/**

* ��������ͼ��

*/

package utils;

/**

* @author advance

*

*/

import java.awt.Color;

import java.awt.Graphics2D;

import java.awt.Image;

import java.awt.RenderingHints;

import java.awt.image.BufferedImage;

import java.io.File;

public class ThumbnailGenerator {

public static void main(String[] args) throws Exception {

transform("C:\\Users\\Administrator\\vspider\\files\\20190111\\image\\jpg\\0a08179283e02baefc529affd2dd30fe.jpg","C:\\Users\\Administrator\\Desktop\\新建文件夹 (2)\\aaa.jpg",200,300,1000);

}

public static void transform(String originalFile, String thumbnailFile, int thumbWidth, int thumbHeight, int quality) throws Exception

{

Image image = javax.imageio.ImageIO.read(new File(originalFile));

double thumbRatio = (double)thumbWidth / (double)thumbHeight;

int imageWidth = image.getWidth(null);

int imageHeight = image.getHeight(null);

double imageRatio = (double)imageWidth / (double)imageHeight;

if (thumbRatio < imageRatio)

{

thumbHeight = (int)(thumbWidth / imageRatio);

}

else

{

thumbWidth = (int)(thumbHeight * imageRatio);

}

if(imageWidth < thumbWidth && imageHeight < thumbHeight)

{

thumbWidth = imageWidth;

thumbHeight = imageHeight;

}

else if(imageWidth < thumbWidth)

thumbWidth = imageWidth;

else if(imageHeight < thumbHeight)

thumbHeight = imageHeight;

BufferedImage thumbImage = new BufferedImage(thumbWidth, thumbHeight, BufferedImage.TYPE_INT_RGB);

Graphics2D graphics2D = thumbImage.createGraphics();

graphics2D.setBackground(Color.WHITE);

graphics2D.setPaint(Color.WHITE);

graphics2D.fillRect(0, 0, thumbWidth, thumbHeight);

graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);

graphics2D.drawImage(image, 0, 0, thumbWidth, thumbHeight, null);

javax.imageio.ImageIO.write(thumbImage, "JPG", new File(thumbnailFile));

}

}