Question

我正在尝试读取PNG图像的尺寸，但在执行此操作时遇到以下错误 -

Exception in thread "main" javax.imageio.IIOException: I/O error reading PNG header!
at com.sun.imageio.plugins.png.PNGImageReader.readHeader(PNGImageReader.java:307)
at com.sun.imageio.plugins.png.PNGImageReader.readMetadata(PNGImageReader.java:637)
at com.sun.imageio.plugins.png.PNGImageReader.readImage(PNGImageReader.java:1212)
at com.sun.imageio.plugins.png.PNGImageReader.read(PNGImageReader.java:1560)
at javax.imageio.ImageIO.read(ImageIO.java:1422)
at javax.imageio.ImageIO.read(ImageIO.java:1326)

以下是我所拥有的代码 -

    InputStream is = new ByteArrayInputStream(myImgByteArray);
    BufferedImage image = ImageIO.read(is);
    System.out.println("Height: " +image.getHeight()+ "Width: " +image.getWidth());

有人可以建议我需要做些什么来解决这个问题吗？

Answer 1

您可以使用另一种方式获取图像尺寸：

BufferedImage image = javax.imageio.ImageIO.read(new File(imageFilePath));
System.out.println(image.getHeight());
System.out.println(image.getWidth());

Answer 2

这取决于你如何构建myImgByteArray。试试这个。

BufferedImage image = ImageIO.read(new FileInputStream((new File("resources/1.png"))));
System.out.println("Height: " + image.getHeight() + "Width: " + image.getWidth());

你可以尝试任何一个

// Read from same package 
ImageIO.read(getClass().getResourceAsStream("c.png"));

// Read from absolute path
ImageIO.read(new File("E:\\SOFTWARE\\TrainPIS\\res\\drawable\\c.png"));

// Read from images folder parallel to src in your project
ImageIO.read(new File("images\\c.jpg"));

Answer 3

当您在BuggeredImage中加载图像时，可能会出现问题。他是我的测试代码。

BufferedImage image = null;
       try {
            image = ImageIO.read(new File("/home/adrian/Documents/wave.png"));
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("Height: " +image.getHeight()+ " Width: " +image.getWidth());

这是输出：

Height: 1170 Width: 2576
BUILD SUCCESSFUL (total time: 0 seconds)

告诉我们你如何获得myImgByteArray，以便我们可以看到之前是否有错误。

Answer 4

你可以尝试这样：

public LoadImageApp() {
   try {
       img = ImageIO.read(new File("/workspace/ImageProject/src/myPic.png"));
   } catch (IOException e) {
       e.printStackTrace();
   }

}

public Dimension getPreferredSize() {
    if (img == null) {
         return new Dimension(100,100);
    } else {
       System.out.println("Height: " +img.getHeight()+ " Width: " +img.getWidth());        
       return new Dimension(img.getWidth(null), img.getHeight(null));
   }
}

确保正确调用文件位置！在Linux中，您的路径必须采用以下格式： /path/to/my/file.png 在Windows中，这是文件的路径： C:\\workspace\\path\to\myFile.png

读取PNG图像尺寸时出错

4 个答案: