如何在java中获取图像文件(BufferedImage)的格式(例如:jpen,png,gif)

Question

我想使用java获取缓冲的图像格式或图像类型,

 InputStream stream = request.getResponseStream();   
 BufferedImage image=  ImageIO.read(stream);
 LOGGER.info(image);

Answer 1

请参阅ImageIO.read()代码

此代码最初在groovy中实现但转换为java所以它可能有语法错误.

public String read(InputStream input) throws IOException {
    ImageInputStream stream = ImageIO.createImageInputStream(input);

    Iterator iter = ImageIO.getImageReaders(stream);
    if (!iter.hasNext()) {
        return null;
    }
    ImageReader reader = (ImageReader) iter.next();
    ImageReadParam param = reader.getDefaultReadParam();
    reader.setInput(stream, true, true);
    BufferedImage bi;
    try {
        bi = reader.read(0, param);
        return reader.getFormatName();
    } finally {
        reader.dispose();
        stream.close();
    }
}