由maven构建项目，需要引入两个包，配置代码如下：
<dependency> <groupId>com.google.zxing</groupId> <artifactId>javase</artifactId> <version>2.1</version> </dependency> <dependency> <groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>2.1</version> </dependency>
代码如下：
1 package qrcode; 2 3 import java.awt.image.BufferedImage; 4 import java.io.File; 5 import java.io.IOException; 6 import java.util.Hashtable; 7 import java.util.Map; 8 9 import javax.imageio.ImageIO; 10 11 import com.google.zxing.BarcodeFormat; 12 import com.google.zxing.BinaryBitmap; 13 import com.google.zxing.DecodeHintType; 14 import com.google.zxing.EncodeHintType; 15 import com.google.zxing.LuminanceSource; 16 import com.google.zxing.MultiFormatReader; 17 import com.google.zxing.MultiFormatWriter; 18 import com.google.zxing.ReaderException; 19 import com.google.zxing.Result; 20 import com.google.zxing.client.j2se.BufferedImageLuminanceSource; 21 import com.google.zxing.common.BitMatrix; 22 import com.google.zxing.common.HybridBinarizer; 23 24 /** 25 * 利用zxing开源工具生成二维码QRCode 26 * 27 * @date 2013-04-11 28 * @author lxl 29 * 30 */ 31 public class QRCode { 32 private static final int BLACK = 0xff000000; 33 private static final int WHITE = 0xFFFFFFFF; 34 35 /** 36 * @param args 37 */ 38 public static void main(String[] args) { 39 QRCode test = new QRCode(); 40 File file = new File("C://test.png"); 41 /** 42 * 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> 43 * public BitMatrix encode(String contents, 44 BarcodeFormat format, 45 int width, int height, 46 Map<EncodeHintType,?> hints) throws WriterException { 47 Writer writer; 48 switch (format) { 49 case EAN_8: 50 writer = new EAN8Writer(); 51 break; 52 case EAN_13: 53 writer = new EAN13Writer(); 54 break; 55 case UPC_A: 56 writer = new UPCAWriter(); 57 break; 58 case QR_CODE: //这里是二维码 59 writer = new QRCodeWriter(); 60 break; 61 case CODE_39: 62 writer = new Code39Writer(); 63 break; 64 case CODE_128: //这个可以生成 65 writer = new Code128Writer(); 66 break; 67 case ITF: 68 writer = new ITFWriter(); 69 break; 70 case PDF_417: //这个可以生成 71 writer = new PDF417Writer(); 72 break; 73 case CODABAR: 74 writer = new CodaBarWriter(); 75 break; 76 default: 77 throw new IllegalArgumentException("No encoder available for format " + format); 78 } 79 return writer.encode(contents, format, width, height, hints); 80 } 81 82 */ 83 test.encode("中文二维码信息", file, BarcodeFormat.QR_CODE, 200, 200, null); 84 test.decode(file); 85 } 86 87 /** 88 * 生成QRCode二维码<br> 89 * 在编码时需要将com.google.zxing.qrcode.encoder.Encoder.java中的<br> 90 * static final String DEFAULT_BYTE_MODE_ENCODING = "ISO8859-1";<br> 91 * 修改为UTF-8，否则中文编译后解析不了<br> 92 */ 93 public void encode(String contents, File file, BarcodeFormat format, int width, int height, Map<EncodeHintType, ?> hints) { 94 try { 95 contents=new String(contents.getBytes("UTF-8"),"ISO-8859-1");//如果不想更改源码，则将字符串转换成ISO-8859-1编码 96 97 BitMatrix bitMatrix = new MultiFormatWriter().encode(contents, format, width, height); 98 writeToFile(bitMatrix, "png", file); 99 } catch (Exception e) { 100 e.printStackTrace(); 101 } 102 } 103 104 /** 105 * 生成二维码图片<br> 106 * 107 * @param matrix 108 * @param format 109 * 图片格式 110 * @param file 111 * 生成二维码图片位置 112 * @throws IOException 113 */ 114 public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException { 115 BufferedImage image = toBufferedImage(matrix); 116 ImageIO.write(image, format, file); 117 } 118 119 /** 120 * 生成二维码内容<br> 121 * 122 * @param matrix 123 * @return 124 */ 125 public static BufferedImage toBufferedImage(BitMatrix matrix) { 126 int width = matrix.getWidth(); 127 int height = matrix.getHeight(); 128 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB); 129 for (int x = 0; x < width; x++) { 130 for (int y = 0; y < height; y++) { 131 image.setRGB(x, y, matrix.get(x, y) == true ? BLACK : WHITE); 132 } 133 } 134 return image; 135 } 136 137 /** 138 * 解析QRCode二维码 139 */ 140 @SuppressWarnings("unchecked") 141 public void decode(File file) { 142 try { 143 BufferedImage image; 144 try { 145 image = ImageIO.read(file); 146 if (image == null) { 147 System.out.println("Could not decode image"); 148 } 149 LuminanceSource source = new BufferedImageLuminanceSource(image); 150 BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source)); 151 Result result; 152 @SuppressWarnings("rawtypes") 153 Hashtable hints = new Hashtable(); 154 //解码设置编码方式为：utf-8 155 hints.put(DecodeHintType.CHARACTER_SET, "utf-8"); 156 result = new MultiFormatReader().decode(bitmap, hints); 157 String resultStr = result.getText(); 158 System.out.println("解析后内容：" + resultStr); 159 } catch (IOException ioe) { 160 System.out.println(ioe.toString()); 161 } catch (ReaderException re) { 162 System.out.println(re.toString()); 163 } 164 } catch (Exception ex) { 165 System.out.println(ex.toString()); 166 } 167 } 168 }