我认为使用机器人框架比自动化更方便

//open the upload window from upload option
     driver.findElement(By.id("yourID")).click();

     //add your upload file path including filename and extension
     StringSelection ss = new StringSelection("C://Users//zsbappa//Desktop//myfile.csv");
     Toolkit.getDefaultToolkit().getSystemClipboard().setContents(ss, null);

     //imitate mouse events like ENTER, CTRL+C, CTRL+V We are just paste file name in the path using mouse event

     Robot robot = new Robot();
     robot.delay(250);
     robot.keyPress(KeyEvent.VK_ENTER);
     robot.keyRelease(KeyEvent.VK_ENTER);
     robot.keyPress(KeyEvent.VK_CONTROL);
     robot.keyPress(KeyEvent.VK_V);
     robot.keyRelease(KeyEvent.VK_V);
     robot.keyRelease(KeyEvent.VK_CONTROL);
     robot.keyPress(KeyEvent.VK_ENTER);
     robot.delay(90);
     robot.keyRelease(KeyEvent.VK_ENTER);