java生成二维码

1，该文中的部分代码来自gitee上的开源项目，我只是整理了一下，使其更加规范且通用。

1.1首先引入对应的工具包。

 
   
   
     com.google.zxing 
    
   
     core 
    
   
     3.3.3 
    
   
   
   
     org.projectlombok 
    
   
     lombok 
    
   
     1.16.10 
    
   
     provided 
    
   
   
   
     com.google.zxing 
    
   
     javase 
    
   
     3.3.3 
    
   

1.2 基础的图片生成类，没有时间研究，就照抄了

package com.nchu.common.core.utils.qrcode; import com.google.zxing.LuminanceSource; import java.awt.*; import java.awt.geom.AffineTransform; import java.awt.image.BufferedImage; / * @Author LiuLaoLao * @Date 2021/12/3 15:34 * @Version 1.0 */ public class BufferedImageLuminanceSource extends LuminanceSource { private final BufferedImage image; private final int left; private final int top; public BufferedImageLuminanceSource(BufferedImage image) { this(image, 0, 0, image.getWidth(), image.getHeight()); } public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) { super(width, height); int sourceWidth = image.getWidth(); int sourceHeight = image.getHeight(); if (left + width > sourceWidth || top + height > sourceHeight) { throw new IllegalArgumentException("Crop rectangle does not fit within image data."); } for (int y = top; y < top + height; y++) { for (int x = left; x < left + width; x++) { if ((image.getRGB(x, y) & 0xFF000000) == 0) { image.setRGB(x, y, 0xFFFFFFFF); // = white } } } this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY); this.image.getGraphics().drawImage(image, 0, 0, null); this.left = left; this.top = top; } @Override public byte[] getRow(int y, byte[] row) { if (y < 0 || y >= getHeight()) { throw new IllegalArgumentException("Requested row is outside the image: " + y); } int width = getWidth(); if (row == null || row.length < width) { row = new byte[width]; } image.getRaster().getDataElements(left, top + y, width, 1, row); return row; } @Override public byte[] getMatrix() { int width = getWidth(); int height = getHeight(); int area = width * height; byte[] matrix = new byte[area]; image.getRaster().getDataElements(left, top, width, height, matrix); return matrix; } @Override public boolean isCropSupported() { return true; } @Override public LuminanceSource crop(int left, int top, int width, int height) { return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height); } @Override public boolean isRotateSupported() { return true; } @Override public LuminanceSource rotateCounterClockwise() { int sourceWidth = image.getWidth(); int sourceHeight = image.getHeight(); AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth); BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY); Graphics2D g = rotatedImage.createGraphics(); g.drawImage(image, transform, null); g.dispose(); int width = getWidth(); return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width); } } 

