图片处理工具类

纯JAVA实现的图片处理工具类，提供图片的裁剪、压缩、获取尺寸、制作圆角等方法。

源码如下：(点击下载 -ImageUtils.java 、FolderUtils.java 、commons-io-2.4.jar、commons-lang-2.6.jar)

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.util.Iterator;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.stream.ImageOutputStream;
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;

/**
 * 纯JAVA实现的图片处理工具类
 * 
 */
public class ImageUtils {

    /**
     * 获取图片尺寸信息
     * 
     * @param filePath
     *            a {@link java.lang.String} object.
     * @return [width, height]
     */
    public static int[] getSizeInfo(String filePath) throws Exception {
        File file = new File(filePath);
        return getSizeInfo(file);
    }

    /**
     * 获取图片尺寸信息
     * 
     * @param url
     *            a {@link java.net.URL} object.
     * @return [width,height]
     */
    public static int[] getSizeInfo(URL url) throws Exception {
        InputStream input = null;
        try {
            input = url.openStream();
            return getSizeInfo(input);
        } catch (IOException e) {
            e.printStackTrace();
            throw new Exception(e);
        } finally {
            IOUtils.closeQuietly(input);
        }
    }

    /**
     * 获取图片尺寸信息
     * 
     * @param file
     *            a {@link java.io.File} object.
     * @return [width,height]
     */
    public static int[] getSizeInfo(File file) throws Exception {
        if (!file.exists()) {
            throw new Exception("file " + file.getAbsolutePath() + " doesn't exist.");
        }
        BufferedInputStream input = null;
        try {
            input = new BufferedInputStream(new FileInputStream(file));
            return getSizeInfo(input);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            throw new Exception(e);
        } finally {
            IOUtils.closeQuietly(input);
        }
    }

    /**
     * 获取图片尺寸
     * 
     * @param input
     *            a {@link java.io.InputStream} object.
     * @return [width,height]
     */
    public static int[] getSizeInfo(InputStream input) throws Exception {
        try {
            BufferedImage img = ImageIO.read(input);
            int w = img.getWidth(null);
            int h = img.getHeight(null);
            return new int[] { w, h };
        } catch (IOException e) {
            e.printStackTrace();
            throw new Exception(e);
        }
    }

    /**
     * 重调图片尺寸
     * 
     * @param srcFilePath
     *            原图路径
     * @param destFile
     *            目标文件
     * @param width
     *            新的宽度，小于1则忽略，按原图比例缩放
     * @param height
     *            新的高度，小于1则忽略，按原图比例缩放
     */
    public static void resize(String srcFilePath, String destFile, int width, int height) throws Exception {
        resize(srcFilePath, destFile, width, height, -1, -1);
    }

    /**
     * 重调图片尺寸
     * 
     * @param input
     *            a {@link java.io.InputStream} object.
     * @param output
     *            a {@link java.io.OutputStream} object.
     * @param width
     *            a int.
     * @param height
     *            a int.
     */
    public static void resize(InputStream input, OutputStream output, int width, int height) throws Exception {
        resize(input, output, width, height, -1, -1);
    }

    /**
     * 重调图片尺寸
     * 
     * @param input
     *            a {@link java.io.InputStream} object.
     * @param output
     *            a {@link java.io.OutputStream} object.
     * @param width
     *            a int.
     * @param height
     *            a int.
     * @param maxWidth
     *            a int.
     * @param maxHeight
     *            a int.
     */
    public static void resize(InputStream input, OutputStream output,
            int width, int height, int maxWidth, int maxHeight) throws Exception {

        if (width < 1 && height < 1 && maxWidth < 1 && maxHeight < 1) {
            try {
                IOUtils.copy(input, output);
            } catch (IOException e) {
                throw new Exception("resize error: ", e);
            }
        }
        try {
            BufferedImage img = ImageIO.read(input);
            boolean hasNotAlpha = !img.getColorModel().hasAlpha();
            double w = img.getWidth(null);
            double h = img.getHeight(null);
            int toWidth;
            int toHeight;
            double rate = w / h;

