这是我自己结合网上的一些资料封装的java图片处理类，支持图片的缩放，旋转，马赛克化。(转载请注明出处：) 不多说，上代码：
package deal;import java.awt.Color;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Image;import java.awt.geom.AffineTransform;import java.awt.image.AffineTransformOp;import java.awt.image.BufferedImage;import java.io.File;import javax.imageio.ImageIO;/** * 图像处理类. * * @author nagsh * */{String openUrl; // 原始图片打开路径String saveUrl; // 新图保存路径String saveName; // 新图名称String suffix; (String openUrl, String saveUrl, String saveName,String suffix) {this.openUrl = openUrl;this.saveName = saveName;this.saveUrl = saveUrl;this.suffix = suffix;}/*** 图片缩放.** @param width*需要的宽度* @param height*需要的高度* @throws Exception*/(int width, int height) throws Exception {double sx = 0.0;double sy = 0.0;File file = new File(openUrl);if (!file.isFile()) {throw new Exception(“ImageDeal>>>” + file + ” 不是一个图片文件!”);}BufferedImage bi = ImageIO.read(file); // 读取该图片// 计算x轴y轴缩放比例–如需等比例缩放，在调用之前确保参数width和height是等比例变化的sx = (double) width / bi.getWidth();sy = (double) height / bi.getHeight();AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(sx, sy), null);File sf = new File(saveUrl, saveName + “.” + suffix);Image zoomImage = op.filter(bi, null);try {ImageIO.write((BufferedImage) zoomImage, suffix, sf); // 保存图片} catch (Exception e) {e.printStackTrace();}}/*** 旋转** @param degree*旋转角度* @throws Exception*/(int degree) throws Exception {x; // 原点横坐标int y; // 原点纵坐标File file = new File(openUrl);if (!file.isFile()) {throw new Exception(“ImageDeal>>>” + file + ” 不是一个图片文件!”);}BufferedImage bi = ImageIO.read(file); // 读取该图片// 处理角度–确定旋转弧度degree = degree % 360;if (degree < 0)degree = (degree == 180 || degree == 0 || degree == 360) {swidth = bi.getWidth();sheight = bi.getHeight();} else if (degree == 90 || degree == 270) {sheight = bi.getWidth();swidth = bi.getHeight();} else {swidth = (int) (Math.sqrt(bi.getWidth() * bi.getWidth()+ bi.getHeight() * bi.getHeight()));sheight = (int) (Math.sqrt(bi.getWidth() * bi.getWidth()+ bi.getHeight() * bi.getHeight()));}x = (swidth / 2) – (bi.getWidth() / 2);// 确定原点坐标y = (sheight / 2) – (bi.getHeight() / 2);BufferedImage spinImage = new BufferedImage(swidth, sheight,bi.getType());// 设置图片背景颜色Graphics2D gs = (Graphics2D) spinImage.getGraphics();gs.setColor(Color.white);gs.fillRect(0, 0, swidth, sheight);// 以给定颜色绘制旋转后图片的背景AffineTransform at = new AffineTransform();at.rotate(theta, swidth / 2, sheight / 2);// 旋转图象at.translate(x, y);AffineTransformOp op = new AffineTransformOp(at,AffineTransformOp.TYPE_BICUBIC);spinImage = op.filter(bi, spinImage);File sf = new File(saveUrl, saveName + “.” + suffix);ImageIO.write(spinImage, suffix, sf); // 保存图片}/*** 马赛克化.* @param size 马赛克尺寸，即每个矩形的长宽* @return* @throws Exception*/(int size) throws Exception {File file = new File(openUrl);if (!file.isFile()) {throw new Exception(“ImageDeal>>>” + file + ” 不是一个图片文件!”);}BufferedImage bi = ImageIO.read(file); // 读取该图片BufferedImage spinImage = new BufferedImage(bi.getWidth(),bi.getHeight(), bi.TYPE_INT_RGB);;}(bi.getWidth() % size == 0) {xcount = bi.getWidth() / size;} else {xcount = bi.getWidth() / size + 1;}if (bi.getHeight() % size == 0) {ycount = bi.getHeight() / size;} else {ycount = bi.getHeight() / size + 1;}int x = 0; //坐标int y = 0;// 绘制马赛克(绘制矩形并填充颜色)Graphics gs = spinImage.getGraphics();for (int i = 0; i < xcount; i++) {for (int j = 0; j < ycount; j++) {//马赛克矩形格大小int mwidth = size;int mheight = size;if(i==xcount-1){ //横向最后一个比较特殊，可能不够一个sizemwidth = bi.getWidth()-x;}if(j == ycount-1){ //同理mheight =bi.getHeight()-y;}// 矩形颜色取中心像素点RGB值int centerX = x;int centerY = y;if (mwidth % 2 == 0) {centerX += mwidth / 2;} else {centerX += (mwidth – 1) / 2;}if (mheight % 2 == 0) {centerY += mheight / 2;} else {centerY += (mheight – 1) / 2;}Color color = new Color(bi.getRGB(centerX, centerY));gs.setColor(color);gs.fillRect(x, y, mwidth, mheight);y = y + size;// 计算下一个矩形的y坐标}y = 0;// 还原y坐标x = x + size;// 计算x坐标}gs.dispose();File sf = new File(saveUrl, saveName + “.” + suffix);ImageIO.write(spinImage, suffix, sf); ;}(String[] args) throws Exception {ImageDeal imageDeal = new ImageDeal(“e://1.jpg”, “e://”, “2”, “jpg”);}}
，不是每个人都一定快乐，不是每种痛都一定要述说。
