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)
1 import java.awt.AlphaComposite; 2 import java.awt.Color; 3 import java.awt.Graphics2D; 4 import java.awt.Image; 5 import java.awt.RenderingHints; 6 import java.awt.geom.RoundRectangle2D; 7 import java.awt.image.BufferedImage; 8 import java.io.BufferedInputStream; 9 import java.io.BufferedOutputStream; 10 import java.io.File; 11 import java.io.FileInputStream; 12 import java.io.FileNotFoundException; 13 import java.io.FileOutputStream; 14 import java.io.IOException; 15 import java.io.InputStream; 16 import java.io.OutputStream; 17 import .URL; 18 import java.util.Iterator; 19 import javax.imageio.IIOImage; 20 import javax.imageio.ImageIO; 21 import javax.imageio.ImageWriteParam; 22 import javax.imageio.ImageWriter; 23 import javax.imageio.stream.ImageOutputStream; 24 import mons.io.FilenameUtils; 25 import mons.io.IOUtils; 26 import mons.lang.StringUtils; 27 28 /** 29 * 纯JAVA实现的图片处理工具类 30 * 31 */ 32 public class ImageUtils { 33 34/** 35* 获取图片尺寸信息 36* 37* @param filePath 38* a {@link java.lang.String} object. 39* @return [width, height] 40*/ 41public static int[] getSizeInfo(String filePath) throws Exception { 42 File file = new File(filePath); 43 return getSizeInfo(file); 44} 45 46/** 47* 获取图片尺寸信息 48* 49* @param url 50* a {@link .URL} object. 51* @return [width,height] 52*/ 53public static int[] getSizeInfo(URL url) throws Exception { 54 InputStream input = null; 55 try { 56 input = url.openStream(); 57 return getSizeInfo(input); 58 } catch (IOException e) { 59 e.printStackTrace(); 60 throw new Exception(e); 61 } finally { 62 IOUtils.closeQuietly(input); 63 } 64} 65 66/** 67* 获取图片尺寸信息 68* 69* @param file 70* a {@link java.io.File} object. 71* @return [width,height] 72*/ 73public static int[] getSizeInfo(File file) throws Exception { 74 if (!file.exists()) { 75 throw new Exception("file " + file.getAbsolutePath() + " doesn't exist."); 76 } 77 BufferedInputStream input = null; 78 try { 79 input = new BufferedInputStream(new FileInputStream(file)); 80 return getSizeInfo(input); 81 } catch (FileNotFoundException e) { 82 e.printStackTrace(); 83 throw new Exception(e); 84 } finally { 85 IOUtils.closeQuietly(input); 86 } 87} 88 89/** 90* 获取图片尺寸 91* 92* @param input 93* a {@link java.io.InputStream} object. 94* @return [width,height] 95*/ 96public static int[] getSizeInfo(InputStream input) throws Exception { 97 try { 98 BufferedImage img = ImageIO.read(input); 99 int w = img.getWidth(null);100 int h = img.getHeight(null);101 return new int[] { w, h };102 } catch (IOException e) {103 e.printStackTrace();104 throw new Exception(e);105 }106}107 108/**109* 重调图片尺寸110* 111* @param srcFilePath112* 原图路径113* @param destFile114* 目标文件115* @param width116* 新的宽度，小于1则忽略，按原图比例缩放117* @param height118* 新的高度，小于1则忽略，按原图比例缩放119*/120public static void resize(String srcFilePath, String destFile, int width, int height) throws Exception {121 resize(srcFilePath, destFile, width, height, -1, -1);122}123 124/**125* 重调图片尺寸126* 127* @param input128* a {@link java.io.InputStream} object.129* @param output130* a {@link java.io.OutputStream} object.131* @param width132* a int.133* @param height134* a int.135*/136public static void resize(InputStream input, OutputStream output, int width, int height) throws Exception {137 resize(input, output, width, height, -1, -1);138}139 140/**141* 重调图片尺寸142* 143* @param input144* a {@link java.io.InputStream} object.145* @param output146* a {@link java.io.OutputStream} object.147* @param width148* a int.149* @param height150* a int.151* @param maxWidth152* a int.153* @param maxHeight154* a int.155*/156public static void resize(InputStream input, OutputStream output,157 