zxing条形码的生成和解码

[b]转载:[/b][url]http://sjsky.iteye.com/blog/1142177[/url]

package michael.zxing;  

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

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;

/** 
 * @blog http://sjsky.iteye.com 
 * @author Michael 
 */  
public class ZxingEAN13EncoderHandler {  

    /** 
     * 编码 
     * @param contents 
     * @param width 
     * @param height 
     * @param imgPath 
     */  
    public void encode(String contents, int width, int height, String imgPath) {  
        int codeWidth = 3 + // start guard  
                (7 * 6) + // left bars  
                5 + // middle guard  
                (7 * 6) + // right bars  
                3; // end guard  
        codeWidth = Math.max(codeWidth, width);  
        try {  
            BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,  
                    BarcodeFormat.EAN_13, codeWidth, height, null);  

            MatrixToImageWriter  
                    .writeToFile(bitMatrix, "png", new File(imgPath));  

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

    /** 
     * @param imgPath 
     * @return String 
     */  
    public String decode(String imgPath) {  
        BufferedImage image = null;  
        Result result = null;  
        try {  
            image = ImageIO.read(new File(imgPath));  
            if (image == null) {  
                System.out.println("the decode image may be not exit.");  
            }  
            LuminanceSource source = new BufferedImageLuminanceSource(image);  
            BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));  

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

    /** 
     * @param args 
     */  
    public static void main(String[] args) {  
        String imgPath = "zxing_EAN13.png";  
        // 益达无糖口香糖的条形码  
        String contents = "6923450657713";  

        int width = 105, height = 50;  
        ZxingEAN13EncoderHandler handler = new ZxingEAN13EncoderHandler();  
        handler.encode(contents, width, height, imgPath);  
        String decode = handler.decode(imgPath);
        System.out.println(decode);
        System.out.println("Michael ,you have finished zxing EAN13 encode.");  
    }  
}