图片工具类,完成图片的截取和任意缩放:
package com.common.util; import java.awt.Graphics2D; import java.awt.Image; import java.awt.RenderingHints; import java.awt.geom.AffineTransform; import java.awt.image.BufferedImage; import java.awt.image.ColorModel; import java.awt.image.WritableRaster; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import javax.imageio.ImageIO; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.eclipse.swt.graphics.Rectangle; import com.gif4j.GifDecoder; import com.gif4j.GifEncoder; import com.gif4j.GifImage; import com.gif4j.GifTransformer; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGImageEncoder; /** 图片工具类,完成图片的截取 * * @author Beau Virgill */ public class IamgesResize { private static Log log = LogFactory.getLog(IamgesResize.class); BufferedImage bufImage; // 原始图片 int width; // 缩放的宽度 int height; // 缩放的高度 public IamgesResize() { // TODO Auto-generated constructor stub } public IamgesResize(String srcPath, int width, int height) { this.width = width; this.height = height; try { this.bufImage = ImageIO.read(new File(srcPath)); } catch (Exception e) { e.printStackTrace(); } } /** 实现图像的等比缩放和缩放后的截取,如果高度的值和宽度一样,则缩放按设置的值缩放 (只控制宽度的大小,高度的值设置不生效(只有高度的值和宽度的一样才生效), 高度自动按比例缩放;如果缩放的图片小于你设置的值则保存原图大小) * * @param inFilePath * 要缩放图片文件的路径 * @param outFilePath * 缩放后保存图片输出的路径 * @param width * 要截取宽度 * @param hight * 要截取的高度 * @throws Exception */ public static void zoomOutImage(String inFilePath, String outFilePath, int width, int hight, boolean smooth) throws Exception { int maxHight = 500; // 设置最大的图片高度; File file = new File(inFilePath); InputStream in = new FileInputStream(file); File saveFile = new File(outFilePath); BufferedImage srcImage = ImageIO.read(in); String gif = inFilePath.substring(inFilePath.lastIndexOf(".") + 1, inFilePath.length()); if ((gif.equals("gif") || gif.equals("GIF")) && smooth == true) // gif动态图片的处理 { IamgesResize.getGifImage(inFilePath, outFilePath, width, hight, true); } else { // 如果宽度和高度一样 或者图片的规格为 images_120 时不按等比缩放,如果需要等比缩放, 则将下面的 if 语句注释即可 if (width != hight && !outFilePath.contains("images_120")) { double sx = (double) width / srcImage.getWidth(); hight = (int) (srcImage.getHeight() * sx); } log.info("原理图片路径------>" + inFilePath); log.info("保存图片新路径------>" + saveFile); if (width > 0 || hight > 0) { // 原图的大小 int sw = srcImage.getWidth(); int sh = srcImage.getHeight(); log.info("原图宽=" + sw); log.info("原图高=" + sh); // 如果原图像的大小小于要缩放的图像大小,直接将要缩放的图像复制过去 if (sw > width && sh > hight) { srcImage = rize(srcImage, width, hight); } else { log.info("原图片的大小小于要缩放的大小,不需要缩小"); String fileName = saveFile.getName(); String formatName = fileName.substring(fileName.lastIndexOf('.') + 1); ImageIO.write(srcImage, formatName, saveFile); return; } } // 缩放后的图像的宽和高 int w = srcImage.getWidth(); int h = srcImage.getHeight(); log.info("缩小图片宽度= " + w); log.info("缩小图片高度= " + h); // 如果缩放后的图像和要求的图像宽度一样,就对缩放的图像的高度进行截取 if (w == width) { // 计算 X轴坐标 int x = 0; // 如果图片超过指定高度则截取一定的高度 if (h >= maxHight && width != 600) // 图片为600 的不需要截取高度 { int y = h / 2 - hight / 2; saveSubImage(srcImage, new Rectangle(x, y, width, maxHight), saveFile); } else { int