java基础---->Java中图片的缩放

　　缩略图代表网页上或计算机中图片经压缩方式处理后的小图 ，其中通常会包含指向完整大小的图片的超链接。缩略图用于在 Web 浏览器中更加迅速地装入图形或图片较多的网页。今天，我们就开始java中图像的缩略图的学习。thumbnailator框架的使用：  Java三方---->Thumbnailator框架的使用

使用jdk自带bufferedImage

项目结构如下：

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" alt="" />

一、 JDKZoomImage.java

package com.huhx.jdk;

import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
/**
 * writer: huhx
 */
public class JDKZoomImage {
    public void zoomImage() {
        BufferedImage bufferedImage = null;
        File file = new File("image/huhx.jpg");
        if (file.canRead()) {
            try {
                bufferedImage = ImageIO.read(file);
                bufferedImage = zoomInImage(bufferedImage, 5);
                ImageIO.write(bufferedImage, "JPG", new File("image/zoomHuhx.jpg"));
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    private BufferedImage zoomInImage(BufferedImage bufferedImage, int times) {
        int width = bufferedImage.getWidth() / times;
        int height = bufferedImage.getHeight() / times;

        BufferedImage newImage = new BufferedImage(width, height, bufferedImage.getType());
        Graphics graphics = newImage.getGraphics();
        graphics.drawImage(bufferedImage, 0, 0, width, height, null);
        graphics.dispose();
        return newImage;
    }

    public static void main(String[] args) {
        new JDKZoomImage().zoomImage();
    }
}

二、 结果如下，生成图片zoomHuhx.jpg

huhx.jpg   　　  1366 * 768      398KB

zoomHuhx.jpg   273*153          18.4KB

使用thumbnailator框架

thumbnailator包的地址： http://pan.baidu.com/s/1jI8jjfg。humbnailator框架的具体使用，请参见我的另外博客：Java三方---->Thumbnailator框架的使用

ThumbnailatorImage.java的内容如下：

package com.huhx.jdk;

import java.io.File;
import java.io.IOException;
import net.coobird.thumbnailator.Thumbnails;
import net.coobird.thumbnailator.name.Rename;

/**
 * @author huhx
 */
public class ThumbnailatorImage {
    // 根据缩放比缩放图片
    public void zoomImageWithScale() {
        try {
            Thumbnails.of(new File("image/huhx.jpg").listFiles()).scale(0.2).outputFormat("jpg").toFiles(Rename.PREFIX_DOT_THUMBNAIL);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    // 根据固定大小缩放图片
    public void zoomImageWithSize() {
        try {
            Thumbnails.of(new File("image/huhx.jpg").listFiles()).size(640, 480).outputFormat("jpg").toFiles(Rename.PREFIX_DOT_THUMBNAIL);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        ThumbnailatorImage image = new ThumbnailatorImage();
        image.zoomImageWithScale();
        image.zoomImageWithSize();
    }
}

• thumbnailator框架的使用：  Java三方---->Thumbnailator框架的使用