int width, int height, int maxWidth, int maxHeight) throws Exception {158 159 if (width < 1 && height < 1 && maxWidth < 1 && maxHeight < 1) {160 try {161 IOUtils.copy(input, output);162 } catch (IOException e) {163 throw new Exception("resize error: ", e);164 }165 }166 try {167 BufferedImage img = ImageIO.read(input);168 boolean hasNotAlpha = !img.getColorModel().hasAlpha();169 double w = img.getWidth(null);170 double h = img.getHeight(null);171 int toWidth;172 int toHeight;173 double rate = w / h;174 175 if (width > 0 && height > 0) {176 rate = ((double) width) / ((double) height);177 toWidth = width;178 toHeight = height;179 } else if (width > 0) {180 toWidth = width;181 toHeight = (int) (toWidth / rate);182 } else if (height > 0) {183 toHeight = height;184 toWidth = (int) (toHeight * rate);185 } else {186 toWidth = ((Number) w).intValue();187 toHeight = ((Number) h).intValue();188 }189 190 if (maxWidth > 0 && toWidth > maxWidth) {191 toWidth = maxWidth;192 toHeight = (int) (toWidth / rate);193 }194 if (maxHeight > 0 && toHeight > maxHeight) {195 toHeight = maxHeight;196 toWidth = (int) (toHeight * rate);197 }198 199 BufferedImage tag = new BufferedImage(toWidth, toHeight, hasNotAlpha ? BufferedImage.TYPE_INT_RGB : BufferedImage.TYPE_INT_ARGB);200 201 // 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202 tag.getGraphics().drawImage(img.getScaledInstance(toWidth, toHeight, Image.SCALE_SMOOTH), 0, 0, null);203 ImageIO.write(tag, hasNotAlpha ? "jpg" : "png", output);204 } catch (Exception e) {205 e.printStackTrace();206 throw new Exception(e);207 } finally {208 IOUtils.closeQuietly(input);209 IOUtils.closeQuietly(output);210 }211 212}213 214/**215* 重调图片尺寸216* 217* @param srcFile218* 原图路径219* @param destFile220* 目标文件221* @param width222* 新的宽度，小于1则忽略，按原图比例缩放223* @param height224* 新的高度，小于1则忽略，按原图比例缩放225* @param maxWidth226* 最大宽度，限制目标图片宽度，小于1则忽略此设置227* @param maxHeight228* 最大高度，限制目标图片高度，小于1则忽略此设置229*/230public static void resize(String srcFile, String destFile, int width,231 int height, int maxWidth, int maxHeight) throws Exception {232 resize(new File(srcFile), new File(destFile), width, height, maxWidth, maxHeight);233}234 235/**236* 重调图片尺寸237* 238* @param srcFile239* 原图路径240* @param destFile241* 目标文件242* @param width243* 新的宽度，小于1则忽略，按原图比例缩放244* @param height245* 新的高度，小于1则忽略，按原图比例缩放246*/247public static void resize(File srcFile, File destFile, int width, int height) throws Exception {248 resize(srcFile, destFile, width, height, -1, -1);249}250 251/**252* 重调图片尺寸253* 254* @param srcFile255* 原图路径256* @param destFile257* 目标文件258* @param width259* 新的宽度，小于1则忽略，按原图比例缩放260* @param height261* 新的高度，小于1则忽略，按原图比例缩放262* @param maxWidth263* 最大宽度，限制目标图片宽度，小于1则忽略此设置264* @param maxHeight265* 最大高度，限制目标图片高度，小于1则忽略此设置266*/267public static void resize(File srcFile, File destFile, int width,268 int height, int maxWidth, int maxHeight) throws Exception {269 if (destFile.exists()) {270 destFile.delete();271 } else {272 FolderUtils.mkdirs(destFile.getParent());273 }274 InputStream input = null;275 OutputStream output = null;276 try {277 input = new BufferedInputStream(new FileInputStream(srcFile));278 output = new FileOutputStream(destFile);279 resize(input, output, width, height, maxWidth, maxHeight);280 } catch (FileNotFoundException e) {281 e.printStackTrace();282 throw new Exception(e);283 } finally {284 IOUtils.closeQuietly(input);285 IOUtils.closeQuietly(output);286 }287}288 289/**290* 裁剪图片291* 292* @param source293* a {@link java.lang.String} object.294* @param target295* a {@link java.lang.String} object.296* @param x297* a int.298* @param y299* a int.300* @param w301* a int.302* @param h303* a int.304*/305public static void crop(String