advprint.html

jdbc书

<P>

The printed page window then slides along the component to print
the second page, page index one.
<P>
<IMG SRC="./Art/page2.gif">
<P>

This process continues until the last page from the total number
of pages is reached:

<P>
<IMG SRC="./Art/page3.gif">
<P>

<A NAME="pe"></A>
<H3>Printing A <CODE>JTable</CODE> Component</H3>

The <A HREF="./Code/Report.java">Report.java</A> class
uses many of the advanced techniques covered
in this section to print out the data and header 
of a <CODE>JTable</CODE> component that can span many pages.
The printed output also includes a footer at the bottom
with the page number. 

<P>
<IMG SRC="./Art/report.gif">

<P>
This diagram shows how the report looks when it prints:
<P>
<IMG SRC="./Art/reportprint.gif">

</FONT>

<PRE>
<FONT SIZE="-1">
import javax.swing.*;
import javax.swing.table.*;
import java.awt.print.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.Dimension;

public class Report implements Printable{
  JFrame frame;
  JTable tableView;

  public Report() {
    frame = new JFrame("Sales Report");
    frame.addWindowListener(new WindowAdapter() {
    public void windowClosing(WindowEvent e) {
      System.exit(0);}});

    final String[] headers = {"Description", "open price", 
	"latest price", "End Date", "Quantity"};
    final Object[][] data = {
        {"Box of Biros", "1.00", "4.99", new Date(), 
          new Integer(2)},
        {"Blue Biro", "0.10", "0.14", new Date(), 
          new Integer(1)},
        {"legal pad", "1.00", "2.49", new Date(), 
          new Integer(1)},
        {"tape", "1.00", "1.49", new Date(), 
          new Integer(1)},
        {"stapler", "4.00", "4.49", new Date(), 
          new Integer(1)},
        {"legal pad", "1.00", "2.29", new Date(), 
          new Integer(5)}
    };

    TableModel dataModel = new AbstractTableModel() {
        public int getColumnCount() { 
          return headers.length; }
        public int getRowCount() { return data.length;}
        public Object getValueAt(int row, int col) {
        	return data[row][col];}
        public String getColumnName(int column) {
         	return headers[column];}
        public Class getColumnClass(int col) {
                return getValueAt(0,col).getClass();}
        public boolean isCellEditable(int row, int col) {
                return (col==1);}
        public void setValueAt(Object aValue, int row, 
                      int column) {
                data[row][column] = aValue;
       }
     };

     tableView = new JTable(dataModel);
     JScrollPane scrollpane = new JScrollPane(tableView);

     scrollpane.setPreferredSize(new Dimension(500, 80));
     frame.getContentPane().setLayout(
               new BorderLayout());
     frame.getContentPane().add(
               BorderLayout.CENTER,scrollpane);
     frame.pack();
     JButton printButton= new JButton();

     printButton.setText("print me!");

     frame.getContentPane().add(
               BorderLayout.SOUTH,printButton);

     // for faster printing turn double buffering off

     RepaintManager.currentManager(
     	frame).setDoubleBufferingEnabled(false);

     printButton.addActionListener( new ActionListener(){
        public void actionPerformed(ActionEvent evt) {
          PrinterJob pj=PrinterJob.getPrinterJob();
          pj.setPrintable(Report.this);
          pj.printDialog();
          try{ 
            pj.print();
          }catch (Exception PrintException) {}
          }
        });

        frame.setVisible(true);
     }

     public int print(Graphics g, PageFormat pageFormat, 
        int pageIndex) throws PrinterException {
     	Graphics2D  g2 = (Graphics2D) g;
     	g2.setColor(Color.black);
     	int fontHeight=g2.getFontMetrics().getHeight();
     	int fontDesent=g2.getFontMetrics().getDescent();

