热敏打印机java [英] thermal printer java

问题描述

请使用此代码帮助尝试使用热敏打印机进行打印，我在系统托盘中打印了一份打印作业，但我的热敏打印机无法打印。
PrintReceiptUtil类：

Please help trying to print in a thermal printer using this code, I get a print job in my system tray but my thermal printer doesnt print. PrintReceiptUtil class:

import java.awt.JobAttributes;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.print.Doc;
import javax.print.DocFlavor;
import javax.print.DocPrintJob;
import javax.print.PrintException;
import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import javax.print.SimpleDoc;

import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;
import javax.print.attribute.standard.Copies;

import javax.print.event.PrintJobAdapter;
import javax.print.event.PrintJobEvent;


public static void doPrintReceipt() throws IOException, PrintException{

    String defaultPrinter = PrintServiceLookup.lookupDefaultPrintService().getName();
    System.out.println("Default printer: " + defaultPrinter);
    PrintService service = PrintServiceLookup.lookupDefaultPrintService();
    // prints the famous hello world! plus a form feed
    InputStream is = new ByteArrayInputStream("hello world!\f".getBytes("UTF8"));

    PrintRequestAttributeSet  pras = new HashPrintRequestAttributeSet();

    pras.add(new Copies(1));

    DocFlavor flavor = DocFlavor.INPUT_STREAM.AUTOSENSE;
    Doc doc = new SimpleDoc(is, flavor, null);
    DocPrintJob job = service.createPrintJob();

    PrintJobWatcher pjw = new PrintJobWatcher(job);
    job.print(doc, pras);
    pjw.waitForDone();
    is.close();
} 
}

PrintJobWatcher类：用于监控打印作业我得到打印完成但我的热敏打印机不打印任何东西

PrintJobWatcher Class: for monitoring print jobs I get to "printing done" but my thermal printer does not print anything

import javax.print.DocPrintJob;
import javax.print.event.PrintJobAdapter;
import javax.print.event.PrintJobEvent;

public PrintJobWatcher(DocPrintJob job){

    job.addPrintJobListener(new PrintJobAdapter() {
        public void printJobCanceled(PrintJobEvent pje) {
            allDone();
        }
        public void printJobCompleted(PrintJobEvent pje) {
            allDone();
        }
        public void printJobFailed(PrintJobEvent pje) {
            allDone();
        }
        public void printJobNoMoreEvents(PrintJobEvent pje) {
            allDone();
        }
        void allDone() {
            synchronized (PrintJobWatcher.this) {
                done = true;
                System.out.println("Printing done ...");
                PrintJobWatcher.this.notify();
            }
        }
    });
}

public synchronized void waitForDone() {
    try {
        while (!done) {
            wait();
        }
    } catch (InterruptedException e) {
    }
}
}

推荐答案

@bhuvanpavan的工作版

working version of @bhuvanpavan

import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.print.PageFormat;
import java.awt.print.Paper;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.awt.print.PrinterJob;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Enumeration;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;
import javax.print.attribute.standard.OrientationRequested;
import javax.swing.JTextArea;

public class NewClass {

    public void a() {
        PageFormat format = new PageFormat();
        Paper paper = new Paper();

        double paperWidth = 3;//3.25
        double paperHeight = 3.69;//11.69
        double leftMargin = 0.12;
        double rightMargin = 0.10;
        double topMargin = 0;
        double bottomMargin = 0.01;

        paper.setSize(paperWidth * 200, paperHeight * 200);
        paper.setImageableArea(leftMargin * 200, topMargin * 200,
                (paperWidth - leftMargin - rightMargin) * 200,
                (paperHeight - topMargin - bottomMargin) * 200);

        format.setPaper(paper);

        PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
        aset.add(OrientationRequested.PORTRAIT);
//testing 

        PrinterJob printerJob = PrinterJob.getPrinterJob();
        Printable printable = new ReceiptPrint();

        format = printerJob.validatePage(format);
        boolean don = printerJob.printDialog();
        printerJob.setPrintable(printable, format);
        try {
            printerJob.print(aset);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

class ReceiptPrint implements Printable {

    SimpleDateFormat df = new SimpleDateFormat();
    String receiptDetailLine;
    public static final String pspace = "               ";//15-spaces

    public int print(Graphics graphics, PageFormat pageFormat, int pageIndex)
            throws PrinterException {

        df.applyPattern("dd/MM/yyyy HH:mm:ss");
        String strText = null;
        final String LF = "\n";// text string to output
        int lineStart;           // start index of line in textarea
        int lineEnd;             // end index of line in textarea
        int lineNumber;
        int lineCount;
        final String SPACE = "          ";//10 spaces
        final String SPACES = "         ";//9
        final String uline = "________________________________________";
        final String dline = "----------------------------------------";
        String greetings = "THANKS FOR YOUR VISIT";
        receiptDetailLine = "asdasdasda";

        Graphics2D g2d = (Graphics2D) graphics;
        Font font = new Font("MONOSPACED", Font.BOLD, 9);

        if (pageIndex < 0 || pageIndex >= 1) {
            return Printable.NO_SUCH_PAGE;
        }
        JTextArea textarea = new JTextArea(10, 40);

 //testing
        textarea.append(SPACES + "sadasdsad" + "\n");

        textarea.append(" " + SPACES + "sadasdsad" + "\n");

        textarea.append(SPACES + "sadasdsad" + "\n");

        textarea.append("" + SPACES + "sadasdsad" + "\n");

        textarea.append(SPACES + "sadasdsad" + "\n");

        textarea.append(uline + "\n");
        textarea.append("Order Ref:" + "   " + receiptDetailLine + "\n");
        textarea.append(dline + "\n");
        textarea.append(" Qty     Description" + SPACES + "  Price" + LF);
        textarea.append(dline + "\n");

        System.out.println(2);

        String printedLine = "       Service Charge Complimentary";
        textarea.append(printedLine + LF);

        textarea.append(LF + SPACES + "   Your Reciept\n" + SPACE + greetings + LF);
        textarea.append(df.format(new Date()) + LF);
        textarea.setEditable(false);

        g2d.translate(pageFormat.getImageableX(), pageFormat.getImageableY());

        g2d.setFont(font);
        lineNumber = 0;
        lineCount = textarea.getLineCount();
        strText = textarea.getText();
        /*MediaTracker mt = new MediaTracker(textarea);
         URL imageURL = null;
         try {

         imageURL = new URL(mainDirectory+"quindell.png");
         } catch (MalformedURLException me) {
         me.printStackTrace();
         }

         //--- Load the image and wait for it to load
         Image image = Toolkit.getDefaultToolkit().getImage(imageURL);
         mt.addImage(image, 0);
         */

        while (lineCount != 0) {
            try {

                lineStart = textarea.getLineStartOffset(lineNumber);
                lineEnd = textarea.getLineEndOffset(lineNumber);
                strText = textarea.getText(lineStart, lineEnd - lineStart);
            } catch (Exception exception) {
                System.out.println("Printing error:" + exception);                  // have to catch BadLocationException
            }

            g2d.drawString(strText, 1, (lineNumber + 1) * 18);
            //spacing    between lines
            lineNumber = lineNumber + 1;
            lineCount--;
        }
        return Printable.PAGE_EXISTS;
    }
}

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