Java图片处理

Java图片处理 - 创建工具类

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Java原生代码实现工具类

Java原生代码实现使用jdk内部的GIFImageReader、GIFImageWriter等类，maven在编译的时候会提示这是sun公司的私有API，在1.7、1.8版的JDK中已经删除，所以是有风险的。

import com.oupeng.joke.domain.Image;import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGEncodeParam;import com.sun.image.codec.jpeg.JPEGImageEncoder;import com.sun.imageio.plugins.gif.GIFImageReader;import com.sun.imageio.plugins.gif.GIFImageReaderSpi;import com.sun.imageio.plugins.gif.GIFImageWriter;import com.sun.imageio.plugins.gif.GIFImageWriterSpi;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import javax.imageio.ImageIO;import javax.imageio.spi.ImageReaderSpi;import javax.imageio.spi.ImageWriterSpi;import javax.imageio.stream.FileImageInputStream;import javax.imageio.stream.FileImageOutputStream;import java.awt.image.BufferedImage;import java.io.*;import java.math.BigDecimal;public class ImageUtils {    private static final Logger log = LoggerFactory.getLogger(ImageUtils.class);//  public static void main(String[] args) {//        ImageUtils.getGifOneFrame("/nh/logs/c.gif", 5);//  }    /**     * 获取GIF图片一帧图片     * @param src       GIF图地址     * @param target    目标地址     * @param frame     第几帧     * @return     */    public static boolean getGifOneFrame(String src, String target, int frame) {        FileImageInputStream in = null;        FileImageOutputStream out = null;        try {            in = new FileImageInputStream(new File(src));            ImageReaderSpi readerSpi = new GIFImageReaderSpi();            GIFImageReader gifReader = (GIFImageReader) readerSpi.createReaderInstance();            gifReader.setInput(in);            int num = gifReader.getNumImages(true);            if (num > frame) {                ImageWriterSpi writerSpi = new GIFImageWriterSpi();                GIFImageWriter writer = (GIFImageWriter) writerSpi.createWriterInstance();                for (int i = 0; i < num; i++) {                    if (i == frame) {                        File newfile = new File(target);                        out = new FileImageOutputStream(newfile);                        writer.setOutput(out);                        writer.write(gifReader.read(i));                        return true;                    }                }            }            return false;        } catch (Exception e) {            log.error(e.getMessage(), e);            return false;        } finally {            close(in, out);        }    }    /**     * 复制文件     * @param src     * @param target     * @return     */    public static boolean copyImageToPath(String src, String target) {        InputStream in = null;        OutputStream out = null;        try {            File srcFile = new File(src);            File targetFile = new File(target);            in = new FileInputStream(srcFile);            out = new FileOutputStream(targetFile);            byte[] bytes = new byte[1024];            int len = -1;            while ((len = in.read(bytes)) != -1) {                out.write(bytes, 0, len);            }            return true;        } catch (Exception e) {            log.error(e.getMessage(), e);            return false;        } finally {            close(in, out);        }    }    /**     * 获取图片宽高     * @param file     * @return     */    public static void getImgWidthAndHeight(File file, Image image) {        InputStream is = null;        BufferedImage src ;        try {            if(image == null){                image = new Image();            }            is = new FileInputStream(file);            src = javax.imageio.ImageIO.read(is);            image.setWidth(src.getWidth());            image.setHeight(src.getHeight());        } catch (Exception e) {            log.error(e.getMessage(), e);        } finally {            close(is, null);        }    }    /**     * 获取图片宽高     * @param file     * @return     */    public static Image getImgWidthAndHeight(File file) {        InputStream is = null;        BufferedImage src ;        Image image = new Image();        try {            is = new FileInputStream(file);            src = javax.imageio.ImageIO.read(is);            image.setWidth(src.getWidth());            image.setHeight(src.getHeight());        } catch (Exception e) {            log.error(e.getMessage(), e);        } finally {            close(is, null);        }        return image;    }    /**     * 获取图片宽度     * @param file     * @return     */    public static int getImgWidth(File file) {        InputStream is = null;        BufferedImage src = null;        int ret = 0;        try {            is = new FileInputStream(file);            src = javax.imageio.ImageIO.read(is);            ret = src.getWidth(); // 得到源图宽        } catch (Exception e) {            log.error(e.getMessage(), e);        } finally {            close(is, null);        }        return ret;    }    /**     * 获取图片高度     * @param file  图片文件     * @return 高度     */    public static int getImgHeight(File file) {        InputStream is = null;        BufferedImage src;        int ret = 0;        try {            is = new FileInputStream(file);            src = javax.imageio.ImageIO.read(is);            ret = src.getHeight(); // 得到源图高        } catch (Exception e) {            log.error(e.getMessage(), e);        } finally {            close(is, null);        }        return ret;    }    /**     * 格式转换     * @param src     * @param target     * @param format     * @return     */    public static Image generateImage(String src, String target, String format, Image image) {        try {            if(image == null){                image = new Image();            }            File input = new File(src);            BufferedImage bim = ImageIO.read(input);            image.setWidth(bim.getWidth());            image.setHeight(bim.getHeight());            File output = new File(target);            ImageIO.write(bim, format, output);        } catch (IOException e) {            log.error(e.getMessage(), e);        }        return image;    }    /**     * 关闭资源     * @param in     * @param out     */    private static void close(Closeable in, Closeable out) {        try {            if (in != null) {                in.close();            }            if (out != null) {                out.close();            }        } catch (Exception e1) {            log.error(e1.getMessage(), e1);        }    }}    /**     * 缩放图片     * @param src     * @return     */    public static BufferedImage zoomImage(String src, int targetWidth) {        BufferedImage result = null;        try {            File srcfile = new File(src);            if (!srcfile.exists()) {                log.error("源文件不存在:{}", src);                return null;            }            BufferedImage im = ImageIO.read(srcfile);            /* 原始图像的宽度和高度 */            int width = im.getWidth();            int height = im.getHeight();            //压缩计算            float resizeTimes = (float)targetWidth / (float)width;            BigDecimal bd  =   new  BigDecimal((double)resizeTimes);            bd   =  bd.setScale(1 ,4); // (1:小数点位数, 2:表示四舍五入，可以选择其他舍值方式，例如去尾，等等.            resizeTimes   =  bd.floatValue();//            float resizeTimes = 0.3f;  /*这个参数是要转化成的倍数,如果是1就是转化成1倍*/            /* 调整后的图片的宽度和高度 */            int toWidth = (int) (width * resizeTimes);            int toHeight = (int) (height * resizeTimes);            /* 新生成结果图片 */            result = new BufferedImage(toWidth, toHeight, BufferedImage.TYPE_INT_RGB);            result.getGraphics().drawImage( im.getScaledInstance(toWidth, toHeight, java.awt.Image.SCALE_SMOOTH), 0, 0, null);        } catch (Exception e) {            System.out.println("创建缩略图发生异常" + e.getMessage());        }        return result;    }    public static boolean writeHighQuality(BufferedImage im, String fileFullPath) {        try {                /*输出到文件流*/            FileOutputStream newimage = new FileOutputStream(fileFullPath);            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(newimage);            JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(im);                /* 压缩质量 */            jep.setQuality(0.9f, true);            encoder.encode(im, jep);               /*近JPEG编码*/            newimage.close();            return true;        } catch (Exception e) {            return false;        }    }    public static boolean widthCutting(String source, String target, int width){        return ImageUtil.writeHighQuality(ImageUtil.zoomImage(source, width), target);    }

