二維碼的生成及解析的低層實現並不簡單，咱們只須要知道怎麼使用就能夠了，參考博客：https://blog.csdn.net/jam_fanatic/article/details/82818857html
1.maven中jar包引用com.google.zxing；java
2.建立QRCodeUtil二維碼工具類，使用谷歌提供的幫助類BufferedImageLuminanceSource繪製二維碼。微信
生成二維碼：QRCodeUtil.encode(編碼到二維碼中的內容, 嵌入二維碼的圖片路徑, 生成的二維碼的存放路徑, 圖片是否進行壓縮);dom
解析二維碼：QRCodeUtil.decode(要解析的二維碼的存放路徑);maven
注意事項：若是你想讓別人掃描後跳轉一個頁面的話，直接在編碼的方法裏，將編碼內容改成一個地址就能夠了，這樣別人掃描二維碼後會自動跳轉。二維碼存的信息越多，二維碼圖片也就越複雜，容錯率也就越低，識別率也越低，而且二維碼能存的內容大小也是有限的（大概500個漢字左右）ide
1 package com.gsafety.consumer.util; 2 3 import java.awt.Graphics; 4 import java.awt.Graphics2D; 5 import java.awt.Image; 6 import java.awt.Shape; 7 import java.awt.geom.RoundRectangle2D; 8 import java.awt.image.BufferedImage; 9 import java.io.File; 10 import java.io.OutputStream; 11 import java.util.Hashtable; 12 13 import javax.imageio.ImageIO; 14 15 import com.google.zxing.BarcodeFormat; 16 import com.google.zxing.BinaryBitmap; 17 import com.google.zxing.DecodeHintType; 18 import com.google.zxing.EncodeHintType; 19 import com.google.zxing.MultiFormatReader; 20 import com.google.zxing.MultiFormatWriter; 21 import com.google.zxing.Result; 22 import com.google.zxing.client.j2se.BufferedImageLuminanceSource; 23 import com.google.zxing.common.BitMatrix; 24 import com.google.zxing.common.HybridBinarizer; 25 import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; 26 27 import lombok.extern.slf4j.Slf4j; 28 29 /** 30 * 二維碼工具類 31 */ 32 @Slf4j 33 public class QRCodeUtil { 34 35 36 37 private static final String CHARSET = "utf-8"; 38 private static final String FORMAT_NAME = "JPG"; 39 // 二維碼尺寸 40 private static final int QRCODE_SIZE = 250; 41 // LOGO寬度 42 private static final int WIDTH = 50; 43 // LOGO高度 44 private static final int HEIGHT = 50; 45 static SnowflakeIdWorker snowflakeIdWorker = new SnowflakeIdWorker(0,0); 46 private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception { 47 Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>(); 48 hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); 49 hints.put(EncodeHintType.CHARACTER_SET, CHARSET); 50 hints.put(EncodeHintType.MARGIN, 0); 51 BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, 52 hints); 53 int width = bitMatrix.getWidth(); 54 int height = bitMatrix.getHeight(); 55 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 56 for (int x = 0; x < width; x++) { 57 for (int y = 0; y < height; y++) { 58 image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF); 59 } 60 } 61 if (imgPath == null || "".equals(imgPath)) { 62 return image; 63 } 64 // 插入圖片 65 QRCodeUtil.insertImage(image, imgPath, needCompress); 66 return image; 67 } 68 /** 69 * 插入LOGO 70 * @param source 二維碼圖片 71 * @param imgPath LOGO圖片地址 72 * @param needCompress 是否壓縮 73 * @throws Exception 74 */ 75 private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception { 76 File file = new File(imgPath); 77 if (!file.exists()) { 78 log.info("{}該文件不存在！",imgPath); 79 return; 80 } 81 Image src = ImageIO.read(new File(imgPath)); 82 int width = src.getWidth(null); 83 int height = src.getHeight(null); 84 if (needCompress) { // 壓縮LOGO 85 if (width > WIDTH) { 86 width = WIDTH; 87 } 88 if (height > HEIGHT) { 89 height = HEIGHT; 90 } 91 Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH); 92 BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 93 Graphics g = tag.getGraphics(); 94 g.drawImage(image, 0, 0, null); // 繪製縮小後的圖 95 g.dispose(); 96 src = image; 97 } 98 // 插入LOGO 99 Graphics2D graph = source.createGraphics(); 100 int x = (QRCODE_SIZE - width) / 2; 101 int y = (QRCODE_SIZE - height) / 2; 102 // graph.setClip(new RoundRectangle2D.Double(0, 0, width, height, 90, 90)); 103 graph.drawImage(src, x, y, width, height, null); 104 Shape shape = new RoundRectangle2D.Float(x, y, width, width, 90,90); 105 // graph.