IReport中的條碼類別BcImage

最近有一個繳費單的專案，需要列印條碼，因為IReport本身就有提供列印條碼的功能，所以就用IReport設計繳費單然後再用Jasperreport API寫批次程式去產生PDF，資料量大概3000多筆(頁)拆成幾個檔案，可是就發生了一個問題居然發生部分繳費單的條碼有問題，看了一下程式研判是Race Condition因為程式採用的是多執行緒，若是依序個別產生是不會有問題，但是同時執行的時候就會亂掉，而且都錯在條碼，令我覺得很奇怪，後來我查了一下發現it.businesslogic.ireport.barcode.BcImage 類別我猜是這裡的問題，就先加上synchronized重新編譯在去執行，嘿嘿條碼就對了，做了一下壓測也正常，程式碼如下，不過這樣事不是對了可能還要仔細查查看。

public class BcImage {
private static net.sourceforge.barbecue.Barcode bc = null;

public synchronized static net.sourceforge.barbecue.Barcode getBarcode() {
return bc;
}

public synchronized static BufferedImage getBarcodeImage(int type, Object aText, boolean showText, boolean checkSum) {
return getBarcodeImage(type, aText, showText, checkSum,"",0,0);
}

public synchronized static BufferedImage getBarcodeImage(int type, Object aText, boolean showText, boolean checkSum, String applicationIdentifier, int width, int height) {
// 2of7, 3of9, Bookland, Codabar, Code128, Code128A, Code128B, Code128C, Code39, EAN128, EAN13, GlobalTradeItemNumber, Int2of5, Int2of5, Monarch, NW7, PDF417, SCC14ShippingCode, ShipmentIdentificationNumber, SSCC18, Std2of5, Std2of5, UCC128, UPCA, USD3, USD4, USPS

String text = new StringBuffer().append(aText).toString();

try {
switch (type) {
case 0: return null;
case 1: bc = BarcodeFactory.create2of7(text); break;
case 2: bc = BarcodeFactory.create3of9(text, checkSum); break;
case 3: bc = BarcodeFactory.createBookland(text); break;
case 4: bc = BarcodeFactory.createCodabar(text); break;
case 5: bc = BarcodeFactory.createCode128(text); break;
case 6: bc = BarcodeFactory.createCode128A(text); break;
case 7: bc = BarcodeFactory.createCode128B(text); break;
case 8: bc = BarcodeFactory.createCode128C(text); break;
case 9: bc = BarcodeFactory.createCode39(text, checkSum ); break;
case 10: bc = BarcodeFactory.createEAN128(text); break;
case 11: bc = BarcodeFactory.createEAN13(text); break;
case 12: bc = BarcodeFactory.createGlobalTradeItemNumber(text); break;
case 13: bc = BarcodeFactory.createInt2of5(text, checkSum); break;
case 14: bc = BarcodeFactory.createMonarch(text); break;
case 15: bc = BarcodeFactory.createNW7(text); break;
case 16: bc = BarcodeFactory.createPDF417(text); break;
case 17: bc = BarcodeFactory.createSCC14ShippingCode(text); break;
case 18: bc = BarcodeFactory.createShipmentIdentificationNumber(text); break;
case 19: bc = new UCCEAN128Barcode(UCCEAN128Barcode.SSCC_18_AI, text, checkSum); break; //BarcodeFactory.createSSCC18(text); break;
case 20: bc = BarcodeFactory.createStd2of5(text, checkSum); break;
case 21: bc = new UCCEAN128Barcode(applicationIdentifier, text, checkSum); break; //BarcodeFactory.createUCC128(applicationIdentifier, text); break;
case 22: bc = BarcodeFactory.createUPCA(text); break;
case 23: bc = BarcodeFactory.createUSD3(text, checkSum); break;
case 24: bc = BarcodeFactory.createUSD4(text); break;
case 25: bc = BarcodeFactory.createUSPS(text); break;
case 26: bc = new net.sourceforge.barbecue.linear.code39.Code39Barcode(text, checkSum, true); break;
}

if (width > 0) bc.setBarWidth(width);
if (height > 0) bc.setBarHeight(height);
bc.setDrawingText(showText);
return net.sourceforge.barbecue.BarcodeImageHandler.getImage(bc);
}
catch (Exception e) {
e.printStackTrace();
//generate a runtime exception, invalid value passed.
//the user must be notified if fail
throw new RuntimeException(e.getMessage());
//return null;
}
}
}