条形码和二维码编码解码

/**
 * 条形码和二维码编码解码
 * 
 * @author stronginfo
 * @version 2014-02-28
 */
public class ZxingHandler {

/**
 * 条形码编码
 * 
 * @param contents
 * @param width
 * @param height
 * @param imgPath
 */
public static 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();
        }
    }

/**
 * 条形码解码
 * 
 * @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;
    }

/**
 * 二维码编码
 * 
 * @param contents
 * @param width
 * @param height
 * @param imgPath
 */
public static void encode2(String contents, int width, int height, String imgPath) {
        Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
// 指定纠错等级
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
// 指定编码格式
        hints.put(EncodeHintType.CHARACTER_SET, "GBK");
try {
            BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,
                    BarcodeFormat.QR_CODE, width, height, hints);

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

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

/**
 * 二维码解码
 * 
 * @param imgPath
 * @return String
 */
public static String decode2(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));

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

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

/**
 * @param args
 */
public static void main(String[] args) {

// 条形码
        String imgPath = "target\\zxing_EAN13.png";
        String contents = "6923450657713";
int width = 105, height = 50;

        ZxingHandler.encode(contents, width, height, imgPath);
        System.out.println("finished zxing EAN-13 encode.");

        String decodeContent = ZxingHandler.decode(imgPath);
        System.out.println("解码内容如下：" + decodeContent);
        System.out.println("finished zxing EAN-13 decode.");

// 二维码
        String imgPath2 = "target\\zxing.png";
        String contents2 = "Hello Gem, welcome to Zxing!"
                + "\nBlog [ http://stronginfo.iteye.com ]"
                + "\nEMail [ [e-mail] ]";
int width2 = 300, height2 = 300;

        ZxingHandler.encode2(contents2, width2, height2, imgPath2);
        System.out.println("finished zxing encode.");

        String decodeContent2 = ZxingHandler.decode2(imgPath2);
        System.out.println("解码内容如下：" + decodeContent2);
        System.out.println("finished zxing decode.");

    }

}