上面的工具类中使用了Image对象

public class Image {    /**     * 宽度     */    private Integer width;    /**     * 高度     */    private Integer height;    /**     * 路径     */    private String path;    public Integer getWidth() {        return width;    }    public void setWidth(Integer width) {        this.width = width;    }    public Integer getHeight() {        return height;    }    public void setHeight(Integer height) {        this.height = height;    }    public String getPath() {        return path;    }    public void setPath(String path) {        this.path = path;    }}

使用第三方im4java库创建工具类

第一步，需要在项目中加入im4java的Maven依赖

        <dependency>            <groupId>org.im4java</groupId>            <artifactId>im4java</artifactId>            <version>1.4.0</version>        </dependency>

第二步， 创建工具类

import org.im4java.core.ConvertCmd;import org.im4java.core.IMOperation;import org.im4java.core.IdentifyCmd;import org.im4java.core.ImageCommand;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import java.io.File;import java.util.ArrayList;import java.util.List;public class Im4JavaUtils {    private static final Logger logger = LoggerFactory.getLogger(Im4JavaUtils.class);    /** 是否使用 GraphicsMagick (Windows下为true) **/    private static final boolean USE_GRAPHICS_MAGICK_PATH = false;    /** ImageMagick 安装目录 **/    private static final String IMAGE_MAGICK_PATH = "C:\\Program Files\\ImageMagick-6.3.9-Q8";    /** GraphicsMagick 安装目录 **/    private static final String GRAPHICS_MAGICK_PATH = "C:\\Program Files\\GraphicsMagick-1.3.23-Q8";    /**     * 获取 ImageCommand     * @param comm 命令类型（convert, identify）     * @return     */    private static ImageCommand getImageCommand(String comm) {        ImageCommand cmd = null;        if ("convert".equalsIgnoreCase(comm)) {            cmd = new ConvertCmd(USE_GRAPHICS_MAGICK_PATH);        } else if ("identify".equalsIgnoreCase(comm)) {            cmd = new IdentifyCmd(USE_GRAPHICS_MAGICK_PATH);        } // else if....//        Windows环境下需要配置应用路径        if (cmd != null && System.getProperty("os.name").toLowerCase().indexOf("windows") != -1) {            cmd.setSearchPath(USE_GRAPHICS_MAGICK_PATH ? GRAPHICS_MAGICK_PATH : IMAGE_MAGICK_PATH);        }        return cmd;    }    /**     * 降低品质，以减小文件大小     * @param path 原文件路径     * @param des 目标文件路径     * @param quality 保留品质（1-100）     * @throws Exception     */    public static void reduceQuality(String path, String des, double quality) throws Exception {        createDirectory(des);        IMOperation op = new IMOperation();        op.addImage(path);        op.quality(quality);        op.addImage(des);        ConvertCmd cmd = (ConvertCmd) getImageCommand("convert");        cmd.run(op);    }    /**     * 改变图片大小比例     * @param path 原文件路径     * @param des 目标文件路径     * @param ratio 缩放比例     * @throws Exception     */    public static void resizeImage(String path, String des, String ratio) throws Exception {//        创建目标文件        createDirectory(des);        IMOperation op = new IMOperation();        op.addImage(path);        op.addRawArgs(ratio);        op.addImage(des);        ConvertCmd cmd = (ConvertCmd) getImageCommand("convert");        cmd.run(op);    }    /**     * 等比缩放图片（如果width为空，则按height缩放; 如果height为空，则按width缩放）     * @param path 原文件路径     * @param des 目标文件路径     * @param width 缩放后的宽度     * @param height 缩放后的高度     * @param sample 是否以缩放方式，而非缩略图方式     * @throws Exception      */    public static void scaleResizeImage(String path, String des, Integer width, Integer height, boolean sample) throws Exception {        createDirectory(des);        IMOperation op = new IMOperation();        op.addImage(path);        if (sample) op.resize(width, height);        else op.sample(width, height);        op.addImage(des);        ConvertCmd cmd = (ConvertCmd) getImageCommand("convert");        cmd.run(op);    }    /**     * 从原图中裁剪出新图     * @param path 原文件路径     * @param des 目标文件路径     * @param x 原图左上角     * @param y 原图左上角     * @param width 新图片宽度     * @param height 新图片高度     * @throws Exception     */    public static void cropImage(String path, String des, int x, int y, int width, int height) throws Exception {        createDirectory(des);        IMOperation op = new IMOperation();        op.addImage(path);        op.crop(width, height, x, y);        op.addImage(des);        ConvertCmd cmd = (ConvertCmd) getImageCommand("convert");        cmd.run(op);    }    /**     * 将图片分割为若干小图     * @param path 原文件路径     * @param des 目标文件路径     * @param width 指定宽度（默认为完整宽度）     * @param height 指定高度（默认为完整高度）     * @return 小图路径     * @throws Exception     */    public static List<String> subsectionImage(String path, String des, Integer width, Integer height) throws Exception {        createDirectory(des);        IMOperation op = new IMOperation();        op.addImage(path);        op.crop(width, height);        op.addImage(des);        ConvertCmd cmd = (ConvertCmd) getImageCommand("convert");        