com.sun.image.codec.jpeg.JPEGImageDecoder decoder = null;
try {
decoder = JPEGCodec.createJPEGDecoder(new FileInputStream("F:/test/withExifAndIptc.jpg"));
JPEGDecodeParam param = decoder.getJPEGDecodeParam();
System.out.println(param);
int w = param.getWidth();
int xDensity = param.getXDensity();
int dpi = w / xDensity ;
System.out.println("dpi=========>"+dpi);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
为什么我的param得到的null?
try {
decoder = JPEGCodec.createJPEGDecoder(new FileInputStream("F:/test/withExifAndIptc.jpg"));
JPEGDecodeParam param = decoder.getJPEGDecodeParam();
System.out.println(param);
int w = param.getWidth();
int xDensity = param.getXDensity();
int dpi = w / xDensity ;
System.out.println("dpi=========>"+dpi);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
为什么我的param得到的null?
http://hi.baidu.com/good9006/blog/item/7a80bff953bc245c242df24f.html
JPEGImageDecoder jpegDecoder = JPEGCodec.createJPEGDecoder(new FileInputStream("F:/test/0810-新欢总是最爱-ol(CMYK+600dpi).jpg"));
BufferedImage image = jpegDecoder.decodeAsBufferedImage();
JPEGDecodeParam decodeParam = jpegDecoder.getJPEGDecodeParam();
System.out.println("w value = ====>"+decodeParam.getWidth());
System.out.println("XDensity= ====>"+decodeParam.getXDensity());
但是为什么会出现这种错误呢
java.lang.IllegalArgumentException: No APP0 er present
at sun.awt.image.codec.JPEGParam.getXDensity(JPEGParam.java:789)
at com.testImage.ImageDpi.main(ImageDpi.java:60)