Java Print Service API User Guide: - Example: PrintGIF.java - JDK 5 Documentation v1.4.1, Java 2 SDK 英文文档

Java^TM Print Service API User Guide
APPENDIX F

Example: PrintGIF.java

/*
* Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the proprietary information of Sun Microsystems, Inc.
* Use is subject to license terms.
*
*/

import java.io.*;
import javax.print.*;
import javax.print.attribute.*;
import javax.print.attribute.standard.*;

/*
*  Use the Java(TM) Print Service API to locate a print service which
*  can print a GIF-encoded image. A GIF image is printed according to
*  a job template specified as a set of printing attributes.
*/
public class PrintGIF {

	public static void main(String args[]) {

		/* Use the pre-defined flavor for a GIF from an InputStream */
		DocFlavor flavor = DocFlavor.INPUT_STREAM.GIF;

		/* Create a set which specifies how the job is to be printed */
		PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
		aset.add(MediaSizeName.NA_LETTER);
		aset.add(new Copies(1));

		/* Locate print services which can print a GIF in the manner specified */
		PrintService[] pservices =
			PrintServiceLookup.lookupPrintServices(flavor, aset);

		if (pservices.length > 0) {
			/* Create a Print Job */
			DocPrintJob printJob = pservices[0].createPrintJob();

			/* Create a Doc implementation to pass the print data */
			Doc doc = new InputStreamDoc("java2dlogo.gif", flavor);

			/* Print the doc as specified */
			try {
				printJob.print(doc, aset);
			} catch (PrintException e) { 
				System.err.println(e);
			}
		} else {
			System.err.println("No suitable printers");
		}
	}
}

class InputStreamDoc implements Doc {
	private String filename;
	private DocFlavor docFlavor;
	private InputStream stream;

	public InputStreamDoc(String name, DocFlavor flavor) {
		filename = name;
		docFlavor = flavor;
	}
   
	public DocFlavor getDocFlavor() { 
		return docFlavor;
	}

	/* No attributes attached to this Doc - mainly useful for MultiDoc */
	public DocAttributeSet getAttributes() {
		return null;
	}

	/* Since the data is to be supplied as an InputStream delegate to
	* getStreamForBytes().
	*/
	public Object getPrintData() throws IOException {
		return getStreamForBytes();
	}

	/* Not possible to return a GIF as text */
	public Reader getReaderForText()
		throws UnsupportedEncodingException, IOException {
   	return null;
	}

	/* Return the print data as an InputStream.
	* Always return the same instance.
	*/
	public InputStream getStreamForBytes() throws IOException {
		synchronized(this) {
			if (stream == null) {
				stream = new FileInputStream(filename);
			}
			return stream;
		} 
	}
}
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