I have a system where the user can register students, subjects, and the student grade in each subject, together with the topic and the date. You can search a particular student grades in a particular subject by entering the code of the student, and by selecting the subject from a combobox. If you search it, those things are displayed in the jTable1.
Then, I have a PRINT button. When the user clicks the Print button, the content that is being displayed in the jTable1, goes to a jTable2, the difference between those 2 tables is that the jTable1 displays the name of the student, and the name of the subject, but the jTable2 doesn't. Here is a pic for better understanding:
http://i.stack.imgur.com/37SNh.png
So, when the user clicked the button to Print the jTable2, I was using this code right here:
MessageFormat header = new MessageFormat("Ficha Pedagógica - "+jComboBox1.getSelectedItem());
MessageFormat footer = new MessageFormat("Página {0,number,integer}");
try{
jTable2.print(JTable.PrintMode.NORMAL, header, null);
}
catch(java.awt.print.PrinterException e){
System.out.println("error");
}
The fact is, that I wanted 2 headlines to be printed, but such thing couldn't be achieved using the built-in print function. So, here in Stack Overflow, I found this topic:
How to print multiple header lines with MessageFormat using a JTable
After I found this, I tried using the code given there. Since I'm a beginner, even with all the comments in the code, I couldn't fully understand it. So, I tried to implement it, but now, when I click the "Print" button, nothing happens. This is my code of the Print button:
private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
try{
Class.forName(driver);
con = DriverManager.getConnection(str_conn,usuario,senha);
stmt = con.createStatement();
sql = "select topico, nota, datanota from notas where notas.cod_aluno ="+jTextField1.getText()+" and notas.cod_curso ="+jTextField2.getText()+" order by notas.datanota";
rs = stmt.executeQuery(sql);
if(rs == null){
return;
}
ResultSetMetaData rsmd;
rsmd = rs.getMetaData();
Vector vetColuna = new Vector();
for(int i = 0;i<rsmd.getColumnCount();i++){
vetColuna.add(rsmd.getColumnLabel(i+1));
}
Vector vetLinhas = new Vector();
while(rs.next()){
Vector vetLinha = new Vector();
for(int i = 0;i<rsmd.getColumnCount();i++){
vetLinha.add(rs.getObject(i+1));
}
vetLinhas.add(vetLinha);
jTable2.setModel(new DefaultTableModel(vetLinhas,vetColuna));
}
}catch(ClassNotFoundException ex){
JOptionPane.showMessageDialog(null,"Erro
N?o foi possível carregar o driver.");
System.out.println("Nao foi possivel carregar o driver");
ex.printStackTrace();
}catch(SQLException ex){
JOptionPane.showMessageDialog(null,"Erro
Certifique-se de que todos os
campos estejam preenchidos corretamente.");
System.out.println("Problema com o SQL");
ex.printStackTrace();
}
/*MessageFormat header = new MessageFormat("Ficha Pedagógica - "+jComboBox1.getSelectedItem());
MessageFormat footer = new MessageFormat("Página {0,number,integer}");
try{
jTable2.print(JTable.PrintMode.NORMAL, header, null);
}
catch(java.awt.print.PrinterException e){
System.out.println("gsgd");
}*/
DefaultTableModel dtm = new DefaultTableModel(new String[] { "Column 1" }, 1);
JTable jTable2 = new JTable(dtm) {
@Override
public Printable getPrintable(PrintMode printMode, MessageFormat headerFormat, MessageFormat footerFormat) {
return new TablePrintable(this, printMode, headerFormat, footerFormat);
}
};
}
The code for the "TablePrintable" class is the following:
static class TablePrintable implements Printable {
private final JTable table;
private final JTableHeader header;
private final TableColumnModel colModel;
private final int totalColWidth;
private final JTable.PrintMode printMode;
private final MessageFormat headerFormat;
private final MessageFormat footerFormat;
private int last = -1;
private int row = 0;
private int col = 0;
private final Rectangle clip = new Rectangle(0, 0, 0, 0);
private final Rectangle hclip = new Rectangle(0, 0, 0, 0);
private final Rectangle tempRect = new Rectangle(0, 0, 0, 0);
private static final int H_F_SPACE = 8;
private static final float HEADER_FONT_SIZE = 18.0f;
private static final float FOOTER_FONT_SIZE = 12.0f;
private final Font headerFont;
private final Font footerFont;
public TablePrintable(JTable table, JTable.PrintMode printMode, MessageFormat headerFormat,
MessageFormat footerFormat) {
this.table = table;
header = table.getTableHeader();
colModel = table.getColumnModel();
totalColWidth = colModel.getTotalColumnWidth();
if (header != null) {
// the header clip height can be set once since it's unchanging
hclip.height = header.getHeight();
}
this.printMode = printMode;
