String ids= "1,2,3,4,5,6";
List<Long> listIds = Arrays.asList(ids.split(",")).stream().map(s -> Long.parseLong(s.trim())).collect(Collectors.toList());
System.out.println(Arrays.toString(listIds .toArray()));//[1,2,3,3,4,5,6]
//You can use the Lambda functions of Java 8 to achieve this without looping
//来自：http://*.com/questions/19946980/convert-string-to-listlong