            if (width > 0 && height > 0) {
                rate = ((double) width) / ((double) height);
                toWidth = width;
                toHeight = height;
            } else if (width > 0) {
                toWidth = width;
                toHeight = (int) (toWidth / rate);
            } else if (height > 0) {
                toHeight = height;
                toWidth = (int) (toHeight * rate);
            } else {
                toWidth = ((Number) w).intValue();
                toHeight = ((Number) h).intValue();
            }

            if (maxWidth > 0 && toWidth > maxWidth) {
                toWidth = maxWidth;
                toHeight = (int) (toWidth / rate);
            }
            if (maxHeight > 0 && toHeight > maxHeight) {
                toHeight = maxHeight;
                toWidth = (int) (toHeight * rate);
            }

            BufferedImage tag = new BufferedImage(toWidth, toHeight, hasNotAlpha ? BufferedImage.TYPE_INT_RGB : BufferedImage.TYPE_INT_ARGB);

            // Image.SCALE_SMOOTH 的缩略算法 生成缩略图片的平滑度的 优先级比速度高 生成的图片质量比较好 但速度慢
            tag.getGraphics().drawImage(img.getScaledInstance(toWidth, toHeight, Image.SCALE_SMOOTH), 0, 0, null);
            ImageIO.write(tag, hasNotAlpha ? "jpg" : "png", output);
        } catch (Exception e) {
            e.printStackTrace();
            throw new Exception(e);
        } finally {
            IOUtils.closeQuietly(input);
            IOUtils.closeQuietly(output);
        }

    }

    /**
     * 重调图片尺寸
     * 
     * @param srcFile
     *            原图路径
     * @param destFile
     *            目标文件
     * @param width
     *            新的宽度，小于1则忽略，按原图比例缩放
     * @param height
     *            新的高度，小于1则忽略，按原图比例缩放
     * @param maxWidth
     *            最大宽度，限制目标图片宽度，小于1则忽略此设置
     * @param maxHeight
     *            最大高度，限制目标图片高度，小于1则忽略此设置
     */
    public static void resize(String srcFile, String destFile, int width,
            int height, int maxWidth, int maxHeight) throws Exception {
        resize(new File(srcFile), new File(destFile), width, height, maxWidth, maxHeight);
    }

    /**
     * 重调图片尺寸
     * 
     * @param srcFile
     *            原图路径
     * @param destFile
     *            目标文件
     * @param width
     *            新的宽度，小于1则忽略，按原图比例缩放
     * @param height
     *            新的高度，小于1则忽略，按原图比例缩放
     */
    public static void resize(File srcFile, File destFile, int width, int height) throws Exception {
        resize(srcFile, destFile, width, height, -1, -1);
    }

    /**
     * 重调图片尺寸
     * 
     * @param srcFile
     *            原图路径
     * @param destFile
     *            目标文件
     * @param width
     *            新的宽度，小于1则忽略，按原图比例缩放
     * @param height
     *            新的高度，小于1则忽略，按原图比例缩放
     * @param maxWidth
     *            最大宽度，限制目标图片宽度，小于1则忽略此设置
     * @param maxHeight
     *            最大高度，限制目标图片高度，小于1则忽略此设置
     */
    public static void resize(File srcFile, File destFile, int width,
            int height, int maxWidth, int maxHeight) throws Exception {
        if (destFile.exists()) {
            destFile.delete();
        } else {
            FolderUtils.mkdirs(destFile.getParent());
        }
        InputStream input = null;
        OutputStream output = null;
        try {
            input = new BufferedInputStream(new FileInputStream(srcFile));
            output = new FileOutputStream(destFile);
            resize(input, output, width, height, maxWidth, maxHeight);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            throw new Exception(e);
        } finally {
            IOUtils.closeQuietly(input);
            IOUtils.closeQuietly(output);
        }
    }

