java 二维码

  1 /**
  2  * 
  3  */
  4 package com.b510.qrcode;
  5 
  6 import java.awt.image.BufferedImage;
  7 import java.io.File;
  8 import java.io.IOException;
  9 import java.util.Hashtable;
 10 import java.util.Map;
 11 
 12 import javax.imageio.ImageIO;
 13 
 14 import com.google.zxing.BarcodeFormat;
 15 import com.google.zxing.BinaryBitmap;
 16 import com.google.zxing.DecodeHintType;
 17 import com.google.zxing.EncodeHintType;
 18 import com.google.zxing.LuminanceSource;
 19 import com.google.zxing.MultiFormatReader;
 20 import com.google.zxing.MultiFormatWriter;
 21 import com.google.zxing.ReaderException;
 22 import com.google.zxing.Result;
 23 import com.google.zxing.Writer;
 24 import com.google.zxing.WriterException;
 25 import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
 26 import com.google.zxing.common.BitMatrix;
 27 import com.google.zxing.common.HybridBinarizer;
 28 import com.google.zxing.oned.CodaBarWriter;
 29 import com.google.zxing.oned.Code128Writer;
 30 import com.google.zxing.oned.Code39Writer;
 31 import com.google.zxing.oned.EAN13Writer;
 32 import com.google.zxing.oned.EAN8Writer;
 33 import com.google.zxing.oned.ITFWriter;
 34 import com.google.zxing.oned.UPCAWriter;
 35 import com.google.zxing.pdf417.encoder.PDF417Writer;
 36 import com.google.zxing.qrcode.QRCodeWriter;
 37 
 38 /**
 39  * 利用zxing开源工具生成二维码QRCode
 40  * 
 41  * @date 2012-10-26
 42  * @author xhw
 43  * 
 44  */
 45 public class QRCode {
 46     private static final int BLACK = 0xff000000;
 47     private static final int WHITE = 0xFFFFFFFF;
 48 
 49     /**
 50      * @param args
 51      */
 52     public static void main(String[] args) {
 53         QRCode test = new QRCode();
 54         File file = new File("C://test.png");
 55         /**
 56          * 在com.google.zxing.MultiFormatWriter类中，定义了一些我们不知道的码,二维码只是其中的一种<br>
 57          * public BitMatrix encode(String contents,
 58                           BarcodeFormat format,
 59                           int width, int height,
 60                           Map<EncodeHintType,?> hints) throws WriterException {
 61             Writer writer;
 62             switch (format) {
 63               case EAN_8:
 64                 writer = new EAN8Writer();
 65                 break;
 66               case EAN_13:
 67                 writer = new EAN13Writer();
 68                 break;
 69               case UPC_A:
 70                 writer = new UPCAWriter();
 71                 break;
 72               case QR_CODE:  //这里是二维码
 73                 writer = new QRCodeWriter();
 74                 break;
 75               case CODE_39:
 76                 writer = new Code39Writer();
 77                 break;
 78               case CODE_128:  //这个可以生成
 79                 writer = new Code128Writer();
 80                 break;
 81               case ITF:
 82                 writer = new ITFWriter();
 83                 break;
 84               case PDF_417:  //这个可以生成
 85                 writer = new PDF417Writer();
 86                 break;
 87               case CODABAR:
 88                 writer = new CodaBarWriter();
 89                 break;
 90               default:
 91                 throw new IllegalArgumentException("No encoder available for format " + format);
 92             }
 93             return writer.encode(contents, format, width, height, hints);
 94           }
 95 
 96          */
 97         test.encode("helloworld,I‘m Hongten.welcome to my zone:http://www.cnblogs.com/hongten", file, BarcodeFormat.QR_CODE, 200, 200, null);
 98         test.decode(file);
 99     }
100 
101     /**
102      * 生成QRCode二维码<br> 
103      * 在编码时需要将com.google.zxing.qrcode.encoder.Encoder.java中的<br>
104      *  static final String DEFAULT_BYTE_MODE_ENCODING = "ISO8859-1";<br>
105      *  修改为UTF-8，否则中文编译后解析不了<br>
106      */
107     public void encode(String contents, File file, BarcodeFormat format, int width, int height, Map<EncodeHintType, ?> hints) {
108         try {
                 //消除乱码
　　　　　　　　　 contents = new String(contents.getBytes("UTF-8"), "ISO-8859-1"); 
109             BitMatrix bitMatrix = new MultiFormatWriter().encode(contents, format, width, height);
110             writeToFile(bitMatrix, "png", file);
111         } catch (Exception e) {
112             e.printStackTrace();
113         }
114     }
115 
116     /**
117      * 生成二维码图片<br>
118      * 
119      * @param matrix
120      * @param format
121      *            图片格式
122      * @param file
123      *            生成二维码图片位置
124      * @throws IOException
125      */
126     public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {
127         BufferedImage image = toBufferedImage(matrix);
128         ImageIO.write(image, format, file);
129     }
130 
131     /**
132      * 生成二维码内容<br>
133      * 
134      * @param matrix
135      * @return
136      */
137     public static BufferedImage toBufferedImage(BitMatrix matrix) {
138         int width = matrix.getWidth();
139         int height = matrix.getHeight();
140         BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
141         for (int x = 0; x < width; x++) {
142             for (int y = 0; y < height; y++) {
143                 image.setRGB(x, y, matrix.get(x, y) == true ? BLACK : WHITE);
144             }
145         }
146         return image;
147     }
148 
149     /**
150      * 解析QRCode二维码
151      */
152     @SuppressWarnings("unchecked")
153     public void decode(File file) {
154         try {
155             BufferedImage image;
156             try {
157                 image = ImageIO.read(file);
158                 if (image == null) {
159                     System.out.println("Could not decode image");
160                 }
161                 LuminanceSource source = new BufferedImageLuminanceSource(image);
162                 BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
163                 Result result;
164                 @SuppressWarnings("rawtypes")
165                 Hashtable hints = new Hashtable();
166                 //解码设置编码方式为：utf-8
167                 hints.put(DecodeHintType.CHARACTER_SET, "utf-8");
168                 result = new MultiFormatReader().decode(bitmap, hints);
169                 String resultStr = result.getText();
170                 System.out.println("解析后内容：" + resultStr);
171             } catch (IOException ioe) {
172                 System.out.println(ioe.toString());
173             } catch (ReaderException re) {
174                 System.out.println(re.toString());
175             }
176         } catch (Exception ex) {
177             System.out.println(ex.toString());
178         }
179     }
180 }