如何使用Java实现图片切割功能

这篇文章将为大家详细讲解有关如何使用Java实现图片切割功能，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。

具体内容如下

工具类

package com.xudaolong.Utils;import javax.imageio.IIOImage;import javax.imageio.ImageIO;import javax.imageio.ImageReader;import javax.imageio.ImageWriter;import javax.imageio.stream.ImageInputStream;import javax.imageio.stream.ImageOutputStream;import java.awt.*;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.util.Arrays;import java.util.Iterator;public class ImageCutterUtil {    public enum IMAGE_FORMAT {        BMP("bmp"),        JPG("jpg"),        WBMP("wbmp"),        JPEG("jpeg"),        PNG("png"),        GIF("gif");        private String value;        IMAGE_FORMAT(String value) {            this.value = value;        }        public String getValue() {            return value;        }        public void setValue(String value) {            this.value = value;        }    }        public static String getImageFormatName(File file) throws IOException {        String formatName = null;        ImageInputStream iis = ImageIO.createImageInputStream(file);        Iterator<ImageReader> imageReader = ImageIO.getImageReaders(iis);        if (imageReader.hasNext()) {            ImageReader reader = imageReader.next();            formatName = reader.getFormatName();        }        return formatName;    }            public static BufferedImage[] readerImage(File file) throws IOException {        BufferedImage sourceImage = ImageIO.read(file);        BufferedImage[] images = null;        ImageInputStream iis = ImageIO.createImageInputStream(file);        Iterator<ImageReader> imageReaders = ImageIO.getImageReaders(iis);        if (imageReaders.hasNext()) {            ImageReader reader = imageReaders.next();            reader.setInput(iis);            int imageNumber = reader.getNumImages(true);            images = new BufferedImage[imageNumber];            for (int i = 0; i < imageNumber; i++) {                BufferedImage image = reader.read(i);                if (sourceImage.getWidth() > image.getWidth() || sourceImage.getHeight() > image.getHeight()) {                    image = zoom(image, sourceImage.getWidth(), sourceImage.getHeight());                }                images[i] = image;            }            reader.dispose();            iis.close();        }        return images;    }        public static BufferedImage[] processImage(BufferedImage[] images, int x, int y, int width, int height) throws Exception {        if (null == images) {            return images;        }        BufferedImage[] oldImages = images;        images = new BufferedImage[images.length];        for (int i = 0; i < oldImages.length; i++) {            BufferedImage image = oldImages[i];            images[i] = image.getSubimage(x, y, width, height);        }        return images;    }        public static void writerImage(BufferedImage[] images, String formatName, File file) throws Exception {        Iterator<ImageWriter> imageWriters = ImageIO.getImageWritersByFormatName(formatName);        if (imageWriters.hasNext()) {            ImageWriter writer = imageWriters.next();            String fileName = file.getName();            int index = fileName.lastIndexOf(".");            if (index > 0) {                fileName = fileName.substring(0, index + 1) + formatName;            }            String pathPrefix = getFilePrefixPath(file.getPath());            File outFile = new File(pathPrefix + fileName);            ImageOutputStream iOS = ImageIO.createImageOutputStream(outFile);            writer.setOutput(ios);            if (writer.canWriteSequence()) {                writer.prepareWriteSequence(null);                for (int i = 0; i < images.length; i++) {                    BufferedImage childImage = images[i];                    IIOImage image = new IIOImage(childImage, null, null);                    writer.writeToSequence(image, null);                }                writer.endWriteSequence();            } else {                for (int i = 0; i < images.length; i++) {                    writer.write(images[i]);                }            }            writer.dispose();            ios.close();        }    }        public static void cutImage(File sourceFile, File destFile, int x, int y, int width, int height) throws Exception {        // 读取图片信息        BufferedImage[] images = readerImage(sourceFile);        // 处理图片        images = processImage(images, x, y, width, height);        // 获取文件后缀        String formatName = getImageFormatName(sourceFile);        destFile = new File(getPathWithoutSuffix(destFile.getPath()) + formatName);        // 写入处理后的图片到文件        writerImage(images, formatName, destFile);    }        public static void getOSSupportsStandardImageFormat() {        String[] readerFormatName = ImageIO.getReaderFormatNames();        String[] readerSuffixName = ImageIO.getReaderFileSuffixes();        String[] readerMIMEType = ImageIO.getReaderMIMETypes();        System.out.println("========================= OS supports reader ========================");        System.out.println("OS supports reader format name :  " + Arrays.asList(readerFormatName));        System.out.println("OS supports reader suffix name :  " + Arrays.asList(readerSuffixName));        System.out.println("OS supports reader MIME type :  " + Arrays.asList(readerMIMEType));        String[] writerFormatName = ImageIO.getWriterFormatNames();        String[] writerSuffixName = ImageIO.getWriterFileSuffixes();        String[] writerMIMEType = ImageIO.getWriterMIMETypes();        System.out.println("========================= OS supports writer ========================");        System.out.println("OS supports writer format name :  " + Arrays.asList(writerFormatName));        System.out.println("OS supports writer suffix name :  " + Arrays.asList(writerSuffixName));        System.out.println("OS supports writer MIME type :  " + Arrays.asList(writerMIMEType));    }        private static BufferedImage zoom(BufferedImage sourceImage, int width, int height) {        BufferedImage zoomImage = new BufferedImage(width, height, sourceImage.getType());        Image image = sourceImage.getScaledInstance(width, height, Image.SCALE_SMOOTH);        Graphics GC = zoomImage.getGraphics();        gc.setColor(Color.WHITE);        gc.drawImage(image, 0, 0, null);        return zoomImage;    }        public static String getFilePrefixPath(File file) throws IOException {        String path = null;        if (!file.exists()) {            throw new IOException("not found the file !");        }        String fileName = file.getName();        path = file.getPath().replace(fileName, "");        return path;    }        public static String getFilePrefixPath(String path) throws Exception {        if (null == path || path.isEmpty()) throw new Exception("文件路径为空！");        int index = path.lastIndexOf(File.separator);        if (index > 0) {            path = path.substring(0, index + 1);        }        return path;    }        public static String getPathWithoutSuffix(String src) {        String path = src;        int index = path.lastIndexOf(".");        if (index > 0) {            path = path.substring(0, index + 1);        }        return path;    }        public static String getFileName(String filePath) throws IOException {        File file = new File(filePath);        if (!file.exists()) {            throw new IOException("not found the file !");        }        return file.getName();    }        public static void main(String[] args) throws Exception {        // 获取系统支持的图片格式//        ImageCutterUtil.getOSSupportsStandardImageFormat();        try {            // 起始坐标，剪切大小            int x = 14;            int y = 24;            int width = 62;            int height = 62;            // 参考图像大小            int clientWidth = 88;            int clientHeight = 88;            File file = new File("/Users/Mac/ideaProjects/QRdemo/resources/src/com/xudaolong/QR/TestQR/QR.jpg");            BufferedImage image = ImageIO.read(file);            double destWidth = image.getWidth();            double destHeight = image.getHeight();            if (destWidth < width || destHeight < height)                throw new Exception("源图大小小于截取图片大小!");            double widthRatio = destWidth / clientWidth;            double heightRatio = destHeight / clientHeight;            x = Double.valueOf(x * widthRatio).intValue();            y = Double.valueOf(y * heightRatio).intValue();            width = Double.valueOf(width * widthRatio).intValue();            height = Double.valueOf(height * heightRatio).intValue();            System.out.println("裁剪大小  x:" + x + ",y:" + y + ",width:" + width + ",height:" + height);            String formatName = getImageFormatName(file);            String pathSuffix = "." + formatName;            String pathPrefix = getFilePrefixPath(file);            String targetPath = pathPrefix + System.currentTimeMillis() + pathSuffix;            File destFile = new File(targetPath);            ImageCutterUtil.cutImage(file, destFile, x, y, width, height);        } catch (IOException e) {            e.printStackTrace();        }    }}

