java 实现图片合成，并添加文字

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

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