source, String target, int x, int y, int w, int h) throws Exception {306 crop(new File(source), new File(target), x, y, w, h);307}308 309/**310* 裁剪图片311* 312* @param source313* a {@link java.io.File} object.314* @param target315* a {@link java.io.File} object.316* @param x317* a int.318* @param y319* a int.320* @param w321* a int.322* @param h323* a int.324*/325public static void crop(File source, File target, int x, int y, int w, int h) throws Exception {326 OutputStream output = null;327 InputStream input = null;328 String ext = FilenameUtils.getExtension(target.getName());329 try {330 input = new BufferedInputStream(new FileInputStream(source));331 if (target.exists()) {332 target.delete();333 } else {334 FolderUtils.mkdirs(target.getParent());335 }336 output = new BufferedOutputStream(new FileOutputStream(target));337 } catch (IOException e) {338 throw new Exception(e);339 }340 crop(input, output, x, y, w, h, StringUtils.equalsIgnoreCase("png", ext));341}342 343/**344* 裁剪图片345* 346* @param x347* a int.348* @param y349* a int.350* @param w351* a int.352* @param h353* a int.354* @param input355* a {@link java.io.InputStream} object.356* @param output357* a {@link java.io.OutputStream} object.358* @param isPNG359* a boolean.360*/361public static void crop(InputStream input, OutputStream output, int x,362 int y, int w, int h, boolean isPNG) throws Exception {363 try {364 BufferedImage srcImg = ImageIO.read(input);365 int tmpWidth = srcImg.getWidth();366 int tmpHeight = srcImg.getHeight();367 int xx = Math.min(tmpWidth - 1, x);368 int yy = Math.min(tmpHeight - 1, y);369 370 int ww = w;371 if (xx + w > tmpWidth) {372 ww = Math.max(1, tmpWidth - xx);373 }374 int hh = h;375 if (yy + h > tmpHeight) {376 hh = Math.max(1, tmpHeight - yy);377 }378 379 BufferedImage dest = srcImg.getSubimage(xx, yy, ww, hh);380 381 BufferedImage tag = new BufferedImage(w, h, isPNG ? BufferedImage.TYPE_INT_ARGB : BufferedImage.TYPE_INT_RGB);382 383 tag.getGraphics().drawImage(dest, 0, 0, null);384 ImageIO.write(tag, isPNG ? "png" : "jpg", output);385 } catch (Exception e) {386 e.printStackTrace();387 throw new Exception(e);388 } finally {389 IOUtils.closeQuietly(input);390 IOUtils.closeQuietly(output);391 }392}393 394/**395* 压缩图片,PNG图片按JPG处理396* 397* @param input398* a {@link java.io.InputStream} object.399* @param output400* a {@link java.io.OutputStream} object.401* @param quality402* 图片质量0-1之间403*/404public static final void optimize(InputStream input, OutputStream output, float quality) throws Exception {405 406 // create a BufferedImage as the result of decoding the supplied407 // InputStream408 BufferedImage image;409 ImageOutputStream ios = null;410 ImageWriter writer = null;411 try {412 image = ImageIO.read(input);413 414 // get all image writers for JPG format415 Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpeg");416 417 if (!writers.hasNext())418 throw new IllegalStateException("No writers found");419 420 writer = (ImageWriter) writers.next();421 ios = ImageIO.createImageOutputStream(output);422 423 writer.setOutput(ios);424 425 ImageWriteParam param = writer.getDefaultWriteParam();426 427 // optimize to a given quality428 param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);429 param.setCompressionQuality(quality);430 431 // appends a complete image stream containing a single image and432 // associated stream and image metadata and thumbnails to the output433 writer.write(null, new IIOImage(image, null, null), param);434 } catch (IOException e) {435 e.printStackTrace();436 throw new Exception(e);437 } finally {438 if (ios != null) {439 try {440 ios.close();441 } catch (IOException e) {442 e.printStackTrace();443 throw new