java 海报、图片合成

背景图、二维码都放在指定文件夹，三行文字可自定义，运行后海报直接写到指定文件夹poster.jpg。

package com.yipi.hzjy.controller.wx;import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.net.URL;public class ImageTool {public static void main(String[] args) throws Exception {// 2. 本地图片完整路径（可换成你自己的文件名）String bgPath  = "d://ls/share-bg.png";      // 背景图String qrPath  = "d://ls/code.png";  // 二维码create(bgPath, qrPath,"主标题文案","副标题文案，可以稍微长一点","长按识别小程序码了解更多");}public static void create(String bgPath,String qrPath,String title,String subTitle,String tips) throws Exception {// 1. 画布BufferedImage canvas = new BufferedImage(750, 1334, BufferedImage.TYPE_INT_RGB);Graphics2D g = canvas.createGraphics();g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_LCD_HRGB);// 2. 背景BufferedImage bg = ImageIO.read(new File(bgPath));g.drawImage(bg.getScaledInstance(750, 1334, Image.SCALE_SMOOTH), 0, 0, null);// 3. 二维码（居中，宽 300，底部留 200px）BufferedImage qr = ImageIO.read(new File(qrPath));int qrSize = 300;int qrX = (750 - qrSize) / 2;int qrY = 1334 - 200 - qrSize;g.drawImage(qr.getScaledInstance(qrSize, qrSize, Image.SCALE_SMOOTH), qrX, qrY, null);// 4. 标题g.setFont(new Font("微软雅黑", Font.BOLD, 44));g.setColor(Color.BLACK);drawCenterText(g, title, 200);// 5. 副标题g.setFont(new Font("微软雅黑", Font.PLAIN, 32));g.setColor(Color.DARK_GRAY);drawCenterText(g, subTitle, 260);// 6. 底部提示g.setFont(new Font("微软雅黑", Font.PLAIN, 26));g.setColor(Color.GRAY);drawCenterText(g, tips, 1334 - 160);g.dispose();// 7. 保存到桌面String outPath = "d://ls/poster.jpg";ImageIO.write(canvas, "jpg", new File(outPath));System.out.println("海报已生成：" + outPath);}// 水平居中写字private static void drawCenterText(Graphics2D g, String text, int y) {FontMetrics fm = g.getFontMetrics();int x = (750 - fm.stringWidth(text)) / 2;g.drawString(text, x, y);}
}