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); 106 // graph.setStroke(new BasicStroke(-1f)); 107 graph.draw(shape); 108 graph.dispose(); 109 } 110 111 /** 112 * 113 * 生成二維碼(內嵌LOGO) 114 * @param content 內容 115 * @param imgPath LOGO地址 116 * @param destPath 存放目錄 117 * @param needCompress 是否壓縮LOGO 118 * @throws Exception 119 */ 120 121 public static String encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception { 122 BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress); 123 mkdirs(destPath); 124 String random = snowflakeIdWorker.nextId(); 125 String file = random + ".jpg"; 126 ImageIO.write(image, FORMAT_NAME, new File(destPath + "/" + file)); 127 return "/consumer_qrcode/"+file; 128 } 129 130 /** 131 * 當文件夾不存在時，mkdirs會自動建立多層目錄，區別於mkdir．(mkdir若是父目錄不存在則會拋出異常) 132 * @author 133 * @date 2013-12-11 上午10:16:36 134 * @param destPath 存放目錄 135 */ 136 public static void mkdirs(String destPath) { 137 File file = new File(destPath); 138 // 當文件夾不存在時，mkdirs會自動建立多層目錄，區別於mkdir．(mkdir若是父目錄不存在則會拋出異常) 139 if (!file.exists() && !file.isDirectory()) { 140 file.mkdirs(); 141 } 142 } 143 144 /** 145 * 146 * 生成二維碼(內嵌LOGO) 147 * @param content 內容 148 * @param imgPath LOGO地址 149 * @param destPath 存儲地址 150 * @throws Exception 151 */ 152 public static void encode(String content, String imgPath, String destPath) throws Exception { 153 QRCodeUtil.encode(content, imgPath, destPath, false); 154 } 155 156 /** 157 * 158 * 生成二維碼 159 * @param content 內容 160 * @param destPath 存儲地址 161 * @param needCompress 是否壓縮LOGO 162 * @throws Exception 163 */ 164 public static void encode(String content, String destPath, boolean needCompress) throws Exception { 165 QRCodeUtil.encode(content, null, destPath, needCompress); 166 } 167 168 /** 169 * 170 * 生成二維碼 171 * @param content 內容 172 * @param destPath 存儲地址 173 * @throws Exception 174 */ 175 public static void encode(String content, String destPath) throws Exception { 176 QRCodeUtil.encode(content, null, destPath, false); 177 } 178 179 /** 180 * 181 * 生成二維碼(內嵌LOGO) 182 * @param content 內容 183 * @param imgPath LOGO地址 184 * @param output 輸出流 185 * @param needCompress 是否壓縮LOGO 186 * @throws Exception 187 */ 188 public static void encode(String content, String imgPath, OutputStream output, boolean needCompress) 189 throws Exception { 190 BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress); 191 ImageIO.write(image, FORMAT_NAME, output); 192 } 193 194 /** 195 * 196 * 生成二維碼 197 * @param content 內容 198 * @param output 輸出流 199 * @throws Exception 200 */ 201 public static void encode(String content, OutputStream output) throws Exception { 202 QRCodeUtil.encode(content, null, output, false); 203 } 204 205 /** 206 * 207 * 解析二維碼 208 * @param file 二維碼圖片 209 * @return 210 * @throws 211 * Exception 212 */ 213 public static String decode(File file) throws Exception { 214 BufferedImage image; 215 image = ImageIO.read(file); 216 if (image == null) { 217 return null; 218 } 219 BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image); 220 BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source)); 221 Result result; 222 Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>(); 223 // 解碼設置編碼方式爲：utf-8， 224 hints.put(DecodeHintType.CHARACTER_SET, CHARSET); 225 //優化精度 226 hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE); 227 //複雜模式，開啓PURE_BARCODE模式 228 hints.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE); 229 result = new MultiFormatReader().decode(bitmap, hints); 230 231 String resultStr = result.getText(); 232 return resultStr; 233 } 234 235 /** 236 * 237 * 238 * 解析二維碼 239 * @param path 二維碼圖片地址 240 * @return 241 * @throws Exception 242 */ 243 public static String decode(String path) throws Exception { 244 return QRCodeUtil.decode(new File(path)); 245 } 246 247 public static void main(String[] args) throws Exception { 248 String text = "愛你一萬年"; // 二維碼內容 249 String logoPath = "D:\\work\\二維碼.png"; //嵌入二維碼的圖片路徑 250 String destPath = "D:\\work";//生成二維碼的地址 251 QRCodeUtil.encode(text, logoPath, destPath, false);//生成二維碼 252 // String decode = QRCodeUtil.decode("D:\\work/659518998202810368.jpg");//解析二維碼 253 // System.out.println(decode);//答應解析二維碼的內容 254 } 255 }
待補充。。。工具
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