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 Iteratorwriters = 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); } } }