private File compressed(Image image, RCompress compress, String name) throws IOException {
if (null == image || null == compress) {
return null;
}
BufferedImage buffer =
new BufferedImage(compress.getWidth(), compress.getHeight(), BufferedImage.TYPE_INT_RGB);
// Image.SCALE_SMOOTH 的缩略算法 生成缩略图片的平滑度的 优先级比速度高 生成的图片质量比较好 但速度慢
if (buffer
.getGraphics()
.drawImage(
image.getScaledInstance(compress.getWidth(), compress.getHeight(), Image.SCALE_SMOOTH),
0,
0,
null)) {
return null;
}
File file = new File(name);
return ImageIO.write(buffer, compress.getFormat(), file) ? file : null;
}
public File compressed(File file, RCompress compress, String name) throws IOException {
if (null == file || null == compress) {
return null;
}
Image image = ImageIO.read(file);
if (null == image) {
return null;
}
if (-1 == image.getWidth(null)) {
return null;
}
if (compress.isProportion()) {
double rate1 = ((double) image.getWidth(null)) / (double) compress.getWidth() + 0.1;
double rate2 = ((double) image.getHeight(null)) / (double) compress.getHeight() + 0.1;
double rate = rate1 > rate2 ? rate1 : rate2;
compress.setWidth((int) (((double) image.getWidth(null)) / rate));
compress.setHeight((int) (((double) image.getHeight(null)) / rate));
}
return this.compressed(image, compress, name);
}