java 对图片的添加文字描述，以及两张图片合成一张
最近公司一个需要，需要把商品的优惠卷分享链接，生成一个二维码然后和商品主图合成一张，并且在新合成的主图增加商品信息的描述，好了直接看合成后图片的样式
下面我就直接贴代码，首先是Contorller层
/** * 淘宝二维码，商品主图，合成一张图 * * @param pictUrl * @param request * @param response * @throws IOException */ @RequestMapping("/getTaoBaoqQRCode") public void getTaoBaoqQRCode(TaoBaoQRCode taoBaoQRCode, HttpServletRequest request, HttpServletResponse response) throws IOException { ServletOutputStream os = null; InputStream buffin = null; try { // 二维码 String couponUlr = "https:" + taoBaoQRCode.getCouponShareUrl();// 高额卷分享链接 byte[] imgByte = QrCodeUtil.createQrCode2Bytes(250, 250, couponUlr); buffin = new ByteArrayInputStream(imgByte); BufferedImage couponImage = ImageIO.read(buffin); // 商品主图 String imageUrl = "https:" + taoBaoQRCode.getPictUrl(); URL url = new URL(imageUrl); BufferedImage picImage = ImageIO.read(url); BufferedImage modifyImage = imageHandleUtil.mergeImage(picImage, couponImage, taoBaoQRCode.getTitle(), taoBaoQRCode.getReservePrice(), taoBaoQRCode.getZkFinalPrice()); response.setContentType("image/jpg"); os = response.getOutputStream(); ImageIO.write(modifyImage, "jpg", os); os.flush(); } catch (Exception e) { LOGGER.error("getTaoBaoqQRCode error"); e.printStackTrace(); } finally { buffin.close(); os.close(); } }
二维码QrCodeUtil 生成帮助类
public class QrCodeUtil { private static final int DAFAULT_WIDTH = 360; private static final int DAFAULT_HEIGHT = 360; private static final Logger LOGGER = LoggerFactory.getLogger(QrCodeUtil.class); public static String createQrCode(String text) { return createQrCode(DAFAULT_WIDTH, DAFAULT_HEIGHT, text); } public static String createQrCode(int widht, int height, String text) { HashMap<EncodeHintType, String> hints = new HashMap<EncodeHintType, String>(); hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); try { byte[] bytes = createQrCode2Bytes(widht, height, text); String fileName = UUID.randomUUID().toString().replaceAll("-", "") + ".png"; return UpYunClient.upload(fileName, bytes); } catch (Exception e) { LOGGER.error("create qrcode error", e); } return null; } public static byte[] createQrCode2Bytes(String text) { return createQrCode2Bytes(DAFAULT_WIDTH, DAFAULT_HEIGHT, text); } public static byte[] createQrCode2Bytes(int widht, int height, String text) { HashMap<EncodeHintType, String> hints = new HashMap<EncodeHintType, String>(); hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); try { BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, widht, height, hints); ByteArrayOutputStream out = new ByteArrayOutputStream(); BufferedImage image = MatrixToImageWriter.toBufferedImage(bitMatrix); ImageIO.write(image, "png", out); return out.toByteArray(); } catch (Exception e) { LOGGER.error("create qrcode error", e); } return null; } /** * 生成条形码并已字节码形式返回，生成的图片格式为png * * @param contents * @param width * @param height * @return */ public static byte[] createBarcode2Byte(String contents, int width, int height) { int codeWidth = 3 + // start guard (7 * 6) + // left bars 5 + // middle guard (7 * 6) + // right bars 3; // end guard codeWidth = Math.max(codeWidth, width); try { BitMatrix bitMatrix = new MultiFormatWriter().encode(contents, BarcodeFormat.CODE_128, codeWidth, height, null); BufferedImage image = MatrixToImageWriter.toBufferedImage(bitMatrix); ByteArrayOutputStream out = new ByteArrayOutputStream(); ImageIO.write(image, "png", out); return out.toByteArray(); } catch (Exception e) { e.printStackTrace(); } return null; } }
二维码生成我这里用的是谷歌的看下面maven pom.xml 文件
<!-- 条形码、二维码生成 -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>2.2</version>
</dependency>
合成图片方法如何
