Java生成读取条形码和二维码图片

原文：http://www.open-open.com/code/view/1453520722495

package zxing;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.Binarizer;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.NotFoundException;
import com.google.zxing.Result;
import com.google.zxing.WriterException;
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;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;

/**
 *
 * @author wiki
 */
public class ZxingTool {

    private static final int IMAGE_WIDTH = 80;
    private static final int IMAGE_HEIGHT = 80;
    private static final int IMAGE_HALF_WIDTH = IMAGE_WIDTH / 2;
    private static final int FRAME_WIDTH = 2;
    /**
     * 生成条形码
     * @param contents 条形码内容
     * @param width 条形码宽度
     * @param height 条形码高度
     * @return
     */
    public static BufferedImage encodeBarcode(String contents, int width, int height){
        int codeWidth = 3 + // start guard
                (7 * 6) + // left bars
                5 + // middle guard
                (7 * 6) + // right bars
                3; // end guard
        codeWidth = Math.max(codeWidth, width);
        BufferedImage barcode = null;
        try {
            BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,BarcodeFormat.EAN_13, codeWidth, height, null);
           barcode= MatrixToImageWriter.toBufferedImage(bitMatrix);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return barcode;
    }

    /**
     * 解析读取条形码
     * @param barcodePath 条形码文件路径
     * @return
     */
    public static String decodeBarcode(String barcodePath){
        BufferedImage image;
        Result result = null;
        try {
            image = ImageIO.read(new File(barcodePath));
            if (image != null) {
                 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;
    }

    /**
     * 生成二维码
     * @param context 二维码内容
     * @param width 二维码图片宽度
     * @param height 二维码图片高度
     * @return
     */
    public static BufferedImage encodeQRcode(String context,int width,int height){
        BufferedImage qrCode=null;
        try {
            Hashtable hints= new Hashtable();
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
            BitMatrix bitMatrix = new MultiFormatWriter().encode(context, BarcodeFormat.QR_CODE, width, height,hints);
            qrCode = MatrixToImageWriter.toBufferedImage(bitMatrix);
        } catch (WriterException ex) {
            Logger.getLogger(ZxingTool.class.getName()).log(Level.SEVERE, null, ex);
        }
        return qrCode;
    }

    /**
     * 生成带有logo标志的二维码
     * @param context 二维码存储内容
     * @param width 二维码宽度
     * @param height 二维码高度
     * @param logoPath  二维码logo路径
     * @return
     */
    public static BufferedImage encodeLogoQRcode(String context,int width,int height,String logoPath){
         BufferedImage logoQRcode=null;
        try {
             // 读取Logo图像
            BufferedImage logoImage = scale(logoPath, IMAGE_WIDTH,IMAGE_HEIGHT, true);
            int[][] srcPixels = new int[IMAGE_WIDTH][IMAGE_HEIGHT];
            for (int i = 0; i < logoImage.getWidth(); i++) {
                for (int j = 0; j < logoImage.getHeight(); j++) {
                    srcPixels[i][j] = logoImage.getRGB(i, j);
                }
            }

            Map<EncodeHintType, Object> hint = new HashMap<EncodeHintType, Object>();
            hint.put(EncodeHintType.CHARACTER_SET, "utf-8");
            hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);  

            BitMatrix bitMatrix = new MultiFormatWriter().encode(context, BarcodeFormat.QR_CODE, width, height,hint);

             // 二维矩阵转为一维像素数组
             int halfW = bitMatrix.getWidth() / 2;
             int halfH = bitMatrix.getHeight() / 2;

             int[] pixels = new int[width * height];  

