java - 如何捕获 sun.awt.image.PNGImageDecoder$PNGException？

Question

如何捕获尝试加载损坏的 PNG 文件时打印到错误控制台的以下异常:

sun.awt.image.PNGImageDecoder$PNGException: invalid depth
    at sun.awt.image.PNGImageDecoder.produceImage(Unknown Source)
    at sun.awt.image.InputStreamImageSource.doFetch(Unknown Source)
    at sun.awt.image.ImageFetcher.fetchloop(Unknown Source)
    at sun.awt.image.ImageFetcher.run(Unknown Source)

以下代码使上述输出出现在错误控制台中。但异常永远不会被捕获:

import javax.swing.ImageIcon;

public class TestBadPNG
  {

    public static void main(String[] args)
      {
        try
          {
            new ImageIcon(new byte[] { -119, 80, 78, 71, 13, 10, 26, 10, 0, });
          }
        catch (Exception e)
          {
            // This line will not be reached.
            System.err.println("Bad image.");
          }
      }
  }

图像可能应该以不同的方式加载？

谢谢!

Answer 1

我不熟悉ImageIcon，但您可以先尝试从源(您的byte[]数组)创建图像，然后然后，如果一切顺利，创建ImageIcon。

像这样:

    ByteArrayInputStream bas = new ByteArrayInputStream( new byte[] { -119, 80, 78, 71, 13, 10, 26, 10, 0, } );
    Image img = null;
    try {
        img = ImageIO.read( bas );
    } catch (IOException e) {
        ... // You'll catch that one should it happen...
    }

然后，如果一切顺利，您将创建 ImageIcon:

ImageIcon ii = new ImageIcon( img );