图片处理工具类(图片压缩与图片裁剪)
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2022-06-07 11:32:21
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中作中由于需要对图片进行压缩和裁剪,因此参考网上的各种方法写了以下工具类
package com.qxgf.xyz0.utils; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Image; import java.awt.Toolkit; import java.awt.image.BufferedImage; import java.awt.image.ConvolveOp; import java.awt.image.CropImageFilter; import java.awt.image.FilteredImageSource; import java.awt.image.ImageFilter; import java.awt.image.Kernel; import java.io.File; import javax.imageio.ImageIO; /** * 图片处理工具类 * @author Administrator * */ public class ImgUtil { /** * 图片压缩 * @param srcImgFile 原始图片文件 * @param toImgFile 压缩后保存的目标图片文件 */ public static void compress(File srcImgFile, File toImgFile) { try { Image image = ImageIO.read(srcImgFile); int imageWidth = image.getWidth(null); int imageHeight = image.getHeight(null); float scale = 1.0f; if (imageWidth > 1280 || imageHeight > 1024) { //宽或高大于一定值,则进行尺寸上的压缩 scale = getRatio(imageWidth, imageHeight, 1280, 1024); } imageWidth = (int) (scale * imageWidth); imageHeight = (int) (scale * imageHeight); image = image.getScaledInstance(imageWidth, imageHeight,Image.SCALE_AREA_AVERAGING); BufferedImage bufferedImage = new BufferedImage(imageWidth,imageHeight, BufferedImage.TYPE_INT_RGB); Graphics2D g2 = bufferedImage.createGraphics(); g2.drawImage(image, 0, 0, imageWidth, imageHeight, Color.white,null); g2.dispose(); // 以下代码用于提高图片清晰度 float[] kernelData2 = { -0.125f, -0.125f, -0.125f, -0.125f, 2,-0.125f, -0.125f, -0.125f, -0.125f }; Kernel kernel = new Kernel(3, 3, kernelData2); ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null); bufferedImage = cOp.filter(bufferedImage, null); ImageIO.write(bufferedImage, "jpeg", toImgFile); } catch (Exception e) { e.printStackTrace(); throw new RuntimeException("图片压缩失败...."); } } /** * 获取压缩比率值 * @param currWidth * @param currHeight * @param afterWidth * @param afterHeight * @return */ private static float getRatio(int currWidth, int currHeight,int afterWidth, int afterHeight) { float ratio = 1.0f; float widthRatio = (float) afterWidth / currWidth; float heightRatio = (float) afterHeight / currHeight; if (widthRatio < 1.0 || heightRatio < 1.0) { ratio = widthRatio <= heightRatio ? widthRatio : heightRatio; } return ratio; } /** * 图片裁切 * @param srcImgFile 原始图片文件 * @param toImgFile 裁切后保存的目标文件 * @param imgCrop 裁剪参数对象实例 */ public static void crop(File srcImgFile, File toImgFile, ImgCrop imgCrop) { try { BufferedImage srcBufferedImg = ImageIO.read(srcImgFile); int srcWidth = srcBufferedImg.getWidth(); int srcHeight = srcBufferedImg.getHeight(); //由于比率精确度原因,允许20像素的误差 int cropImgTotalWidth = imgCrop.getX() + imgCrop.getWidth(); int cropImgTotalHeight = imgCrop.getY() + imgCrop.getHeight(); if (srcWidth >= cropImgTotalWidth-20 && srcHeight >= cropImgTotalHeight-20) { ImageFilter cropFilter = null; if(srcWidth < cropImgTotalWidth && srcHeight < cropImgTotalHeight) {//纠正X,Y误差 cropFilter = new CropImageFilter(imgCrop.getX(),imgCrop.getY(), srcWidth-imgCrop.getX(), srcHeight-imgCrop.getY()); }else if(srcWidth < cropImgTotalWidth) {//纠正X误差 cropFilter = new CropImageFilter(imgCrop.getX(),imgCrop.getY(), srcWidth-imgCrop.getX(), imgCrop.getHeight()); }else if(srcHeight < imgCrop.getHeight()) {//纠正Y误差 cropFilter = new CropImageFilter(imgCrop.getX(),imgCrop.getY(), imgCrop.getWidth(), srcHeight-imgCrop.getY()); }else { cropFilter = new CropImageFilter(imgCrop.getX(),imgCrop.getY(), imgCrop.getWidth(), imgCrop.getHeight()); } Image img = Toolkit.getDefaultToolkit().createImage(new FilteredImageSource(srcBufferedImg.getSource(),cropFilter)); BufferedImage toBufferedImg = new BufferedImage(imgCrop.getWidth(), imgCrop.getHeight(),BufferedImage.TYPE_INT_RGB); Graphics g = toBufferedImg.getGraphics(); g.drawImage(img, 0, 0, null); g.dispose(); ImageIO.write(toBufferedImg,FunctionUtil.getFileSuffix(toImgFile.getName()),toImgFile); } } catch (Exception e) { e.printStackTrace(); throw new RuntimeException("图片裁剪失败...."); } } /** * 图片裁剪信息包装类 * @author Administrator */ public static class ImgCrop { private Integer x; //起点X坐标 private Integer y; //起点Y坐标 private Integer width;//宽度 private Integer height;//高度 private Float ratio = 1.0f; //参数比率(因为图片的裁剪可能并不是在原图大小上进行的) public ImgCrop() {} public ImgCrop(Integer x, Integer y, Integer width, Integer height, Float ratio) { this.x = x; this.y = y; this.width = width; this.height = height; this.ratio = ratio == null ? this.ratio : ratio; } public Integer getX() { //取最小整数,不可用四舍五入法,否则可能导致裁剪值超出范围 return Math.round(ratio*x - 0.5f); } public void setX(Integer x) { this.x = x; } public Integer getY() { //取最小整数,不可用四舍五入法,否则可能导致裁剪值超出范围 return Math.round(ratio*y - 0.5f); } public void setY(Integer y) { this.y = y; } public Integer getWidth() { //取最小整数,不可用四舍五入法,否则可能导致裁剪值超出范围 return Math.round(ratio*width - 0.5f); } public void setWidth(Integer width) { this.width = width; } public Integer getHeight() { //取最小整数,不可用四舍五入法,否则可能导致裁剪值超出范围 return Math.round(ratio*height - 0.5f); } public void setHeight(Integer height) { this.height = height; } public Float getRatio() { return ratio; } public void setRatio(Float ratio) { this.ratio = ratio; } } }
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