原图（工程所在目录7098849.jpg）：

　　头像（工程所在目录20181023201750.jpg）：

　　开始合成（执行如下main方法）：

public static void main(String[] args) throws IOException    {        String rootPath = System.getProperty("user.dir");        String imageUrl = rootPath + File.separator + "7098849.jpg";        String headUrl = rootPath + File.separator + "20181023201750.jpg";        String newImageUrl = rootPath + File.separator + "20181023.jpg";        composePic(newImageUrl,imageUrl,headUrl);    }

/**     * 合成照片     *     * @author wulinfeng     * @param newImageUrl     * @param imageUrl     * @param headUrl     */    private static void composePic(String newImageUrl, String imageUrl, String headUrl)    {        String nickName = "不想下火车的人"; // 昵称        String color = "230,206,145"; // 昵称颜色        String font = "思源黑体 CN Normal,1,34"; // 昵称字体        String pos = "156,70"; // 昵称位置        String headimg_pos = "40,40"; // 头像位置        String headimg_size = "88,88"; // 头像大小                BufferedImage srcImg = null;        BufferedImage headImg = null;        try        {            srcImg = ImageIO.read(new File(imageUrl));            headImg = ImageIO.read(new File(headUrl));        }        catch (IOException e)        {            e.printStackTrace();        }                if (srcImg == null || headImg == null)        {            return;        }                Graphics2D g = srcImg.createGraphics();                String[] colorArray = color.split(",");        g.setColor(new Color(Integer.parseInt(colorArray[0]), Integer.parseInt(colorArray[1]),            Integer.parseInt(colorArray[2])));        String[] fontArray = font.split(",");        g.setFont(new Font(fontArray[0], Integer.parseInt(fontArray[1]), Integer.parseInt(fontArray[2])));        String[] posArray = pos.split(",");        g.drawString(nickName, Integer.parseInt(posArray[0]), Integer.parseInt(posArray[1]));                String[] headposArray = headimg_pos.split(",");        String[] headsizeArray = headimg_size.split(",");        g.drawImage(headImg,            Integer.parseInt(headposArray[0]),            Integer.parseInt(headposArray[1]),            Integer.parseInt(headsizeArray[0]),            Integer.parseInt(headsizeArray[1]),            null);        g.dispose();                try        {            FileOutputStream outImgStream = new FileOutputStream(newImageUrl);            ImageIO.write(srcImg, "jpg", outImgStream);            outImgStream.flush();            outImgStream.close();        }        catch (IOException e)        {            e.printStackTrace();        }            }

　　合成结果（工程所在目录20181023.jpg）：