在java中使用熱敏打印機打印收件人

Question

我必須使用Java通過熱敏打印機打印收據。我做了一切。 我的程序從數據庫獲取數據，並使用特殊字符，製表符和\ n轉換爲一個字符串。然後將該字符串傳遞給將其轉換爲圖形的另一種方法。

問題是，當我單擊打印按鈕時，出現白紙。我注意到，我的字符串的前4-5個字符被打印在紙張最後端的右角的賬單的最後一行。我的打印機是Epson TM -T81。

public void printThisBill() 
    { 

     DefaultTableModel mod = (DefaultTableModel) jTable1.getModel(); 
     DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy"); 
     DateFormat timeFormat = new SimpleDateFormat("HH:mm"); 
     //get current date time with Date() 
     Date date = new Date(); 
     Date time = new Date(); 
     String Date = dateFormat.format(date); 
     String Time = timeFormat.format(time); 
     String Header = 
      " ****Super Market****  \n" 
      + "Date: "+Date+"  Time: "+Time+"\n" 
      + "---------------------------------\n" 
      + "Name   Qty Rate  Amt\n" 
      + "---------------------------------\n"; 

     String amt =  
      "\n \n \nTotal Amount = "+ amt() +"\n" 
      + "Tax =" + tax() + "\n" 
      + "*********************************\n" 
      + "Thank you. \n"; 

     String bill = Header; 
     int i = 0; 
     do 
     { 

     String name =  ""+ mod.getValueAt(i, 2); 
     String qty =  ""+ mod.getValueAt(i, 3); 
     String rate =  ""+ mod.getValueAt(i, 4); 
     String amount = ""+ mod.getValueAt(i, 6); 

     if(name.length() > 12) 
     { 
      name = name.substring(0, 12)+" "; 
     } 
     else 
     { 
      for(int j= name.length()-12; j<= name.length(); j++); 
      { 
       name = name+" "; 
      } 
     } 


     if(qty.length()<=5) 
     { 
      for(int j= 0; j<= qty.length()-5; j++); 
      { 
       qty = qty+" "; 
      } 
     } 

     rate = rate; 
     String items = 
      name+"\t"+qty+"\t"+rate+"\t"+amount+"\n"; 

     bill = bill+ items;  
     i++; 

    } while(i <= mod.getRowCount()-1); 

    bill = bill+amt; 
    System.out.println(bill); 
    printCard(bill); 
    dispose(); 
} 

而且，打印賬單的方法是：

public static void printCard(final String bill) 
{ 
     Printable contentToPrint = new Printable(){ 
     @Override 
     public int print(Graphics graphics, PageFormat pageFormat, int page) throws PrinterException 
     { 
      if (page > 0) { 
       return NO_SUCH_PAGE; 
      } 
      pageFormat.setOrientation(PageFormat.LANDSCAPE); 
      Graphics2D g2d = (Graphics2D)graphics.create(); 

      g2d.setPaint(Color.black); 
      g2d.setFont(new Font("Arial", Font.BOLD, 10)); 
      g2d.translate(pageFormat.getImageableX(), pageFormat.getImageableX()); 



      g2d.drawString(bill, 0, 0); 

      return PAGE_EXISTS; 
     } 
     }; 

     PrinterJob job = PrinterJob.getPrinterJob(); 
     job.setPrintable(contentToPrint); 
     //You can show a print dialog before printing by job by wrapping the following blocks with a conditional statement if(job.printDialog()){...} 
     try 
     { 
      job.print(); 
     } catch (PrinterException e) 
     { 
      System.err.println(e.getMessage()); 
     } 

} 

這是什麼問題，我該怎麼解決呢？我認爲我沒有在drawString（）方法中設置正確的參數。

還是別的東西？任何幫助，我會感激。

Answer 1

嗯，我認爲你應該使用ESC/POS命令打印機，請閱讀打印機技術手冊Epson TM - T81。我有類似的問題與TM-U220D，我寫了一個類。這可能不是幫助的打印機不同，反正我安裝它作爲一個參考：

