我必须使用Java通过热敏打印机打印收据。我做了一切。 我的程序从数据库中获取数据，并使用特殊字符，制表符和\ n转换为一个字符串。然后将字符串传递给另一个将其转换为图形的方法。
问题是当我点击打印按钮时，会出现白纸。我注意到我的String的前4-5个字符被打印在纸张末端右角的纸币的最后一行。我的打印机是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();
}
打印账单的方法是：
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());
}
}
问题是什么？如何解决？我认为我没有在drawString（）方法中设置正确的参数。
还是别的什么？任何帮助我都会感激。！
答案 0 :(得分：10)
我发现了这个：
Java Pos Thermal Printer Example
它对我有用。不需要外部库。
new FileWriter
主要课程：
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;
}
}
答案 1 :(得分：8)
嗯，我想你应该使用你的打印机的ESC / POS命令，阅读Epson TM - T81的打印机技术手册。我和TM-U220D有类似的问题，我为它写了一个类。这可能没有帮助，因为打印机是不同的，无论如何我附加它作为参考：
//------------------------
//-- 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;
}
现在准备账单：）
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());