压缩图片（三）

import javax.imageio.ImageIO;import java.awt.*;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.math.BigDecimal;import java.math.MathContext;import java.util.ArrayList;/***  * 对图片进行操作  * * @author chenzheng_java * @since 2011/7/29  * */public class ImageHelper {    private static ImageHelper imageHelper = null;    public static ImageHelper getImageHelper() {        if (imageHelper == null) {            imageHelper = new ImageHelper();        }        return imageHelper;    }    public static void main(String[] args) {       getImageHelper().scaleImage("F:\\oldImage\\20155913wm5y.png","F:\\newImage\\shijian.png",1.2,"jpg");    }    /***     * 按指定的比例缩放图片     *     * @param sourceImagePath     *      源地址     * @param destinationPath     *      改变大小后图片的地址     * @param scale     *      缩放比例，如1.2     */    public static void scaleImage(String sourceImagePath,                                  String destinationPath, double scale,String format) {        File file = new File(sourceImagePath);        BufferedImage bufferedImage;        try {            bufferedImage = ImageIO.read(file);            int width = bufferedImage.getWidth();            int height = bufferedImage.getHeight();            width = parseDoubleToInt(width * scale);            height = parseDoubleToInt(height * scale);            Image image = bufferedImage.getScaledInstance(width, height,                    Image.SCALE_SMOOTH);            BufferedImage outputImage = new BufferedImage(width, height,                    BufferedImage.TYPE_INT_RGB);            Graphics graphics = outputImage.getGraphics();            graphics.drawImage(image, 0, 0, null);            graphics.dispose();            ImageIO.write(outputImage, format, new File(destinationPath));           outputImage.flush();        } catch (IOException e) {            System.out.println("scaleImage方法压缩图片时出错了");            e.printStackTrace();        }    }    /***     * 将图片缩放到指定的高度或者宽度     * @param sourceImagePath 图片源地址     * @param destinationPath 压缩完图片的地址     * @param width 缩放后的宽度     * @param height 缩放后的高度     * @param auto 是否自动保持图片的原高宽比例     * @param format 图图片格式 例如 jpg     */    public static void scaleImageWithParams(String sourceImagePath,                                            String destinationPath, int width, int height, boolean auto,String format) {        try {            File file = new File(sourceImagePath);            BufferedImage bufferedImage = null;            bufferedImage = ImageIO.read(file);            if (auto) {                ArrayList<Integer> paramsArrayList = getAutoWidthAndHeight(bufferedImage,width,height);                width = paramsArrayList.get(0);                height = paramsArrayList.get(1);                System.out.println("自动调整比例，width="+width+" height="+height);            }            Image image = bufferedImage.getScaledInstance(width, height,                    Image.SCALE_DEFAULT);            BufferedImage outputImage = new BufferedImage(width, height,                    BufferedImage.TYPE_INT_RGB);            Graphics graphics = outputImage.getGraphics();            graphics.drawImage(image, 0, 0, null);            graphics.dispose();            ImageIO.write(outputImage, format, new File(destinationPath));        } catch (Exception e) {            System.out.println("scaleImageWithParams方法压缩图片时出错了");            e.printStackTrace();        }    }    /**     * 将double类型的数据转换为int，四舍五入原则     *     * @param sourceDouble     * @return     */    private static int parseDoubleToInt(double sourceDouble) {        int result = 0;        result = (int) sourceDouble;        return result;    }    /***     *     * @param bufferedImage 要缩放的图片对象     * @param width_scale 要缩放到的宽度     * @param height_scale 要缩放到的高度     * @return 一个集合，第一个元素为宽度，第二个元素为高度     */    private static ArrayList<Integer> getAutoWidthAndHeight(BufferedImage bufferedImage,int width_scale,int height_scale){        ArrayList<Integer> arrayList = new ArrayList<Integer>();        int width = bufferedImage.getWidth();        int height = bufferedImage.getHeight();        double scale_w =getDot2Decimal( width_scale,width);        System.out.println("getAutoWidthAndHeight width="+width + "scale_w="+scale_w);        double scale_h = getDot2Decimal(height_scale,height);        if (scale_w<scale_h) {            arrayList.add(parseDoubleToInt(scale_w*width));            arrayList.add(parseDoubleToInt(scale_w*height));        }        else {            arrayList.add(parseDoubleToInt(scale_h*width));            arrayList.add(parseDoubleToInt(scale_h*height));        }        return arrayList;    }    /***     * 返回两个数a/b的小数点后三位的表示     * @param a     * @param b     * @return     */    public static double getDot2Decimal(int a,int b){        BigDecimal bigDecimal_1 = new BigDecimal(a);        BigDecimal bigDecimal_2 = new BigDecimal(b);        BigDecimal bigDecimal_result = bigDecimal_1.divide(bigDecimal_2,new MathContext(4));        Double double1 = new Double(bigDecimal_result.toString());        System.out.println("相除后的double为："+double1);        return double1;    }} 

