使用google|使用google zxing生成二维码图片使用googlezxing生成二维码图片

生成二维码工具类：

1 import java.awt.geom.AffineTransform; 2 import java.awt.image.AffineTransformOp; 3 import java.awt.image.BufferedImage; 4 import java.io.ByteArrayOutputStream; 5 import java.io.IOException; 6 import java.util.Hashtable; 7 8 import javax.imageio.ImageIO; 9 10 import org.apache.commons.codec.binary.Base64; 11 12 import com.google.zxing.BarcodeFormat; 13 import com.google.zxing.EncodeHintType; 14 import com.google.zxing.common.BitMatrix; 15 import com.google.zxing.qrcode.QRCodeWriter; 16 import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; 17 18 public class QRCodeUtil 19 { 20 21private static final int BLACK = 0xFF000000; 22 23private static final int WHITE = 0xFFFFFFFF; 24 25/** 26* 生成二维码图片 27* @param content 28* @param width 29* @param height 30* @param hints 31* @return 32* @throws Exception 33*/ 34 35private static BufferedImage getQrCodeImage(String content, int width, int height, Hashtable hints) throws Exception 36{ 37// 使用zxing生成二维码图片数据类BitMatrix 38QRCodeWriter writer = new QRCodeWriter(); 39 40if (hints == null) 41{ 42hints = new Hashtable(); 43hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); 44} 45//编码信息，生成二维码 46BitMatrix matrix = writer.encode(content, BarcodeFormat.QR_CODE, width, height, hints); 47 48// 修改默认生成的二维码白边 49BitMatrix newMatrix = updateFrameWidth(matrix, 0); 50 51// 缩放图片（因为裁剪了空白的边框） 52BufferedImage bi = toBufferedImage(newMatrix); 53 54// 计算x轴y轴缩放比例 55double sx = (double)width / bi.getWidth(); 56double sy = (double)height / bi.getHeight(); 57 58BufferedImage zoomImage = zoomInImage(bi, sx, sy); 59 60return zoomImage; 61} 62 63/** 64* 将google zxing生成的二维码数据结构BitMatrix的内容写入图片缓冲区BufferedImage 65* @param matrix 66* @return 67*/ 68 69public static BufferedImage toBufferedImage(BitMatrix matrix) 70{ 71 72int width = matrix.getWidth(); 73int height = matrix.getHeight(); 74 75BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 76 77for (int x = 0; x < width; x++) 78{ 79for (int y = 0; y < height; y++) 80{ 81image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE); 82} 83} 84 85return image; 86} 87 88/** 89* 90* 获取二维码字节流 91* @param content 92* @param width 93* @param height 94* @return 95* @throws Exception 96*/ 97 98public static byte[] getQrCodeImageBytes(String content, int width, int height, Hashtable hints) throws Exception 99{ 100 101// 二维码输出质量，0:L(低), 1:M(中等), 2:Q, 3:H(高) 102int level = 3; 103 104hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.forBits(3)); 105hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); 106 107// 生成二维码图片 108BufferedImage zoomImage = getQrCodeImage(content, width, height, hints); 109 110// 转为二进制字节 111ByteArrayOutputStream out = new ByteArrayOutputStream(); 112 113if (!ImageIO.write(zoomImage, "png", out)) 114{ 115throw new IOException("Could not write an image of format png"); 116} 117 118byte[] binaryData = https://www.it610.com/article/out.toByteArray(); 119 120return binaryData; 121} 122 123/** 124* 进行Base64编码 125* @param content 126* @param width 127* @param height 128* @param hints 129* @return 130* @throws Exception 131*/ 132 133public static String getQrCodeImageBase64String(String content, int width, int height, Hashtable hints) throws Exception 134{ 135// 生成二维码图片的二进制字节 136byte[] binaryData = getQrCodeImageBytes(content, width, height, hints); 137 138// 将二进制字节进行Base64编码 139String ret = new String(Base64.encodeBase64(binaryData),"UTF-8"); 140 141return ret; 142} 143 144/** 145* 指定缩放比例，进行图片缩放 146* @param originalImage 147* @param sx 148* @param sy 149* @return 150*/ 151public static BufferedImage zoomInImage(BufferedImage originalImage, double sx, double sy) 152{ 153AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(sx, sy), null); 154BufferedImage newImage = op.filter(originalImage, null); 155 156return newImage; 157} 158 159/** 160* 自定义修改二维码的白边宽度 161* @param matrix 162* @param margin 163* @return 164*/ 165public static BitMatrix updateFrameWidth(BitMatrix matrix, int margin) 166{ 167int tempM = margin * 2; 168 169// 二维码的实际尺寸 170int[] whitesTopLeft = getFrameWidthOfTopLeft(matrix); 171int[] whitesBottomRight = getFrameWidthOfBottomRight(matrix); 172 173int whiteWidth = whitesTopLeft[0] + whitesBottomRight[0]; 174int whiteHeight = whitesTopLeft[1] + whitesBottomRight[1]; 175 176int height = matrix.getHeight() - whiteWidth + tempM; 177int width = matrix.getWidth() - whiteHeight + tempM; 178 179// 按照自定义边框生成新的BitMatrix 180BitMatrix resMatrix = new BitMatrix(width, height); 181resMatrix.clear(); 182 183// 循环，将二维码图案绘制到新的bitMatrix中 184for (int i = margin; i < width - margin; i++) 185{ 186for (int j = margin; j < height - margin; j++) 187{ 188if (matrix.get(i - margin + whitesTopLeft[0], j - margin + whitesTopLeft[1])) 189{ 190// 新的二维码 191resMatrix.set(i, j); 192} 193} 194} 195 196return resMatrix; 197} 198 199/** 200* 二维码左上角白边的尺寸 201* @param matrix 202* @return 203*/ 204private static int[] getFrameWidthOfTopLeft(BitMatrix matrix) 205{ 206// 二维码的尺寸 207int height = matrix.getHeight(); 208int width = matrix.getWidth(); 209 210// 循环，遇到第一个黑点，就返回 211for (int i = 0; i < width; i++) 212{ 213for (int j = 0; j < height; j++) 214{ 215if (matrix.get(i, j) == true) 216{ 217int[] ret = {i, j}; 218return ret; 219} 220} 221} 222 223int[] ret = {0, 0}; 224return ret; 225} 226 227/** 228* 二维码右下角白边的尺寸 229* @param matrix 230* @return 231*/ 232private static int[] getFrameWidthOfBottomRight(BitMatrix matrix) 233{ 234// 二维码的尺寸 235int height = matrix.getHeight(); 236int width = matrix.getWidth(); 237 238// 备注：不能直接查找右下角的第一个黑点，而必须分别查找右上角、左下角的第一个黑点，然后返回右下角坐标 239int right = -1; 240 241// 从右上角开始循环，遇到第一个黑点，就得到右边空白宽度 242for (int i = width; i > 0; i--) 243{ 244for (int j = 0; j < height; j++) 245{ 246if (matrix.get(i - 1, j) == true) 247{ 248right = width - i; 249break; 250} 251} 252 253if (right >= 0) 254{ 255break; 256} 257} 258 259// 从左下角开始循环，遇到第一个黑点，就得到下边空白宽度，返回 260for (int i = 0; i < width; i++) 261{ 262for (int j = height; j > 0; j--) 263{ 264if (matrix.get(i, j - 1) == true) 265{ 266int[] ret = {right, height - j}; 267return ret; 268} 269} 270} 271 272int[] ret = {0, 0}; 273return ret; 274} 275 276 }

【使用google|使用google zxing生成二维码图片】