package sedion.jeffli.wmuitp.util.zxing;

import java.io.File;
import java.util.Hashtable;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

/**
 * @author Jeff Lee
 */
public class ZxingEncoderHelper 
{

    /**
     * 生成二维码图片
     * @param content        内容
     * @param width          宽度
     * @param height         高度
     * @param imgPath        存储图片路径
     */
    public void encode(String content, int width, int height, String imgPath) 
    {
        
        Hashtable<EncodeHintType, Object> hts = new Hashtable<EncodeHintType, Object>();
        hts.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);                // 纠错等级
        hts.put(EncodeHintType.CHARACTER_SET, "utf-8");                                  // 指定编码格式为UTF-8
        
        try
        {
            
            BitMatrix bitMatrix = new MultiFormatWriter().encode(content,                //编码内容,编码类型(这里指定为二维码),
                    BarcodeFormat.QR_CODE, width, height, hts);                          //图片宽度,图片高度,设置参数 

            MatrixToImageWriter
                    .writeToFile(bitMatrix, "png", new File(imgPath));                    //生成的二维码图片

        }
        catch (Exception e) 
        {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) 
    {
        String imgPath = "d:/33.png";
        String contents = "你好！我的博客：http://www.cnblogs.com/Alandre/";
        int width = 300, height = 300;
        ZxingEncoderHelper handler = new ZxingEncoderHelper();
        handler.encode(contents, width, height, imgPath); 
    }
}

 #BitMatrix  设置参数顺序分别为：编码内容，编码类型，生成图片宽度，生成图片高度，设置参数  

 #MatrixToImageWriter 生成所需要的文件

 你会找到这个图片

二维码（QRCode）的解码

　　/**
     * 解码
     * @param imgPath        二维码图片路径
     * @return
     */

package sedion.jeffli.wmuitp.util.zxing;

import java.awt.image.BufferedImage;
import java.io.File;
import java.util.Hashtable;

import javax.imageio.ImageIO;

import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.HybridBinarizer;

/**
 * @author Jeff Lee
 */
public class ZxingDecoderHandler 
{

    /**
     * 解码
     * @param imgPath        二维码图片路径
     * @return
     */
    public String decode(String imgPath) 
    {
        
        BufferedImage image = null;
        Result result = null;
        
        try 
        {
            image = ImageIO.read(new File(imgPath));
            if (image == null) 
            {
                System.out.println("文件不存在！");                                //应该抛个异常的
            }
            
            LuminanceSource source = new BufferedImageLuminanceSource(image);
            BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

            Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
            hints.put(DecodeHintType.CHARACTER_SET, "utf-8");

            result = new MultiFormatReader().decode(bitmap, hints);
            return result.getText();
        }
        catch (Exception e) 
        {
            e.printStackTrace();
        }
        
        return null;
    }

    public static void main(String[] args) 
    {
        String imgPath = "d:/33.png";
        
        ZxingDecoderHandler handler = new ZxingDecoderHandler();
        String content = handler.decode(imgPath);
        
        System.out.println("内容如下：");
        System.out.println(content);  
    }
}

#和生成的相反

总结

　　二维码生成

　　二维码解码