开发语言：这里使用的是java

具体思路：这个大家应该都知道，先把头像放到二维码上，生成带头像的二维码图片，然后再把带头像的二维码图片添加到海报图片上

具体代码实现如下：（效果如何需要自己亲自实践啦）

import javax.imageio.IIOImage;

import javax.imageio.ImageIO;

import javax.imageio.ImageWriteParam;

import javax.imageio.ImageWriter;

import javax.imageio.stream.ImageOutputStream;

import java.awt.*;

import java.awt.color.ColorSpace;

import java.awt.image.BufferedImage;

import java.awt.image.ColorConvertOp;

import java.io.*;

import java.net.URL;

public class AddPic {

public static void main(String[] args)throws IOException {

String userPath ="头像的url";

String qrcodeImg ="二维码的url";

String posterPath ="海报url";

BufferedImage qrcodeImage1 = ImageIO.read(new URL(qrcodeImg));

//获取海报图片

        BufferedImage posterImage = ImageIO.read(new URL(posterPath));

Graphics posterGrap = posterImage.getGraphics();

BufferedImage userImage = ImageIO.read(new URL(userPath));

System.out.println("Add icon to the qrcode!");

String headImgPath ="xxxxxxxxxxxxxxxxxxxxxxxxx";

        BufferedImage qrcodeImage =new ColorConvertOp(ColorSpace.getInstance(ColorSpace.CS_sRGB),null).filter(qrcodeImage1,null);

Graphics qrcodeGrap = qrcodeImage.getGraphics();

qrcodeGrap.drawImage(userImage, qrcodeImage.getWidth()/8*3, qrcodeImage.getHeight()/8*3, qrcodeImage.getWidth()/4, qrcodeImage.getHeight()/4,null);

File qrcodeFile =new File(headImgPath);

ImageIO.write(qrcodeImage,"PNG", qrcodeFile);

InputStream imagein =new FileInputStream(headImgPath);

BufferedImage headQrcodeImage = ImageIO.read(imagein);

posterGrap.drawImage(headQrcodeImage,0,0, Integer.parseInt("100"), Integer.parseInt("100"),null);

String finalPosterPath ="合成的图片";

File posterFile =new File(finalPosterPath);

OutputStream out =new FileOutputStream(posterFile);

ImageWriter writer =  ImageIO.getImageWritersByFormatName("jpg").next();

ImageOutputStream ios = ImageIO.createImageOutputStream(out);

writer.setOutput(ios);

ImageWriteParam param = writer.getDefaultWriteParam();

if (param.canWriteCompressed()){

param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);

param.setCompressionQuality(0.2f);

}

writer.write(null,new IIOImage(posterImage,null,null), param);

out.close();

ios.close();

writer.dispose();

}

}

需要注意的问题：

1、图片的色彩空间，例如微信生成的二维码默认的色彩空间是什么，因为我们希望生成头像二维码上是彩色的头像，对吧

2、生成的图片太大，不利于传输，那么就要考虑图片压缩

3、一张图片添加到另一张图片上时，位置的设置

4、图片合成的执行速度相对较慢，要用专门的线程处理