java实现图片缩放、旋转和马赛克化

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);*/  }}