不用if判断去掉末尾逗号，直接拼接后截取
StringBuffer sb = new StringBuffer(); for (String str: list) { sb.append(str).append(","); } String keywordStr = sb.deleteCharAt(sb.length() - 1).toString();
用逗号分隔拼接字符串的方法
原文：https://www.cnblogs.com/jaycee/p/13293238.html
