So erstellen Sie ein Verzeichnis in Java
Verwenden Sie zum Erstellen eines Verzeichnisses in Java den folgenden Code:
1. Standard Java IO Paket -java.io.File
1.1 Create a single directory.
new File("C:\\Directory1").mkdir();
1.2 Create a directory named “Directory2 and all its sub-directories “Sub2” and “Sub-Sub2” together.
new File("C:\\Directory2\\Sub2\\Sub-Sub2").mkdirs()
P.S Both method mkdir()
and mkdirs()
are returning a boolean value to indicate the operation status : true if succeed, false otherwise.
2. Versuchen Sie für JDK 7 das Java NIO-Paket -java.nio.file.Paths
undjava.nio.file.Files
Path path = Paths.get("C:\\Directory1"); Files.createDirectories(path);
1. Java IO Beispiel
Überprüfen Sie in einem klassischen Java IO-Verzeichnisbeispiel, ob ein Verzeichnis vorhanden ist. Wenn nein, erstellen Sie es.
CreateDirectoryExample.java
package com.example.file; import java.io.File; public class CreateDirectoryExample { public static void main(String[] args) { File file = new File("C:\\Directory1"); if (!file.exists()) { if (file.mkdir()) { System.out.println("Directory is created!"); } else { System.out.println("Failed to create directory!"); } } File files = new File("C:\\Directory2\\Sub2\\Sub-Sub2"); if (!files.exists()) { if (files.mkdirs()) { System.out.println("Multiple directories are created!"); } else { System.out.println("Failed to create multiple directories!"); } } } }
2. Java NIO Beispiel
Java NIO-Klassen werden in JDK 7 hinzugefügt.
CreateDirectoryExample.java
package com.example.file; import java.io.IOException; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; public class CreateDirectoryExample { public static void main(String[] args) { Path path = Paths.get("C:\\Directory2\\Sub2\\Sub-Sub2"); //if directory exists? if (!Files.exists(path)) { try { Files.createDirectories(path); } catch (IOException e) { //fail to create directory e.printStackTrace(); } } } }
Wenn ein Verzeichnis nicht erstellt werden kann, werden beispielsweiseIOException
ausgelöst
java.nio.file.AccessDeniedException: /directory-name at sun.nio.fs.UnixException.translateToIOException(UnixException.java:84) at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102) at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107) at sun.nio.fs.UnixFileSystemProvider.createDirectory(UnixFileSystemProvider.java:384) at java.nio.file.Files.createDirectory(Files.java:674) at java.nio.file.Files.createAndCheckIsDirectory(Files.java:781) at java.nio.file.Files.createDirectories(Files.java:767)