有谁知道如何在 Java 中打印 BufferedImage ?
打印就像在屏幕上绘图一样,所以最终你会得到一个 Graphics 对象,你只需将图像绘制到其中即可。
I'm trying to do that by extending BufferedImage to implement the Printable interface like so (a collage of code I found from around the web):
package components;
import java.awt.image.PixelGrabber;
import javax.swing.*;
import java.io.*;
import java.awt.*;
import java.applet.Applet;
import javax.imageio.*;
import java.awt.Image.*;
import java.awt.image.BufferedImage;
import java.awt.image.ImageObserver;
import java.net.*;
import java.lang.*;
import java.io.*;
import java.io.File;
import java.lang.Integer;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.RenderingHints;
import java.lang.String;
import java.io.File;
import java.util.Iterator;
import javax.imageio.*;
import javax.imageio.stream.*;
import java.lang.ClassLoader.*;
import java.lang.Class;
import java.io.*;
import javax.print.*;
import javax.print.attribute.*;
import javax.print.attribute.standard.*;
import javax.print.attribute.standard.MediaSize.*;
import javax.print.event.*;
import java.awt.MediaTracker;
import java.awt.Color;
import java.awt.*;
import java.awt.print.*;
import javax.print.attribute.*;
import javax.swing.UIManager;
import java.awt.image.ColorModel;
import java.awt.image.WritableRaster;
import java.util.Hashtable;
import java.awt.image.IndexColorModel;
import java.awt.print.Printable.*;
import java.awt.Rectangle;
import java.awt.Graphics2D;
public class printableBufferedImage extends BufferedImage implements Printable
{
public printableBufferedImage(ColorModel cm, WritableRaster raster, boolean isRasterPremultiplied, Hashtable properties)
{
super(cm, raster, isRasterPremultiplied, properties);
}
public printableBufferedImage(int width, int height, int imageType)
{
super(width, height, imageType);
}
public printableBufferedImage(int width, int height, int imageType, IndexColorModel cm)
{
super(width, height, imageType, cm);
}
public int print(Graphics g, PageFormat pf, int page) throws
PrinterException {
Graphics2D g2d = (Graphics2D) g;
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
*/
try
{
g2d.setClip(0,0,2100,3300);
g2d.drawImage(this, 225, 0,null);
g2d.drawImage(this,225, 1550,null);
}
catch(Exception exc)
{
}
/* tell the caller that this page is part of the printed document */
//return NO_SUCH_PAGE;
return PAGE_EXISTS;
}
public BufferedImage resizeOurImageFromImage(BufferedImage OurImage, int targetWidth, int targetHeight)
throws Exception
{
double tempWidth, tempHeight;
int w,h,type;
Boolean OurImageHasAlpha;
OurImageHasAlpha = OurImage.getColorModel().hasAlpha();
if(OurImageHasAlpha)
{
type = BufferedImage.TYPE_INT_ARGB;
}
else
{
type = BufferedImage.TYPE_INT_RGB;
}
w = OurImage.getWidth();
h = OurImage.getHeight();
if((targetWidth == 0) && (targetHeight != 0))
{
targetWidth = (targetHeight * w) / h;
}
else
{
if((targetHeight == 0) && (targetWidth != 0))
{
targetHeight = (targetWidth * h) / w;
}
}
if((targetHeight == 0) || (targetWidth == 0))
{
throw(new Exception("In the Resize Image module with one dimension still zero after trying proportion"));
}
do
{
if(w > targetWidth)
{
tempWidth = ((double) w)/1.2;
if (tempWidth < (double) targetWidth)
{
w = targetWidth;
}
else
{
w = (int) java.lang.Math.round(tempWidth + 0.49);
}
}
else
{
w = targetWidth;
}
if(h > targetHeight)
{
tempHeight = ((double) h)/1.2;
if (tempHeight < (double) targetHeight)
{
h = targetHeight;
}
else
{
h = (int) java.lang.Math.round(tempHeight + 0.49);
}
}
else
{
h = targetHeight;
}
BufferedImage tmp = new BufferedImage(w, h, type);
Graphics2D g2 = tmp.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
g2.drawImage(OurImage, 0, 0, w, h, null);
g2.dispose();
OurImage = tmp;
} while ((targetHeight != h) || (targetWidth != w));
return OurImage;
}
}
I'm not sure what you mean by print. Print on a printer? Print to standard out? Write to a file?
You can check out this tutorial from sun. If you're looking to write to a file. Open in your favorite image tool and print from there.
http://download.oracle.com/javase/tutorial/2d/images/saveimage.html
If you're building a graphical app and using something like AWT you can using the java printing API which would probably require some tap dancing.
在这里检查我解决的问题: Java PrinterJob,无论如何,高质量打印最终得到 72 DPI解决方案是将图像绘制到 JPanel 的paintComponent(Graphics g) 方法并将此面板传递给 Print 实用程序类,在该类中,您可以轻松地根据需要缩放图像/面板以保持图像的高质量,听起来是一样的,但结果不是,我阅读了有关在“屏幕图形上下文”之外使用图像的建议,但在尝试之前不知道该怎么做解决办法,试试
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