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; 
      } 

已經使用Barcode4j創建了一個條形碼，在這裏它創建了一個圖像code128.jpg。我可以創建一個字節數組，而不是在文件系統中創建映像並將其發送給Web服務客戶端。

Answer 1

得到了解決，使用ByteArrayOutputStream

@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; 
      } 

解決它