y = h / 2 - hight / 2; saveSubImage(srcImage, new Rectangle(x, y, width, hight), saveFile); } } // 否则如果是缩放后的图像的高度和要求的图像高度一样,就对缩放后的图像的宽度进行截取 else if (h == hight) { // 计算X轴坐标 int x = w / 2 - width / 2; int y = 0; saveSubImage(srcImage, new Rectangle(x, y, width, hight), saveFile); } in.close(); } } /** @param srcPath * 图片的绝对路径 * @param width * 图片要缩放的宽度 * @param height * 图片要缩放的高度 * @param rizeType * 图片要缩放的类型(1:宽度固定,高度自动 2:按宽度和高度比例缩小) * @return */ public static BufferedImage rize(BufferedImage srcBufImage, int width, int height) { BufferedImage bufTarget = null; int type = srcBufImage.getType(); double sx = (double) width / srcBufImage.getWidth(); double sy = (double) height / srcBufImage.getHeight(); log.info("w=" + sx); log.info("h=" + sx); if (type == BufferedImage.TYPE_CUSTOM) { ColorModel cm = srcBufImage.getColorModel(); WritableRaster raster = cm.createCompatibleWritableRaster(width, height); boolean alphaPremultiplied = cm.isAlphaPremultiplied(); bufTarget = new BufferedImage(cm, raster, alphaPremultiplied, null); } else { bufTarget = new BufferedImage(width, height, type); } Graphics2D g = bufTarget.createGraphics(); g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY); g.drawRenderedImage(srcBufImage, AffineTransform.getScaleInstance(sx, sy)); g.dispose(); return bufTarget; } /** 实现缩放后的截图 * * @param image * 缩放后的图像 * @param subImageBounds * 要截取的子图的范围 * @param subImageFile * 要保存的文件 * @throws IOException */ private static void saveSubImage(BufferedImage image, Rectangle subImageBounds, File subImageFile) throws IOException { if (subImageBounds.x < 0 || subImageBounds.y < 0 || subImageBounds.width - subImageBounds.x > image.getWidth() || subImageBounds.height - subImageBounds.y > image.getHeight()) { log.info("Bad subimage bounds"); return; } BufferedImage subImage = image.getSubimage(subImageBounds.x, subImageBounds.y, subImageBounds.width, subImageBounds.height); String fileName = subImageFile.getName(); String formatName = fileName.substring(fileName.lastIndexOf('.') + 1); ImageIO.write(subImage, formatName, subImageFile); } /** 针对书签截屏的等比缩放(等比缩放,不失真) * * @param src * 源图片文件完整路径 * @param dist * 目标图片文件完整路径 * @param width * 缩放的宽度 * @param heightw * 缩放的高度 */ public static void createThumbnail(String src, String dist, float width, float height) { try { File srcfile = new File(src); if (!srcfile.exists()) { log.error("文件不存在"); return; } BufferedImage image = ImageIO.read(srcfile); // 获得缩放的比例 double ratio = 1.0; // 判断如果高、宽都不大于设定值,则不处理 if (image.getHeight() > height || image.getWidth() > width) { if (image.getHeight() > image.getWidth()) { ratio = height / image.getHeight(); } else { ratio = width / image.getWidth(); } } // 计算新的图面宽度和高度 int newWidth = (int) (image.getWidth() * ratio); int newHeight = (int) (image.getHeight() * ratio); BufferedImage bfImage = new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_INT_RGB); bfImage.getGraphics().drawImage(image.getScaledInstance(newWidth, newHeight, Image.SCALE_SMOOTH), 0, 0, null); FileOutputStream os = new FileOutputStream(dist); JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(os); encoder.encode(bfImage); os.close(); log.info("创建缩略图成功"); } catch (Exception e) { log.error("创建缩略图发生异常" + e.getMessage()); } } /** 实现图像的等比缩放和缩放后的截取,如果高度的值和宽度一样,则缩放按设置的值缩放 (只控制宽度的大小,高度的值设置不生效(只有高度的值和宽度的一样才生效), 高度自动按比例缩放;如果缩放的图片小于你设置的值则保存原图大小) * 如果要缩放的宽度和高度相等则不按比例缩放;直接缩小图片 * * @param filepath * 要缩放图片文件的路径 * @param saveFilePath * 缩放后保存图片输出的路径 * @param imgWidth * 要缩放的宽度 * @param imHeight * 要缩放的高度 * @return * @throws Exception */ public static boolean readPicfile(String filepath, String saveFilePath, int imgWidth, int imHeight) throws Exception { File file = new File(filepath); if (file.isDirectory()) { // 如果path表示的是否是文件夹,是返回true log.info("文件夹"); String[] filelist = file.list(); log.info("总图片个数=" + filelist.length); int count = 0; for (int i = 0; i < filelist.length; i++) { File readfile = new File(filepath + filelist[i]); if (!readfile.isDirectory()) { log.info("absolutepath=" + readfile.getAbsolutePath()); log.info("imgName=" + readfile.getName()); String imgfuffix = readfile.getName().substring(readfile.getName().lastIndexOf(".") + 1, readfile.getName().length()); // 获取文件的后缀 // 是图片类型的才执行缩放 if (isFromImgUrl(imgfuffix)) { count++; IamgesResize.zoomOutImage(filepath + readfile.getName(), saveFilePath + readfile.getName(), imgWidth, imHeight, true); IamgesResize.createThumbnail(filepath + readfile.getName(), saveFilePath + readfile.getName(), imgWidth, imHeight); } } } } return true; } /** gif图片缩放有动态效果 * * @param srcImg * 原始文件 * @param destImg * 要保存的文件 * @param width * 宽度 * @param height * 高度 * @param smooth * @throws Exception */ public static void getGifImage(String srcImg, String destImg, int width, int hight, boolean smooth) throws Exception { try { File file = new File(srcImg); File saveFile = new File(destImg); InputStream in = new FileInputStream(srcImg); BufferedImage srcImage = ImageIO.read(in); GifImage gifImage = GifDecoder.decode(file);// 创建一个GifImage对象. if (width > 0 || hight > 0) { // 原图的大小 int sw = srcImage.getWidth(); int sh = srcImage.getHeight(); if (width == hight) { } else if (sw > width) { double sx = (double) width / srcImage.getWidth(); hight = (int) (srcImage.getHeight() * sx); } else { width = sw; hight = sh; } } // 1.缩放重新更改大小. GifImage resizeIMG = GifTransformer.resize(gifImage, width, hight, true); // 2.剪切图片演示. // Rectangle rect = new Rectangle(0,0,200,200); // GifImage cropIMG = GifTransformer.crop(gifImage, rect); // 3.按比例缩放 // GifImage resizeIMG = GifTransformer.scale(gifImage, 1.0, 1.0,true);//参数需要double型 // 4.其他的方法.还有很多,比如水平翻转,垂直翻转 等等.都是GifTransformer类里面的. GifEncoder.encode(resizeIMG, saveFile); } catch (IOException e) { e.printStackTrace(); log.debug("保存失败(该图为修改过得gif图片),重新保存一次。"); IamgesResize.zoomOutImage(srcImg, destImg, width, hight, false); } } /** 判断网址是不是图片类型。 * * @param fromUrl * @return */ public static boolean isFromImgUrl(String imgfuffix) { boolean isImage = false; // 支持的图片后缀。 String[] imgSuffixs = { "jpg", "JPG", "jpeg", "JPEG", "gif", "GIF", "png", "PNG", "bmp", "BMP" }; for (int i = 0; i < imgSuffixs.length; i++) { if (imgfuffix.equals(imgSuffixs[i])) { isImage = true; break; } } return isImage; } }