1、本文仅为了提供图片上传过程中，部分java图片处理代码。
2、以下代码可以解决部分图片上传裁剪后整体变红等失真现象。
3、以下代码支持cmyk颜色模式的图片上传裁剪。
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/**
* 图片裁剪
* @param srcImageFile 裁剪前图片地址
* @param dirImageFile 裁剪后图片地址
* @param x 图片裁剪属性
* @param y 图片裁剪属性
* @param destWidth 图片裁剪属性
* @param destHeight 图片裁剪属性
*/
public
static
void
abscut(String srcImageFile,String dirImageFile,
int
x,
int
y,
int
destWidth,
int
destHeight) {
BufferedImage bi=
null
;
try
{
ImageFilter cropFilter;
Image img = Toolkit.getDefaultToolkit().getImage(srcImageFile);
//可讀取丟失ICC信息的圖片（裁剪后图片变红等现象的原因）
bi = toBufferedImage(img);
int
srcWidth = bi.getWidth();
int
srcHeight = bi.getHeight();
if
(srcWidth >= destWidth && srcHeight >= destHeight) {
Image image = bi.getScaledInstance(srcWidth, srcHeight,
Image.SCALE_DEFAULT);
cropFilter =
new
CropImageFilter(x, y, destWidth, destHeight);
img = Toolkit.getDefaultToolkit().createImage(
new
FilteredImageSource(image.getSource(), cropFilter));
BufferedImage tag =
new
BufferedImage(destWidth, destHeight,
BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(img,
0
,
0
,
null
);
g.dispose();
ImageIO.write(tag,
"jpg"
,
new
File(dirImageFile));
}
}
catch
(Exception e) {
System.out.println(
"ImageUtils图片裁剪异常:"
+e.getLocalizedMessage());
}
}
/**
* Image 转 BufferedImage
* @param image
* @return
*/
public
static
BufferedImage toBufferedImage(Image image) {
if
(image
instanceof
BufferedImage) {
return
(BufferedImage)image;
}
// This code ensures that all the pixels in the image are loaded
image =
new
ImageIcon(image).getImage();
// Determine if the image has transparent pixels; for this method's
// implementation, see e661 Determining If an Image Has Transparent Pixels
//boolean hasAlpha = hasAlpha(image);
// Create a buffered image with a format that's compatible with the screen
BufferedImage bimage =
null
;
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
try
{
// Determine the type of transparency of the new buffered image
int
transparency = Transparency.OPAQUE;
/* if (hasAlpha) {
transparency = Transparency.BITMASK;
}*/
// Create the buffered image
GraphicsDevice gs = ge.getDefaultScreenDevice();
GraphicsConfiguration gc = gs.getDefaultConfiguration();
bimage = gc.createCompatibleImage(
image.getWidth(null), image.getHeight(null), transparency);
} catch (HeadlessException e) {
// The system does not have a screen
}
if (bimage == null) {
// Create a buffered image using the default color model
int type = BufferedImage.TYPE_INT_RGB;
//int type = BufferedImage.TYPE_3BYTE_BGR;//by wang
/*if (hasAlpha) {
type = BufferedImage.TYPE_INT_ARGB;
}*/
bimage =
new
BufferedImage(image.getWidth(
null
), image.getHeight(
null
), type);
}
// Copy image to buffered image
Graphics g = bimage.createGraphics();
// Paint the image onto the buffered image
g.drawImage(image,
0
,
0
,
null
);
g.dispose();
return
bimage;
}
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本文转自 艺晨光 51CTO博客，原文链接：http://blog.51cto.com/ycgit/1735974，如需转载请自行联系原作者
