使用B4j創建一個字節數組條形碼

Question

@Override
    public String generateBrcodeForId(String Id) {
        BarcodeUtil util = BarcodeUtil.getInstance();
        BarcodeGenerator gen;
        ByteArrayOutputStream byteArrayOutputStream = null;
        try {
            gen = util.createBarcodeGenerator(buildCfg("code128"));
        OutputStream fout;
            fout = new FileOutputStream("code128.jpg");
              byteArrayOutputStream = new ByteArrayOutputStream();
        int resolution = 200;
        BitmapCanvasProvider canvas = new BitmapCanvasProvider(
                fout, "image/jpeg", resolution, BufferedImage.TYPE_BYTE_BINARY, false, 0);
        gen.generateBarcode(canvas, "12345678");
            canvas.finish();
        } catch (ConfigurationException | BarcodeException | IOException  e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
    }


     private static Configuration buildCfg(String type) {
            DefaultConfiguration cfg = new DefaultConfiguration("barcode");

            //Bar code type
            DefaultConfiguration child = new DefaultConfiguration(type);
              cfg.addChild(child);

              //Human readable text position
              DefaultConfiguration attr = new DefaultConfiguration("human-readable");
              DefaultConfiguration subAttr = new DefaultConfiguration("placement");
                subAttr.setValue("bottom");
                attr.addChild(subAttr);

                child.addChild(attr);
            return cfg;
          }

使用Barcode4j創建了條形碼，這里創建了一個圖像code128.jpg。 我可以創建一個字節數組而不是在文件系統中創建一個圖像並將其發送到Web服務客戶端。

Answer 1

得到了解決方案，使用ByteArrayOutputStream解決了它

@Override
    public byte[] generateBarcodeForId(String Id) {
        BarcodeUtil util = BarcodeUtil.getInstance();
        BarcodeGenerator gen;
        ByteArrayOutputStream bao = null;
        try {
            gen = util.createBarcodeGenerator(buildCfg("code128"));
        OutputStream fout;
        int resolution = 100;
        bao = new ByteArrayOutputStream();
        BitmapCanvasProvider canvas = new BitmapCanvasProvider(
                bao, "image/jpeg", resolution, BufferedImage.TYPE_BYTE_BINARY, false, 0);
        gen.generateBarcode(canvas, Id);
        canvas.finish();

        } catch (ConfigurationException | BarcodeException | IOException  e) {
            e.printStackTrace();
        } finally {  
            try {
                bao.close();
            } catch (IOException e) {
                e.printStackTrace();
            }  
        }  


        return bao.toByteArray();
    }

     private static Configuration buildCfg(String type) {
            DefaultConfiguration cfg = new DefaultConfiguration("barcode");

            //Bar code type
            DefaultConfiguration child = new DefaultConfiguration(type);
              cfg.addChild(child);

              //Human readable text position
              DefaultConfiguration attr = new DefaultConfiguration("human-readable");
              DefaultConfiguration subAttr = new DefaultConfiguration("placement");
                subAttr.setValue("bottom");
                attr.addChild(subAttr);

                child.addChild(attr);
            return cfg;
          }