this.headerFormat = headerFormat;
this.footerFormat = footerFormat;
// derive the header and footer font from the table's font
headerFont = table.getFont().deriveFont(Font.BOLD, HEADER_FONT_SIZE);
footerFont = table.getFont().deriveFont(Font.PLAIN, FOOTER_FONT_SIZE);
}
@Override
public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) throws PrinterException {
// for easy access to these values
final int imgWidth = (int) pageFormat.getImageableWidth();
final int imgHeight = (int) pageFormat.getImageableHeight();
if (imgWidth <= 0) {
throw new PrinterException("Width of printable area is too small.");
}
// to pass the page number when formatting the header and footer
// text
Object[] pageNumber = new Object[] { Integer.valueOf(pageIndex + 1) };
// fetch the formatted header text, if any
String headerText = null;
if (headerFormat != null) {
headerText = headerFormat.format(pageNumber);
}
// fetch the formatted footer text, if any
String footerText = null;
if (footerFormat != null) {
footerText = footerFormat.format(pageNumber);
}
// to store the bounds of the header and footer text
Rectangle2D hRect = null;
Rectangle2D fRect = null;
// the amount of vertical space needed for the header and footer
// text
int headerTextSpace = 0;
int footerTextSpace = 0;
// the amount of vertical space available for printing the table
int availableSpace = imgHeight;
// if there's header text, find out how much space is needed for it
// and subtract that from the available space
if (headerText != null) {
graphics.setFont(headerFont);
int nbLines = headerText.split("
").length;
hRect = graphics.getFontMetrics().getStringBounds(headerText, graphics);
hRect = new Rectangle2D.Double(hRect.getX(), Math.abs(hRect.getY()), hRect.getWidth(),
hRect.getHeight() * nbLines);
headerTextSpace = (int) Math.ceil(hRect.getHeight() * nbLines);
availableSpace -= headerTextSpace + H_F_SPACE;
}
// if there's footer text, find out how much space is needed for it
// and subtract that from the available space
if (footerText != null) {
graphics.setFont(footerFont);
fRect = graphics.getFontMetrics().getStringBounds(footerText, graphics);
footerTextSpace = (int) Math.ceil(fRect.getHeight());
availableSpace -= footerTextSpace + H_F_SPACE;
}
if (availableSpace <= 0) {
throw new PrinterException("Height of printable area is too small.");
}
// depending on the print mode, we may need a scale factor to
// fit the table's entire width on the page
double sf = 1.0D;
if (printMode == JTable.PrintMode.FIT_WIDTH && totalColWidth > imgWidth) {
// if not, we would have thrown an acception previously
assert imgWidth > 0;
// it must be, according to the if-condition, since imgWidth > 0
assert totalColWidth > 1;
sf = (double) imgWidth / (double) totalColWidth;
}
// dictated by the previous two assertions
assert sf > 0;
// This is in a loop for two reasons:
// First, it allows us to catch up in case we're called starting
// with a non-zero pageIndex. Second, we know that we can be called
// for the same page multiple times. The condition of this while
// loop acts as a check, ensuring that we don't attempt to do the
// calculations again when we are called subsequent times for the
// same page.
while (last < pageIndex) {
// if we are finished all columns in all rows
if (row >= table.getRowCount() && col == 0) {
return NO_SUCH_PAGE;
}
// rather than multiplying every row and column by the scale
// factor
// in findNextClip, just pass a width and height that have
// already
// been divided by it
int scaledWidth = (int) (imgWidth / sf);
int scaledHeight = (int) ((availableSpace - hclip.height) / sf);
// calculate the area of the table to be printed for this page
findNextClip(scaledWidth, scaledHeight);
last++;
}
// create a copy of the graphics so we don't affect the one given to
// us
Graphics2D g2d = (Graphics2D) graphics.create();
// translate into the co-ordinate system of the pageFormat
g2d.translate(pageFormat.getImageableX(), pageFormat.getImageableY());
// to save and store the transform
AffineTransform oldTrans;
// if there's footer text, print it at the bottom of the imageable
// area
if (footerText != null) {
oldTrans = g2d.getTransform();
g2d.translate(0, imgHeight - footerTextSpace);
String[] lines = footerText.split("
");
printText(g2d, lines, fRect, footerFont, imgWidth);
g2d.setTransform(oldTrans);
}
// if there's header text, print it at the top of the imageable area
// and then translate downwards
if (headerText != null) {
String[] lines = headerText.split("
");
printText(g2d, lines, hRect, headerFont, imgWidth);
g2d.translate(0, headerTextSpace + H_F_SPACE);
}
// constrain the table output to the available space
tempRect.x = 0;
tempRect.y = 0;
tempRect.width = imgWidth;
