[Turn] JAVA traverses all files in a folder (recursive and non-recursive calls)

Original address: http://www.cnblogs.com/azhqiang/p/4596793.html

JAVA traverses all files in a folder (recursive call and non-recursive call)

JAVA traverses all files in a folder (recursive call and non-recursive call) call)

1. Method calls without recursion

public void traverseFolder1(String path) {
        int fileNum = 0, folderNum = 0;
        File file = new File(path);
        if (file.exists()) {
            LinkedList<File> list = new LinkedList<File>();
            File[] files = file.listFiles();
            for (File file2 : files) {
                if (file2.isDirectory()) {
                    System.out.println("Folder:" + file2.getAbsolutePath());
                    list.add(file2);
                    fileNum ++;
                } else {
                    System.out.println("文件:" + file2.getAbsolutePath());
                    folderNum++;
                }
            }
            File temp_file;
            while (!list.isEmpty()) {
                temp_file = list.removeFirst();
                files = temp_file.listFiles();
                for (File file2 : files) {
                    if (file2.isDirectory()) {
                        System.out.println("Folder:" + file2.getAbsolutePath());
                        list.add(file2);
                        fileNum ++;
                    } else {
                        System.out.println("文件:" + file2.getAbsolutePath());
                        folderNum++;
                    }
                }
            }
        } else {
            System.out.println("File does not exist!");
        }
        System.out.println("Total folder:" + folderNum + ",Total file:" + fileNum);

    }

2. Use recursive method calls

public void traverseFolder2(String path) {

        File file = new File(path);
        if (file.exists()) {
            File[] files = file.listFiles();
            if (files.length == 0) {
                System.out.println("Folder is empty!");
                return;
            } else {
                for (File file2 : files) {
                    if (file2.isDirectory()) {
                        System.out.println("Folder:" + file2.getAbsolutePath());
                        traverseFolder2(file2.getAbsolutePath());
                    } else {
                        System.out.println("文件:" + file2.getAbsolutePath());
                    }
                }
            }
        } else {
            System.out.println("File does not exist!");
        }
    }

3. Determine the extension

public static List<File> getFileList(String strPath) {
        File dir = new File(strPath);
        File[] files = dir.listFiles(); // All files in the file directory are placed in an array
        if (files != null) {
            for (int i = 0; i < files.length; i++) {
                String fileName = files[i].getName();
                if (files[i].isDirectory()) { // Determine whether it is a file or a folder
                    getFileList(files[i].getAbsolutePath()); // Get the absolute path of the file
                } else if (fileName.endsWith("avi")) { // Determine if the file name ends with .avi
                    String strFileName = files[i].getAbsolutePath();
                    System.out.println("---" + strFileName);
                    filelist.add(files[i]);
                } else {
                    continue;
                }
            }

        }
        return filelist;
    }