java根据内容生成二维码图片

 1 package util;
 2 
 3 import java.awt.image.BufferedImage;  
 4 
 5 import java.io.File;
 6 import java.io.IOException;
 7 import java.io.OutputStream;
 8 
 9 import javax.imageio.ImageIO;
10 
11 import java.util.Hashtable;
12 
13 import com.google.zxing.common.BitMatrix;
14 import com.google.zxing.BarcodeFormat;
15 import com.google.zxing.EncodeHintType;
16 import com.google.zxing.MultiFormatWriter;
17 
18 /**
19  * 二维码的生成须要借助MatrixToImageWriter类，该类是由Google提供的，能够将该类直接拷贝到源码中使用
20  */
21 public class MatrixToImageWriter {
22     private static final int BLACK = 0xFF000000;
23     private static final int WHITE = 0xFFFFFFFF;
24 
25     private MatrixToImageWriter() {
26     }
27 
28     public static BufferedImage toBufferedImage(BitMatrix matrix) {
29         int width = matrix.getWidth();
30         int height = matrix.getHeight();
31         BufferedImage image = new BufferedImage(width, height,
32                 BufferedImage.TYPE_INT_RGB);
33         for (int x = 0; x < width; x++) {
34             for (int y = 0; y < height; y++) {
35                 image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
36             }
37         }
38         return image;
39     }
40 
41     public static void writeToFile(BitMatrix matrix, String format, File file)
42             throws IOException {
43         BufferedImage image = toBufferedImage(matrix);
44         if (!ImageIO.write(image, format, file)) {
45             throw new IOException("Could not write an image of format "
46                     + format + " to " + file);
47         }
48     }
49 
50     public static void writeToStream(BitMatrix matrix, String format,
51             OutputStream stream) throws IOException {
52         BufferedImage image = toBufferedImage(matrix);
53         if (!ImageIO.write(image, format, stream)) {
54             throw new IOException("Could not write an image of format " + format);
55         }
56     }
57 
58     public static void main(String[] args) throws Exception {
59         String text = "http://www.baidu.com"; // 二维码内容
60         int width = 300; // 二维码图片宽度
61         int height = 300; // 二维码图片高度
62         String format = "jpg";// 二维码的图片格式
63 
64         Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
65         hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); // 内容所使用字符集编码
66 
67         BitMatrix bitMatrix = new MultiFormatWriter().encode(text,
68                 BarcodeFormat.QR_CODE, width, height, hints);
69         // 生成二维码
70         File outputFile = new File("d:" + File.separator + "new.jpg");
71         MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile);
72     }
73 }