Limy-离人怎挽

//集合--字符串--转换 List<Long> fileIds = Lists.newArrayList(); //list转成用逗号隔开的字符串 String fileids = StringUtils.join(fileIds.toArray(), ","); //按照逗号分割转成list List<String> fileIds= Arrays.asList(fileids.split(",")); ...

List<Long> fileIds = Lists.newArrayList(); fileIds.add(Long.valueOf("1338047107477188609")); fileIds.add(Long.valueOf("1338047107489771522")); String fileids = StringUtils.join(fileIds.toArray(), ","); System.out.println(fileids);//133804710747718860

String str = "1, 2, 3"; String[] strAry = str.split(","); int[] intAry = new int[strAry.length]; System.out.println(intAry[0]);

HashMap<String, Object> hashMap = new HashMap<>(); JSONObject jsonObject = JSONObject.parseObject(userMapString); int total = (int) jsonObject.get("total"); JSONA...