Java 列出文件夹内容,包括所有子目录和文件
给定文件夹结构:Java 列出文件夹内容,包括所有子目录和文件,java,list,file,Java,List,File,给定文件夹结构: FolderA |_FolderB |_FolderC |_File5 |_FolderD |_File3 |_File4 |_File1 |_File2 我正试图编写一个小应用程序,打印出所有文件夹名,然后是所有文件名。输出应如下所示: FolderA FolderB FolderC FolderD File1 File2 File3 File4 File5 public class FileList { public
FolderA
|_FolderB
|_FolderC
|_File5
|_FolderD
|_File3
|_File4
|_File1
|_File2
我正试图编写一个小应用程序,打印出所有文件夹名,然后是所有文件名。输出应如下所示:
FolderA
FolderB
FolderC
FolderD
File1
File2
File3
File4
File5
public class FileList {
public static void main(String[] args) {
File rootFile = new File("FolderA");
File[] files = rootFile.listFiles();
System.out.println("Root file path: " + rootFile.getAbsolutePath() + "\n");
List<File> folderList = new LinkedList<File>();
List<File> fileList = new LinkedList<File>();
listFilesAndFolders(files, rootFile, folderList, fileList);
extractFromList(folderList);
extractFromList(fileList);
}
private static void listFilesAndFolders(File[] fList, File directoryName, List<File> folderList, List<File> fileList) {
// Get all files from a directory.
if(fList != null) {
for (File file : fList) {
if (file.isFile()) {
fileList.add(file);
} else if (file.isDirectory()) {
folderList.add(file);
}
}
}
}
private static void extractFromList(List<File> list) {
for (File item : list) {
System.out.println(item.getName());
}
}
}
到目前为止,我的尝试如下所示:
FolderA
FolderB
FolderC
FolderD
File1
File2
File3
File4
File5
public class FileList {
public static void main(String[] args) {
File rootFile = new File("FolderA");
File[] files = rootFile.listFiles();
System.out.println("Root file path: " + rootFile.getAbsolutePath() + "\n");
List<File> folderList = new LinkedList<File>();
List<File> fileList = new LinkedList<File>();
listFilesAndFolders(files, rootFile, folderList, fileList);
extractFromList(folderList);
extractFromList(fileList);
}
private static void listFilesAndFolders(File[] fList, File directoryName, List<File> folderList, List<File> fileList) {
// Get all files from a directory.
if(fList != null) {
for (File file : fList) {
if (file.isFile()) {
fileList.add(file);
} else if (file.isDirectory()) {
folderList.add(file);
}
}
}
}
private static void extractFromList(List<File> list) {
for (File item : list) {
System.out.println(item.getName());
}
}
}
如何更改此设置以获取所有子文件和文件夹?这称为遍历目录。Java中有现成的API可用。对于NIO API,实现如下所示:
FolderA
FolderB
FolderC
FolderD
File1
File2
File3
File4
File5
public class FileList {
public static void main(String[] args) {
File rootFile = new File("FolderA");
File[] files = rootFile.listFiles();
System.out.println("Root file path: " + rootFile.getAbsolutePath() + "\n");
List<File> folderList = new LinkedList<File>();
List<File> fileList = new LinkedList<File>();
listFilesAndFolders(files, rootFile, folderList, fileList);
extractFromList(folderList);
extractFromList(fileList);
}
private static void listFilesAndFolders(File[] fList, File directoryName, List<File> folderList, List<File> fileList) {
// Get all files from a directory.
if(fList != null) {
for (File file : fList) {
if (file.isFile()) {
fileList.add(file);
} else if (file.isDirectory()) {
folderList.add(file);
}
}
}
}
private static void extractFromList(List<File> list) {
for (File item : list) {
System.out.println(item.getName());
}
}
}
Files.walk(path.get(“E:\\temp”))
.filter(p->Files.isDirectory(p))
.forEach(System.out::println);
Files.walk(path.get(“E:\\temp”))
.filter(p->Files.isRegularFile(p))
.forEach(System.out::println);
Files.walk(..)
返回目录的内容流。在流上使用可以过滤内容
还有一个.称为遍历目录。Java中有现成的API可用。对于NIO API,实现如下所示:
FolderA
FolderB
FolderC
FolderD
File1
File2
File3
File4
File5
public class FileList {
public static void main(String[] args) {
File rootFile = new File("FolderA");
File[] files = rootFile.listFiles();
System.out.println("Root file path: " + rootFile.getAbsolutePath() + "\n");
List<File> folderList = new LinkedList<File>();
List<File> fileList = new LinkedList<File>();
listFilesAndFolders(files, rootFile, folderList, fileList);
extractFromList(folderList);
extractFromList(fileList);
}
private static void listFilesAndFolders(File[] fList, File directoryName, List<File> folderList, List<File> fileList) {
// Get all files from a directory.
if(fList != null) {
for (File file : fList) {
if (file.isFile()) {
fileList.add(file);
} else if (file.isDirectory()) {
folderList.add(file);
}
}
}
}
private static void extractFromList(List<File> list) {
for (File item : list) {
System.out.println(item.getName());
}
}
}
Files.walk(path.get(“E:\\temp”))
.filter(p->Files.isDirectory(p))
.forEach(System.out::println);
Files.walk(path.get(“E:\\temp”))
.filter(p->Files.isRegularFile(p))
.forEach(System.out::println);
Files.walk(..)
返回目录的内容流。在流上使用可以过滤内容
还有一个。您已经看到了一些关于如何使用的好例子 另一种选择,也可以考虑,是Apache的臭名昭著的。据我观察,它速度更快,甚至更具可定制性 要递归列出文件,请执行以下操作:
FileUtils.listFiles(新文件(\\path)),null,true)
.forEach(System.out::println);
/*
1.“null”可以通过扩展数组更改,比如字符串[]{“jar”,“txt”},以便过滤您想要列出的文件类型;
2.“true”指定要进行递归搜索。也可以使用“false”。
*/
要递归列出目录,请执行以下操作:
FileUtils.listFilesAndDirs(新文件(“\\path”),
新的NotFileFilter(TrueFileFilter.TRUE),
DirectoryFileFilter.DIRECTORY)
.forEach(System.out::println);
您将需要:
公地io
公地io
您已经看到了一些关于如何使用的好例子
另一种选择,也可以考虑,是Apache的臭名昭著的。据我观察,它速度更快,甚至更具可定制性
要递归列出文件,请执行以下操作:
FileUtils.listFiles(新文件(\\path)),null,true)
.forEach(System.out::println);
/*
1.“null”可以通过扩展数组更改,比如字符串[]{“jar”,“txt”},以便过滤您想要列出的文件类型;
2.“true”指定要进行递归搜索。也可以使用“false”。
*/
要递归列出目录,请执行以下操作:
FileUtils.listFilesAndDirs(新文件(“\\path”),
新的NotFileFilter(TrueFileFilter.TRUE),
DirectoryFileFilter.DIRECTORY)
.forEach(System.out::println);
您将需要:
公地io
公地io