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//java

//将以逗号分割的字符串转换成List类型 

String ids= "1,2,3,4,5,6"; 

ListidsList = Arrays.asList(ids.split(",")).stream().map(s -> Long.parseLong(s.trim())).collect(Collectors.toList()); 

//List转换成String两种方式 

String idsString = StringUtils.join(idsList, ","); 

StringUtils.strip(idsList.toString(),"[]");