selenium - Selenium - TakesScreenshot - java - 转换为 jpg 时遇到问题

Question

我有以下java方法，它成功创建了png文件：

        TakesScreenshot scrShot = ((TakesScreenshot) webdriver);
        File SrcFile = scrShot.getScreenshotAs(OutputType.FILE);
        File DestFile = new File(fileWithPath + featureFileName + ".png");
//        BufferedImage img = ImageIO.read(SrcFile);
//        ImageIO.write(img, "jpg", new File(fileWithPath + featureFileName + ".jpg"));
        FileUtils.copyFile(SrcFile, DestFile);

我正在尝试使用 2 条注释行将图像转换为 jpg，但jpg没有生成输出文件。没有错误。无文件。我不知道为什么。提前感谢您的帮助。

Answer 1

You are likely using OpenJDK that is having number of issues with JPG encoding, especially when you convert from png.

• https://bugs.openjdk.java.net/browse/JDK-8211748
• ImageIO not able to write a JPEG file

So that your workaround would be to convert image BufferedImage to another BufferedImage and then save it like:

try {
    TakesScreenshot scrShot = ((TakesScreenshot) driver);
    File SrcFile = scrShot.getScreenshotAs(OutputType.FILE);
    BufferedImage pngImage  = ImageIO.read(SrcFile);
    int height = pngImage.getHeight();
    int width = pngImage.getWidth();
    BufferedImage jpgImage = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
    jpgImage.createGraphics().drawImage(pngImage, new AffineTransform(1f,0f,0f,1f,0,0), null);
    ImageIO.write(jpgImage, "jpg", new File("/your_path/output.jpg"));
} catch (IOException e) {
    e.printStackTrace();
}