使用zxing生成条形码

Question

我能够生成条形码使用zxing条形码库，我使用...

String text = "123456789101"; 

int width  = 300;
int height = 100; 
String imgFormat = "png";

BitMatrix bitMatrix = new UPCAWriter().encode(text, BarcodeFormat.UPC_A, width, height);
MatrixToImageWriter.writeToStream(bitMatrix, imgFormat, new FileOutputStream(new    File("C:\\code_.png")));
out.println("Success!");

我得到了我的输出，与平面条形码图像，但我想打印‘文本(字符串文本= "123456789101";)’也底部的图像，任何人知道请帮助我。

非常感谢。

Answer 1

如果你的库没有实现这样的东西，我想它没有，否则这里没有问题，你可以自己在条形码图像上打印你的代码。有关如何做到这一点的简要描述，请查看this问题。

另一种选择是在图像下以明文形式输出代码-不确定它是否适合您。

更新:您也可以尝试使用Barcode4j库。我认为它可以做这样的事情。

Answer 2

是一个旧线程，但如果有人还需要它的话...

import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Hashtable;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.oned.Code128Writer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

// ...
// vars width and height have image width and height (int)
// var barcodeMessage has the text under the barcode

// text
BufferedImage img = new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB); // aux implementation
Graphics2D g2d = img.createGraphics();
Font font = new Font("Times", Font.PLAIN, 11);
g2d.setFont(font);
FontMetrics fm = g2d.getFontMetrics();
int textWidth = fm.stringWidth(barcodeMessage);
int textHeight = fm.getHeight();
g2d.dispose();
img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
g2d = img.createGraphics();
g2d.setColor(backgroundColor);
g2d.fillRect(0, 0, width, height);
g2d.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE);
g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);
g2d.setFont(font);
fm = g2d.getFontMetrics();
g2d.setColor(textColor);
g2d.drawString(barcodeMessage, Math.round(Math.floor((width-textWidth)/2))-2, height-fm.getAscent());
g2d.dispose();

// barcode
Code128Writer code128Writer = new Code128Writer();
Hashtable<EncodeHintType, ErrorCorrectionLevel> hintMap = new Hashtable<EncodeHintType, ErrorCorrectionLevel>();
hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
BitMatrix bitMatrix = code128Writer.encode(barcodeMessage, BarcodeFormat.CODE_128, width, height-textHeight-(2*fm.getAscent()), hintMap);

// Make the BufferedImage that are to hold the Code128
int matrixWidth = bitMatrix.getWidth();
int matrixHeight = bitMatrix.getHeight();

Graphics2D graphics = (Graphics2D) img.getGraphics();
graphics.setColor(textColor);
for (int i = 0; i < matrixWidth; i++) {
    for (int j = 0; j < matrixHeight; j++) {
        if (bitMatrix.get(i, j)) {
            graphics.fillRect(i, j+fm.getAscent(), 1, 1);
        }
    }
}
graphics.dispose();

您可以使用宽度和高度变量、字体、条形码类型等。

Answer 3

此方法允许使用java.awt绘制一个白色矩形，并在其上绘制图像底部的编码字符串。

/**
 * 
 * @param codeS String coded to a barcode
 * @param qrfile File with generated image when completed.
 * @param width in pixels
 * @param height in pixels
 * @param fontSize in pixels
 * @throws Exception 
 */
public void generateBarCode(String codeS,
        File qrfile,
        int width,
        int height,
        int fontSize) throws Exception {
    FileOutputStream qrCode = null;
    try {
        // Encode URL in QR format
        BitMatrix matrix;
        com.google.zxing.Writer writer = new Code128Writer();
        //writer = new QRCodeWriter(); in case of BarcodeFormat.QR_CODE
        try {
            matrix = writer.encode(codeS, BarcodeFormat.CODE_128, width, height);
        } catch (WriterException e) {
            //logger.error("Error generando el QR", e);
            throw new Exception("Error generando el QR");
        }
        // Create buffered image to draw to
        BufferedImage image = new BufferedImage(width,
                height, BufferedImage.TYPE_INT_RGB);
        // Iterate through the matrix and draw the pixels to the image
        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                int grayValue = (matrix.get(x, y) ? 0 : 1) & 0xff;
                image.setRGB(x, y, (grayValue == 0 ? 0 : 0xFFFFFF));
            }
        }
        Graphics graphics = image.getGraphics();
        graphics.drawImage(image, 0, 0, null);


        Font f = new Font("Arial", Font.PLAIN, fontSize);

        FontRenderContext frc = image.getGraphics().getFontMetrics().getFontRenderContext();
        Rectangle2D rect = f.getStringBounds(codeS, frc);
        graphics.setColor(Color.WHITE);

        //add 10 pixels to width to get 5 pixels of padding in left/right
        //add 6 pixels to height to get 3 pixels of padding in top/bottom
        graphics.fillRect(
                (int)Math.ceil((image.getWidth()/2)-((rect.getWidth()+10)/2)), 
                (int)Math.ceil(image.getHeight() - (rect.getHeight()+6)), 
                (int)Math.ceil(rect.getWidth()+10), 
                (int)Math.ceil(rect.getHeight()+6));
        // add the watermark text
        graphics.setFont(f);
        graphics.setColor(Color.BLACK);
        graphics.drawString(codeS, 
                (int)Math.ceil((image.getWidth()/2)-((rect.getWidth())/2)), 
                (int)Math.ceil(image.getHeight() - 6));
        graphics.dispose();

        qrCode = new FileOutputStream(qrfile);
        ImageIO.write(image, "png", qrCode);

    } catch (Exception ex) {
        throw new Exception("Error generando el QR");
    } finally {
        try {
            qrCode.close();
        } catch (Exception ex) {
            throw new Exception("Error generando el QR");
        }
    }
}