单方面测试

public void cutQR(String sourcePath) {        try {            File file = new File(sourcePath);            BufferedImage image = ImageIO.read(file);            // 起始坐标，剪切大小            int x = 14;            int y = 25;            int width = 62;            int height = 62;            // 参考图像大小            int clientWidth = 88;            int clientHeight = 88;            double destWidth = image.getWidth();            double destHeight = image.getHeight();            if (destWidth < width || destHeight < height)                throw new Exception("源图大小小于截取图片大小!");            double widthRatio = destWidth / clientWidth;            double heightRatio = destHeight / clientHeight;            //修改一下单位            x = Double.valueOf(x * widthRatio).intValue();            y = Double.valueOf(y * heightRatio).intValue();            width = Double.valueOf(width * widthRatio).intValue();            height = Double.valueOf(height * heightRatio).intValue();            System.out.println("裁剪大小  x:" + x + ",y:" + y + ",width:" + width + ",height:" + height);            //获取指定的名字//            String formatName = getImageFormatName(file);//            String pathSuffix = "." + formatName;//            String pathPrefix = getFilePrefixPath(file);//            String targetPath = pathPrefix + System.currentTimeMillis() + pathSuffix;            //最后一步进行裁剪到指定的名字            File destFile = new File(sourcePath);            ImageCutterUtil.cutImage(file, destFile, x, y, width, height);        } catch (Exception e) {            e.printStackTrace();        }}

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