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 java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;import javax.imageio.ImageIO;import org.apache.commons.lang3.StringUtils;/*** 该类是图片处理类* */
public final class ImageUtil {private ImageUtil() {}
/*** 生成组合头像* * [@param](https://my.oschina.net/u/2303379) paths*            用户图像* [@throws](https://my.oschina.net/throws) IOException*/public static File getCombinationOfhead(List<String> paths,String outPath)throws IOException {List<BufferedImage> bufferedImages = new ArrayList<BufferedImage>();int subHeight = 28;int subWidth = 28;if(paths.size() <= 0 || paths.size() > 9){return null;}if(paths.size() == 1){subHeight = 60;subWidth = 60;}else if(paths.size() == 2){subHeight = 40;subWidth = 40;}// 压缩图片所有的图片生成尺寸同意的 为 60x60for (int i = 0; i < paths.size(); i++) {if(StringUtils.isBlank(paths.get(i))){break;}bufferedImages.add(ImageUtil.resize2(paths.get(i), subHeight, subWidth, true));}int width = 100; // 这是画板的宽高int height = 100; // 这是画板的高度// BufferedImage.TYPE_INT_RGB可以自己定义可查看APIBufferedImage outImage = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);// 生成画布Graphics g = outImage.getGraphics();Graphics2D g2d = (Graphics2D) g;// 设置背景色g2d.setBackground(new Color(231,231,231));// 通过使用当前绘图表面的背景色进行填充来清除指定的矩形。g2d.clearRect(0, 0, width, height);// 开始拼凑 根据图片的数量判断该生成那种样式的组合头像目前为4中int j = 1;int k = 1;for (int i = 1; i <= bufferedImages.size(); i++) {if (bufferedImages.size() == 9) {if (i <= 3) {g2d.drawImage(bufferedImages.get(i - 1), subHeight*(i-1) + 4*i, 4, null);} else if(i > 3 && i<=6){g2d.drawImage(bufferedImages.get(i - 1), subHeight*(j-1) + 4*j, subWidth+4*2, null);j++;}else{g2d.drawImage(bufferedImages.get(i - 1), subHeight*(k-1) + 4*k, subWidth*2+16, null);k++;}}if (bufferedImages.size() == 8) {if (i <= 3) {g2d.drawImage(bufferedImages.get(i - 1), (subHeight) * (i-1) + 4*i, 4, null);} else if(i > 3 && i<=6){g2d.drawImage(bufferedImages.get(i - 1), (subHeight) * (j-1) + 4*j, 36, null);j++;}else{g2d.drawImage(bufferedImages.get(i - 1), (subHeight+4)*(k-1)+20, subWidth*2+ 4*3, null);k++;}}if (bufferedImages.size() == 7) {if (i <= 3) {g2d.drawImage(bufferedImages.get(i - 1), (subHeight) * (i-1) + 4*i, 4, null);} else if(i > 3 && i<=6){g2d.drawImage(bufferedImages.get(i - 1), (subHeight) * (j-1) + 4*j, 36, null);j++;}else{g2d.drawImage(bufferedImages.get(i - 1), subHeight+8, subWidth*2+ 4*3, null);k++;}}if (bufferedImages.size() == 6) {if (i <= 3) {g2d.drawImage(bufferedImages.get(i - 1), (subHeight) * (i-1) + 4*i, 20, null);} else {g2d.drawImage(bufferedImages.get(i - 1), (subHeight) * (j-1) + 4*j, 52, null);j++;}}else if (bufferedImages.size() == 5) {if (i <= 2) {g2d.drawImage(bufferedImages.get(i - 1), (subHeight+4) * (i-1) + 20, 20, null);} else {g2d.drawImage(bufferedImages.get(i - 1), (subHeight) * (j-1) + 4*j, 52, null);j++;}}else if (bufferedImages.size() == 4) {if (i <= 2) {g2d.drawImage(bufferedImages.get(i - 1), (subHeight+4) * (i-1) + 20, 20, null);} else {g2d.drawImage(bufferedImages.get(i - 1), (subHeight+4) * (j-1) + 20, 52, null);j++;}} else if (bufferedImages.size() == 3) {g2d.drawImage(bufferedImages.get(i - 1), subHeight * i + 4 * i- subHeight, 36, null);} else if (bufferedImages.size() == 2) {g2d.drawImage(bufferedImages.get(i - 1), subHeight * i + 4 +4 * i - subHeight,30, null);} else if (bufferedImages.size() == 1) {g2d.drawImage(bufferedImages.get(i - 1), 20, 20, null);}// 需要改变颜色的话在这里绘上颜色。可能会用到AlphaComposite类}String format = "JPG";File file = new File(outPath);ImageIO.write(outImage, format, file);return file;}/*** 图片缩放* * [@param](https://my.oschina.net/u/2303379) filePath*            图片路径* [@param](https://my.oschina.net/u/2303379) height*            高度* [@param](https://my.oschina.net/u/2303379) width*            宽度* @param bb*            比例不对时是否需要补白*/public static BufferedImage resize2(String filePath, int height, int width,boolean bb) {try {double ratio = 0; // 缩放比例//File f = new File(filePath);URL url = new URL(filePath);BufferedImage bi = ImageIO.read(url);Image itemp = bi.getScaledInstance(width, height,Image.SCALE_SMOOTH);// 计算比例if ((bi.getHeight() > height) || (bi.getWidth() > width)) {if (bi.getHeight() > bi.getWidth()) {ratio = (new Integer(height)).doubleValue()/ bi.getHeight();} else {ratio = (new Integer(width)).doubleValue() / bi.getWidth();}AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(ratio, ratio), null);itemp = op.filter(bi, null);}if (bb) {// copyimg(filePath, "D:\\img");BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);Graphics2D g = image.createGraphics();g.setColor(Color.white);g.fillRect(0, 0, width, height);if (width == itemp.getWidth(null))g.drawImage(itemp, 0, (height - itemp.getHeight(null)) / 2,itemp.getWidth(null), itemp.getHeight(null),Color.white, null);elseg.drawImage(itemp, (width - itemp.getWidth(null)) / 2, 0,itemp.getWidth(null), itemp.getHeight(null),Color.white, null);g.dispose();itemp = image;}return (BufferedImage) itemp;} catch (IOException e) {e.printStackTrace();}return null;}public static void main(String[] args) throws IOException{String outPath = "E:\\c.png";List<String> list = new ArrayList<String>();list.add("");
//        String format = "PNG";
//      ImageIO.write(resize2(filePath,200,200,false), format, new File(outPath));getCombinationOfhead(list,outPath);} }