Java中刪除文件、刪除目錄及目錄下所有文件

轉載http://www.cnblogs.com/eczhou/archive/2012/01/16/2323431.html

Java中刪除文件、刪除目錄及目錄下所有文件

功能：刪除某個目錄及目錄下的所有子目錄和文件

知識點：File.delete()用於刪除“某個文件或者空目錄”！所以要刪除某個目錄及其中的所有文件和子目錄，要進行遞歸刪除，具體代碼示例如下：

import java.io.File;

public class DeleteDirectory {
    /**
     * 刪除空目錄
     * @param dir 將要刪除的目錄路徑
     */
    private static void doDeleteEmptyDir(String dir) {
        boolean success = (new File(dir)).delete();
        if (success) {
            System.out.println("Successfully deleted empty directory: " + dir);
        } else {
            System.out.println("Failed to delete empty directory: " + dir);
        }
    }

    /**
     * 遞歸刪除目錄下的所有文件及子目錄下所有文件
     * @param dir 將要刪除的文件目錄
     * @return boolean Returns "true" if all deletions were successful.
     *                 If a deletion fails, the method stops attempting to
     *                 delete and returns "false".
     */
    private static boolean deleteDir(File dir) {
        if (dir.isDirectory()) {
            String[] children = dir.list();
　　　　　　　//遞歸刪除目錄中的子目錄下
            for (int i=0; i<children.length; i++) {
                boolean success = deleteDir(new File(dir, children[i]));
                if (!success) {
                    return false;
                }
            }
        }
        // 目錄此時爲空，可以刪除
        return dir.delete();
    }
    /**
     *測試
     */
    public static void main(String[] args) {
        doDeleteEmptyDir("new_dir1");
        String newDir2 = "new_dir2";
        boolean success = deleteDir(new File(newDir2));
        if (success) {
            System.out.println("Successfully deleted populated directory: " + newDir2);
        } else {
            System.out.println("Failed to delete populated directory: " + newDir2);
        }     
    }
}