myprintableobject.java

java抓屏功能,实现打印屏幕的功能

package ext.print;

import java.awt.*;
import java.awt.print.*;

public class MyPrintableObject implements Printable
{
	public int iResMul = 1; // 1 = 72 dpi; 4 = 288 dpi

	public int print(Graphics g, PageFormat pf, int iPage)
			throws PrinterException
	{
		final int FONTSIZE = 12;
		final double PNT_MM = 25.4 / 72.;
		if (0 != iPage)
			return NO_SUCH_PAGE;
		try
		{
			int iPosX = 1;
			int iPosY = 1;
			int iAddY = FONTSIZE * 3 / 2 * iResMul;
			int iWdth = (int) Math.round(pf.getImageableWidth() * iResMul) - 3;
			int iHght = (int) Math.round(pf.getImageableHeight() * iResMul) - 3;
			int iCrcl = Math.min(iWdth, iHght) - 4 * iResMul;
			Graphics2D g2 = (Graphics2D) g;
			PrinterJob prjob = ((PrinterGraphics) g2).getPrinterJob();
			g2.translate(pf.getImageableX(), pf.getImageableY());
			g2.scale(1.0 / iResMul, 1.0 / iResMul);
			g2.setFont(new Font("SansSerif", Font.PLAIN, FONTSIZE * iResMul));
			g2.setColor(Color.black);
			g2.drawRect(iPosX, iPosY, iWdth, iHght);
			g2.drawLine(iPosX, iHght / 2 + iWdth / 50, iPosX + iWdth, iHght / 2
					- iWdth / 50);
			g2.drawLine(iPosX, iHght / 2 - iWdth / 50, iPosX + iWdth, iHght / 2
					+ iWdth / 50);
			g2.drawOval(iPosX + 2 * iResMul, iHght - iCrcl - 2 * iResMul,
					iCrcl, iCrcl);
			iPosX += iAddY;
			iPosY += iAddY / 2;
			g2.drawString("PrinterJob-UserName: " + prjob.getUserName(), iPosX,
					iPosY += iAddY);
			g2.drawString("Betriebssystem: " + System.getProperty("os.name")
					+ " " + System.getProperty("os.version"), iPosX,
					iPosY += iAddY);
			g2
					.drawString("Java-Version: JDK "
							+ System.getProperty("java.version"), iPosX,
							iPosY += iAddY);
			g2.drawString("Width/Height: " + dbldgt(pf.getWidth()) + " / "
					+ dbldgt(pf.getHeight()) + " points = "
					+ dbldgt(pf.getWidth() * PNT_MM) + " / "
					+ dbldgt(pf.getHeight() * PNT_MM) + " mm", iPosX,
					iPosY += iAddY);
			g2.drawString("Imageable Width/Height: "
					+ dbldgt(pf.getImageableWidth()) + " / "
					+ dbldgt(pf.getImageableHeight()) + " points = "
					+ dbldgt(pf.getImageableWidth() * PNT_MM) + " / "
					+ dbldgt(pf.getImageableHeight() * PNT_MM) + " mm", iPosX,
					iPosY += iAddY);
			g2.drawString("Imageable X/Y: " + dbldgt(pf.getImageableX())
					+ " / " + dbldgt(pf.getImageableY()) + " points = "
					+ dbldgt(pf.getImageableX() * PNT_MM) + " / "
					+ dbldgt(pf.getImageableY() * PNT_MM) + " mm", iPosX,
					iPosY += iAddY);
			g2.drawString("versuchte Druckaufl sung: " + 72 * iResMul + " dpi",
					iPosX, iPosY += iAddY);
		}
		catch (Exception ex)
		{
			throw new PrinterException(ex.getMessage());
		}
		return PAGE_EXISTS;
	}

	private static double dbldgt(double d)
	{
		return Math.round(d * 10.) / 10.; // show one digit after point
	}

	public static void main(String[] args)
	{
		PrinterJob pj = PrinterJob.getPrinterJob();
		pj.setPrintable(new MyPrintableObject());
		if (pj.printDialog())
		{
			try
			{
				pj.print();
			}
			catch (PrinterException e)
			{
				System.out.println(e);
			}
		}
	}
}