java 拼接头像9宫格

java后台拼接9宫格头像和添加水印文字，效果：

     

参考：https://blog.csdn.net/shichen88/article/details/101293541

1、拼接工具类：

package com.bai.blog.utils.files;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * 拼接图片 参考：https://blog.csdn.net/shichen88/article/details/101293541
 * FileName: FileSplitUtil
 * Create by: 漠天
 * Date: 2019/12/23
 */
public class FileSplitUtil {

    /**
     * 合成图片
     *
     * @param imagePaths    List
     * @param message       String
     * @param outPutPath    String
     * @throws IOException
     * return String
     */
    public static String overlapImage(List imagePaths, String message, String outPutPath) throws IOException {

        int withAndHeight = 530;//背景图片的宽高

        int dividerWithAndHeight = 20;//divider分割空白宽高

        int sonImageWithAndHeight = 150;//画的子头像图片的宽高

        int sonImageRadius= 30;//画的子头像的圆角

        // 设置背景图片大小，自己添加替换图片逻辑
//        BufferedImage backgroundImage = resizeImage(566, 230, ImageIO.read(new File(backgroundPath)));

        //new一个白色背景板
        BufferedImage backgroundImage = new BufferedImage(withAndHeight,withAndHeight,BufferedImage.TYPE_INT_ARGB);
        backgroundImage.getGraphics().setColor(Color.white);
        backgroundImage.getGraphics().fillRect(0,0,withAndHeight,withAndHeight);
        backgroundImage.getGraphics().dispose();
        backgroundImage = setClip(backgroundImage,30);

        // 初始化有效的图片BufferedImage列表
        List bufferedImageList = new ArrayList<>();
        for(String imagePath:imagePaths){
            bufferedImageList.add(setClip(resizeImage(sonImageWithAndHeight, sonImageWithAndHeight, ImageIO.read(new File(imagePath))),sonImageRadius));
        }

        // 获取背景画布
        Graphics2D graphics = backgroundImage.createGraphics();
        // 在背景图片上添加文字
        graphics.setColor(Color.blue);
        graphics.setFont(new Font("宋体", Font.PLAIN, 20));
        graphics.drawString(message, sonImageWithAndHeight/3, sonImageWithAndHeight/3);

        // 画出旋转的文字，在指定位置
        Font font = new Font("宋体", Font.PLAIN, 80);
        AffineTransform affineTransform = new AffineTransform();
        affineTransform.rotate(-Math.toRadians(45), 50, 20);
        Font rotatedFont = font.deriveFont(affineTransform);
        graphics.setFont(rotatedFont);
        graphics.drawString(message, sonImageWithAndHeight, withAndHeight-sonImageWithAndHeight);

        // 在背景图片上添加子图片
        if(bufferedImageList.size()>0){

            if(bufferedImageList.size()<2){

                graphics.drawImage(bufferedImageList.get(0), dividerWithAndHeight, dividerWithAndHeight, withAndHeight-dividerWithAndHeight*2, withAndHeight-dividerWithAndHeight*2, null);

            }else if(bufferedImageList.size()<3){

                int newSonWidth =  withAndHeight/2-dividerWithAndHeight*2;
                int centerPlex =(withAndHeight-newSonWidth)/2;
                graphics.drawImage(bufferedImageList.get(0), dividerWithAndHeight+dividerWithAndHeight/2, centerPlex, newSonWidth, newSonWidth, null);
                graphics.drawImage(bufferedImageList.get(1), newSonWidth+dividerWithAndHeight*2+dividerWithAndHeight/2, centerPlex, newSonWidth, newSonWidth, null);

            }else if(bufferedImageList.size()<10){

                for(int i=0;i

2、调用：

        List formatFilePath = new ArrayList<>();
        formatFilePath.add("D:/JavaLibFiles/Files/1.png");
        formatFilePath.add("D:/JavaLibFiles/Files/2.png");
        formatFilePath.add("D:/JavaLibFiles/Files/3.png");
        formatFilePath.add("D:/JavaLibFiles/Files/4.png");
        formatFilePath.add("D:/JavaLibFiles/Files/5.png");
        formatFilePath.add("D:/JavaLibFiles/Files/6.png");
        formatFilePath.add("D:/JavaLibFiles/Files/7.png");

        String outPutPath = "D:/JavaLibFiles/Files/splitImage.png";

        String message = "测试拼接信息";
        
        String splitResultImagePath = FileSplitUtil.overlapImage(formatFilePath,message,outPutPath);
        // 结果地址：splitResultImagePath