1、將list轉化為逗號分割的字符串

String str = String.join(",", list);

String str = StringUtils.json(list.toArray(), ",");　　

2、將逗號分隔的字符串轉換為List

List<String> list = Arrays.asList(str.split(","));

List<String> list = Arrays.asList(StringUtils.split(str, ","));

轉載：https://blog.csdn.net/qq_27327261/article/details/134580779