我要评论可按照比例缩放，也可以指定宽高
import com.sun.image.codec.jpeg.jpegimageencoder;
import com.sun.image.codec.jpeg.jpegcodec;
import com.sun.image.codec.jpeg.jpegencodeparam;
import javax.swing.*;
import java.io.file;
import java.io.fileoutputstream;
import java.io.ioexception;
import java.awt.*;
import java.awt.image.bufferedimage;
import java.awt.image.kernel;
import java.awt.image.convolveop;
public class imageutil {
/**
*
* @param originalfile 原文件
* @param resizedfile 压缩目标文件
* @param newwidth 压缩后的图片宽度
* @param quality 压缩质量（0到1之间，越高质量越好）
* @throws ioexception
*/
public static void resize(file originalfile, file resizedfile,
int newwidth, float quality) throws ioexception {
if (quality > 1) {
throw new illegalargumentexception(
"quality has to be between 0 and 1");
}
imageicon ii = new imageicon(originalfile.getcanonicalpath());
image i = ii.getimage();
image resizedimage = null;
int iwidth = i.getwidth(null);
int iheight = i.getheight(null);
//比例缩放
if (iwidth > iheight) {
resizedimage = i.getscaledinstance(newwidth, (newwidth * iheight)
/ iwidth, image.scale_smooth);
} else {
resizedimage = i.getscaledinstance((newwidth * iwidth) / iheight,
newwidth, image.scale_smooth);
}
//指定宽高
image temp = new imageicon(resizedimage).getimage();
// create the buffered image.
bufferedimage bufferedimage = new bufferedimage(temp.getwidth(null),
temp.getheight(null), bufferedimage.type_int_rgb);
// copy image to buffered image.
graphics g = bufferedimage.creategraphics();
// clear background and paint the image.
g.setcolor(color.white);
g.fillrect(0, 0, temp.getwidth(null), temp.getheight(null));
g.drawimage(temp, 0, 0, null);
g.dispose();
// soften.
float softenfactor = 0.05f;
float[] softenarray = { 0, softenfactor, 0, softenfactor,
1 - (softenfactor * 4), softenfactor, 0, softenfactor, 0 };
kernel kernel = new kernel(3, 3, softenarray);
convolveop cop = new convolveop(kernel, convolveop.edge_no_op, null);
bufferedimage = cop.filter(bufferedimage, null);
// write the jpeg to a file.
fileoutputstream out = new fileoutputstream(resizedfile);
// encodes image as a jpeg data stream
jpegimageencoder encoder = jpegcodec.createjpegencoder(out);
jpegencodeparam param = encoder
.getdefaultjpegencodeparam(bufferedimage);
param.setquality(quality, true);
encoder.setjpegencodeparam(param);
encoder.encode(bufferedimage);
} // example usage
public static void main(string[] args) throws ioexception {
file originalimage = new file("c:p7.gif");
resize(originalimage, new file("c:p7-0.jpg"),150, 0.7f);
resize(originalimage, new file("c:p7-1.jpg"),150, 1f);
}
}
以上就是java高质量缩放图片的示例代码的详细内容，更多关于java 缩放图片的资料请关注移动技术网其它相关文章！
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