Exception(e);444 }445 }446 writer.dispose();447 }448}449 450/**451* 压缩图片452* 453* @param source454* a {@link java.lang.String} object.455* @param target456* a {@link java.lang.String} object.457* @param quality458* a float.459*/460public static final void optimize(String source, String target, float quality) throws Exception {461 File fromFile = new File(source);462 File toFile = new File(target);463 optimize(fromFile, toFile, quality);464}465 466/**467* 压缩图片468* 469* @param source470* a {@link java.io.File} object.471* @param target472* a {@link java.io.File} object.473* @param quality474* 图片质量0-1之间475*/476public static final void optimize(File source, File target, float quality) throws Exception {477 if (target.exists()) {478 target.delete();479 } else {480 FolderUtils.mkdirs(target.getParent());481 }482 InputStream is = null;483 OutputStream os = null;484 try {485 is = new BufferedInputStream(new FileInputStream(source));486 os = new BufferedOutputStream(new FileOutputStream(target));487 optimize(is, os, quality);488 } catch (FileNotFoundException e) {489 throw new Exception(e);490 } finally {491 IOUtils.closeQuietly(is);492 IOUtils.closeQuietly(os);493 }494}495 496/**497* 制作圆角498* 499* @param srcFile500* 原文件501* @param destFile502* 目标文件503* @param cornerRadius504* 角度505*/506public static void makeRoundedCorner(File srcFile, File destFile, int cornerRadius) throws Exception {507 InputStream in = null;508 OutputStream out = null;509 510 try {511 in = new BufferedInputStream(new FileInputStream(srcFile));512 FolderUtils.mkdirs(destFile.getParentFile().getAbsolutePath());513 out = new BufferedOutputStream(new FileOutputStream(destFile));514 makeRoundedCorner(in, out, cornerRadius);515 } catch (IOException e) {516 e.printStackTrace();517 throw new Exception(e);518 } finally {519 IOUtils.closeQuietly(out);520 IOUtils.closeQuietly(in);521 }522 523}524 525/**526* 制作圆角527* 528* @param srcFile529* 原文件530* @param destFile531* 目标文件532* @param cornerRadius533* 角度534*/535public static void makeRoundedCorner(String srcFile, String destFile, int cornerRadius) throws Exception {536 makeRoundedCorner(new File(srcFile), new File(destFile), cornerRadius);537}538 539/**540* 制作圆角541* 542* @param inputStream543* 原图输入流544* @param outputStream545* 目标输出流546* @param radius547* 角度548*/549public static void makeRoundedCorner(final InputStream inputStream,550 final OutputStream outputStream, final int radius) throws Exception {551 BufferedImage sourceImage = null;552 BufferedImage targetImage = null;553 try {554 sourceImage = ImageIO.read(inputStream);555 int w = sourceImage.getWidth();556 int h = sourceImage.getHeight();557 System.out.println(w);558 559 int cornerRadius = radius < 1 ? w / 4 : radius;560 561 targetImage = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);562 563 Graphics2D g2 = targetImage.createGraphics();564 565 // This is what we want, but it only does hard-clipping, i.e.566 // aliasing567 // g2.setClip(new RoundRectangle2D ...)568 569 // so instead fake soft-clipping by first drawing the desired clip570 // shape571 // in fully opaque white with antialiasing enabled...572 g2.setComposite(AlphaComposite.Src);573 g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);574 g2.setColor(Color.WHITE);575 g2.fill(new RoundRectangle2D.Float(0, 0, w, h, cornerRadius, cornerRadius));576 577 // ... then compositing the image on top,578 // using the white shape from above as alpha source579 g2.setComposite(AlphaComposite.SrcAtop);580 g2.drawImage(sourceImage, 0, 0, null);581 g2.dispose();582 ImageIO.write(targetImage, "png", outputStream);583 } catch (IOException e) {584 e.printStackTrace();585 throw new Exception(e);586 }587}588 589 }
