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這篇文章將為大家詳細(xì)講解有關(guān)如何使用Java實(shí)現(xiàn)圖片切割功能,小編覺(jué)得挺實(shí)用的,因此分享給大家做個(gè)參考,希望大家閱讀完這篇文章后可以有所收獲。
具體內(nèi)容如下
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; /** * 圖像裁剪以及壓縮處理工具類 * <p> * 主要針對(duì)動(dòng)態(tài)的GIF格式圖片裁剪之后,只出現(xiàn)一幀動(dòng)態(tài)效果的現(xiàn)象提供解決方案 * <p> * 提供依賴三方包解決方案(針對(duì)GIF格式數(shù)據(jù)特征一一解析,進(jìn)行編碼解碼操作) * 提供基于JDK Image I/O 的解決方案(JDK探索失敗) */ 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; } } /** * 獲取圖片格式 * * @param file 圖片文件 * @return 圖片格式 */ 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; } /*********************** 基于JDK 解決方案 ********************************/ /** * 讀取圖片 * * @param file 圖片文件 * @return 圖片數(shù)據(jù) * @throws IOException */ 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; } /** * 根據(jù)要求處理圖片 * * @param images 圖片數(shù)組 * @param x 橫向起始位置 * @param y 縱向起始位置 * @param width 寬度 * @param height 寬度 * @return 處理后的圖片數(shù)組 * @throws Exception */ 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; } /** * 寫入處理后的圖片到file * <p> * 圖片后綴根據(jù)圖片格式生成 * * @param images 處理后的圖片數(shù)據(jù) * @param formatName 圖片格式 * @param file 寫入文件對(duì)象 * @throws Exception */ 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(); } } /** * 剪切格式圖片 * <p> * 基于JDK Image I/O解決方案 * * @param sourceFile 待剪切圖片文件對(duì)象 * @param destFile 裁剪后保存文件對(duì)象 * @param x 剪切橫向起始位置 * @param y 剪切縱向起始位置 * @param width 剪切寬度 * @param height 剪切寬度 * @throws Exception */ public static void cutImage(File sourceFile, File destFile, int x, int y, int width, int height) throws Exception { // 讀取圖片信息 BufferedImage[] images = readerImage(sourceFile); // 處理圖片 images = processImage(images, x, y, width, height); // 獲取文件后綴 String formatName = getImageFormatName(sourceFile); destFile = new File(getPathWithoutSuffix(destFile.getPath()) + formatName); // 寫入處理后的圖片到文件 writerImage(images, formatName, destFile); } /** * 獲取系統(tǒng)支持的圖片格式 */ 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)); } /** * 壓縮圖片 * * @param sourceImage 待壓縮圖片 * @param width 壓縮圖片高度 * @param height 壓縮圖片寬度 */ 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; } /** * 獲取某個(gè)文件的前綴路徑 * <p> * 不包含文件名的路徑 * * @param file 當(dāng)前文件對(duì)象 * @return * @throws IOException */ 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; } /** * 獲取某個(gè)文件的前綴路徑 * <p> * 不包含文件名的路徑 * * @param path 當(dāng)前文件路徑 * @return 不包含文件名的路徑 * @throws Exception */ public static String getFilePrefixPath(String path) throws Exception { if (null == path || path.isEmpty()) throw new Exception("文件路徑為空!"); int index = path.lastIndexOf(File.separator); if (index > 0) { path = path.substring(0, index + 1); } return path; } /** * 獲取不包含后綴的文件路徑 * * @param src * @return */ public static String getPathWithoutSuffix(String src) { String path = src; int index = path.lastIndexOf("."); if (index > 0) { path = path.substring(0, index + 1); } return path; } /** * 獲取文件名 * * @param filePath 文件路徑 * @return 文件名 * @throws IOException */ 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(); } /** * @param args * @throws Exception */ public static void main(String[] args) throws Exception { // 獲取系統(tǒng)支持的圖片格式 // ImageCutterUtil.getOSSupportsStandardImageFormat(); try { // 起始坐標(biāo),剪切大小 int x = 14; int y = 24; int width = 62; int height = 62; // 參考圖像大小 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("源圖大小小于截取圖片大小!"); 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(); } } }
public void cutQR(String sourcePath) { try { File file = new File(sourcePath); BufferedImage image = ImageIO.read(file); // 起始坐標(biāo),剪切大小 int x = 14; int y = 25; int width = 62; int height = 62; // 參考圖像大小 int clientWidth = 88; int clientHeight = 88; double destWidth = image.getWidth(); double destHeight = image.getHeight(); if (destWidth < width || destHeight < height) throw new Exception("源圖大小小于截取圖片大小!"); double widthRatio = destWidth / clientWidth; double heightRatio = destHeight / clientHeight; //修改一下單位 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); //獲取指定的名字 // String formatName = getImageFormatName(file); // String pathSuffix = "." + formatName; // String pathPrefix = getFilePrefixPath(file); // String targetPath = pathPrefix + System.currentTimeMillis() + pathSuffix; //最后一步進(jìn)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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