             for (int y = 0; y < bitMatrix.getHeight(); y++) {
                    for (int x = 0; x < bitMatrix.getWidth(); x++) {
                        // 读取图片
                        if (x > halfW - IMAGE_HALF_WIDTH
                                && x < halfW + IMAGE_HALF_WIDTH
                                && y > halfH - IMAGE_HALF_WIDTH
                                && y < halfH + IMAGE_HALF_WIDTH) {
                            pixels[y * width + x] = srcPixels[x - halfW
                                    + IMAGE_HALF_WIDTH][y - halfH + IMAGE_HALF_WIDTH];
                        }
                        // 在图片四周形成边框
                        else if ((x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
                                && x < halfW - IMAGE_HALF_WIDTH + FRAME_WIDTH
                                && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
                                + IMAGE_HALF_WIDTH + FRAME_WIDTH)
                                || (x > halfW + IMAGE_HALF_WIDTH - FRAME_WIDTH
                                        && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
                                        && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
                                        + IMAGE_HALF_WIDTH + FRAME_WIDTH)
                                || (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
                                        && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
                                        && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
                                        - IMAGE_HALF_WIDTH + FRAME_WIDTH)
                                || (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
                                        && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
                                        && y > halfH + IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
                                        + IMAGE_HALF_WIDTH + FRAME_WIDTH)) {
                            pixels[y * width + x] = 0xfffffff;
                        } else {
                            // 此处可以修改二维码的颜色，可以分别制定二维码和背景的颜色；
                            pixels[y * width + x] = bitMatrix.get(x, y) ? 0xff000000 : 0xfffffff;
                        }
                }
            }
            logoQRcode = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);
            logoQRcode.getRaster().setDataElements(0, 0, width, height, pixels);
        } catch (WriterException ex) {
            Logger.getLogger(ZxingTool.class.getName()).log(Level.SEVERE, null, ex);
        }
        return logoQRcode;
    }

    /**
     * 解析读取二维码
     * @param qrCodePath 二维码图片路径
     * @return
     */
    public static String decodeQRcode(String qrCodePath){
     BufferedImage image;
     String qrCodeText = null;
        try {
            image = ImageIO.read(new File(qrCodePath));
            LuminanceSource source = new BufferedImageLuminanceSource(image);
            Binarizer binarizer = new HybridBinarizer(source);
            BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
            Map<DecodeHintType, Object> hints = new HashMap<DecodeHintType, Object>();
            hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
            // 对图像进行解码
            Result result = new MultiFormatReader().decode(binaryBitmap, hints);
            qrCodeText = result.getText();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (NotFoundException e) {
            e.printStackTrace();
        }
        return qrCodeText;
    }

    /**
     * 对图片进行缩放
     * @param imgPath 图片路径
     * @param width 图片缩放后的宽度
     * @param height 图片缩放后的高度
     * @param hasFiller 是否补白
     * @return
     */
    public static BufferedImage scale(String imgPath,int width,int height,boolean hasFiller){
        double ratio = 0.0; // 缩放比例
        File file = new File(imgPath);
        BufferedImage srcImage = null;
        try {
            srcImage = ImageIO.read(file);
        } catch (IOException ex) {
            Logger.getLogger(ZxingTool.class.getName()).log(Level.SEVERE, null, ex);
        }
        Image finalImage;
        finalImage = srcImage.getScaledInstance(width, height,BufferedImage.SCALE_SMOOTH);
        // 计算比例
        if ((srcImage.getHeight() > height) || (srcImage.getWidth() > width)) {
            if (srcImage.getHeight() > srcImage.getWidth()) {
                ratio = (new Integer(height)).doubleValue()/ srcImage.getHeight();
            } else {
                ratio = (new Integer(width)).doubleValue()/ srcImage.getWidth();
            }
            AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(ratio, ratio), null);
            finalImage = op.filter(srcImage, null);
        }
        if (hasFiller) {// 补白
            BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);
            Graphics2D graphic = image.createGraphics();
            graphic.setColor(Color.white);
            graphic.fillRect(0, 0, width, height);
            if (width == finalImage.getWidth(null)){
                graphic.drawImage(finalImage, 0,(height - finalImage.getHeight(null))/2,finalImage.getWidth(null), finalImage.getHeight(null),Color.white, null);
            }else{
                graphic.drawImage(finalImage,(width - finalImage.getWidth(null))/2,0,finalImage.getWidth(null), finalImage.getHeight(null),Color.white, null);
                graphic.dispose();
                finalImage = image;
            }
        }
        return (BufferedImage) finalImage;
    }
}