Printing di Java

Postingan ini membahas salah satu cara bagaimana melakukan printing di Java. Ok, seperti biasa, kita buat contoh spesifiknya.

Setelah melakukan sorting entry alamat, kita ingin melakukan hal yang lebih keren lagi. What’s that? Mencetak entry alamat. Jadi, dari kumpulan entry alamat yang kita punyai, kita ingin mencetaknya ke dalam label alamat. Cool?! Really Cool?! he..he..he

Sekarang, bagaimana kita melakukannya? Darimana kita memulainya? Oh, tentu saja dari javadocs. Kita cari-cari java printing. Akhirnya kita menemukannya. Tapi… duh, kita baca jadi pusing. Akhirnya kita memutuskan mencari info lewat mesin pencarian kesayangan kita, Google. Kita ketikkan keyword java printing. Akhirnya kita terdampar di site ini:
http://java.sun.com/docs/books/tutorial/2d/printing/index.html

Halah, ternyata di situs java-nya sendiri terdapat tutorial bagaimana menggunakan java printing. Di sana terdapat beberapa contoh yang bisa kita pakai untuk keperluan kita. Tapi ada satu contoh yang tampaknya cocok dengan masalah kita, yaitu PaginationExample.java. Di contoh tersebut, didemonstrasikan bagaimana mencetak array dari Strings. Wah, ini bisa dipakai. Tapi kita perlu memodifikasinya. Alih-alih mem-feed-kan array dari string “This is line …”, kita feed-kan dengan string dari kita, yaitu info entry alamat. Done…

Sekarang, kodenya bagaimana?
Kita modifikasi kelas entry alamat kita dengan mengubah reprentasi string dari entry alamat. Ini untuk keperluan tampilan di label. Ok, that’s easy…

import java.util.*;

public class EntryAlamat implements Comparable<EntryAlamat> {

	private String nama;
	private String alamat;

	public EntryAlamat(String nama, String alamat) {
		this.nama = nama;
		this.alamat = alamat;
	}

	public String getNama() {
		return nama;
	}

	public String getAlamat() {
		return alamat;
	}

	public int compareTo(EntryAlamat lain) {
		return nama.compareTo(lain.getNama());
	}

	public String toString() {
		StringBuffer buffer = new StringBuffer();
		buffer.append("=================================\n");
		buffer.append(nama);
		buffer.append('\n');
		buffer.append(alamat);
		buffer.append("\n=================================\n");
		return buffer.toString();
	}
}

Selanjutnya, kita modifikasi PaginationExample.java menjadi seperti listing kode di bawah. Kita ubah namanya menjadi PrintingAlamat.java. Kemudian, kita isi initTextLines dengan array string milik kita. Ok, that’s also easy…

/*
 * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Sun Microsystems nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */ 

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.print.*;
import java.util.*;

public class PrintingAlamat implements Printable, ActionListener {

    int[] pageBreaks;  // array of page break line positions.

    String[] textLines;  

    private void initTextLines() {

    	ArrayList<EntryAlamat> BukuAlamat = new ArrayList<EntryAlamat>();

		// Sampel
		BukuAlamat.add(new EntryAlamat("Yayak", "Gedongkuning no. 419 Yogyakarta"));
		BukuAlamat.add(new EntryAlamat("Paijo", "Babadan RT. 1 RW. 1 Banguntapan Bantul"));
		BukuAlamat.add(new EntryAlamat("Andi", "Janti no. 1 Yogyakarta"));
		BukuAlamat.add(new EntryAlamat("Budi", "Tegalrejo RT. 16 RW. 16 Banguntapan Bantul"));
    	StringBuffer buffer = new StringBuffer();
    	for (EntryAlamat entry: BukuAlamat) {
    	        buffer.append(entry);
    	        buffer.append('\n');
    	}
		textLines = buffer.toString().split("\n");
    }

    /* Synthesise some sample lines of text */
    //private void initTextLines() {
    //    if (textLines == null) {
    //        int numLines=200;
    //        textLines = new String[numLines];
    //        for (int i=0;i<numLines;i++) {
    //            textLines[i]= "This is line number " + i;
    //        }
    //    }
    //}

    public int print(Graphics g, PageFormat pf, int pageIndex)
             throws PrinterException {

        Font font = new Font("Serif", Font.PLAIN, 10);
        FontMetrics metrics = g.getFontMetrics(font);
        int lineHeight = metrics.getHeight();

        if (pageBreaks == null) {
            initTextLines();
            int linesPerPage = (int)(pf.getImageableHeight()/lineHeight);
            int numBreaks = (textLines.length-1)/linesPerPage;
            pageBreaks = new int[numBreaks];
            for (int b=0; b<numBreaks; b++) {
                pageBreaks[b] = (b+1)*linesPerPage;
            }
        }

        if (pageIndex > pageBreaks.length) {
            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
         * Since we are drawing text we
         */
        Graphics2D g2d = (Graphics2D)g;
        g2d.translate(pf.getImageableX(), pf.getImageableY());

        /* Draw each line that is on this page.
         * Increment 'y' position by lineHeight for each line.
         */
        int y = 0;
        int start = (pageIndex == 0) ? 0 : pageBreaks[pageIndex-1];
        int end   = (pageIndex == pageBreaks.length)
                         ? textLines.length : pageBreaks[pageIndex];
        for (int line=start; line<end; line++) {
            y += lineHeight;
            g.drawString(textLines[line], 0, y);
        }

        /* tell the caller that this page is part of the printed document */
        return PAGE_EXISTS;
    }

    public void actionPerformed(ActionEvent e) {
         PrinterJob job = PrinterJob.getPrinterJob();
         job.setPrintable(this);
         boolean ok = job.printDialog();
         if (ok) {
             try {
                  job.print();
             } catch (PrinterException ex) {
              /* The job did not successfully complete */
             }
         }
    }

    public static void main(String args[]) {

        try {
            String cn = UIManager.getSystemLookAndFeelClassName();
            UIManager.setLookAndFeel(cn); // Use the native L&F
        } catch (Exception cnf) {
        }
        JFrame f = new JFrame("Printing Entry Alamat");
        f.addWindowListener(new WindowAdapter() {
           public void windowClosing(WindowEvent e) {System.exit(0);}
        });
        JButton printButton = new JButton("Print Pages");
        printButton.addActionListener(new PrintingAlamat());
        f.add("Center", printButton);
        f.pack();
        f.setVisible(true);
    }
}

Ok, now hope and pray.

Yess, akhirnya tampilan printer dialog muncul. Ini pertanda bagus.

Dan, hasilnya seperti ini.

How’s that? Cool?