java - 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获取缓冲图像格式或图像类型，

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

Answer 1

参考javax.imageio.ImageIO.read()代码

这段代码最初是用 groovy 实现的，但翻译成 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();
    }
}

Answer 2

This code might help you to get the extension of image

public static String getFormate(String ImageName) {

    return (ImageName.substring(ImageName.indexOf('.'),ImageName.length()));
}

In the above code first it searches dot(.) and with help of substring() it will return the extension