1，Maven依賴

　　　　<dependency><groupId>com.google.zxing</groupId><artifactId>core</artifactId><version>3.0.0</version></dependency><dependency><groupId>com.google.zxing</groupId><artifactId>javase</artifactId><version>3.0.0</version></dependency>

?

2，使用com.google.zxing生成二維碼

import java.awt.image.BufferedImage; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.IOException; import java.io.OutputStream; import java.util.HashMap; import java.util.Map;import javax.imageio.ImageIO;import com.google.zxing.BarcodeFormat; import com.google.zxing.EncodeHintType; import com.google.zxing.MultiFormatWriter; import com.google.zxing.WriterException; import com.google.zxing.common.BitMatrix; /*** 用于二維碼生成* @author WWH**/ public class MatrixToImageWriter {public static final int BLACK = 0xFF000000; public static final int WHITE = 0xFFFFFFFF; public static final int BLUE = 0xFF0075A4;public static BufferedImage toBufferedImage(BitMatrix matrix) { int width = matrix.getWidth(); int height = matrix.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, matrix.get(x, y) ? BLACK : WHITE); } } return image; } /*** @Title: toBufferedImageV2* @Description: 去除了白邊* @param @param matrix* @param @param rgb* @param @return * @return BufferedImage * @throws*/public static BufferedImage toBufferedImageV2(BitMatrix matrix, int rgb) { int width = matrix.getWidth(); int height = matrix.getHeight(); //獲取錨點Integer a = null;Integer b = null;for (int x = 0; x < width; x++) { for (int y = 0; y < height; y++) { if(matrix.get(x, y) && a == null && b == null){a = x;b = y;}} } a = a -1;b = b -1;width = width-(2*a);height = height-(2*b);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, matrix.get(x+a, y+b) ? rgb : WHITE); } } return image; } public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException { BufferedImage image = toBufferedImage(matrix); if (!ImageIO.write(image, format, file)) { throw new IOException("Could not write an image of format " + format + " to " + file); } } public static void writeToFileV2(BitMatrix matrix, String format, File file, int rgb) throws IOException { BufferedImage image = toBufferedImageV2(matrix, rgb); if (!ImageIO.write(image, format, file)) { throw new IOException("Could not write an image of format " + format + " to " + file); } } public static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException { BufferedImage image = toBufferedImage(matrix); if (!ImageIO.write(image, format, stream)) { throw new IOException("Could not write an image of format " + format); } } /*** @Title: writeToStreamV2* @Description: 添加顏色參數【rgb】* @param @param matrix* @param @param format* @param @param stream* @param @throws IOException * @return void * @throws*/public static void writeToStreamV2(BitMatrix matrix, String format, OutputStream stream, int rgb) throws IOException { BufferedImage image = toBufferedImageV2(matrix, rgb); if (!ImageIO.write(image, format, stream)) { throw new IOException("Could not write an image of format " + format); } } public static void main(String[] args) throws WriterException, IOException{String content = "http://baidu.com/app/test.apk";String path = "C:/qrcode";MultiFormatWriter multiFormatWriter = new MultiFormatWriter();Map<EncodeHintType, String> hints = new HashMap<EncodeHintType, String>(); hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 400, 400,hints);File file1 = new File(path,"123.jpg");MatrixToImageWriter.writeToFileV2(bitMatrix, "jpg", file1, MatrixToImageWriter.BLUE);} }

　　

轉載于:https://www.cnblogs.com/wanhua-wu/p/6513774.html

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