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.youkuaiyun.com/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>