java - 如何打开连接到电脑的钱箱

Question

我最近创建了一个 java 程序，它可以打印收据并打开连接到打印机的现金抽屉。

现在我需要打开将通过 RJ11 直接连接到计算机的现金抽屉。

因为我不会将现金抽屉连接到打印机，所以我的 feedPrinter 将毫无用处。那么我该如何调用并向现金抽屉发送命令呢？

这是我的代码

public String openDrawer()
{
    final byte[] openCD={27,112,0,60,120};
    String s=new String(openCD);
    commandSet+=s;
    return s;
}


public static void main(String args[])
{
    PrinterOptions p=new PrinterOptions();
    p.openDrawer();
    feedPrinter(p.finalCommandSet().getBytes());
}


 private static boolean feedPrinter(byte[] b)
{
    try
    {

        AttributeSet attrSet = new HashPrintServiceAttributeSet(new PrinterName("PRINTERNAME", null));
//what should I change PRINTERNAME to connect directly to cash drawer
        DocPrintJob job = PrintServiceLookup.lookupPrintServices(null, attrSet)[0].createPrintJob();
        DocFlavor flavor = DocFlavor.BYTE_ARRAY.AUTOSENSE;
        Doc doc = new SimpleDoc(b, flavor, null);
        PrintJobWatcher pjDone = new PrintJobWatcher(job);

        job.print(doc, null);
        pjDone.waitForDone();
        System.out.println("Done !");
    }
    catch(javax.print.PrintException pex)
    {

        System.out.println("Printer Error " + pex.getMessage());
        return false;
    }
    catch(Exception e)
    {
    e.printStackTrace();
    return false;
    }
    return true;
}

public String finalCommandSet()
{
    return commandSet;
}

Answer 1

首先，也是最重要的，从 http://keyhut.com/popopen4.htm

Drawer code for my printer is = 27,112,0,100,250

然后，使用下面的代码打开您的现金抽屉。

public void openCashDrawer() {

        byte[] open = {27,112,0,100,(byte) 250};
//      byte[] cutter = {29, 86,49};
        PrintService pservice = 
        PrintServiceLookup.lookupDefaultPrintService(); 
        DocPrintJob job = pservice.createPrintJob();
        DocFlavor flavor = DocFlavor.BYTE_ARRAY.AUTOSENSE;
        Doc doc = new SimpleDoc(open,flavor,null);
        PrintRequestAttributeSet aset = new 
        HashPrintRequestAttributeSet();
        try {
            job.print(doc, aset);
        } catch (PrintException ex) {
            System.out.println(ex.getMessage());
        }
    }

这应该有效。

谢谢。