java二维码生成

约定不等于承诺〃 2022-08-27 07:56 184阅读 0赞

/**
     * 
     */
    package com.spg.test;
    
    /**
     * 项目名称：weixinpay
     * 
     * @description:二维码生成<br>
     * 注意生成二维码和解析过程中的编码必须为GBK，否则解析过程会出错。
     * 
     * @author spg
     * 
     * @create_time：2014年5月20日 上午11:26:27
     * 
     * @version V1.0.0
     * 
     */
    import java.awt.Color;
    import java.awt.Graphics2D;
    import java.awt.Image;
    import java.awt.geom.AffineTransform;
    import java.awt.image.AffineTransformOp;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.util.HashMap;
    import java.util.Map;
    
    import javax.imageio.ImageIO;
    
    import com.google.zxing.BarcodeFormat;
    import com.google.zxing.BinaryBitmap;
    import com.google.zxing.DecodeHintType;
    import com.google.zxing.EncodeHintType;
    import com.google.zxing.LuminanceSource;
    import com.google.zxing.MultiFormatReader;
    import com.google.zxing.MultiFormatWriter;
    import com.google.zxing.Result;
    import com.google.zxing.WriterException;
    import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
    import com.google.zxing.client.j2se.MatrixToImageWriter;
    import com.google.zxing.common.BitMatrix;
    import com.google.zxing.common.HybridBinarizer;
    import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
    
    public class QRCodeUtil
    {
    
    	/**
    	 * 二维码宽高度默认200
    	 */
    	private static final int DEFAULT_IMAGE_WIDTH = 300;
    	private static final int DEFAULT_IMAGE_HEIGHT = 300;
    	
    	/**
    	 * 生成带图片二维码时内部图片大小
    	 */
    	private static final int INNER_IMAGE_WIDTH = 60;
    	private static final int INNER_IMAGE_HEIGHT = 60;
    	private static final int IMAGE_HALF_WIDTH = INNER_IMAGE_WIDTH / 2;
    	private static final int FRAME_WIDTH = 2;
    
    	/**
    	 * 生成普通二维码
    	 * 
    	 * @param contents 内容
    	 * @param width 二维码宽度，如果小于0，则按默认大小生成
    	 * @param height 二维码高度，如果小于0，则按默认大小生成
    	 * @param imgPath 生成后的文件完整存放路径，包含文件名。形如D:\aa.jpg
    	 */
    	public static void encodePR(String contents, int width, int height,
    			String imgPath)
    	{
    		Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
    		// 指定纠错等级
    		hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
    		// 指定编码格式
    		hints.put(EncodeHintType.CHARACTER_SET, "GBK");
    		if (width <= 0 || height <= 0)
    		{
    			width = DEFAULT_IMAGE_WIDTH;
    			height = DEFAULT_IMAGE_HEIGHT;
    		}
    		try
    		{
    			BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,
    					BarcodeFormat.QR_CODE, width, height, hints);
    			MatrixToImageWriter.writeToStream(bitMatrix, "jpg",
    					new FileOutputStream(imgPath));
    		} catch (Exception e)
    		{
    			e.printStackTrace();
    		}
    	}
    
    	/**
    	 * 生成带图片的二维码
    	 * 
    	 * @param content
    	 * @param width
    	 * @param height
    	 * @param srcImagePath
    	 * @param destImagePath
    	 */
    	public static void encodePR(String content, int width, int height,
    			String srcImagePath, String destImagePath)
    	{
    		try
    		{
    			ImageIO.write(genBarcode(content, width, height, srcImagePath),
    					"jpg", new File(destImagePath));
    		} catch (IOException e)
    		{
    			e.printStackTrace();
    		} catch (WriterException e)
    		{
    			e.printStackTrace();
    		}
    	}
    
    	/**
    	 * 针对二维码进行解析
    	 * 
    	 * @param imgPath 二维码文件路径
    	 * @return
    	 */
    	public static String decodePR(String imgPath)
    	{
    		BufferedImage image = null;
    		Result result = null;
    		try
    		{
    			image = ImageIO.read(new File(imgPath));
    			if (image == null)
    			{
    				throw new RuntimeException("the decode image may be not exists.");
    			}
    			LuminanceSource source = new BufferedImageLuminanceSource(image);
    			BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
    
    			Map<DecodeHintType, Object> hints = new HashMap<DecodeHintType, Object>();
    			hints.put(DecodeHintType.CHARACTER_SET, "GBK");
    
    			result = new MultiFormatReader().decode(bitmap, hints);
    			return result.getText();
    