第二个

import javax.imageio.ImageIO;import java.awt.*;import java.awt.image.BufferedImage;import java.io.*;/** * @author wuyu * @versions 1.0 图片压缩工具类 提供的方法中可以设定生成的 * 缩略图片的大小尺寸等 */public class ImageZip {    /**     * 程序入口      * 将图片按照指定的图片尺寸压缩     *     * @param srcImgPath     *            源图片路径     * @param outImgPath     *            输出的压缩图片的路径     * @param new_w     *            压缩后的图片宽     * @param new_h     *            压缩后的图片高     */    public static void compressImage(InputStream inputStream, String outImgPath, int new_w, int new_h) {        System.err.println(outImgPath);        BufferedImage src = InputImage(inputStream);        disposeImage(src, outImgPath, new_w, new_h);    }    public static void main(String[] args) throws FileNotFoundException {        String inpath="F:\\oldImage\\20155913wm5y.png";        String outImagepath="F:\\newImage\\123.png";        File file = new File(inpath);        InputStream in = new FileInputStream(file);        disposeImage(InputImage(in),outImagepath,100,200);    }    /**     * 读取图片     */    private static BufferedImage InputImage(InputStream inputStream) {        BufferedImage srcImage = null;        try {            srcImage = ImageIO.read(inputStream);        } catch (IOException e) {            System.out.println("读取图片文件出错！" + e.getMessage());            e.printStackTrace();        }        return srcImage;    }    /**     * 处理图片     * @param src     * @param outImgPath     * @param new_w     * @param new_h     */    private synchronized static void disposeImage(BufferedImage src, String outImgPath, int new_w, int new_h) {        // 得到图片        int old_w = src.getWidth();        // 得到源图宽        int old_h = src.getHeight();        // 得到源图长        BufferedImage newImg = null;        // 判断输入图片的类型        switch (src.getType()) {            case 13:                // png,gifnewImg = new BufferedImage(new_w, new_h,                // BufferedImage.TYPE_4BYTE_ABGR);                break;            default:                newImg = new BufferedImage(new_w, new_h, BufferedImage.TYPE_INT_RGB);                break;        }        Graphics2D g = newImg.createGraphics();        // 从原图上取颜色绘制新图        g.drawImage(src, 0, 0, old_w, old_h, null);        g.dispose();        // 根据图片尺寸压缩比得到新图的尺寸        newImg.getGraphics().drawImage(src.getScaledInstance(new_w, new_h, Image.SCALE_SMOOTH), 0, 0, null);        // 调用方法输出图片文件        OutImage(outImgPath, newImg);    }    /**     * 将图片文件输出到指定的路径，并可设定压缩质量     *     * @param outImgPath     * @param newImg     * @param     */    private static void OutImage(String outImgPath, BufferedImage newImg) {        // 判断输出的文件夹路径是否存在，不存在则创建        File file = new File(outImgPath);        if (!file.getParentFile().exists()) {            file.getParentFile().mkdirs();        } // 输出到文件流        try {            ImageIO.write(newImg, outImgPath.substring(outImgPath.lastIndexOf(".") + 1), new File(outImgPath));        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }}