将逗号分隔的字符串转换为List

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

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

将list转化为逗号分割的字符串

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

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

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