我怎样打印一张定制的纸张尺寸(支票8“x 4”)?

I am trying to print a custom paper size from a Java applet. I have set the paper size but it is being ignored.

我正在尝试从Java applet中打印定制的纸张大小。我设置了纸张大小，但它被忽略了。

I have also tried using the book method as I have seen something about this helping to get it working but when I use that it just prints a blank page and still seems to be about A4 (I'm looking to print cheques which are obviously much smaller (8" x 4")).

这本书我也尝试使用方法我看过一些关于这个帮助得到它的工作,但当我使用它只是打印一个空白页,似乎仍对A4(我想打印支票明显小得多(8 * 4))。

I am trying to print HTML from a JEditorPane if that makes any difference.

我正在尝试从一个JEditorPane打印HTML，如果这有什么区别的话。

If you have any ideas I would be very grateful, I'm tearing my hair out with this one.

如果你有什么想法，我会非常感激的，我要把我的头发弄出来。

I should also add that I am very much a beginner when it comes to Java.

我还应该补充一点，当涉及到Java时，我是一个新手。

Here is what I have so far:

以下是我目前所拥有的:

Updated: I have now got the page size right but can't seem to get the HTML page I'm loading to fit or line up with the page size.

更新:现在我已经获得了页面大小的权利，但是似乎无法获得我正在加载的HTML页面，或者与页面大小一致。

Update: Now I just can't get the applet to run in the browser. It works from eclipse just not the browser. I will also need to pass the URL from a parameter.

更新:现在我无法让applet在浏览器中运行。它的工作原理是eclipse，而不是浏览器。我还需要从一个参数传递URL。

Here is the HTML applet tag I'm using and updated Java code:

下面是我正在使用和更新的Java代码的HTML applet标记:

<!DOCTYPE html>
<html>
<head><title>Printing Cheque</title></head>
<body>
<applet width=100 height=100 code="HTMLPrinter"
        archive="cheque_print.jar">
</applet>

</body>
</html>


package com.yunatech.pns.chequeprint;

import java.applet.Applet;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.print.Book;
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 javax.swing.JEditorPane;

public class HTMLPrinter extends Applet {

    /**
     * 
     */
    private static final long serialVersionUID = 8065834484717197790L;
    private static JEditorPane editor;

    public HTMLPrinter() {


        try {

            editor = new JEditorPane();
            editor.setPage("http://localhost/print_test/test.html");

            PrinterJob pj = PrinterJob.getPrinterJob();
            if (pj.printDialog()) {
                PageFormat pf = pj.defaultPage();
                Paper paper = pf.getPaper();
                double width = 8d * 72d;
                double height = 4d * 72d;
                double margin = 1d * 72d;
                paper.setSize(width, height);
                paper.setImageableArea(
                        margin,
                        0,
                        width - (margin * 2),
                        height);
                System.out.println("Before- " + dump(paper));
                pf.setOrientation(PageFormat.PORTRAIT);
                pf.setPaper(paper);
                System.out.println("After- " + dump(paper));
                System.out.println("After- " + dump(pf));
                dump(pf);
                PageFormat validatePage = pj.validatePage(pf);
                System.out.println("Valid- " + dump(validatePage));

                Book pBook = new Book();
                pBook.append(new Page(), pf);
                pj.setPageable(pBook);

                try {
                    pj.print();
                } catch (PrinterException ex) {
                    ex.printStackTrace();
                }
            }

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

    protected static String dump(Paper paper) {
        StringBuilder sb = new StringBuilder(64);
        sb.append(paper.getWidth()).append("x").append(paper.getHeight())
                .append("/").append(paper.getImageableX()).append("x").
                append(paper.getImageableY()).append(" - ").append(paper
                .getImageableWidth()).append("x").append(paper.getImageableHeight());
        return sb.toString();
    }

    protected static String dump(PageFormat pf) {
        Paper paper = pf.getPaper();
        return dump(paper);
    }

    public static class Page implements Printable {

        public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) {
            if (pageIndex >= 1) return Printable.NO_SUCH_PAGE;

            Graphics2D g2d = (Graphics2D)graphics;
            g2d.translate((int)pageFormat.getImageableX(), (int)pageFormat.getImageableY());

            editor.setSize((int)pageFormat.getImageableWidth(), (int)pageFormat.getImageableHeight());
            editor.print(g2d);

            return Printable.PAGE_EXISTS;
        }
    }
}

Thanks in advance for any help you can offer.

感谢你能提供的任何帮助。

1 个解决方案

#1

Printing is designed to work in pixels per inch. The base print API uses a DPI of 72.

印刷术的设计单位是每英寸像素。基本打印API使用的是72的DPI。

You need to convert your measurements accordingly...

您需要相应地转换您的测量值……

double paperWidth = 8 * 72d;
double paperHeight = 4 * 72d;
double margin = 1 * 72d;

UPDATED with example

更新的例子

g2d.setClip(0, 0, (int)pageFormat.getImageableWidth(), (int)pageFormat.getImageableHeight()); is ill adviced, dangerous and generally, not required, besides which, you've used the wrong width and height values. The imageable parameters take into account the margins, but you've not translated the graphics, which will more then likely cut of the bottom, left portion of the area you do have to print to...

2级残疾。setClip(0,0,(int)pageFormat.getImageableWidth(),(int)pageFormat.getImageableHeight());我的建议是错误的，危险的，一般的，不需要的，除此之外，你使用了错误的宽度和高度值。图像参数考虑了边缘，但你没有翻译图形，这将更有可能减少底部，左边的部分你必须打印到…