropertySource<?> propSource = null;
    String propName = name;
    if (StringUtils.isEmpty(propName)) {
        propName = getNameForResource(resource.getResource());
    }
    if (resource.getResource().exists()) {
        String fileName = resource.getResource().getFilename();
        for (PropertySourceLoader loader : loaders) {
            if (checkFileType(fileName, loader.getFileExtensions())) {
                List<PropertySource<?>> propertySources = loader.load(propName, resource.getResource());
                if (!propertySources.isEmpty()) {
                    propSource = propertySources.get(0);
                }
            }
        }
    } else {
        throw new FileNotFoundException(propName + "对应文件'" + resource.getResource().getFilename() + "'不存在");
    }
    return propSource;
}
 

void load(String location, PropertySourceLoader loader) {
    try {
        Resource resource = resourceLoader.getResource(location);
        if (!resource.exists()) {
            return;
        }
        String propertyResourceName = "flowableDefaultConfig: [" + location + "]";

        List<PropertySource<?>> propertySources = loader.load(propertyResourceName, resource);
        if (propertySources == null) {
            return;
        }
        propertySources.forEach(source -> environment.getPropertySources().addLast(source));
    } catch (Exception ex) {
        throw new IllegalStateException("Failed to load property "
            + "source from location '" + location + "'", ex);
    }
}
 

@SneakyThrows
private List<PropertySource<?>> load(PropertySourceLoader loader, String sourceName, Resource resource) {
    return loader.load(sourceName, resource);
}