Java8 List 与以逗号分割String类型相互转换

//java8特性
String ids= "1,2,3,4,5,6"; 
List<Long> idList = Arrays.asList(ids.split(",")).stream().map(s -> Long.parseLong(s.trim())).collect(Collectors.toList());


//将以逗号分割的字符串转换成List<Long>类型
String ids = StringUtils.join(idsList, ",")
StringUtils.strip(list.toString(),"[]");