//------------------------ 
//-- PrinterOptions.java 
//------------------------ 

public class PrinterOptions { 
    String commandSet = ""; 

    public String initialize() { 
     final byte[] Init = {27, 64}; 
     commandSet += new String(Init); 
     return new String(Init); 
    } 

    public String chooseFont(int Options) { 
     String s = ""; 
     final byte[] ChooseFontA = {27, 77, 0}; 
     final byte[] ChooseFontB = {27, 77, 1}; 
     final byte[] ChooseFontC = {27, 77, 48}; 
     final byte[] ChooseFontD = {27, 77, 49}; 

     switch(Options) { 
      case 1: 
      s = new String(ChooseFontA); 
      break; 

      case 2: 
      s = new String(ChooseFontB); 
      break; 

      case 3: 
      s = new String(ChooseFontC); 
      break; 

      case 4: 
      s = new String(ChooseFontD); 
      break; 

      default: 
      s = new String(ChooseFontB); 
     } 
     commandSet += s; 
     return new String(s); 
    } 

    public String feedBack(byte lines) { 
     final byte[] Feed = {27,101,lines}; 
     String s = new String(Feed); 
     commandSet += s; 
     return s; 
    } 

    public String feed(byte lines) { 
     final byte[] Feed = {27,100,lines}; 
     String s = new String(Feed); 
     commandSet += s; 
     return s; 
    } 

    public String alignLeft() { 
     final byte[] AlignLeft = {27, 97,48}; 
     String s = new String(AlignLeft); 
     commandSet += s; 
     return s; 
    } 

    public String alignCenter() { 
     final byte[] AlignCenter = {27, 97,49}; 
     String s = new String(AlignCenter); 
     commandSet += s; 
     return s; 
    } 

    public String alignRight() { 
     final byte[] AlignRight = {27, 97,50}; 
     String s = new String(AlignRight); 
     commandSet += s; 
     return s; 
    } 

    public String newLine() { 
     final byte[] LF = {10}; 
     String s = new String(LF); 
     commandSet += s; 
     return s; 
    } 

    public String reverseColorMode(boolean enabled) { 
     final byte[] ReverseModeColorOn = {29, 66, 1}; 
     final byte[] ReverseModeColorOff = {29, 66, 0}; 

     String s = ""; 
     if(enabled) 
      s = new String(ReverseModeColorOn); 
     else 
      s = new String(ReverseModeColorOff); 

     commandSet += s; 
     return s; 
    } 

    public String doubleStrik(boolean enabled) { 
     final byte[] DoubleStrikeModeOn = {27, 71, 1}; 
     final byte[] DoubleStrikeModeOff = {27, 71, 0}; 

     String s=""; 
     if(enabled) 
      s = new String(DoubleStrikeModeOn); 
     else 
      s = new String(DoubleStrikeModeOff); 

     commandSet += s; 
     return s; 
    } 

    public String doubleHeight(boolean enabled) { 
     final byte[] DoubleHeight = {27, 33, 17}; 
     final byte[] UnDoubleHeight={27, 33, 0}; 

     String s = ""; 
     if(enabled) 
      s = new String(DoubleHeight); 
     else 
      s = new String(UnDoubleHeight); 

     commandSet += s; 
     return s; 
    } 

    public String emphasized(boolean enabled) { 
     final byte[] EmphasizedOff={27 ,0}; 
     final byte[] EmphasizedOn={27 ,1}; 

     String s=""; 
     if(enabled) 
      s = new String(EmphasizedOn); 
     else 
      s = new String(EmphasizedOff); 

     commandSet += s; 
     return s; 
    } 

    public String underLine(int Options) { 
     final byte[] UnderLine2Dot = {27, 45, 50}; 
     final byte[] UnderLine1Dot = {27, 45, 49}; 
     final byte[] NoUnderLine = {27, 45, 48}; 

