import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.image.ConvolveOp;
import java.awt.image.Kernel;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.swing.ImageIcon;

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

@SuppressWarnings("restriction")
public class ImageUtil {
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);

if (iWidth > iHeight) {
resizedImage = i.getScaledInstance(newWidth, (newWidth * iHeight)
/ iWidth, Image.SCALE_SMOOTH);
} else {
resizedImage = i.getScaledInstance((newWidth * iWidth) / iHeight,
newWidth, Image.SCALE_SMOOTH);
}

// This code ensures that all the pixels in the image are loaded.
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
@SuppressWarnings("restriction")
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);

@SuppressWarnings("restriction")
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:\\11.jpg");
// resize(originalImage, new File("c:\\11-0.jpg"),150, 0.7f);
// resize(originalImage, new File("c:\\11-1.jpg"),150, 1f);
File originalImage = new File("F:\\图片\\图像\\meitu_00026_副本.jpg");
resize(originalImage, new File("d:\\aaa\\meitu_00026_aaa.jpg"),150, 0.7f);
resize(originalImage, new File("d:\\aaa\\meitu_00026_bbb.jpg"),150, 1f);
System.out.println("转化成功");
}
}

Java中的类JPEGImageEncoder,JPEGCodec和JPEGEncodeParam的导入问题

java的图片压缩，需要用这三个类，默认这三个类在eclipse是导不进来，直接报错的。

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

解决办法：
Eclipse默认把这些受访问限制的API设成了ERROR。只要把Windows-Preferences-Java-Complicer-Errors/Warnings里面的Deprecated and restricted API中的Forbidden references(access rules)选为Warning就可以编译通过。

java图片高质量缩放类,布布扣,bubuko.com

java图片高质量缩放类