public Set<String> keys(String pattern){
		Set<String> keys = JedisProviderFactory.getMultiKeyCommands(groupName).keys(pattern);
		return keys;
	}
public Set < String > keys ( String pattern ) { Set < String > keys = JedisProviderFactory . getMultiKeyCommands ( groupName ) . keys ( pattern ) ; return keys ; }
查找所有符合给定模式 pattern 的 key
@param pattern
@return