cmd.run(op);        return getSubImages(des);    }    /**     * <pre>     * <li>去除Exif信息</li>     * <li>按指定的宽度等比缩放图片</li>     * <li>降低图片品质</li>     * <li>将图片分割分指定高度的小图</li>     *     * @param path 原文件路径     * @param des 目标文件路径     * @param width 指定宽度     * @param subImageHeight 指定高度     * @param quality 保留品质     * @return 小图路径     * @throws Exception     * </pre>     */    public static List<String> resizeAndCropImage(String path, String des, int width, int subImageHeight, double quality) throws Exception {        createDirectory(des);        IMOperation op = new IMOperation();        op.addImage(path);//        op.profile("*");        op.resize(width, null);        op.quality(quality);        op.crop(null, subImageHeight);        op.addImage(des);        ConvertCmd cmd = (ConvertCmd) getImageCommand("convert");        cmd.run(op);        return getSubImages(des);    }    /***     * 切图     * @param source path       源图片路径     * @param target            目标图片路径     * @param width             限宽     * @param subImageHeight    最终高度     * @param quality           图片质量(0~100)     * @throws Exception     */    public static void cropImage(String source, String target, int width, int subImageHeight, double quality) throws Exception {        createDirectory(target);        IMOperation op = new IMOperation();        op.addImage(source);        op.resize(width, null);        op.quality(quality);        op.crop(null, subImageHeight, 0, 15);        op.addImage(target);        ConvertCmd cmd = (ConvertCmd) getImageCommand("convert");        cmd.run(op);    }    /**     * 拷贝图片 - 同步     * @param source     * @param target     * @return     * @throws Exception     */    public static boolean copyImage(String source, String target) throws Exception {        createDirectory(target);        IMOperation op = new IMOperation();        op.addImage(source);        op.addImage(target);        ConvertCmd cmd = (ConvertCmd) getImageCommand("convert");        cmd.setAsyncMode(false);        cmd.run(op);        return true;    }    /**     * 拷贝图片 - 异步     * @param source     * @param target     * @return     * @throws Exception     */    public static void copyImageAsync(String source, String target) throws Exception {        createDirectory(target);        IMOperation op = new IMOperation();        op.addImage(source);        op.addImage(target);        ConvertCmd cmd = (ConvertCmd) getImageCommand("convert");        cmd.setAsyncMode(true);        cmd.run(op);    }    /**     * 创建目录     * @param path     */    private static void createDirectory(String path) {        File file = new File(path);        if (file.exists()){            return;        }        file.getParentFile().mkdirs();    }    /**     * 获取图片分割后的小图路径     * @param des 目录路径     * @return 小图路径     */    private static List<String> getSubImages(String des) {        String fileDir = des.substring(0, des.lastIndexOf(File.separatorChar)); // 文件所在目录        String fileName = des.substring(des.lastIndexOf(File.separatorChar) + 1); // 文件名称        String n1 = fileName.substring(0, fileName.lastIndexOf(".")); // 文件名（无后缀）         String n2 = fileName.replace(n1, ""); // 后缀        List<String> fileList = new ArrayList<String>();        String path = null;        for (int i = 0;; i++) {            path = fileDir + File.separatorChar + n1 + "-" + i + n2;            if (new File(path).exists()) fileList.add(path);            else break;        }        return fileList;    }    /**     * 获取GIF图片一帧图片 - 同步执行     * @param src     * @param target     * @param frame     * @throws Exception     */    public static boolean getGifOneFrame(String src, String target, int frame) throws Exception {        if(!src.endsWith(".gif")){            return false;        }        createDirectory(target);        IMOperation op = new IMOperation();        op.addImage(src + "["+frame+"]");        op.addImage(target);        ConvertCmd cmd = (ConvertCmd) getImageCommand("convert");        cmd.setAsyncMode(false);        cmd.run(op);        return true;    }    /**     * 获取GIF图片一帧图片 - 异步执行     * @param src     * @param target     * @param frame     * @throws Exception     */    public static void getGifOneFrameAsync(String src, String target, int frame) throws Exception {        if(!src.endsWith(".gif")){            return;        }        createDirectory(target);        IMOperation op = new IMOperation();        op.addImage(src + "["+frame+"]");        op.addImage(target);        ConvertCmd cmd = (ConvertCmd) getImageCommand("convert");        cmd.setAsyncMode(true);        cmd.run(op);    }    public static void main(String[] args) throws Exception {        String src = "C:\\img\\2.jpg";        String target = "C:\\img\\3.jpg";        copyImage(src, target);        logger.info("处理完成");    }}

大家还可以参考我专栏中的其他文章：
（1）Java图片处理 - 安装ImageMagick库使用convert命令
（2）Java图片处理 - 创建工具类
（3）Java图片处理 - 复制
（4）Java图片处理 - 缩放图片
（5）Java图片处理 - gif图获取一帧图片