1 import java.awt.image.BufferedImage; 2  3 /** 4  * Encapsulates custom configuration used in methods of {@link MatrixToImageWriter}. 5  */ 6 public final class MatrixToImageConfig { 7  8   public static final int BLACK = 0xFF000000; 9   public static final int WHITE = 0xFFFFFFFF;10   11   private final int onColor;12   private final int offColor;13 14   /**15    * Creates a default config with on color {@link #BLACK} and off color {@link #WHITE}, generating normal16    * black-on-white barcodes.17    */18   public MatrixToImageConfig() {19     this(BLACK, WHITE);20   }21 22   /**23    * @param onColor pixel on color, specified as an ARGB value as an int24    * @param offColor pixel off color, specified as an ARGB value as an int25    */26   public MatrixToImageConfig(int onColor, int offColor) {27     this.onColor = onColor;28     this.offColor = offColor;29   }30 31   public int getPixelOnColor() {32     return onColor;33   }34 35   public int getPixelOffColor() {36     return offColor;37   }38 39   int getBufferedImageColorModel() {40     // Use faster BINARY if colors match default41     return onColor == BLACK && offColor == WHITE ? BufferedImage.TYPE_BYTE_BINARY : BufferedImage.TYPE_INT_RGB;42   }43 44 }

 1 import java.awt.image.BufferedImage; 2 import java.io.File; 3 import java.io.IOException; 4 import java.io.OutputStream; 5  6 import javax.imageio.ImageIO; 7  8 import com.google.zxing.common.BitMatrix; 9 public class MatrixToImageWriter {10      private static final int BLACK = 0xFF000000;11        private static final int WHITE = 0xFFFFFFFF;12      13        private MatrixToImageWriter() {}14      15        16        public static BufferedImage toBufferedImage(BitMatrix matrix) {17          int width = matrix.getWidth();18          int height = matrix.getHeight();19          BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);20          for (int x = 0; x < width; x++) {21            for (int y = 0; y < height; y++) {22              image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);23            }24          }25          return image;26        }27      28        29        public static void writeToFile(BitMatrix matrix, String format, File file)30            throws IOException {31          BufferedImage image = toBufferedImage(matrix);32          if (!ImageIO.write(image, format, file)) {33            throw new IOException("Could not write an image of format " + format + " to " + file);34          }35        }36      37        38        public static void writeToStream(BitMatrix matrix, String format, OutputStream stream)39            throws IOException {40          BufferedImage image = toBufferedImage(matrix);41          if (!ImageIO.write(image, format, stream)) {42            throw new IOException("Could not write an image of format " + format);43          }44        }45 }

 1 import java.io.File; 2 import java.util.Hashtable; 3  4 import com.google.zxing.BarcodeFormat; 5 import com.google.zxing.EncodeHintType; 6 import com.google.zxing.MultiFormatWriter; 7 import com.google.zxing.common.BitMatrix; 8  9 public class Test {10 11     public static void main(String[] args) throws Exception{12         String text = "http://www.baidu.com";//二维码的内容13         int width = 400;  14         int height = 400;  15         String format = "png";    16         Hashtable hints= new Hashtable();  17         hints.put(EncodeHintType.CHARACTER_SET, "utf-8");  18         BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height,hints);  19         File outputFile = new File("E:/codeImg");  20         MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile); 21         System.out.println("It is ok!");22 23     }24 }