一图片压缩的java类，大小变小，宽度高度不变

来源：互联网发布：污是什么意思网络语言编辑：程序博客网时间：2024/05/02 04:16
package Test;import java.awt.Color; import java.awt.Graphics2D;import java.awt.Image;import java.awt.image.BufferedImage;import java.awt.image.ConvolveOp;import java.awt.image.Kernel;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import javax.imageio.ImageIO;import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGEncodeParam;import com.sun.image.codec.jpeg.JPEGImageEncoder;public class ImageCompress {    /**     * 描述：     *      * @param path     *            需要压缩的图片路径     * @param fileName     *            要压缩的图片名称     * @param toFileName     *            压缩后的图片名称     * @param scale     *            压缩比例 不能大于1,默认0.5     * @param quality     *            压缩品质介于0.1~1.0之间     * @param width     *            压缩后的图片的宽度     * @param height     *            压缩后的图片的高度 返回值：void     */    static void imageCompress(String path, String fileName,            String toFileName, float scale, float quality, int width, int height) {        try { // 原图路径 原图名称 目标路径 压缩比率0.5 0.75 原图宽度 原图高度            long start = System.currentTimeMillis();             System.out.println(path + fileName);                Image image = javax.imageio.ImageIO.read(new File(path + fileName));            int imageWidth = image.getWidth(null);              int imageHeight = image.getHeight(null);            if (scale > 0.5)                 scale = 0.5f;// 默认压缩比为0.5，压缩比越大，对内存要去越高，可能导致内存溢出            // 按比例计算出来的压缩比            float realscale = getRatio(imageWidth, imageHeight, width, height);            float finalScale = Math.min(scale, realscale);// 取压缩比最小的进行压缩                        /*imageWidth = (int) (finalScale * imageWidth);            imageHeight = (int) (finalScale * imageHeight);*/            imageWidth = width;            imageHeight=height;                        image = image.getScaledInstance(imageWidth, imageHeight,                    Image.SCALE_AREA_AVERAGING);            // Make a BufferedImage from the Image.            BufferedImage mBufferedImage = new BufferedImage(imageWidth,                    imageHeight, BufferedImage.TYPE_INT_RGB);            Graphics2D g2 = mBufferedImage.createGraphics();            g2.drawImage(image, 0, 0, imageWidth, imageHeight, Color.white,                    null);            g2.dispose();            float[] kernelData2 = { -0.125f, -0.125f, -0.125f, -0.125f, 2,                    -0.125f, -0.125f, -0.125f, -0.125f };            Kernel kernel = new Kernel(3, 3, kernelData2);            ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);            mBufferedImage = cOp.filter(mBufferedImage, null);            FileOutputStream out = new FileOutputStream(path + toFileName);            System.out.println(path + toFileName);            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);            JPEGEncodeParam param = encoder                    .getDefaultJPEGEncodeParam(mBufferedImage);            param.setQuality(quality, true);// 默认0.75            encoder.setJPEGEncodeParam(param);            encoder.encode(mBufferedImage);            out.close();            long end = System.currentTimeMillis();            System.out.println("图片：" + fileName + "，压缩时间：" + (end - start)                    + "ms");        } catch (FileNotFoundException fnf) {        } catch (IOException ioe) {            System.out.println("亲  哪里不对了");             //ioe.printStackTrace();        } catch (Exception ex) {            ex.printStackTrace();        } finally {        }    }    public static void imageCompress(String path, String fileName,            String toFileName, float scale, int width, int height) {        imageCompress(path, fileName, toFileName, scale, 0.75f, width, height);    }       private static float getRatio(int width, int height, int maxWidth,            int maxHeight) {// 获得压缩比率的方法        float Ratio = 1.0f;        float widthRatio;        float heightRatio;        widthRatio = (float) maxWidth / width;        heightRatio = (float) maxHeight / height;        if (widthRatio < 1.0 || heightRatio < 1.0) {            Ratio = widthRatio <= heightRatio ? widthRatio : heightRatio;        }        return Ratio;    }    public static byte[] convertImage2Type(String imageFile, String imageType)            throws Exception {// 图片格式转换        File inputFile = new File(imageFile);        ByteArrayOutputStream output = new ByteArrayOutputStream();        BufferedImage input = ImageIO.read(inputFile);        ImageIO.write(input, imageType, output);        return output.toByteArray();    }    public static void convertImage2TypePng(String imageFile, String imageType)            throws Exception {// 图片格式转换        File inputFile = new File(imageFile);        int suffixIndex = imageFile.lastIndexOf(".");        String suffix = imageFile.substring(suffixIndex + 1);        if (!"png".equals(suffix)) {// 如果原图片的不是PNG格式的图片            String fileName = imageFile.substring(0, suffixIndex + 1) + "png";            File output = new File(fileName);            BufferedImage input = ImageIO.read(inputFile);            ImageIO.write(input, imageType, output);            // 转换后删除原文件            if (inputFile.exists())                inputFile.delete();        }    }        public static void main(String[] args) {    //需要压缩的图片路径    String firpath ="E:/upload/";     //要压缩的图片名称      String firpathname ="a.jpg";    //压缩后的图片名称    String laspathname ="b.jpg";    //压缩后的图片的宽度        int width=1124;        //压缩后的图片的高度        int height=768;     imageCompress(firpath, firpathname, laspathname, 0.5f,0.75f, width, height);}}
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