1.3 二维码生成的工具类

/ * @Author LiuLaoLao * @Date 2021/12/3 15:34 * @Version 1.0 */ @Slf4j public class QRCodeUtil { / * 创建二维码 * @param charSet 编码方式 * @param content 二维码内容 * @param qrWidth 二维码长度 * @param qrHeight 二维码高度 * @return */ public static BufferedImage createImage(String charSet,String content,int qrWidth,int qrHeight){ Hashtable hints = new Hashtable(); hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); hints.put(EncodeHintType.CHARACTER_SET, charSet); hints.put(EncodeHintType.MARGIN, 1); BitMatrix bitMatrix = null; try { bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE,qrWidth , qrHeight, // 修改二维码底部高度 hints); } catch (WriterException e) { e.printStackTrace(); } int width = bitMatrix.getWidth(); int height = bitMatrix.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, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF); } } return image; } / * 对已经生成好的二维码设置logo * @param source 二维码 * @param logo logo图片 * @param logoWidth logo宽度 * @param logoHeight logo高度 */ public static void insertLogoImage(BufferedImage source,Image logo,int logoWidth,int logoHeight){ Graphics2D graph = source.createGraphics(); int qrWidth = source.getWidth(); int qrHeight = source.getHeight(); int x = (qrWidth - logoWidth) / 2; int y = (qrHeight - logoHeight) / 2; graph.drawImage(logo, x, y, logoWidth, logoHeight, null); Shape shape = new RoundRectangle2D.Float(x, y, logoWidth, logoHeight, 6, 6); graph.setStroke(new BasicStroke(3f)); graph.draw(shape); graph.dispose(); } / * 缩小logo图片 * @param logoPath * @param logoWidth * @param logoHeight * @return */ public static Image compressLogo(String logoPath, int logoWidth, int logoHeight){ File file = new File(logoPath); if (!file.exists()) { System.err.println("" + logoPath + " 该文件不存在！"); return null; } Image original = null; try { original = ImageIO.read(new File(logoPath)); } catch (IOException e) { e.printStackTrace(); } int width = original.getWidth(null); int height = original.getHeight(null); if (width > logoWidth) { width = logoWidth; } if (height > logoHeight) { height = logoHeight; } Image image = original.getScaledInstance(width, height, Image.SCALE_SMOOTH); BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics g = tag.getGraphics(); g.drawImage(image, 0, 0, null); // 绘制缩小后的图 g.dispose(); return image; } / * 增加底部的说明文字 * @param source 二维码 * @param text 说明内容 * @param step */ public static BufferedImage addBottomFont(BufferedImage source, String text,int step) { int qrWidth = source.getWidth(); log.debug("二维码的宽度{}",qrWidth); int qrHeight = source.getHeight(); log.debug("二维码的高度{}",qrHeight); BufferedImage textImage = textToImage(text, qrWidth, 20,16); Graphics2D graph = source.createGraphics(); //开启文字抗锯齿 graph.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON); int width = textImage.getWidth(null); int height = textImage.getHeight(null); Image src = textImage; graph.drawImage(src, 0, qrHeight - (20 * step) - 10, width, height, null); graph.dispose(); return source; } / * 将文明说明增加到二维码上 * @param str * @param width * @param height * @param fontSize 字体大小 * @return */ public static BufferedImage textToImage(String str, int width, int height,int fontSize) { BufferedImage textImage = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB); Graphics2D g2 = (Graphics2D)textImage.getGraphics(); //开启文字抗锯齿 g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON); g2.setBackground(Color.WHITE); g2.clearRect(0, 0, width, height); g2.setPaint(Color.BLACK); FontRenderContext context = g2.getFontRenderContext(); Font font = new Font("微软雅黑", Font.BOLD, fontSize); g2.setFont(font); LineMetrics lineMetrics = font.getLineMetrics(str, context); FontMetrics fontMetrics = FontDesignMetrics.getMetrics(font); float offset = (width - fontMetrics.stringWidth(str)) / 2; float y = (height + lineMetrics.getAscent() - lineMetrics.getDescent() - lineMetrics.getLeading()) / 2; g2.drawString(str, (int)offset, (int)y); return textImage; } / * 顶部增加说明文字 * @param source * @param text * @param step */ public static void addUpFont(BufferedImage source, String text) { int qrWidth = source.getWidth(); int qrHeight = source.getHeight(); BufferedImage textImage = textToImage(text, qrWidth, 30,24); Graphics2D graph = source.createGraphics(); //开启文字抗锯齿 graph.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON); int width = textImage.getWidth(null); int height = textImage.getHeight(null); Image src = textImage; graph.drawImage(src, 0, 30, width, height, null); graph.dispose(); } / * 生成二维码图片 * @param charSet 二维码编码方式 * @param content 内容 * @param qrWidth 宽度 * @param qrHeight 长度 * @param formatName jpg等图片格式 * @param imgPath 二维码存放路径 */ public static void encode(String charSet,String content,int qrWidth,int qrHeight,String formatName,String imgPath){ BufferedImage image = QRCodeUtil.createImage(charSet,content,qrWidth,qrHeight); try { ImageIO.write(image, formatName, new File(imgPath)); } catch (IOException e) { e.printStackTrace(); } } / * 生成二维码图片流 * @param charSet 二维码编码方式 * @param content 内容 * @param qrWidth 宽度 * @param qrHeight 长度 * @return */ public static BufferedImage encode(String charSet,String content,int qrWidth,int qrHeight) { BufferedImage image = QRCodeUtil.createImage(charSet,content,qrWidth,qrHeight); return image; } public static void encode( BufferedImage image,String formatName,String imgPath){ try { ImageIO.write(image, formatName, new File(imgPath)); } catch (IOException e) { e.printStackTrace(); } } public static void mkdirs(String destPath) { File file = new File(destPath); // 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常) if (!file.exists() && !file.isDirectory()) { file.mkdirs(); } } /* * 解析二维码 */ public static String decode(File file,String cherSet) throws Exception { BufferedImage image; image = ImageIO.read(file); if (image == null) { return null; } BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image); BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source)); Result result; Hashtable hints = new Hashtable(); hints.put(DecodeHintType.CHARACTER_SET, cherSet); result = new MultiFormatReader().decode(bitmap, hints); String resultStr = result.getText(); return resultStr; } } 

说明应该足够的清晰了吧，这个的主要实现还是别人的功劳，我只是优化