    /**
     * 裁剪图片
     * 
     * @param source
     *            a {@link java.lang.String} object.
     * @param target
     *            a {@link java.lang.String} object.
     * @param x
     *            a int.
     * @param y
     *            a int.
     * @param w
     *            a int.
     * @param h
     *            a int.
     */
    public static void crop(String source, String target, int x, int y, int w, int h) throws Exception {
        crop(new File(source), new File(target), x, y, w, h);
    }

    /**
     * 裁剪图片
     * 
     * @param source
     *            a {@link java.io.File} object.
     * @param target
     *            a {@link java.io.File} object.
     * @param x
     *            a int.
     * @param y
     *            a int.
     * @param w
     *            a int.
     * @param h
     *            a int.
     */
    public static void crop(File source, File target, int x, int y, int w, int h) throws Exception {
        OutputStream output = null;
        InputStream input = null;
        String ext = FilenameUtils.getExtension(target.getName());
        try {
            input = new BufferedInputStream(new FileInputStream(source));
            if (target.exists()) {
                target.delete();
            } else {
                FolderUtils.mkdirs(target.getParent());
            }
            output = new BufferedOutputStream(new FileOutputStream(target));
        } catch (IOException e) {
            throw new Exception(e);
        }
        crop(input, output, x, y, w, h, StringUtils.equalsIgnoreCase("png", ext));
    }

    /**
     * 裁剪图片
     * 
     * @param x
     *            a int.
     * @param y
     *            a int.
     * @param w
     *            a int.
     * @param h
     *            a int.
     * @param input
     *            a {@link java.io.InputStream} object.
     * @param output
     *            a {@link java.io.OutputStream} object.
     * @param isPNG
     *            a boolean.
     */
    public static void crop(InputStream input, OutputStream output, int x,
            int y, int w, int h, boolean isPNG) throws Exception {
        try {
            BufferedImage srcImg = ImageIO.read(input);
            int tmpWidth = srcImg.getWidth();
            int tmpHeight = srcImg.getHeight();
            int xx = Math.min(tmpWidth - 1, x);
            int yy = Math.min(tmpHeight - 1, y);

            int ww = w;
            if (xx + w > tmpWidth) {
                ww = Math.max(1, tmpWidth - xx);
            }
            int hh = h;
            if (yy + h > tmpHeight) {
                hh = Math.max(1, tmpHeight - yy);
            }

            BufferedImage dest = srcImg.getSubimage(xx, yy, ww, hh);

            BufferedImage tag = new BufferedImage(w, h, isPNG ? BufferedImage.TYPE_INT_ARGB : BufferedImage.TYPE_INT_RGB);

            tag.getGraphics().drawImage(dest, 0, 0, null);
            ImageIO.write(tag, isPNG ? "png" : "jpg", output);
        } catch (Exception e) {
            e.printStackTrace();
            throw new Exception(e);
        } finally {
            IOUtils.closeQuietly(input);
            IOUtils.closeQuietly(output);
        }
    }

    /**
     * 压缩图片,PNG图片按JPG处理
     * 
     * @param input
     *            a {@link java.io.InputStream} object.
     * @param output
     *            a {@link java.io.OutputStream} object.
     * @param quality
     *            图片质量0-1之间
     */
    public static final void optimize(InputStream input, OutputStream output, float quality) throws Exception {

        // create a BufferedImage as the result of decoding the supplied
        // InputStream
        BufferedImage image;
        ImageOutputStream ios = null;
        ImageWriter writer = null;
        try {
            image = ImageIO.read(input);

            // get all image writers for JPG format
            Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpeg");

            if (!writers.hasNext())
                throw new IllegalStateException("No writers found");

            writer = (ImageWriter) writers.next();
            ios = ImageIO.createImageOutputStream(output);

            writer.setOutput(ios);

            ImageWriteParam param = writer.getDefaultWriteParam();

            // optimize to a given quality
            param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
            param.setCompressionQuality(quality);

            // appends a complete image stream containing a single image and
            // associated stream and image metadata and thumbnails to the output
            writer.write(null, new IIOImage(image, null, null), param);
        } catch (IOException e) {
            e.printStackTrace();
            throw new Exception(e);
        } finally {
            if (ios != null) {
                try {
                    ios.close();
                } catch (IOException e) {
                    e.printStackTrace();
                    throw new Exception(e);
                }
            }
            writer.dispose();
        }
    }

