Itext 5.0 怎麼生成顯示條形碼

 官方的demo中有條形碼的工具，但是生成出來的樣式不好調整，這裏還是放出官方的demo地址，大家可以test試試：https://itextpdf.com/en/resources/examples/itext-5-legacy/generating-and-displaying-bar-codes

怎麼使用我們自己生成的條形碼呢？

安裝依賴

<properties>
        <zxing.version>3.3.3</zxing.version>
    </properties>

<!-- google zxing 多格式1D / 2D條碼圖像處理庫-->
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>core</artifactId>
            <version>${zxing.version}</version>
        </dependency>
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>${zxing.version}</version>
        </dependency>

封裝工具：

public class BarCodeUtil {
    /**
     * 獲取base64格式條形碼
     * @param contents
     * @return
     * @throws WriterException
     * @throws IOException
     */
    public static String getBase64Encode(String contents) throws WriterException, IOException {
        return new String("data:image/jpeg;base64,"+Base64.encode(getBytes(contents)));
    }

    /**
     * 獲取字節碼
     * @param contents
     * @return
     * @throws WriterException
     * @throws IOException
     */
    public static byte[] getBytes(String contents) throws WriterException, IOException {
        BufferedImage bufferedImage = encode(contents);
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        ImageIO.write(bufferedImage,"jpeg",outputStream);
        outputStream.close();
        return outputStream.toByteArray();
    }

    /**
     * 生成條形碼
     * @param contents 內容
     * @return
     */
    public static BufferedImage encode(String contents) throws WriterException {
        //配置參數
        Map<EncodeHintType,Object> hints = new HashMap<>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        // 容錯級別 這裏選擇最高H級別
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        //設置條碼邊距 默認爲10
        hints.put(EncodeHintType.MARGIN, 0);
        //寬度爲條碼自動生成規則的寬度
        int width = new Code128Writer().encode(contents).length;
        //高度可由前端控制 不影響編碼識別
        int height = 70;
        //條碼放大倍數
        int codeMultiples = 1;
        //條碼內容寬度
        int codeWidth = width * codeMultiples;
        // 參數分別爲 編碼內容，編碼類型，內容寬度，內容高度，設置參數
        BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,
                BarcodeFormat.CODE_128, codeWidth, height, hints);
        return  MatrixToImageWriter.toBufferedImage(bitMatrix);
    }

    /**
     * 解析條形碼
     * @param inputStream
     * @return
     */
    public static String decode(InputStream inputStream) {
        BufferedImage image = null;
        Result result = null;
        try {
            image = ImageIO.read(inputStream);
            if (image == null) {
                throw new RuntimeException("the decode image may be not exists.");
            }
            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;
    }

}

 在Itext5中根據數據生成對應條形碼，這樣生成條形碼的時候，調整起來方便很多

// 條形碼
Image barCodeImg = Image.getInstance(BarCodeUtil.getBytes(no));
barCodeImg.scaleAbsolute(120, 40);
cell = new PdfPCell(barCodeImg, false);