java-删除某目录下所有文件

private boolean delZSPic(String filePath) {
    boolean flag = true;
    if(filePath != null) {
        File file = new File(filePath);
        if(file.exists()) {
            File[] filePaths = file.listFiles();
            for(File f : filePaths) {
                if(f.isFile()) {
                    f.delete();
                }
                if(f.isDirectory()){
                    String fpath = f.getPath();
                    delZSPic(fpath);
                    f.delete();
                }
            }
        }
    }else {
        flag = false;
    }
    return flag;
}