    /**
     * 压缩图片
     * 
     * @param source
     *            a {@link java.lang.String} object.
     * @param target
     *            a {@link java.lang.String} object.
     * @param quality
     *            a float.
     */
    public static final void optimize(String source, String target, float quality) throws Exception {
        File fromFile = new File(source);
        File toFile = new File(target);
        optimize(fromFile, toFile, quality);
    }

    /**
     * 压缩图片
     * 
     * @param source
     *            a {@link java.io.File} object.
     * @param target
     *            a {@link java.io.File} object.
     * @param quality
     *            图片质量0-1之间
     */
    public static final void optimize(File source, File target, float quality) throws Exception {
        if (target.exists()) {
            target.delete();
        } else {
            FolderUtils.mkdirs(target.getParent());
        }
        InputStream is = null;
        OutputStream os = null;
        try {
            is = new BufferedInputStream(new FileInputStream(source));
            os = new BufferedOutputStream(new FileOutputStream(target));
            optimize(is, os, quality);
        } catch (FileNotFoundException e) {
            throw new Exception(e);
        } finally {
            IOUtils.closeQuietly(is);
            IOUtils.closeQuietly(os);
        }
    }

    /**
     * 制作圆角
     * 
     * @param srcFile
     *            原文件
     * @param destFile
     *            目标文件
     * @param cornerRadius
     *            角度
     */
    public static void makeRoundedCorner(File srcFile, File destFile, int cornerRadius) throws Exception {
        InputStream in = null;
        OutputStream out = null;

        try {
            in = new BufferedInputStream(new FileInputStream(srcFile));
            FolderUtils.mkdirs(destFile.getParentFile().getAbsolutePath());
            out = new BufferedOutputStream(new FileOutputStream(destFile));
            makeRoundedCorner(in, out, cornerRadius);
        } catch (IOException e) {
            e.printStackTrace();
            throw new Exception(e);
        } finally {
            IOUtils.closeQuietly(out);
            IOUtils.closeQuietly(in);
        }

    }

    /**
     * 制作圆角
     * 
     * @param srcFile
     *            原文件
     * @param destFile
     *            目标文件
     * @param cornerRadius
     *            角度
     */
    public static void makeRoundedCorner(String srcFile, String destFile, int cornerRadius) throws Exception {
        makeRoundedCorner(new File(srcFile), new File(destFile), cornerRadius);
    }

    /**
     * 制作圆角
     * 
     * @param inputStream
     *            原图输入流
     * @param outputStream
     *            目标输出流
     * @param radius
     *            角度
     */
    public static void makeRoundedCorner(final InputStream inputStream,
            final OutputStream outputStream, final int radius) throws Exception {
        BufferedImage sourceImage = null;
        BufferedImage targetImage = null;
        try {
            sourceImage = ImageIO.read(inputStream);
            int w = sourceImage.getWidth();
            int h = sourceImage.getHeight();
            System.out.println(w);

            int cornerRadius = radius < 1 ? w / 4 : radius;

            targetImage = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);

            Graphics2D g2 = targetImage.createGraphics();

            // This is what we want, but it only does hard-clipping, i.e.
            // aliasing
            // g2.setClip(new RoundRectangle2D ...)

            // so instead fake soft-clipping by first drawing the desired clip
            // shape
            // in fully opaque white with antialiasing enabled...
            g2.setComposite(AlphaComposite.Src);
            g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g2.setColor(Color.WHITE);
            g2.fill(new RoundRectangle2D.Float(0, 0, w, h, cornerRadius, cornerRadius));

            // ... then compositing the image on top,
            // using the white shape from above as alpha source
            g2.setComposite(AlphaComposite.SrcAtop);
            g2.drawImage(sourceImage, 0, 0, null);
            g2.dispose();
            ImageIO.write(targetImage, "png", outputStream);
        } catch (IOException e) {
            e.printStackTrace();
            throw new Exception(e);
        }
    }

}