使用Java上的Printable打印多页 [英] Print more than one page with Printable on Java

问题描述

我需要在应用程序上打印多页，但是例如，当我尝试打印时，我只能打印一页，或者同一页打印5次.

I need to print more than one page on my application, but when I try to print it I get only one page printed, or the same page printed 5 times, for example.

我将代码放在下面:

MyPrintableTable mpt = new MyPrintableTable();
PrinterJob job = PrinterJob.getPrinterJob();
//PageFormat pf = job.defaultPage();
job.setPrintable(mpt);             
job.printDialog();             
try 
{
    job.print();
} 
catch (PrinterException e) 
{
    // TODO Auto-generated catch block
    e.printStackTrace();
}

"MyPrintableTable"类:

"MyPrintableTable" class:

class MyPrintableTable implements Printable 
{
    public int print(Graphics g, PageFormat pf, int pageIndex) 
    {
        if (pageIndex != 0)
           return NO_SUCH_PAGE;
        Graphics2D g2 = (Graphics2D) g;
        g2.setFont(new Font("Serif", Font.PLAIN, 16));
        g2.setPaint(Color.black);
        int x = 100;
        int y = 100;
        for(int i = 0; i < sTable.size(); i++)
        {
            g2.drawString(sTable.get(i).toString(), x, y);
            y += 20;                    
        }
        return PAGE_EXISTS;
    }
}

如果我更改"pageIndex！= 0"条件，则我将打印更多的页面，但所有页面均使用相同的文本.

If I change the "pageIndex !=0" condition, I have more pages printed, but all with the same text.

我要打印我的所有文本，该文本的长度为三页，但是我只能打印第一页，或者打印三倍于第一页.

I want to print all my text, that has a three page lenght, but I only can print the first one, o print three times the first one.

有人可以帮助我吗?

推荐答案

这里是一个测试程序，该程序演示了我之前在注释中建议的原理.它基于打印多页文档中的思想，以及问题中的代码.在实际程序中，我可能会计算 linesPerPage 而不是将其编译为数字.

Here is a test program that demonstrates the principles I previously suggested in comments. It is based on ideas from Printing a Multiple Page Document, as well as on the code in the question. In a real program I would probably calculate linesPerPage rather than compiling in a number.

public class Test {
  public static void main(String[] args) {
    MyPrintableTable mpt = new MyPrintableTable();
    PrinterJob job = PrinterJob.getPrinterJob();
    // PageFormat pf = job.defaultPage();
    job.setPrintable(mpt);
    job.printDialog();
    try {
      job.print();
    } catch (PrinterException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  }
}

class MyPrintableTable implements Printable {
  private int linesPerPage = 20;
  private List<String> sTable = new ArrayList<String>();
  {
    for (int i = 0; i < 100; i++) {
      sTable.add("Line" + i);
    }
  }

  public int print(Graphics g, PageFormat pf, int pageIndex) {
    if (pageIndex * linesPerPage >= sTable.size())
      return NO_SUCH_PAGE;
    Graphics2D g2 = (Graphics2D) g;
    g2.setFont(new Font("Serif", Font.PLAIN, 16));
    g2.setPaint(Color.black);
    int x = 100;
    int y = 100;
    for (int i = linesPerPage * pageIndex; i < sTable.size()
        && i < linesPerPage * (pageIndex + 1); i++) {
      g2.drawString(sTable.get(i).toString(), x, y);
      y += 20;
    }
    return PAGE_EXISTS;
  }
}

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