    		} catch (Exception e)
    		{
    			e.printStackTrace();
    		}
    		return null;
    	}
    
    	/**
    	 * 创建条形码
    	 * 
    	 * @param contents
    	 * @param width
    	 * @param height
    	 * @param imgPath
    	 */
    	public static void encodeBar(String contents, int width, int height,
    			String imgPath)
    	{
    		// 条形码的最小宽度
    		int codeWidth = 98;
    		codeWidth = Math.max(codeWidth, width);
    		try
    		{
    			BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,
    					BarcodeFormat.EAN_13, codeWidth, height, null);
    
    			MatrixToImageWriter.writeToStream(bitMatrix, "png",
    					new FileOutputStream(imgPath));
    
    		} catch (Exception e)
    		{
    			e.printStackTrace();
    		}
    	}
    
    	/**
    	 * 针对条形码进行解析
    	 * 
    	 * @param imgPath
    	 * @return
    	 */
    	public static String decodeBar(String imgPath)
    	{
    		BufferedImage image = null;
    		Result result = null;
    		try
    		{
    			image = ImageIO.read(new File(imgPath));
    			if (image == null)
    			{
    				System.out.println("the decode image may be not exit.");
    			}
    			LuminanceSource source = new BufferedImageLuminanceSource(image);
    			BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
    
    			result = new MultiFormatReader().decode(bitmap, null);
    			return result.getText();
    		} catch (Exception e)
    		{
    			e.printStackTrace();
    		}
    		return null;
    	}
    
    	/**
    	 * 把传入的原始图像按高度和宽度进行缩放，生成符合要求的图标
    	 * 
    	 * @param srcImageFile
    	 *            源文件地址
    	 * @param height
    	 *            目标高度
    	 * @param width
    	 *            目标宽度
    	 * @param hasFiller
    	 *            比例不对时是否需要补白：true为补白; false为不补白;
    	 * @throws IOException
    	 */
    	private static BufferedImage scale(String srcImageFile, int height,
    			int width, boolean hasFiller) throws IOException
    	{
    		double ratio = 0.0; // 缩放比例
    		File file = new File(srcImageFile);
    		BufferedImage srcImage = ImageIO.read(file);
    		Image destImage = srcImage.getScaledInstance(width, height,
    				BufferedImage.SCALE_SMOOTH);
    		// 计算比例
    		if ((srcImage.getHeight() > height) || (srcImage.getWidth() > width))
    		{
    			if (srcImage.getHeight() > srcImage.getWidth())
    			{
    				ratio = (new Integer(height)).doubleValue()
    						/ srcImage.getHeight();
    			} else
    			{
    				ratio = (new Integer(width)).doubleValue()
    						/ srcImage.getWidth();
    			}
    			AffineTransformOp op = new AffineTransformOp(
    					AffineTransform.getScaleInstance(ratio, ratio), null);
    			destImage = op.filter(srcImage, null);
    		}
    		if (hasFiller)
    		{// 补白
    			BufferedImage image = new BufferedImage(width, height,
    					BufferedImage.TYPE_INT_RGB);
    			Graphics2D graphic = image.createGraphics();
    			graphic.setColor(Color.white);
    			graphic.fillRect(0, 0, width, height);
    			if (width == destImage.getWidth(null))
    				graphic.drawImage(destImage, 0,
    						(height - destImage.getHeight(null)) / 2,
    						destImage.getWidth(null), destImage.getHeight(null),
    						Color.white, null);
    			else
    				graphic.drawImage(destImage,
    						(width - destImage.getWidth(null)) / 2, 0,
    						destImage.getWidth(null), destImage.getHeight(null),
    						Color.white, null);
    			graphic.dispose();
    			destImage = image;
    		}
    		return (BufferedImage) destImage;
    	}
    
    	/**
    	 * 产生带有图片的二维码缓冲图像
    	 * 
    	 * @param content
    	 * @param width
    	 * @param height
    	 * @param srcImagePath
    	 * @return
    	 * @throws WriterException
    	 * @throws IOException
    	 */
    	private static BufferedImage genBarcode(String content, int width,
    			int height, String srcImagePath) throws WriterException,
    			IOException
    	{
    		// 读取源图像
    		BufferedImage scaleImage = scale(srcImagePath, INNER_IMAGE_WIDTH,
    				INNER_IMAGE_HEIGHT, true);
    		int[][] srcPixels = new int[INNER_IMAGE_WIDTH][INNER_IMAGE_HEIGHT];
    		for (int i = 0; i < scaleImage.getWidth(); i++)
    		{
    			for (int j = 0; j < scaleImage.getHeight(); j++)
    			{
    				srcPixels[i][j] = scaleImage.getRGB(i, j);
    			}
    		}
    
