谷歌zxing生成/读取二维码-------删除二维码白边

 

1、借助第三方jar，如zxing

zxing:https://github.com/zxing

1. package com.han.utils;

2.  

3. import java.awt.image.BufferedImage;

4. import java.io.File;

5. import java.io.IOException;

6. import java.nio.file.Path;

7. import java.util.HashMap;

8. import java.util.Map;

9.  

10. import javax.imageio.ImageIO;

11.  

12. import com.google.zxing.BarcodeFormat;

13. import com.google.zxing.BinaryBitmap;

14. import com.google.zxing.EncodeHintType;

15. import com.google.zxing.MultiFormatReader;

16. import com.google.zxing.MultiFormatWriter;

17. import com.google.zxing.Result;

18. import com.google.zxing.client.j2se.BufferedImageLuminanceSource;

19. import com.google.zxing.client.j2se.MatrixToImageWriter;

20. import com.google.zxing.common.BitMatrix;

21. import com.google.zxing.common.HybridBinarizer;

22. import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

23.  

24. public class ZxingQrCodeUtil {

25. /*

26. * 定义二维码的宽高

27. */

28. private static int WIDTH=300;

29. private static int HEIGHT=300;

30. private static String FORMAT="png";//二维码格式

31. //生成二维码

32. public static void createZxingqrCode(String content){

33. //定义二维码参数

34. Map hints=new HashMap();

35. hints.put(EncodeHintType.CHARACTER_SET, "utf-8");//设置编码

36. hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);//设置容错等级

37. hints.put(EncodeHintType.MARGIN, 2);//设置边距默认是5

38.  

39. try {

40. BitMatrix bitMatrix=new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, WIDTH, HEIGHT, hints);

41. bitMatrix = deleteWhite(bitMatrix);//删除白边  方法在下面

42. Path path = new File("E:\\qr.png").toPath();

43. MatrixToImageWriter.writeToPath(bitMatrix, FORMAT, path);//写到指定路径下

44.  

45. } catch (Exception e) {

46. e.printStackTrace();

47. }

48.  

49. }

50.  

51. /**删除二维码的白边*/

52. private static BitMatrix deleteWhite(BitMatrix matrix) {
            int[] rec = matrix.getEnclosingRectangle();
            int resWidth = rec[2] + 1;
            int resHeight = rec[3] + 1;

            BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);
            resMatrix.clear();
            for (int i = 0; i < resWidth; i++) {
                for (int j = 0; j < resHeight; j++) {
                    if (matrix.get(i + rec[0], j + rec[1]))
                        resMatrix.set(i, j);
                }
            }
            return resMatrix;
        }

53.  

54.  

55. //读取二维码

56. public static void readZxingQrCode(){

57. MultiFormatReader reader = new MultiFormatReader();

58. File file = new File("E:\\qr.png");

59. try {

60. BufferedImage image = ImageIO.read(file);

61. BinaryBitmap binaryBitmap=new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(image)));

62. Map hints=new HashMap();

63. hints.put(EncodeHintType.CHARACTER_SET, "utf-8");//设置编码

64. Result result= reader.decode(binaryBitmap,hints);

65. System.out.println("解析结果:"+result.toString());

66. System.out.println("二维码格式:"+result.getBarcodeFormat());

67. System.out.println("二维码文本内容:"+result.getText());

68. } catch (Exception e) {

69. // TODO Auto-generated catch block

70. e.printStackTrace();

71. }

72. }

73. }