package cn.qrcode;

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;

/**
 */
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 args
     */
    public static void main(String[] args) {
    	String imgPath = "src/zxing_EAN13.png";
        encode();
        System.out.println(decode(imgPath));
    }

	private static void encode() {
		String imgPath = "src/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);
	}
    
    /** 
     * 解码
     * @param imgPath 
     * @return String 
     */  
    public static 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;  
    }  
}