java处理图片--图片的缩放，旋转和马赛克化

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：http://blog.csdn.net/u012116457)
不多说，上代码：

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<code class="hljs java">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  *  */ public class ImageDeal {       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; // 新图类型 只支持gif,jpg,png       public ImageDeal(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      */     public void zoom(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      */     public void spin(int degree) throws Exception {         int swidth = 0; // 旋转后的宽度         int sheight = 0; // 旋转后的高度         int 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 = 360 + degree;// 将角度转换到0-360度之间         double theta = Math.toRadians(degree);// 将角度转为弧度           // 确定旋转后的宽和高         if (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      */     public boolean mosaic(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);         if (bi.getWidth() < size || bi.getHeight() < size || size <= 0) { // 马赛克格尺寸太大或太小             return false;         }           int xcount = 0; // 方向绘制个数         int ycount = 0; // y方向绘制个数         if (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size                      mwidth = 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); // 保存图片         return true;     }       public static void main(String[] args) throws Exception {         ImageDeal imageDeal = new ImageDeal("e://1.jpg", "e://", "2", "jpg");         // 测试缩放         /* imageDeal.zoom(200, 300); */         // 测试旋转         /* imageDeal.spin(90); */         //测试马赛克         /*imageDeal.mosaic(4);*/     }   } </code>