本文实例讲述了Java实现的不同图片居中剪裁生成同一尺寸缩略图功能。分享给大家供大家参考,具体如下:
因为业务需要,写了这样一个简单类,希望能帮助对有这方面需要的人,高手莫笑
源码如下:
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package platform.edu.resource.utils;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
/**
* 图片工具类
* @author hjn
* @version 1.0 2013-11-26
*
*/
public class ImageUtil {
/**
* 图片等比缩放居中剪裁
* 不管尺寸不等的图片生成的缩略图都是同一尺寸,方便用于页面展示
* @param imageSrc图片所在路径
* @param thumbWidth缩略图宽度
* @param thumbHeight缩略图长度
* @param outFilePath缩略图存放路径
* @throws InterruptedException
* @throws IOException
*/
public static void createImgThumbnail(String imgSrc, int thumbWidth, int thumbHeight, String outFilePath) throws InterruptedException, IOException {
File imageFile= new File(imgSrc);
BufferedImage image = ImageIO.read(imageFile);
Integer width = image.getWidth();
Integer height = image.getHeight();
double i = ( double ) width / ( double ) height;
double j = ( double ) thumbWidth / ( double ) thumbHeight;
int [] d = new int [ 2 ];
int x = 0 ;
int y = 0 ;
if (i > j) {
d[ 1 ] = thumbHeight;
d[ 0 ] = ( int ) (thumbHeight * i);
y = 0 ;
x = (d[ 0 ] - thumbWidth) / 2 ;
} else {
d[ 0 ] = thumbWidth;
d[ 1 ] = ( int ) (thumbWidth / i);
x = 0 ;
y = (d[ 1 ] - thumbHeight) / 2 ;
}
File outFile = new File(outFilePath);
if (!outFile.getParentFile().exists()) {
outFile.getParentFile().mkdirs();
}
/*等比例缩放*/
BufferedImage newImage = new BufferedImage(d[0],d[1],image.getType());
Graphics g = newImage.getGraphics();
g.drawImage(image, 0,0,d[0],d[1],null);
g.dispose();
/*居中剪裁*/
newImage = newImage.getSubimage(x, y, thumbWidth, thumbHeight);
ImageIO.write(newImage, imageFile.getName().substring(imageFile.getName().lastIndexOf( "." ) + 1 ), outFile);
}
}
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希望本文所述对大家java程序设计有所帮助。
原文链接:http://blog.csdn.net/h348592532/article/details/16981271