JAVA后端生成类似于分享海报图片的功能的实现

首先确定一下我们需要实现的效果图

核心代码如下：

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.Toolkit;
import java.awt.geom.Ellipse2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.math.BigDecimal;
import java.net.URL;import javax.imageio.ImageIO;public void drawCouponPosterImage(String host, Long userId, GoodsInfoVO vo,String filePath)  {try {String pngString = vo.getPicUrl().substring(vo.getPicUrl().length() - 3);String savePath = ZshopConstants.UploadFilesConstants.STATICFILESTEMPPATH;String imageName = System.currentTimeMillis() + ".png";if (pngString.equals("png")) {URL url = new URL(vo.getPicUrl());InputStream is = url.openStream();byte[] buffer = new byte[1024];int len = 0;File imageFile = new File(savePath + File.separator + imageName);OutputStream os = new FileOutputStream(imageFile);if (!imageFile.exists()) {imageFile.mkdirs();}while ((len = is.read(buffer)) != -1) {os.write(buffer, 0, len);}os.close();is.close();System.out.println("保存图片");}JSONObject json = new JSONObject();json.put("userId", userId);json.put("goodsId", vo.getGoodsId());// 平台String platPath = host + "/resources/images/invite/taobao.png";if ("tmall".equals(vo.getFrom())) {platPath = host + "/resources/images/invite/tianmao.png";} else if ("jd".equals(vo.getFrom())) {platPath = host + "/resources/images/invite/jd.png";} else if ("pdd".equals(vo.getFrom())) {platPath = host + "/resources/images/invite/pdd.png";}BufferedImage platImage = ImageIO.read(new URL(platPath));// 透明底BufferedImage bg = new BufferedImage(750, 1250, BufferedImage.TYPE_INT_RGB);Graphics2D g = bg.createGraphics();g.setColor(Color.WHITE);g.fillRect(0, 0, 750, 1250);// 填充整个屏幕g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,         RenderingHints.VALUE_ANTIALIAS_ON);                        // 消除画图锯齿g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);  // 消除文字锯齿// 写入商品图Image src = Toolkit.getDefaultToolkit().getImage(new URL(vo.getPicUrl()));BufferedImage goodsImg = BufferedImageBuilder.toBufferedImage(src);if (pngString.equals("png")) {    // png单独处理String strImg = ZshopConstants.UploadFilesConstants.STATICFILESTEMPPATH + File.separator + imageName;goodsImg = ImageIO.read(new File(strImg));}int y = 10;Rectangle rectangle = new Rectangle(10, y, 730, 730);g.drawImage(goodsImg.getScaledInstance(rectangle.width, rectangle.height, Image.SCALE_SMOOTH), rectangle.x, rectangle.y, null);y+=735;// 优惠券背景String couponPath = host + "/resources/images/invite/goodsDetailCoupon.png";BufferedImage couponImg = ImageIO.read(new URL(couponPath));g.drawImage(couponImg.getScaledInstance(730, 158, Image.SCALE_SMOOTH), 10, y+10, 730, 158, null);y+=75;Double price = -1.0;Double rebatePrice = 0.0;try{rebatePrice =  (Double.valueOf(vo.getCommission()) * 0.33);price = Double.valueOf(vo.getPrice()) - rebatePrice;price = new BigDecimal(price).setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();     rebatePrice = new BigDecimal(rebatePrice).setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();}catch(Exception e){logger.error("计算到手价失败", e);}String couponPrice = vo.getCouponPrice() == null ? "0" : vo.getCouponPrice();String info =vo.getHasCoupon() ? "领" + couponPrice + "元券，下单返"+rebatePrice.toString() + "元" :  "下单返"+rebatePrice.toString() + "元";g.setFont(new Font("Microsoft YaHei", Font.BOLD, 30));g.setColor(new Color(255, 255, 255));g.drawString(info , vo.getHasCoupon() ? 40 : 110, y+15);g.setFont(new Font("Microsoft YaHei", Font.PLAIN, 28));g.setColor(new Color(255, 255, 255));g.drawString("超值好物，买就返现" , 90, y+65);String btnTitle ="长按获取";g.setColor(new Color(255, 255, 255));g.setFont(new Font("Microsoft YaHei", Font.PLAIN, 32));g.drawString(btnTitle, 530, y+25);y+=88;// 写入二维码String prefix = "jd".equals(vo.getFrom()) ? ZshopConstants.JD_PREFIX : "pdd".equals(vo.getFrom()) ? ZshopConstants.PDD_PREFIX : ZshopConstants.TAOBAO_PREFIX;BufferedImage qrcode = QrcodeGenerator.encode( ZshopConstants.MOBILE_HOST + "/#/detail/" + prefix + vo.getGoodsId(), 230, 230);g.drawImage(qrcode, 510, y+5, 230, 230, null);g.setFont(new Font("Microsoft YaHei", Font.PLAIN, 22));g.setColor(Color.gray);g.drawString("长按识别二维码" , 550, y+240);y+=25;// 写入平台图片g.drawImage(platImage.getScaledInstance(52, 28, Image.SCALE_SMOOTH), 15, y+7, 52, 28, null);y+=30;// 写入商品名g.setFont(new Font("Microsoft YaHei", Font.PLAIN, 32));g.setColor(Color.BLACK);String title = vo.getTitle();char[] sc = title.toCharArray();int titleOffsetY = 0;String titleSub = "";int row = 0;int j = 0;for (int i = 0; i < title.length(); i++) {titleSub = title.substring(j, i);int titleSubW = g.getFontMetrics().charsWidth(sc, j, i-j);int len = row >0 ?  450  : 400;if(titleSubW > len){j = i;int ox = row > 0 ? 15 : 75;row++;if( row == 3 && j < title.length()-1  ){titleSub = titleSub.substring(0, titleSub.length()-1)  + "...";}g.drawString(titleSub, ox, y + titleOffsetY );if(row  == 3){break;}else{titleOffsetY += 40;}}}if(row == 0){titleSub = title.substring(j,  title.length());g.drawString(titleSub, 75, y + titleOffsetY );}else if(row == 1 || row == 2){titleSub = title.substring(j,  title.length());g.drawString(titleSub, 10, y + titleOffsetY );}y =y + titleOffsetY + 40;g.setFont(new Font("Microsoft YaHei", Font.PLAIN, 25));g.setColor(Color.gray);g.drawString("商品价格以实际价格为准", 15, y);y+=30;// 到手价背景g.drawRect(15, y +10,90,40);g.setColor(new Color(255, 0, 61));g.fillRect(15, y +10,90,40);// 到手价g.setFont(new Font("Microsoft YaHei", Font.BOLD, 25));g.setColor(Color.white);g.drawString("到手价" , 23, y+38);// 到手价人民币图标g.setFont(new Font("Microsoft YaHei", Font.PLAIN, 36));g.setColor(Color.red);g.drawString("¥" , 125, y+45);// 到手价金额g.setFont(new Font("Microsoft YaHei", Font.BOLD, 60));g.setColor(Color.red);g.drawString(price <0?  vo.getPrice() : price.toString() , 145, y+45);// 原价g.setFont(new Font("Microsoft YaHei", Font.PLAIN, 30));g.setColor(new Color(89, 89, 89));g.drawString("原价: " , 350, y+45);// 原价金额g.setFont(new Font("Microsoft YaHei", Font.PLAIN, 30));g.setColor(new Color(89, 89, 89));g.drawString("¥" + vo.getOrgPrice() , 415, y+45);y+=110;g.setFont(new Font("Microsoft YaHei", Font.PLAIN, 36));g.setColor(Color.gray);g.drawString("花得值", 110, y);g.setFont(new Font("Microsoft YaHei", Font.PLAIN, 25));g.setColor(Color.gray);g.drawString("—— 淘宝、天猫、京东...优惠专享APP", 225, y-5);y+=10;g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);                       // 消除画图锯齿g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);  // 消除文字锯齿g.dispose();ImageIO.write(bg, "jpg", new File(filePath));} catch (IOException e) {logger.error("生成优惠券海报失败", e);}}