     String s = ""; 
     switch(Options) { 
      case 0: 
      s = new String(NoUnderLine); 
      break; 

      case 1: 
      s = new String(UnderLine1Dot); 
      break; 

      default: 
      s = new String(UnderLine2Dot); 
     } 
     commandSet += s; 
     return new String(s); 
    } 

    public String color(int Options) { 
     final byte[] ColorRed = {27, 114, 49}; 
     final byte[] ColorBlack = {27, 114, 48}; 

     String s = ""; 
     switch(Options) { 
      case 0: 
      s = new String(ColorBlack); 
      break; 

      case 1: 
      s = new String(ColorRed); 
      break; 

      default: 
      s = new String(ColorBlack); 
     } 
     commandSet += s; 
     return s; 
    } 

    public String finit() { 
     final byte[] FeedAndCut = {29, 'V', 66, 0}; 

     String s = new String(FeedAndCut); 

     final byte[] DrawerKick={27,70,0,60,120}; 
     s += new String(DrawerKick); 

     commandSet+=s; 
     return s; 
    } 

    public String addLineSeperator() { 
     String lineSpace = "----------------------------------------"; 
     commandSet += lineSpace; 
     return lineSpace; 
    } 

    public void resetAll() { 
     commandSet = ""; 
    } 

    public void setText(String s) { 
     commandSet+=s; 
    } 

    public String finalCommandSet() { 
     return commandSet; 
    } 
} 

feedPrinter（） - 方法

private static boolean feedPrinter(byte[] b) { 
    try {  
     AttributeSet attrSet = new HashPrintServiceAttributeSet(new PrinterName("EPSON TM-U220 ReceiptE4", null)); //EPSON TM-U220 ReceiptE4 

     DocPrintJob job = PrintServiceLookup.lookupPrintServices(null, attrSet)[0].createPrintJob();  
     //PrintServiceLookup.lookupDefaultPrintService().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; 
} 

現在準備賬單:)

PrinterOptions p=new PrinterOptions(); 

p.resetAll(); 
p.initialize(); 
p.feedBack((byte)2); 
p.color(0); 
p.alignCenter(); 
p.setText("The Dum Dum Name"); 
p.newLine(); 
p.setText("Restaurant Dining"); 
p.newLine(); 
p.addLineSeperator(); 
p.setText("Bling Bling"); 
p.newLine(); 
p.addLineSeperator(); 
p.newLine(); 

p.alignLeft(); 
p.setText("POD No \t: 2001 \tTable \t: E511"); 
p.newLine();    

p.setText("Res Date \t: " + "01/01/1801 22:59"); 

p.newLine(); 
p.setText("Session \t: Evening Session"); 
p.newLine(); 
p.setText("Staff \t: Bum Dale"); 
p.newLine(); 
p.addLineSeperator(); 
p.newLine(); 
p.alignCenter(); 
p.setText(" - Some Items - "); 
p.newLine(); 
p.alignLeft(); 
p.addLineSeperator(); 

p.newLine(); 

p.setText("No \tItem\t\tUnit\tQty"); 
p.newLine(); 
p.addLineSeperator(); 
p.setText("1" + "\t" + "Aliens Everywhere" + "\t" + "Rats" + "\t" + "500"); 
p.setText("1" + "\t" + "Aliens Everywhere" + "\t" + "Rats" + "\t" + "500"); 
p.setText("1" + "\t" + "Aliens Everywhere" + "\t" + "Rats" + "\t" + "500"); 
p.setText("1" + "\t" + "Aliens Everywhere" + "\t" + "Rats" + "\t" + "500"); 
p.setText("1" + "\t" + "Aliens Everywhere" + "\t" + "Rats" + "\t" + "500"); 
p.setText("1" + "\t" + "Aliens Everywhere" + "\t" + "Rats" + "\t" + "500"); 

p.addLineSeperator(); 
p.feed((byte)3); 
p.finit(); 

feedPrinter(p.finalCommandSet().getBytes()); 

