二维码的生成与解码

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
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 QrCodeTest {

	/**
	 * @param args
	 */
	
	/**
	 * 编码
	 * @param contents  二维码内容
	 * @param width  二维码的宽度
	 * @param height  二维码的长度
	 * @param imagePath  二维码的图像存储路径
	 */
	private void encodeQrcode(String contents,int width,int height,String imagePath)
	{
		try 
		{
			MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
			BitMatrix bitMatrix = multiFormatWriter.encode(contents, BarcodeFormat.QR_CODE, width, height);
			MatrixToImageWriter.writeToFile(bitMatrix, "png", new File(imagePath));
		} 
		catch (Exception e) 
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	/**
	 * 
	 * @param imagePath  二维码的图像路径
	 * @return
	 */
	private String decode(String imagePath)
	{
		 BufferedImage image = null;   
	     Result result = null;   
	     try 
	     {
			image=ImageIO.read(new File(imagePath));
			if (image == null) 
			{   
                System.out.println("解码图片不存在!"); 
                return null;
            }   
			LuminanceSource luminanceSource = new BufferedImageLuminanceSource(image);
			BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(luminanceSource));
			MultiFormatReader formatReader = new MultiFormatReader();
			result = formatReader.decode(binaryBitmap);
			return result.getText();
	     } 
	     catch (Exception e) 
	     {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	     return null;
	}
	
	public static void main(String[] args) 
	{
		String contents="hello world!!!--------the first qrcode program by xlp.";
		String imagePath="C:\\erweima.png";
		int width = 300, height = 300;
		QrCodeTest codeTest = new QrCodeTest();
		//编码
//		codeTest.encodeQrcode(contents, width, height, imagePath);
		
		//解码
		String urlCntents = codeTest.decode(imagePath);
		System.out.println("urlCntents:"+urlCntents);
	}

}

参考相关内容：http://lizhuohuang.iteye.com/blog/1966741