java处理图片--图片的缩放，旋转和马赛克化

来源：互联网发布：高仿球鞋的淘宝店编辑：程序博客网时间：2024/05/02 01:42
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：
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);*/    }}
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