java模仿微信QQ群聊头像拼接，根据群聊内的用户头像拼接群聊头像，九宫格

朴灿烈づ我的快乐病毒、 2021-12-04 07:32 589阅读 0赞

java模仿微信QQ群聊头像拼接，根据群聊内的用户头像拼接群聊头像，九宫格  
效果图，这里只放了几张，1-9张图片都可以的，如果图片路径是从数据库查出来的相对路径，记得加上绝对路径否则会报找不到读取文件错误，把查出来的群成员头像路径加上绝对路径前缀，封装到list集合即可，然后在调用下面的工具类  
List paths = new ArrayList<>();  
String logoUrl = UUID.randomUUID() + “.png”;//防止覆盖  
UpdateGroupLogoUtil.generate(paths, BIDE.getFilePath() + logoUrl);  
BIDE.getFilePath() + logoUrl这个参数是拼接之后生成的图片地址和图片名  
如：F:\\zsl\\33 .jpg  
![在这里插入图片描述][20190718093930362.jpg]![在这里插入图片描述][20190718093946507.jpg]![在这里插入图片描述][20190718093914678.jpg]  
![在这里插入图片描述][20190718094019649.jpg]![在这里插入图片描述][20190718094002971.jpg]  
附带测试

package im.bide.utils;
    
    import javax.imageio.ImageIO;
    import java.awt.*;
    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.util.ArrayList;
    import java.util.List;
    
    public abstract class UpdateGroupLogoUtil {
        
        /**
         * 图片格式：JPG
         */
        private static final String PICTRUE_FORMATE = "jpg";
        
        /**
         * 生成组合头像
         * 画布宽度和高度为166，图片间距为2
         *
         * @param paths   用户头像路径列表
         * @param outPath 生成后的头像保存路径
         * @throws IOException
         */
        public static void generate(List<String> paths, String outPath) throws IOException {
            generate(paths, 166, 4, outPath);
        }
        
