随着微信在市场上的占有率不对升高,二维码开始逐渐进入人们的视野,扫码支付,扫码关注,扫码打开连接...
究竟二维码是个什么东西我就不在这里赘述了,关于这方面大家可以去上搜索引擎
我在这里就简单介绍一下一个Java的生成二维码工具,是Google提供的,zxing
源码:
package com.king.utils; import com.google.zxing.*; import com.google.zxing.client.j2se.BufferedImageLuminanceSource; import com.google.zxing.common.BitMatrix; import com.google.zxing.common.HybridBinarizer; import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; import org.apache.log4j.Logger; import javax.imageio.ImageIO; import javax.servlet.http.HttpServletResponse; import java.awt.*; import java.awt.geom.RoundRectangle2D; import java.awt.image.BufferedImage; import java.io.File; import java.io.FileOutputStream; import java.io.OutputStream; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Hashtable; import java.util.Random; /** * 创建二维码图片 * @Author:jsq * @Date: Created in 2018/6/7 10:34 * @Modified By **/ public class QrCodeUtil { private static Logger logger = Logger.getLogger(QrCodeUtil.class); private static final String CHARSET = "utf-8"; private static final String FORMAT_NAME = "JPG"; private static final int QRCODE_SIZE = 300; private static final int WIDTH = 60; private static final int HEIGHT = 60; public static void encoderJpgQrCoder(String content,String filePath) throws Exception{ File file = new File(filePath); if(file.exists()){ SimpleDateFormat sdf = new SimpleDateFormat("yyyMMddhhmmss"); String bakName = sdf.format(new Date()); file.renameTo(new File(filePath + "."+bakName+".bak")); } if(!file.exists()){ file.mkdir(); } FileOutputStream os = new FileOutputStream(file); encoderJpgQrCoder(content,os); } public static void encoderJpgQrCoder(String content, HttpServletResponse response) throws Exception{ encoderJpgQrCoder(content,response.getOutputStream()); } /** * 生成二维码 * @param content * @param os * @throws Exception */ public static void encoderJpgQrCoder(String content, OutputStream os) throws Exception{ try { String logoPath = getLogoPath(); boolean flag = false; if(logoPath != null && logoPath.length() > 0 ){ flag = true; } logger.info("QrContent="+content); BufferedImage bufferedImage = QrCodeUtil.createImage(content,logoPath,flag); ImageIO.write(bufferedImage,"jpg",os); }catch (Exception e){ e.printStackTrace(); throw e; } } public static BufferedImage createImage(String content,String imgPath,boolean needCompress) throws Exception{ Hashtable<EncodeHintType,Object> hints = new Hashtable<>(); hints.put(EncodeHintType.ERROR_CORRECTION,ErrorCorrectionLevel.H); hints.put(EncodeHintType.CHARACTER_SET,CHARSET); BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE,QRCODE_SIZE,QRCODE_SIZE,hints); 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); } } if(imgPath == null || "".equals(imgPath)){ return image; } insertImage(image,imgPath,needCompress); return image; } private static void insertImage(BufferedImage source,String imgPath,boolean needCompress) throws Exception{ File file = new File(imgPath); if(!file.exists()){ logger.info(" "+imgPath + " 该文件不存在!"); return ; } Image src = ImageIO.read(new File(imgPath)); int width = src.getWidth(null); int height = src.getHeight(null); if(needCompress){ if(width > WIDTH){ width = WIDTH; } if(height > HEIGHT){ height = HEIGHT; } Image image = src.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(); src = image; } Graphics2D graphics2D = source.createGraphics(); int x = (QRCODE_SIZE - width) /2 ; int y = (QRCODE_SIZE - height) /2; graphics2D.drawImage(src,x,y,width,height,null); Shape shape = new RoundRectangle2D.Float(x,y,width,height,6,6); graphics2D.setStroke(new BasicStroke(3f)); graphics2D.draw(shape); graphics2D.dispose(); } public static String encode(String content,String imgPath,String destPath,boolean needCompress) throws Exception{ BufferedImage image = createImage(content, imgPath, needCompress); mkdirs(destPath); String file = new Random().nextInt(99999999) + ".jpg"; ImageIO.write(image, FORMAT_NAME, new File(destPath + "/" + file)); return file; } /** * * @param content url内容 * @param logoImgPath 二维码logo图片地址 * @param destPath 生成的二维码位置 * @param fileName 二维码文件名 * @param needCompress 是否需要压缩 * @return * @throws Exception */ public static File encodeAndGetFile(String content, String logoImgPath, String destPath, String fileName, boolean needCompress) throws Exception { BufferedImage image = createImage(content, logoImgPath, needCompress); mkdirs(destPath); if (null == fileName || fileName.length() == 0) { fileName = new Random().nextInt(99999999) + ".jpg"; } File file = new File(destPath + "/" + fileName); ImageIO.write(image, FORMAT_NAME, file); return file; } /** * 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) * @param destPath 存放目录 */ 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(); } } /** * 生成二维码(内嵌LOGO) * @throws Exception */ public static void encode(String content, String imgPath, String destPath) throws Exception { encode(content, imgPath, destPath, false); } /** * 生成二维码 * @throws Exception */ public static void encode(String content, String destPath, boolean needCompress) throws Exception { encode(content, null, destPath, needCompress); } /** * 生成二维码 * @throws Exception */ public static void encode(String content, String destPath) throws Exception { encode(content, null, destPath, false); } /** * 生成二维码(内嵌LOGO) * @throws Exception */ public static void encode(String content, String imgPath, OutputStream output, boolean needCompress) throws Exception { BufferedImage image = createImage(content, imgPath, needCompress); ImageIO.write(image, FORMAT_NAME, output); } /** * 生成二维码 * @throws Exception */ public static void encode(String content, OutputStream output) throws Exception { encode(content, null, output, false); } /** * 解析二维码 * @throws Exception */ public static String decode(File file) 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<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>(); hints.put(DecodeHintType.CHARACTER_SET, CHARSET); result = new MultiFormatReader().decode(bitmap, hints); String resultStr = result.getText(); System.out.println(resultStr); return resultStr; } /** * 解析二维码 * @throws Exception */ public static String decode(String path) throws Exception { return decode(new File(path)); } /** * 获取验证码url * * @return */ public static String getLogoPath() { String codeUrl = ""; try { //codeUrl = PropertiesUtil.getContentByName("qrcode_logo_path");// 二维码logo地址 } catch (Exception e) { e.printStackTrace(); } return codeUrl; } public static void main(String[] args){ String url = "http://www.mobilesec110.com/"; try{ encodeAndGetFile(url,"E:\\tmp\\url.jpg","E:\\tmp","url.jpg",true); }catch (Exception e){ e.printStackTrace(); } } }
生层的二维码如下图所示: