zxing二维码的生成和解码
转载:http://andilyliao.iteye.com/blog/1102546

适用于j2se的方法
例子:

package snippet;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.util.Hashtable;import javax.imageio.ImageIO;import com.google.zxing.BarcodeFormat;import com.google.zxing.BinaryBitmap;import com.google.zxing.DecodeHintType;import com.google.zxing.EncodeHintType;import com.google.zxing.LuminanceSource;import com.google.zxing.MultiFormatReader;import com.google.zxing.MultiFormatWriter;import com.google.zxing.Reader;import com.google.zxing.ReaderException;import com.google.zxing.Result;import com.google.zxing.WriterException;import com.google.zxing.client.j2se.BufferedImageLuminanceSource;import com.google.zxing.client.j2se.MatrixToImageWriter;import com.google.zxing.common.BitMatrix;import com.google.zxing.common.HybridBinarizer;  public class TestEnDeCode {        /**      *       */      public TestEnDeCode() {          // TODO Auto-generated constructor stub      }        /**      * @param args      */      public static void main(String[] args) {          TestEnDeCode t=new TestEnDeCode();          t.encode();          t.decode();    }        // 编码      public void encode() {          try {              String str = "小猪";// 二维码内容              String path = "hwy.png";              BitMatrix byteMatrix;              Hashtable hints = new Hashtable();              hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");              byteMatrix = new MultiFormatWriter().encode(str,                      BarcodeFormat.QR_CODE, 200, 200,hints);              File file = new File(path);                            MatrixToImageWriter.writeToFile(byteMatrix, "png", file);          } catch (Exception e) {              e.printStackTrace();          }      }        // 解码      public void decode() {          try {              Reader reader = new MultiFormatReader();              String imgPath = "hwy.png";              File file = new File(imgPath);              BufferedImage image;              try {                  image = ImageIO.read(file);                  if (image == null) {                      System.out.println("Could not decode image");                  }                  LuminanceSource source = new BufferedImageLuminanceSource(image);                  BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(                          source));                  Result result;                  Hashtable hints = new Hashtable();                  hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");                  result = new MultiFormatReader().decode(bitmap, hints);                  String resultStr = result.getText();                  System.out.println(resultStr);                } catch (IOException ioe) {                  System.out.println(ioe.toString());              } catch (ReaderException re) {                  System.out.println(re.toString());              }            } catch (Exception ex) {            }      }    }