        /**
         * 生成组合头像
         *
         * @param paths    用户头像路径列表
         * @param length   画板的宽高和高度
         * @param interval 画板中的图片间距
         * @param outPath  生成后的头像保存路径
         * @throws IOException
         */
        public static void generate(List<String> paths, int length, int interval, String outPath) throws IOException {
            int wh = (length - interval * 4) / 3; // 每个图片的宽高和高度：图片数>4
            if (paths.size() == 1) {
                wh = length - interval * 2; // 每个图片的宽高和高度：图片数=1
            }
            if (paths.size() > 1 && paths.size() < 5) {
                wh = (length - interval * 3) / 2; // 每个图片的宽高和高度：图片数>0并且<5
            }
            List<BufferedImage> bufferedImages = new ArrayList<BufferedImage>();
            for (int i = 0; i < paths.size(); i++) {
                bufferedImages.add(UpdateGroupLogoUtil.resize(paths.get(i), wh, wh, false));
            }
            // BufferedImage.TYPE_INT_RGB可以自己定义可查看API
            BufferedImage outImage = new BufferedImage(length, length, 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(255, 255, 255));
            // 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, length, length);
            // 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
            for (int i = 1; i <= bufferedImages.size(); i++) {
                int j = i % 3 + 1;
                if (bufferedImages.size() < 5) {
                    j = i % 2 + 1;
                }
                int x = interval * j + wh * (j - 1);
                int split = (wh + interval) / 2;
                if (bufferedImages.size() == 9) {
                    if (i <= 3) {
                        g2d.drawImage(bufferedImages.get(i - 1), x, wh * 2 + interval * 3, null);
                    } else if (i <= 6) {
                        g2d.drawImage(bufferedImages.get(i - 1), x, wh + interval * 2, null);
                    } else {
                        g2d.drawImage(bufferedImages.get(i - 1), x, interval, null);
                    }
                } else if (bufferedImages.size() == 8) {
                    if (i <= 3) {
                        g2d.drawImage(bufferedImages.get(i - 1), x, wh * 2 + interval * 3, null);
                    } else if (i <= 6) {
                        g2d.drawImage(bufferedImages.get(i - 1), x, wh + interval * 2, null);
                    } else {
                        g2d.drawImage(bufferedImages.get(i - 1), x - split, interval, null);
                    }
                } else if (bufferedImages.size() == 7) {
                    if (i <= 3) {
                        g2d.drawImage(bufferedImages.get(i - 1), x, wh * 2 + interval * 3, null);
                    } else if (i <= 6) {
                        g2d.drawImage(bufferedImages.get(i - 1), x, wh + interval * 2, null);
                    } else {
                        g2d.drawImage(bufferedImages.get(i - 1), (length - wh) / 2, interval, null);
                    }
                } else if (bufferedImages.size() == 6) {
                    if (i <= 3) {
                        g2d.drawImage(bufferedImages.get(i - 1), x, wh * 2 + interval * 3 - split, null);
                    } else if (i <= 6) {
                        g2d.drawImage(bufferedImages.get(i - 1), x, wh + interval * 2 - split, null);
                    }
                } else if (bufferedImages.size() == 5) {
                    if (i <= 3) {
                        g2d.drawImage(bufferedImages.get(i - 1), x, wh * 2 + interval * 3 - split, null);
                    } else {
                        g2d.drawImage(bufferedImages.get(i - 1), x - split, wh + interval * 2 - split, null);
                    }
                } else if (bufferedImages.size() == 4) {
                    if (i <= 2) {
                        g2d.drawImage(bufferedImages.get(i - 1), x, wh + interval * 2, null);
                    } else {
                        g2d.drawImage(bufferedImages.get(i - 1), x, interval, null);
                    }
                } else if (bufferedImages.size() == 3) {
                    if (i <= 2) {
                        g2d.drawImage(bufferedImages.get(i - 1), x, wh + interval * 2, null);
                    } else {
                        g2d.drawImage(bufferedImages.get(i - 1), x - split, interval, null);
                    }
                } else if (bufferedImages.size() == 2) {
                    g2d.drawImage(bufferedImages.get(i - 1), x, wh + interval * 2 - split, null);
                } else if (bufferedImages.size() == 1) {
                    g2d.drawImage(bufferedImages.get(i - 1), interval, interval, null);
                }
                // 需要改变颜色的话在这里绘上颜色。可能会用到AlphaComposite类
            }
            ImageIO.write(outImage, PICTRUE_FORMATE, new File(outPath));
        }
        
        public static BufferedImage resize(String filePath, int width, int height) {
            try {
                BufferedImage bi = ImageIO.read(new File(filePath));
                bi.getSubimage(0, 0, width, height);
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }
        
        /**
         * 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 resize(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) {
                    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;
        }
        
        public static void main(String[] args) throws Exception {
            ArrayList<String> picUrls = new ArrayList<>();
            String pic = "F:\\zsl\\";
            picUrls.add(pic + "1.jpg");
            picUrls.add(pic + "2.jpg");
            picUrls.add(pic + "3.jpg");
    //        picUrls.add(pic + "4.jpg");
    //        picUrls.add(pic + "5.jpg");
    //        picUrls.add(pic + "6.jpg");
    //        picUrls.add(pic + "7.jpg");
    //        picUrls.add(pic + "8.jpg");
    //        picUrls.add(pic + "9.jpg");
            
            //2 调用工具类 生成九宫格 并保存在已有路径
            UpdateGroupLogoUtil.generate(picUrls, "F:\\zsl\\33 .jpg");
        }
        
    }

[20190718093930362.jpg]: https://img-blog.csdnimg.cn/20190718093930362.jpg
[20190718093946507.jpg]: https://img-blog.csdnimg.cn/20190718093946507.jpg
[20190718093914678.jpg]: /images/20211204/d4aca616ff09457d8151148c647b03ba.png
[20190718094019649.jpg]: https://img-blog.csdnimg.cn/20190718094019649.jpg
[20190718094002971.jpg]: /images/20211204/91ca840e453b4ddf9b924c14ee7020df.png