递归删除文件夹

/**

     * @方法名称：deleteFolder

     * @方法描述：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".

     * @作者日期：liurui   2017-07-15

     */

    public 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();

    }