3、循环读取文件夹及文件夹中的文件

 private List<String> getFileList(String path){
        //存放读取出文件的地址路径
        List<String> fileLists = new ArrayList<>();
        try {
            //获取path路径下的内容(文件和文件夹)
            FTPFile[] files = ftpClient.listFiles(path);
            for (int i = 0; i < files.length; i++) {
                FTPFile file = files[i];
                if (file.isFile()) {
                    //获取文件或文件夹名称
                    String saveAsFileName = file.getName();
                    String filePath = path + saveAsFileName;
                    fileLists.add(filePath);
                }else if (file.isDirectory()){
                    //子文件夹下的文件夹路径
                    String childLists = path + file.getName()+ "/";
                    List<String> fileList = getFileList(childLists);
                    this.insertData(fileList);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return fileLists;
    }