Answer 2

我發現這個：

Java Pos Thermal Printer Example

它爲我工作。不需要外部庫。

import java.awt.Font; 
import java.awt.Graphics; 
import java.awt.Graphics2D; 
import java.awt.print.PageFormat; 
import java.awt.print.Printable; 
import java.awt.print.PrinterException; 
import java.util.ArrayList; 
import java.util.List; 

import javax.print.Doc; 
import javax.print.DocFlavor; 
import javax.print.DocPrintJob; 
import javax.print.PrintService; 
import javax.print.PrintServiceLookup; 
import javax.print.SimpleDoc; 
import javax.print.attribute.HashPrintRequestAttributeSet; 
import javax.print.attribute.PrintRequestAttributeSet; 

public class PrinterService implements Printable { 

    public List<String> getPrinters(){ 

     DocFlavor flavor = DocFlavor.BYTE_ARRAY.AUTOSENSE; 
     PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet(); 

     PrintService printServices[] = PrintServiceLookup.lookupPrintServices(
       flavor, pras); 

     List<String> printerList = new ArrayList<String>(); 
     for(PrintService printerService: printServices){ 
      printerList.add(printerService.getName()); 
     } 

     return printerList; 
    } 

    @Override 
    public int print(Graphics g, PageFormat pf, int page) 
      throws PrinterException { 
     if (page > 0) { /* We have only one page, and 'page' is zero-based */ 
      return NO_SUCH_PAGE; 
     } 

     /* 
     * User (0,0) is typically outside the imageable area, so we must 
     * translate by the X and Y values in the PageFormat to avoid clipping 
     */ 
     Graphics2D g2d = (Graphics2D) g; 
     g2d.translate(pf.getImageableX(), pf.getImageableY()); 
     /* Now we perform our rendering */ 

     g.setFont(new Font("Roman", 0, 8)); 
     g.drawString("Hello world !", 0, 10); 

     return PAGE_EXISTS; 
    } 

    public void printString(String printerName, String text) { 

     // find the printService of name printerName 
     DocFlavor flavor = DocFlavor.BYTE_ARRAY.AUTOSENSE; 
     PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet(); 

     PrintService printService[] = PrintServiceLookup.lookupPrintServices(
       flavor, pras); 
     PrintService service = findPrintService(printerName, printService); 

     DocPrintJob job = service.createPrintJob(); 

     try { 

      byte[] bytes; 

      // important for umlaut chars 
      bytes = text.getBytes("CP437"); 

      Doc doc = new SimpleDoc(bytes, flavor, null); 


      job.print(doc, null); 

     } catch (Exception e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

    } 

    public void printBytes(String printerName, byte[] bytes) { 

     DocFlavor flavor = DocFlavor.BYTE_ARRAY.AUTOSENSE; 
     PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet(); 

     PrintService printService[] = PrintServiceLookup.lookupPrintServices(
       flavor, pras); 
     PrintService service = findPrintService(printerName, printService); 

     DocPrintJob job = service.createPrintJob(); 

     try { 

      Doc doc = new SimpleDoc(bytes, flavor, null); 

      job.print(doc, null); 

     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 

    private PrintService findPrintService(String printerName, 
      PrintService[] services) { 
     for (PrintService service : services) { 
      if (service.getName().equalsIgnoreCase(printerName)) { 
       return service; 
      } 
     } 

     return null; 
    } 
} 

和主類：

public class Main { 

    public static void main(String[] args) { 

     PrinterService printerService = new PrinterService(); 

     System.out.println(printerService.getPrinters()); 

     //print some stuff. Change the printer name to your thermal printer name. 
     printerService.printString("EPSON-TM-T20II", "\n\n testing testing 1 2 3eeeee \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n"); 

     // cut that paper! 
     byte[] cutP = new byte[] { 0x1d, 'V', 1 }; 

     printerService.printBytes("EPSON-TM-T20II", cutP); 

    } 

}