java 使用qrcode生成二维码图片或者base64字符串

1 public static String barcode2Base64(String msg) throwsException{
2         Qrcode x = newQrcode();
3         //N代表数字，A代表a-z，B代表其他字符
4         x.setQrcodeEncodeMode('B');
5         //设置纠错等级
6         x.setQrcodeErrorCorrect('M');
7         //设置版本号(1-40)
8         x.setQrcodeVersion(7);
9         
10         int width = 67+12*(7-1);
11         int height = 67+12*(7-1);
12         int pixoff = 2;//偏移量
13         
14         BufferedImage bufferedImage = newBufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
15         Graphics2D gs =bufferedImage.createGraphics();
16 gs.setBackground(Color.WHITE);
17 gs.setColor(Color.BLACK);
18         gs.clearRect(0, 0, width, height);
19         
20         byte[] d = msg.getBytes("UTF-8"); 
21         if(d.length>0&&d.length<120){
22             boolean[][] s =x.calQrcode(d);
23             for(int i=0;i<s.length;i++){
24                 for(int j=0;j<s.length;j++){
25                     if(s[j][i]){
26                         gs.fillRect(j*3+pixoff, i*3+pixoff, 3, 3);
27 }
28 }
29 }
30 }
31         //加密
32 gs.dispose();
33 bufferedImage.flush();
34         ByteArrayOutputStream bos = newByteArrayOutputStream();
35         ImageIO.write(bufferedImage, "bmp", bos);//bos可以是文件输出流，这里写到字节流
36         //加密
37         BASE64Encoder encoder = newBASE64Encoder();
38         returnencoder.encode(bos.toByteArray());
39     }