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(ListimagePaths, 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

ListbufferedImageList = 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：

ListformatFilePath = 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