package com.qft.campuscircle.common.util; import java.awt.Color; import java.awt.Font; import java.awt.Graphics2D; import java.awt.RenderingHints; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.net.URL; import javax.imageio.ImageIO; import org.springframework.stereotype.Component; @Component public class ImageHandleUtil { private Font font = null; private Graphics2D g = null; /** * 导入本地图片到缓冲区 * * @param imgName * @return */ public BufferedImage loadImageLocal(String imgName) { try { return ImageIO.read(new File(imgName)); } catch (IOException e) { e.printStackTrace(); } return null; } /** * 导入网络图片到缓冲区 * * @param imgName * @return */ public BufferedImage loadImageUrl(String imgName) { try { URL url = new URL(imgName); return ImageIO.read(url); } catch (IOException e) { e.printStackTrace(); } return null; } /** * 生成新图片到本地 * * @param newImage * @param img */ public void writeImageLocal(String newImage, BufferedImage img) { if (newImage != null && img != null) { try { // 目录不存在则创建 String dirUrl = newImage.substring(0, newImage.lastIndexOf(File.separator)); File dir = new File(dirUrl); if (!dir.exists()) { dir.mkdirs(); } File outputfile = new File(newImage); ImageIO.write(img, "png", outputfile); } catch (IOException e) { e.printStackTrace(); } } } /** * 设定文字的字体等 * * @param fontStyle * @param fontSize */ public void setFont(String name, int style, int fontSize) { this.font = new Font(name, style, fontSize); } /** * 修改图片,返回修改后的图片缓冲区（只输出一行文本）,图片居中显示 * * @param img * @param content * @param y * @param color * @return */ public BufferedImage modifyImage(BufferedImage img, Object content, int y, Color color) { try { g = img.createGraphics(); g.setBackground(Color.WHITE); g.setColor(color);// 设置字体颜色 g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);// 抗锯齿 if (this.font != null) g.setFont(this.font); int width = img.getWidth();// 图片宽度 if (content != null) { String str = content.toString(); int strWidth = g.getFontMetrics().stringWidth(str);// 字体宽度 g.drawString(str, (width - strWidth) / 2, y); } g.dispose(); } catch (Exception e) { e.printStackTrace(); } return img; } public BufferedImage modifyImage(BufferedImage img, Object content, int x, int y, Color color) { try { g = img.createGraphics(); g.setBackground(Color.WHITE); g.setColor(color);// 设置字体颜色 g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);// 抗锯齿 if (this.font != null) g.setFont(this.font); if (content != null) { String str = content.toString(); g.drawString(str, x, y); } g.dispose(); } catch (Exception e) { e.printStackTrace(); } return img; } /** * 将一张图片画在另一张图片上 * * @param addImage 被添加的图片 * @param sourceImg 源图 * @param x * @param y * @param width * @param height * @return */ public BufferedImage modifyImagetogeter(BufferedImage addImage, BufferedImage sourceImg, int x, int y) { int width = addImage.getWidth(); int height = addImage.getHeight(); try { g = sourceImg.createGraphics(); g.drawImage(addImage, x, y, width, height, null); g.dispose(); } catch (Exception e) { e.printStackTrace(); } return sourceImg; } /** * * @param img1 * @param img2 * @param title 标题 * @param reservePrice 现价 * @param zkFinalPrice 折扣价 * @return BufferedImage * @throws IOException */ public BufferedImage mergeImage(BufferedImage img1, BufferedImage img2,String title,String reservePrice,String zkFinalPrice) throws IOException { Font font = new Font("微软雅黑", Font.BOLD, 20); int w1 = img1.getWidth(); int h1 = img1.getHeight(); int w2 = img2.getWidth(); int h2 = img2.getHeight(); BufferedImage newImage = new BufferedImage(w1, h2 + h1 + h2/2, BufferedImage.TYPE_INT_RGB);// 新的图 Graphics2D graphics = (Graphics2D) newImage.getGraphics(); graphics.setBackground(Color.WHITE); graphics.fillRect(0, 0, newImage.getWidth(), newImage.getHeight()); graphics.drawImage(img1, 0, 0, null); graphics.drawImage(img2, (newImage.getWidth()) / 2 - (w2 / 2), newImage.getHeight() - h2, null); graphics.setFont(font); graphics.setColor(Color.BLACK); int width = graphics.getFontMetrics(font).stringWidth(title); int startY = h1 + 30; if (width > newImage.getWidth()) { char[] array = title.toCharArray(); StringBuilder sb = new StringBuilder(array[0]); for (char c : array) { sb.append(c); int newWidth = graphics.getFontMetrics(font).stringWidth(sb.toString()); if ((newWidth + 19) >= newImage.getWidth()) {// 准备换行 graphics.drawString(sb.toString(), 0, startY); startY += 30; sb.delete(0, sb.length()); } } graphics.drawString(sb.toString(), 0, startY); } else { graphics.drawString(title, 0, startY); } graphics.drawString("现价￥"+reservePrice, 0, startY + 30); startY += 30; graphics.drawString("卷后价￥"+zkFinalPrice, 0, startY + 30); return newImage; } }
两个帮助类里面有很多方法没用到，大家只要看几个关键的方法就可以了，TaoBaoQRCode 对象里面的属性我就没列出来了，大家自己根据自己的需求而定
