1、把yaml读到Map里

2、把Map转换为Properties格式

第二部分转换的核心代码如下

摘自 org.springframework.beans.factory.config.YamlProcessor

private void buildFlattenedMap(Map
    
      result, Map
     
       source, String path) {		for (Entry
      
        entry : source.entrySet()) {			String key = entry.getKey();			if (StringUtils.hasText(path)) {				if (key.startsWith("[")) {					key = path + key;				}				else {					key = path + "." + key;				}			}			Object value = entry.getValue();			if (value instanceof String) {				result.put(key, value);			}			else if (value instanceof Map) {				// Need a compound key				@SuppressWarnings("unchecked")				Map
       
         map = (Map
        
         ) value;				buildFlattenedMap(result, map, key);			}			else if (value instanceof Collection) {				// Need a compound key				@SuppressWarnings("unchecked")				Collection