请问：以下代码什么意思？谢谢！！

Question

String sourcefile = path;
InputStream is = new FileInputStream(sourcefile);
Workbook rwb = Workbook.getWorkbook(is);

Answer 1

String sourcefile = path; //设置文件路径
InputStream is = new FileInputStream(sourcefile); //打开文件流
Workbook rwb = Workbook.getWorkbook(is); //把文件流传给Workbook对象，打开工作薄