java处理图片--图片的缩放，旋转和马赛克化，java缩放,这是我自己结合网上的一些

java处理图片--图片的缩放，旋转和马赛克化，java缩放,这是我自己结合网上的一些

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：```javapackage 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,pngpublic 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);*/}

}```