注：其中GoodsInfoVO 为商品对象，其中生成二维码的方法可参考另一篇博客，地址：https://blog.csdn.net/weixin_38340467/article/details/84784107

核心代码写完之后只要调用一下就好了

@Overridepublic String createCouponPoster(String host, Long userId, GoodsInfoVO vo) throws Exception{String fileUrl = (String)redisUtils.get("couponPoster:u"+userId+"_g"+vo.getGoodsId());if(StringUtil.isBlank(fileUrl)){//生成图片String imagePath = ZshopConstants.UploadFilesConstants.STATICFILESTEMPPATH + System.currentTimeMillis()+".jpg";File file = new File(imagePath);drawCouponPosterImage(host, userId, vo, imagePath);//上传至阿里云JSONObject res = ossService.sendFile(imagePath);if(res.getIntValue(SysCommand.CODE) == 1){fileUrl = res.getString("file")+"?x-oss-process=style/w750";redisUtils.set("couponPoster:u"+userId+"_g"+vo.getGoodsId(), fileUrl, 0);}//删除服务器端文件file.delete();}return fileUrl;}

ZshopContats类：

public class ZshopConstants {/*** 文件上传设置* @author CHARLEY**/public static class UploadFilesConstants{public final static String PDFURLHOST = PropertiesUtil.getProperty("elaon.pdf.win.host");/*** 上传host*/public final static String STATICFILESHOST = PropertiesUtil.getProperty("eloan.upload.host");/*** 静态图片文件资源目录*/public final static String STATICFILESTEMPPATH= PropertiesUtil.getProperty("eloan.upload.folder");/*** 静态pdf文件资源目录*/public final static String PDFFILEPATH = PropertiesUtil.getProperty("eloan.upload.folder-pdf") + DateUtil.dtSimpleYmFormat(new Date());public final static String TEMPLATEPATH = PropertiesUtil.getProperty("eloan.upload.folder");/*** 视频文件上传路径*/public final static String VIDEOFILEPATH= PropertiesUtil.getProperty("eloan.upload.folder") + "/video";}
}

BufferImageBuilder类：

package com.zxtg.zshop.util.image;import java.awt.Graphics;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
import java.awt.Image;
import java.awt.Transparency;
import java.awt.image.BufferedImage;import javax.swing.ImageIcon;public class BufferedImageBuilder {public static BufferedImage toBufferedImage(Image image) {if (image instanceof BufferedImage) {return (BufferedImage) image;}// This code ensures that all the pixels in the image are loadedimage = new ImageIcon(image).getImage();BufferedImage bimage = null;GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();try {int transparency = Transparency.OPAQUE;GraphicsDevice gs = ge.getDefaultScreenDevice();GraphicsConfiguration gc = gs.getDefaultConfiguration();bimage = gc.createCompatibleImage(image.getWidth(null),image.getHeight(null), transparency);} catch (HeadlessException e) {// The system does not have a screen}if (bimage == null) {// Create a buffered image using the default color modelint type = BufferedImage.TYPE_INT_RGB;bimage = new BufferedImage(image.getWidth(null),image.getHeight(null), type);}// Copy image to buffered imageGraphics g = bimage.createGraphics();// Paint the image onto the buffered imageg.drawImage(image, 0, 0, null);g.dispose();return bimage;}}

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