Java生成二维码

实例代码：
 1 /**
 2    * GET方法测试
 3    * @author:lll
 4    * @throws IOException
 5    * @throws FileNotFoundException
 6    * @time:2017年7月20日下午1:53:30
 7    */
 8   @SuppressWarnings("deprecation")
 9   @RequestMapping(value = "/getTest", method = RequestMethod.GET)
10   public String getTest(HttpServletRequest request, Model model)
11       throws FileNotFoundException, IOException {
12     String str = "天王盖地虎.宝塔镇妖河";// 二维码内容
13     String path = "E:\files\hhs3.png"; // 保存图片位置
14     String xo = Thread.currentThread().getContextClassLoader().getResource("/").getPath() + "/img/"
15         + "hhs3.png"; // 获取图片路径
16     BitMatrix byteMatrix = null;
17     String imgPath = "E:\files\hhs3.png";
18     @SuppressWarnings("unused")
19     BufferedImage image = ImageIO.read(new FileInputStream(imgPath));
20     try {
21       Hashtable<EncodeHintType, Integer> hints = new Hashtable<EncodeHintType, Integer>();
22       hints.put(EncodeHintType.MARGIN, 1); // 设置二维码空白边框的大小 1-4，1是最小 4 是默认的国标
23 
24       // 生成二维码
25       byteMatrix = new MultiFormatWriter().encode(new String(str.getBytes("UTF-8"), "iso-8859-1"),
26           BarcodeFormat.QR_CODE, 200, 200, hints);
27 
28       File file = new File(path);
29       OutputStream stream = new OutputStream() {
30         
31         @Override
32         public void write(int b) throws IOException {
33         }
34       };
35       MatrixToImageWriter.writeToFile(byteMatrix, "png", file);
36       MatrixToImageWriter.writeToStream(byteMatrix, "png", stream); // 将对应的二维码写入图片流
37       BufferedImage img = MatrixToImageWriter.toBufferedImage(byteMatrix);
38       HttpServletResponse resp = response;
39       ImageIO.write(img, "jpeg", resp.getOutputStream()); // 输出图片
40       @SuppressWarnings("unused")
41       String head =
42           "<!doctype html><html lang="en"> <head><meta charset="UTF-8"><meta name="Generator" content="EditPlus®"><meta name="Author" content=""><meta name="Keywords" content=""><meta name="Description" content=""><title>Document</title></head><body><img src=";
43       @SuppressWarnings("unused")
44       String end = xo + "/></body></html>";
45 
46     } catch (Exception e) {
47       e.printStackTrace();
48     }
49     return null;
50   }