JAVA-根据文件名排序

妖狐艹你老母 2022-05-17 01:17 291阅读 0赞

JAVA中对文件名进行排序

/** * @author wzx * @time 2018/8/4 */
    public class FileSortTest { 
    
        public static final String PATH = "D:\\tmp\\";
    
        public static void main(String[] args) {
            List<File> files = new ArrayList<File>();
            files.add(new File(PATH + "test4.jpg"));
            files.add(new File(PATH + "test1.jpg"));
            files.add(new File(PATH + "test5.jpg"));
            files.add(new File(PATH + "test2.jpg"));
            files.add(new File(PATH + "test6.jpg"));
            files.add(new File(PATH + "test3.jpg"));
            files = sortFileByName(files, "desc");
            for (File file : files) {
                System.out.println(file.getName());
            }
        }
    
        /** * * @param files * @param orderStr 排序:asc,des,不区分大小写 * @return */
        public static List<File> sortFileByName(List<File> files, final String orderStr) {
            if (!orderStr.equalsIgnoreCase("asc") && orderStr.equalsIgnoreCase("desc")) {
                return files;
            }
            File[] files1 = files.toArray(new File[0]);
            Arrays.sort(files1, new Comparator<File>() {
                public int compare(File o1, File o2) {
                    int n1 = extractNumber(o1.getName());
                    int n2 = extractNumber(o2.getName());
                    if(orderStr == null || orderStr.length() < 1 || orderStr.equalsIgnoreCase("asc")) {
                        return n1 - n2;
                    } else {
                        //降序
                        return n2 - n1;
                    }
                }
            });
            return new ArrayList<File>(Arrays.asList(files1));
        }
    
        private static int extractNumber(String name) {
            int i;
            try {
                String number = name.replaceAll("[^\\d]", "");
                i = Integer.parseInt(number);
            } catch (Exception e) {
                i = 0;
            }
            return i;
        }
    }

输出结果：

test6.jpg
    test5.jpg
    test4.jpg
    test3.jpg
    test2.jpg
    test1.jpg