java处理图片--图片的缩放，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);*/
}

}