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Java Print Service API User Guide

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APPENDIX F

Example: PrintGIF.java

/*
*
* Use is subject to license terms.
*
*/

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

/*
*  Use the Java 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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