java生成帶logo的二維碼及前端顯示二維碼
阿新 • • 發佈:2019-02-05
package com.utils.generate_qrcode; import java.awt.AlphaComposite; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.io.UnsupportedEncodingException; import java.util.HashMap; import java.util.Map; import javax.imageio.ImageIO; import org.apache.commons.codec.binary.Base64; import org.apache.commons.codec.binary.Base64OutputStream; import com.google.zxing.BarcodeFormat; import com.google.zxing.EncodeHintType; import com.google.zxing.MultiFormatWriter; import com.google.zxing.NotFoundException; import com.google.zxing.WriterException; import com.google.zxing.common.BitMatrix; import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; public class QRCodeKit { public static final String QRCODE_DEFAULT_CHARSET = "UTF-8"; public static final int QRCODE_DEFAULT_HEIGHT = 150; public static final int QRCODE_DEFAULT_WIDTH = 150; private static final int BLACK = 0xFF000000; private static final int WHITE = 0xFFFFFFFF; public static void main(String[] args) throws IOException, NotFoundException{ String data = "http://www.baidu.com"; // logo圖片路徑(這是相對路徑) File logoFile = new File("img/logo/28.png"); BufferedImage image = QRCodeKit.createQRCodeWithLogo(data, logoFile); // 生成圖片 不需要的話註釋即可 //ImageIO.write(image, "png", new File("result7.png")); // 轉換成base64字串 ByteArrayOutputStream os=new ByteArrayOutputStream(); ImageIO.write(image, "png", os); Base64 base64 = new Base64(); String base64Img = new String(base64.encode(os.toByteArray())); System.err.println(base64Img); } /** * Create qrcode with default settings * * @author stefli * @param data * @return */ public static BufferedImage createQRCode(String data) { return createQRCode(data, QRCODE_DEFAULT_WIDTH, QRCODE_DEFAULT_HEIGHT); } /** * Create qrcode with default charset * * @author stefli * @param data * @param width * @param height * @return */ public static BufferedImage createQRCode(String data, int width, int height) { return createQRCode(data, QRCODE_DEFAULT_CHARSET, width, height); } /** * Create qrcode with specified charset * * @author stefli * @param data * @param charset * @param width * @param height * @return */ @SuppressWarnings({ "unchecked", "rawtypes" }) public static BufferedImage createQRCode(String data, String charset, int width, int height) { Map hint = new HashMap(); hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); hint.put(EncodeHintType.CHARACTER_SET, charset); return createQRCode(data, charset, hint, width, height); } /** * Create qrcode with specified hint * * @author stefli * @param data * @param charset * @param hint * @param width * @param height * @return */ public static BufferedImage createQRCode(String data, String charset, Map<EncodeHintType, ?> hint, int width, int height) { BitMatrix matrix; try { matrix = new MultiFormatWriter().encode(new String(data.getBytes(charset), charset), BarcodeFormat.QR_CODE, width, height, hint); return toBufferedImage(matrix); } catch (WriterException e) { throw new RuntimeException(e.getMessage(), e); } catch (Exception e) { throw new RuntimeException(e.getMessage(), e); } } public static BufferedImage toBufferedImage(BitMatrix matrix) { int width = matrix.getWidth(); int height = matrix.getHeight(); BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); for (int x = 0; x < width; x++) { for (int y = 0; y < height; y++) { image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE); } } return image; } /** * Create qrcode with default settings and logo * * @author stefli * @param data * @param logoFile * @return */ public static BufferedImage createQRCodeWithLogo(String data, File logoFile) { return createQRCodeWithLogo(data, QRCODE_DEFAULT_WIDTH, QRCODE_DEFAULT_HEIGHT, logoFile); } /** * Create qrcode with default charset and logo * * @author stefli * @param data * @param width * @param height * @param logoFile * @return */ public static BufferedImage createQRCodeWithLogo(String data, int width, int height, File logoFile) { return createQRCodeWithLogo(data, QRCODE_DEFAULT_CHARSET, width, height, logoFile); } /** * Create qrcode with specified charset and logo * * @author stefli * @param data * @param charset * @param width * @param height * @param logoFile * @return */ @SuppressWarnings({ "unchecked", "rawtypes" }) public static BufferedImage createQRCodeWithLogo(String data, String charset, int width, int height, File logoFile) { Map hint = new HashMap(); hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); hint.put(EncodeHintType.CHARACTER_SET, charset); return createQRCodeWithLogo(data, charset, hint, width, height, logoFile); } /** * Create qrcode with specified hint and logo * * @author stefli * @param data * @param charset * @param hint * @param width * @param height * @param logoFile * @return */ public static BufferedImage createQRCodeWithLogo(String data, String charset, Map<EncodeHintType, ?> hint, int width, int height, File logoFile) { try { BufferedImage qrcode = createQRCode(data, charset, hint, width, height); BufferedImage logo = ImageIO.read(logoFile); int deltaHeight = height - logo.getHeight(); int deltaWidth = width - logo.getWidth(); BufferedImage combined = new BufferedImage(height, width, BufferedImage.TYPE_INT_ARGB); Graphics2D g = (Graphics2D) combined.getGraphics(); g.drawImage(qrcode, 0, 0, null); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 1f)); g.drawImage(logo, (int) Math.round(deltaWidth / 2), (int) Math.round(deltaHeight / 2), null); return combined; } catch (IOException e) { throw new RuntimeException(e.getMessage(), e); } catch (Exception e) { throw new RuntimeException(e.getMessage(), e); } } /** * Return base64 for image * * @author stefli * @param image * @return */ public static String getImageBase64String(BufferedImage image) { String result = null; try { ByteArrayOutputStream os = new ByteArrayOutputStream(); OutputStream b64 = new Base64OutputStream(os); ImageIO.write(image, "png", b64); result = os.toString("UTF-8"); } catch (UnsupportedEncodingException e) { throw new RuntimeException(e.getMessage(), e); } catch (IOException e) { throw new RuntimeException(e.getMessage(), e); } return result; } /** * Decode the base64Image data to image * * @author stefli * @param base64ImageString * @param file */ public static void convertBase64StringToImage(String base64ImageString, File file) { FileOutputStream os; try { Base64 d = new Base64(); byte[] bs = d.decode(base64ImageString); os = new FileOutputStream(file.getAbsolutePath()); os.write(bs); os.close(); } catch (FileNotFoundException e) { throw new RuntimeException(e.getMessage(), e); } catch (IOException e) { throw new RuntimeException(e.getMessage(), e); } catch (Exception e) { throw new RuntimeException(e.getMessage(), e); } } }
maven座標:
<dependency> <groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>3.1.0</version> </dependency> <dependency> <groupId>commons-codec</groupId> <artifactId>commons-codec</artifactId> <version>1.8</version> </dependency>
前端顯示
<img src='data:img/jpg;base64,{生成的base64碼}'/>