Java如何遍歷目錄？

在Java程式中，如何遍歷目錄？

以下範例演示如何通過File類的dir.isDirectory()和dir.list()方法遍歷目錄。

package com.yiibai;

import java.io.File;
import java.io.IOException;

public class TraversingDirectory {
    public static void main(String[] argv) throws Exception {
        System.out.println("The Directory is traversed.");
        String dir = "F:/worksp/javaexamples/java_directories";
        File file = new File(dir);
        visitAllDirsAndFiles(file, 0);
    }

    static void visitAllDirsAndFiles(File file, int indent) throws IOException {
        for (int i = 0; i <= indent; i++) {
            System.out.print('-');
        }
        System.out.println(file.getName());
        if (file.isDirectory()) {
            File[] files = file.listFiles();
            for (int i = 0; i < files.length; i++)
                visitAllDirsAndFiles(files[i], indent + 2);
        }
    }
}

執行上面範例程式碼，得到以下結果 -

The Directory is traversed.
-java_directories
---.classpath
---.project
---bin
-----com
-------yiibai
---------CreateDirectories.class
---------DeleteDirectory.class
---------DirectoryHierarchy.class
---------DirectoryHierarchy2.class
---------DirectoryModificationTime.class
---------DirectoryModificationTime2.class
---------DirectorySize.class
---------DirectorySize2.class
---------EmptyDirectory.class
---------HiddenDirectory.class
---------HiddenDirectory2.class
---------ParentDirectory.class
---------ParentDirectory2.class
---------SearchingFiles.class
---------SearchingFiles2.class
---------TraversingDirectory.class
---dir11
-----dir12
-------dir13
-----file1 - 副本.txt
-----file1.txt
---myfile.txt
---src
-----com
-------yiibai
---------CreateDirectories.java
---------DeleteDirectory.java
---------DirectoryHierarchy.java
---------DirectoryHierarchy2.java
---------DirectoryModificationTime.java
---------DirectoryModificationTime2.java
---------DirectorySize.java
---------DirectorySize2.java
---------EmptyDirectory.java
---------HiddenDirectory.java
---------HiddenDirectory2.java
---------ParentDirectory.java
---------ParentDirectory2.java
---------SearchingFiles.java
---------SearchingFiles2.java
---------TraversingDirectory.java