开启钱箱(CashDrawer)核心代码

这里的代码只是POS驱动中的一部份

private static void openDrawer(String portName, PosPrinter pp/*这是POS机的配置*/)
        throws Exception {
    CommPortIdentifier port = null;
    CommPort open = null;
    try {
        port = CommPortIdentifier.getPortIdentifier(portName);
        open = port.open(portName, 100);
        open.setInputBufferSize(32);
        open.setOutputBufferSize(32);
        OutputStream outputStream = open.getOutputStream();
        //设置开启钱箱的脉冲频率，一般不用设置，默认就行
        if (pp.getPc().hasDrawerConfig()) {
            if (pp.getPc().getDrawerRate() == 2400) {
                outputStream.write(EpsonPosPrinterCommand.ESC_DRAWER_RATE_2400);
            } else {
                outputStream.write(EpsonPosPrinterCommand.ESC_DRAWER_RATE_9600);
            }
            int ontime = pp.getPc().getDrawerOntime();
            int offtime = pp.getPc().getDrawerOfftime();
            outputStream.write(EpsonPosPrinterCommand
                    .generatePulse(ontime, offtime));
            outputStream.write(EpsonPosPrinterCommand.ESC_OPEN_DRAWER);
        } else {//默认设置
            outputStream.write(EpsonPosPrinterCommand.ESC_DRAWER_RATE_9600);
            int ontime = 50;
            int offtime = 50;
            outputStream.write(EpsonPosPrinterCommand.generatePulse(ontime, offtime));
            outputStream.write(EpsonPosPrinterCommand.ESC_OPEN_DRAWER);
        }
        outputStream.flush();
        java.util.concurrent.TimeUnit.SECONDS.sleep(1);
        outputStream.close();
    } catch (Exception e) {
        e.printStackTrace();
        if (e instanceof IOException
            && e.getMessage()
                    .startsWith("Resource temporarily unavailable")) {
        } else {
            throw e;
        }
    } finally {
        if (port != null && port.isCurrentlyOwned()) {
            open.close();
        }
    }
}