本文介绍了如何从 BufferedImage 获取 InputStream?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
如何从 BufferedImage 对象获取 InputStream?我试过了，但 ImageIO.createImageInputStream() 总是返回 NULL
How can I get an InputStream from a BufferedImage object? I tried this but ImageIO.createImageInputStream() always returns NULL
BufferedImage bigImage = GraphicsUtilities.createThumbnail(ImageIO.read(file), 300);
ImageInputStream bigInputStream = ImageIO.createImageInputStream(bigImage);
图像缩略图正在正确生成，因为我可以成功地将 bigImage 绘制到 JPanel.
The image thumbnail is being correctly generated since I can paint bigImage to a JPanel with success.
推荐答案
如果您尝试将图像保存到文件，请尝试:
If you are trying to save the image to a file try:
ImageIO.write(thumb, "jpeg", new File(....));
如果您只想要字节，请尝试执行 write 调用，但将其传递给 ByteArrayOutputStream，然后您就可以从中取出字节数组并按照您的意愿使用它.
If you just want at the bytes try doing the write call but pass it a ByteArrayOutputStream which you can then get the byte array out of and do with it what you want.
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