java实现仿微信群组合头像

package com.zovon.util;import java.awt.AlphaComposite;import java.awt.Color;import java.awt.Font;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.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.util.ArrayList;import java.util.List;import javax.imageio.ImageIO;/** * 该类是图片处理类 *  * @author 王永丰 * 出处:http://www.VEVb.com/zovon/p/4345501.html */public final class ImageUtil {    /** 图片格式：JPG */    PRivate static final String PICTRUE_FORMATE_JPG = "jpg";    private ImageUtil() {    }/**     * 生成组合头像     *      * @param paths     *            用户图像     * @throws IOException     */    public static void getCombinationOfhead(List<String> paths)            throws IOException {        List<BufferedImage> bufferedImages = new ArrayList<BufferedImage>();        // 压缩图片所有的图片生成尺寸同意的 为 50x50        for (int i = 0; i < paths.size(); i++) {            bufferedImages.add(ImageUtil.resize2(paths.get(i), 50, 50, true));        }        int width = 112; // 这是画板的宽高        int height = 112; // 这是画板的高度        // BufferedImage.TYPE_INT_RGB可以自己定义可查看API        BufferedImage 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;        for (int i = 1; i <= bufferedImages.size(); i++) {            if (bufferedImages.size() == 4) {                if (i <= 2) {                    g2d.drawImage(bufferedImages.get(i - 1), 50 * i + 4 * i                            - 50, 4, null);                } else {                    g2d.drawImage(bufferedImages.get(i - 1), 50 * j + 4 * j                            - 50, 58, null);                    j++;                }            } else if (bufferedImages.size() == 3) {                if (i <= 1) {                    g2d.drawImage(bufferedImages.get(i - 1), 31, 4, null);                } else {                    g2d.drawImage(bufferedImages.get(i - 1), 50 * j + 4 * j                            - 50, 58, null);                    j++;                }            } else if (bufferedImages.size() == 2) {                g2d.drawImage(bufferedImages.get(i - 1), 50 * i + 4 * i - 50,                        31, null);            } else if (bufferedImages.size() == 1) {                g2d.drawImage(bufferedImages.get(i - 1), 31, 31, null);            }            // 需要改变颜色的话在这里绘上颜色。可能会用到AlphaComposite类        }        String outPath = "E://b.jpg";        String format = "JPG";        ImageIO.write(outImage, format, new File(outPath));    }    /**     * 图片缩放     *      * @param filePath     *            图片路径     * @param height     *            高度     * @param 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);            BufferedImage bi = ImageIO.read(f);            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);                else                    g.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;    }}