Java中删除文件、删除目录及目录下所有文件

功能：删除某个目录及目录下的所有子目录和文件

知识点：File.delete()用于删除“某个文件或者空目录”！所以要删除某个目录及其中的所有文件和子目录，要进行递归删除，具体代码示例如下：

import java.io.File;public class DeleteDirectory {    /**     * 删除空目录     * @param dir 将要删除的目录路径     */    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);        }    }    /**     * 递归删除目录下的所有文件及子目录下所有文件     * @param dir 将要删除的文件目录     * @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();　　　　　　　//递归删除目录中的子目录下            for (int i=0; i<children.length; i++) {                boolean success = deleteDir(new File(dir, children[i]));                if (!success) {                    return false;                }            }        }        // 目录此时为空，可以删除        return dir.delete();    }    /**     *测试     */    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);        }         }}

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