程式很簡單 ，只需要在利用command在程式目錄下執行

java -jar ReSizeImage.jar

就可以啦!

預設是縮成以寬為500px基準，如果要改變寬可以利用

java -jar ReSizeImage.jar 數字

縮完的圖會放到程式目錄的resize目錄裡

我Blog都是以500寬為基準，我想應該夠用了吧^^

程式目錄結構

• ReSizeImage.jar
• jmagick.dll
• lib/Jmagick.jar

記得要先下載Imagick來安裝才能使用喔

按裝方法如下:

JMagick-Java open source free影像壓縮

範例圖檔可以按圖下載，放置於程式目錄

原始碼下載

class Tool整個壓縮以外的實作均在此

package image;

import java.io.*;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;

public class Tool {

    public Tool(int width) {

        // 取得class路徑所有檔案
        File f = new File(".");
        File[] list = f.listFiles();
        for (int i = 0; i < list.length; i++) {
            // 是否為圖檔,是的話進行縮圖
            if (isImg(getFileType(list[i].getName()))) {
                System.out.println("處理檔案名稱:" + list[i].getName());
                toCompressImg(list[i].getAbsolutePath(), getRealDir(list[i]
                        .getAbsolutePath())
                        + "resize" + File.separator + list[i].getName(), width);
            }
        }

    }

    // 取得副檔名
    private String getFileType(String str) {
        int startIndex = str.lastIndexOf(46) + 1;
        int endIndex = str.length();
        return str.substring(startIndex, endIndex); // 副檔名

    }

    // 傳入副檔名 檢查是否為指定圖檔jpg gif png
    private boolean isImg(String str) {
        return (("jpg,gif,png").indexOf(str.toLowerCase())) > -1;
    }

    // 找目錄
    private String getRealDir(String str) {
        int endIndex = str.lastIndexOf(File.separator) + 1;
        int startIndex = 0;
        return str.substring(startIndex, endIndex); // 副檔名
    }

    public void toCompressImg(String iFile, String oFile, int newWidth) {
        try {
            File fi = new File(iFile); // 大圖文件
            if (!fi.exists())
                return;
            String oPath = oFile
                    .substring(0, oFile.lastIndexOf(File.separator));
            File foPath = new File(oPath);
            if (!foPath.exists())
                if (foPath.mkdir())
                    System.out.println("ooo toCompressImg() File out path:"
                            + oPath + " mkdir成功!");
            File fo = new File(oFile); // 將要轉換出的小圖文件

            int nw = newWidth;
            // AffineTransform transform = new AffineTransform();
            BufferedImage bis = ImageIO.read(fi);
            int w = 0, h = 0;
            try {
                w = bis.getWidth();
                h = bis.getHeight();
            } catch (Exception e) {
                fileCopy(fi, fo);
                return;
            }
            if (nw > (w < h ? h : w)) {
                fileCopy(fi, fo);
                return;
            } // 壓縮寬度比原始檔大,那就不壓縮了;

            int nh = (nw * h) / w;
            // double sx = (double) nw / w;
            // double sy = (double) nh / h;

            JMagickScale.Compress(fi.getAbsolutePath(), fo.getAbsolutePath(),
                    nw, nh);
            /*
             * transform.setToScale(sx, sy); //System.out.println(w + ", " + h);
             * AffineTransformOp ato = new AffineTransformOp(transform, null);
             * BufferedImage bid = new BufferedImage(nw, nh,
             * BufferedImage.TYPE_3BYTE_BGR); ato.filter(bis, bid);
             * ImageIO.write(bid, "jpeg", fo);
             */
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void fileCopy(File inputFile, File outputFile) {
        FileInputStream fis = null;
        FileOutputStream fos = null;
        try {
            fis = new FileInputStream(inputFile);
            fos = new FileOutputStream(outputFile);
            int c;
            while ((c = fis.read()) != -1)
                fos.write(c);

            fis.close();
            fos.close();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    public static void main(String args[]) {
        int width = 500;

        try {
            width = Integer.parseInt(args[0]);
        } catch (Exception e) {

        }
        if (width <= 0) {
            System.out.println("Width Error");
        } else {
            new Tool(width);
        }

    }
}

class JmagickScale壓縮的實作

package image;

import magick.ImageInfo;
import magick.MagickException;
import magick.MagickImage;

public class JMagickScale {
    public static void Compress(String source, String To, int width, int height)
            throws MagickException {
        if (System.getProperty("jmagick.systemclassloader") == null) {
            System.setProperty("jmagick.systemclassloader", "no");
        }
        ImageInfo info = new ImageInfo(source);
        MagickImage image = new MagickImage(info);

        // resize image

        MagickImage scaleImg = image.scaleImage(width, height);

        // write image to file
        scaleImg.setFileName(To);
        scaleImg.writeImage(info);

    }
}

成功的圖，可以按進去flickr看壓好的圖效果