     	//leave room for page number
     	double pageHeight = 
     	  pageFormat.getImageableHeight()-fontHeight;
     	double pageWidth = 
     	  pageFormat.getImageableWidth();
     	double tableWidth = (double) 
          tableView.getColumnModel(
          ).getTotalColumnWidth();
     	double scale = 1; 
     	if (tableWidth &gt;= pageWidth) {
		scale =  pageWidth / tableWidth;
	}

     	double headerHeightOnPage=
                 tableView.getTableHeader(
                 ).getHeight()*scale;
     	double tableWidthOnPage=tableWidth*scale;

     	double oneRowHeight=(tableView.getRowHeight()+
                      tableView.getRowMargin())*scale;
     	int numRowsOnAPage=
              (int)((pageHeight-headerHeightOnPage)/
                                  oneRowHeight);
     	double pageHeightForTable=oneRowHeight*
     	                            numRowsOnAPage;
     	int totalNumPages= 
     	      (int)Math.ceil((
                (double)tableView.getRowCount())/
                                    numRowsOnAPage);
     	if(pageIndex&gt;=totalNumPages) {
                      return NO_SUCH_PAGE;
     	}

     	g2.translate(pageFormat.getImageableX(), 
                       pageFormat.getImageableY());
//bottom center
     	g2.drawString("Page: "+(pageIndex+1),
     	    (int)pageWidth/2-35, (int)(pageHeight
     	    +fontHeight-fontDesent));

     	g2.translate(0f,headerHeightOnPage);
     	g2.translate(0f,-pageIndex*pageHeightForTable);

     	//If this piece of the table is smaller 
     	//than the size available,
     	//clip to the appropriate bounds.
     	if (pageIndex + 1 == totalNumPages) {
           int lastRowPrinted = 
                 numRowsOnAPage * pageIndex;
           int numRowsLeft = 
                 tableView.getRowCount() 
                 - lastRowPrinted;
           g2.setClip(0, 
             (int)(pageHeightForTable * pageIndex),
             (int) Math.ceil(tableWidthOnPage),
             (int) Math.ceil(oneRowHeight * 
                               numRowsLeft));
     	}
     	//else clip to the entire area available.
     	else{    
             g2.setClip(0, 
             (int)(pageHeightForTable*pageIndex), 
             (int) Math.ceil(tableWidthOnPage),
             (int) Math.ceil(pageHeightForTable));        
     	}

     	g2.scale(scale,scale);
     	tableView.paint(g2);
     	g2.scale(1/scale,1/scale);
     	g2.translate(0f,pageIndex*pageHeightForTable);
     	g2.translate(0f, -headerHeightOnPage);
     	g2.setClip(0, 0,
     	  (int) Math.ceil(tableWidthOnPage), 
          (int)Math.ceil(headerHeightOnPage));
     	g2.scale(scale,scale);
     	tableView.getTableHeader().paint(g2);
     	//paint header at top

     	return Printable.PAGE_EXISTS;
   }

   public static void main(String[] args) {
	new Report();
   }
}
</FONT>
</PRE>

<FONT FACE="Verdana, Arial, Helvetica, sans-serif">

<A NAME="sales"></A>
<H3>Print a Sales Report</H3>

The <A HREF="./Code/SalesReport.java">SalesReport.java</A>
<CODE>Applet</CODE> class
prints a sales report with the rows split over multiple pages
with numbers at the bottom of each page.
Here is how the application looks when launched:

<P>
<IMG SRC="./Art/salesrep.gif">
<P>

You need this policy file to launch the applet:

</FONT>

<PRE>
grant {
  permission java.lang.RuntimePermission 
                         "queuePrintJob";
};
</PRE>

<FONT FACE="Verdana, Arial, Helvetica, sans-serif">

To launch the applet assuming a policy file named
<CODE>printpol</CODE> and an HTML file named
<CODE>SalesReport.html</CODE>, you would type:

</FONT>

<PRE>
  appletviewer -J-Djava.security.policy=
                 printpol SalesReport.html
</PRE>

<FONT FACE="Verdana, Arial, Helvetica, sans-serif">

This diagram shows how the report prints:

<P>
<IMG SRC="./Art/salesprint.gif">

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