code: public static Properties getAllProperties(String prefix) {
  		if(!inited){
  			load();
  		}
  		if(!merged){
  			mergeWithEnvironment();
  		}
  		
  		Properties properties = new Properties();
  		Set<Entry<Object, Object>> entrySet = allProperties.entrySet();
  		for (Entry<Object, Object> entry : entrySet) {
  			if(StringUtils.isBlank(prefix) || entry.getKey().toString().startsWith(prefix)){				
  				properties.put(entry.getKey(), entry.getValue());
  			}
  		}
  		return properties;
  	}
docs: 获取指定前缀的配置