ImageIO读jpg的时候出现javax.imageio.IIOException: Unsupported Image Type

用java处理图片的时候，ImageIO读jpg的时候出现exception：bandOffsets.length is wrong。我也遇到过，最终也解决啦，把成果跟大家分享。

原因可能是JPEG图片的ICC信息可能已经被破坏了，所以ImageIO会抛出异常

解决办法：

BufferedImage bis = null;
   try{
       bis = ImageIO.read(file);
       bis.getWidth();
       bis.getHeight();
   }catch(Exception e){
    try
    {
     ThumbnailConvert tc = new ThumbnailConvert();
     tc.setCMYK_COMMAND(file.getPath());
     Image image =null;
     image = Toolkit.getDefaultToolkit().getImage(file.getPath());
       MediaTracker mediaTracker = new MediaTracker(new Container());
     mediaTracker.addImage(image, 0);
     mediaTracker.waitForID(0);
      image.getWidth(null);
     image.getHeight(null);
    }catch (Exception e1){
     e1.printStackTrace();
    }
   }

这两句代码，是处理cmyk类型的图片，需要ImageMagick的支持

ThumbnailConvert tc = new ThumbnailConvert();
     tc.setCMYK_COMMAND(file.getPath());//用于把cmyk转成rgb

ImageMagick的具体指令是：mogrify -colorspace RGB -quality 100 file1


ThumbnailConvert.java

private String CMYK_COMMAND = "mogrify -colorspace RGB -quality 80 file1";//转换cmyk格式   
  
public void setCMYK_COMMAND(String file1) {   
exeCommand(CMYK_COMMAND.replace("file1", file1));   
}   
  
public boolean exeCommand(String cmd){   
InputStreamReader ir = null;   
LineNumberReader input = null;   
try   
{   
//linux下java执行指令：Runtime.getRuntime().exec (String str);   
Process process = Runtime.getRuntime().exec (cmd);   
ir=new InputStreamReader(process.getInputStream());   
input = new LineNumberReader (ir);   
while ((input.readLine ()) != null){   
}   
ir.close();   
input.close();   
}   
catch (java.io.IOException e){   
System.err.println ("IOException " + e.getMessage());   
return false;   
}   
return true;   
}