    		Map<EncodeHintType, Object> hint = new HashMap<EncodeHintType, Object>();
    		hint.put(EncodeHintType.CHARACTER_SET, "GBK");
    		hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
    		// 生成二维码
    		MultiFormatWriter mutiWriter = new MultiFormatWriter();
    		BitMatrix matrix = mutiWriter.encode(content, BarcodeFormat.QR_CODE,
    				width, height, hint);
    
    		// 二维矩阵转为一维像素数组
    		int halfW = matrix.getWidth() / 2;
    		int halfH = matrix.getHeight() / 2;
    		int[] pixels = new int[width * height];
    
    		for (int y = 0; y < matrix.getHeight(); y++)
    		{
    			for (int x = 0; x < matrix.getWidth(); x++)
    			{
    				// 读取图片
    				if (x > halfW - IMAGE_HALF_WIDTH
    						&& x < halfW + IMAGE_HALF_WIDTH
    						&& y > halfH - IMAGE_HALF_WIDTH
    						&& y < halfH + IMAGE_HALF_WIDTH)
    				{
    					pixels[y * width + x] = srcPixels[x - halfW
    							+ IMAGE_HALF_WIDTH][y - halfH + IMAGE_HALF_WIDTH];
    				}
    				// 在图片四周形成边框
    				else if ((x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
    						&& x < halfW - IMAGE_HALF_WIDTH + FRAME_WIDTH
    						&& y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
    						+ IMAGE_HALF_WIDTH + FRAME_WIDTH)
    						|| (x > halfW + IMAGE_HALF_WIDTH - FRAME_WIDTH
    								&& x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
    								&& y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
    								+ IMAGE_HALF_WIDTH + FRAME_WIDTH)
    						|| (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
    								&& x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
    								&& y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
    								- IMAGE_HALF_WIDTH + FRAME_WIDTH)
    						|| (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
    								&& x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
    								&& y > halfH + IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
    								+ IMAGE_HALF_WIDTH + FRAME_WIDTH))
    				{
    					pixels[y * width + x] = 0xfffffff;
    				} else
    				{
    					// 此处可以修改二维码的颜色，可以分别制定二维码和背景的颜色；
    					pixels[y * width + x] = matrix.get(x, y) ? 0xff000000
    							: 0xfffffff;
    				}
    			}
    		}
    
    		BufferedImage image = new BufferedImage(width, height,
    				BufferedImage.TYPE_INT_RGB);
    		image.getRaster().setDataElements(0, 0, width, height, pixels);
    
    		return image;
    	}
    
    	public static void main(String[] args)
    	{
    		String imgPath = "d:/pr1.jpg";
    		String contents = "你好,李四! welcome to zxing!"
    				+ "\n李四的博客[http://my.oschina.net/cloudcoder]"
    				+ "\nEmail[xxx@163.com]";
    		// 普通二维码的生成与解析
    		QRCodeUtil.encodePR(contents, 0, 10, imgPath);
    		System.out.println("生成二维码成功");
    		System.out.println(QRCodeUtil.decodePR(imgPath));
    
    		 // 带图片的二维的生成与解析
    		 imgPath = "d:/pr2.png";
    		 String srcPath = "d:/src.jpg";
    		 QRCodeUtil.encodePR(contents, 300, 300, srcPath, imgPath);
    		 System.out.println("生成带图片的二维码成功");
    		 System.out.println(QRCodeUtil.decodePR(imgPath));
    		
    		 // 条形码的生成与解析
    		 imgPath = "d:/bar.png";
    		 QRCodeUtil.encodeBar("6923450657713", 105, 50, imgPath);
    		 System.out.println("生成条形码成功");
    		 System.out.println(QRCodeUtil.decodeBar(imgPath));
    	}
    }

注意：如果使用JDK1.7版本，jar包的maven库为：

<dependency>
                <groupId>com.google.zxing</groupId>
                <artifactId>javase</artifactId>
                <version>3.0.1</version>
            </dependency>

但是如果使用JDK1.6一下版本编译，用以上jar包会报错，改用2.2版本jar包可解决。

zxing2.2.jar下载地址：http://download.csdn.net/detail/fengspg/7378425