问题
I have group of tables with dynamic rows. There are some scenarios where a table is splitted between pages. In some scenarios, only the last row is split into next page. Suppose if a table has 10 rows, the rows 1 thru 9 are displayed in page 1 and row 10 is displayed in page 2.
I am looking for a solution to have a page break (document.newpage()) to happen to move the entire table to next page in this scenario. I tried below code and it was working for some scenarios but not for all. I would like to find out when a table last row is going to split so I can add page break to move the complete table to next page to avoid last row orphan.
public class SplitItextLastRow {
final static private String BODY_FONT = FontFactory.getFont("Arial").getFamilyname();
public static void main(String[] args) {
try {
Document document = new Document();
document.setPageSize(PageSize.LETTER);
document.setMargins(16, 14, 14, 14);
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("C:/SplitItext.pdf"));
document.open();
document.setPageSize(PageSize.LETTER);
document.setMargins(16, 14, 14, 14);
int[] maxCountRows = new int[] { 3, 9, 2, 3, 7, 9, 2, 4, 5, 4, 9, 7, 6, 5, 4, 6, 8, 3 };
for (int k = 1; k <= maxCountRows.length; k++) {
PdfPTable table = new PdfPTable(1);
table.setSpacingAfter(0);
table.setSpacingBefore(0);
table.setTotalWidth(document.right() - document.left());
table.setLockedWidth(true);
table.setHeaderRows(1);
table.setSkipFirstHeader(true);
addHeader(table, "Header Row continued " + k, BaseColor.LIGHT_GRAY);
addHeader(table, "Header Row normal " + k, BaseColor.LIGHT_GRAY);
for (int i = 1; i < maxCountRows[k - 1]; i++) {
StringBuilder sb = new StringBuilder();
for (int p = 0; p < maxCountRows[k - 1] * 6; p++) {
sb.append("Text Row ");
}
add(table, sb.toString() + i, BaseColor.WHITE);
}
float verticalPosition = writer.getVerticalPosition(true);
System.out.println("------Table " + k);
if ((verticalPosition - table.getTotalHeight()) <= document.bottom()) {
System.out.println("........................................Last Row splitted");
}
document.add(table);
}
document.close();
} catch (Exception de) {
de.printStackTrace();
}
}
private static void addHeader(PdfPTable table, String text, BaseColor color) {
PdfPCell pdfCellHeader = new PdfPCell();
pdfCellHeader.setBackgroundColor(color);
pdfCellHeader.addElement(new Paragraph(new Phrase(text, FontFactory.getFont(BODY_FONT, 8f, BaseColor.BLUE))));
table.addCell(pdfCellHeader);
}
private static void add(PdfPTable table, String text, BaseColor color) {
PdfPCell pdfCellHeader = new PdfPCell();
pdfCellHeader.setBackgroundColor(color);
pdfCellHeader.addElement(new Paragraph(new Phrase(text, FontFactory.getFont(BODY_FONT, 5f, BaseColor.GREEN))));
table.addCell(pdfCellHeader);
}
}
回答1:
Yeah, it works as following:
At the beginning of your loop for (int k = 1; ... you have to add:
PdfPTable outerTable = new PdfPTable(1);
outerTable.setSpacingAfter(0);
outerTable.setSpacingBefore(0);
outerTable.setTotalWidth(document.right() - document.left());
outerTable.setLockedWidth(true);
and at it's end, you replace the document.add(table); with:
outerTable.addCell(new PdfPCell(table));
document.add(outerTable);
And this is it... :-)
You should then remove your debug outputs and you can remove the "continued" header thing and its corresponding table.setSkipFirstHeader(true);. It's enough that you have table.setHeaderRows(1);.
To be a bit lazier, since your original table has only one column as well, you can create your outerTable with PdfPTable outerTable = new PdfPTable(table); after you initialized your table with its width and spacings. But you have to create it before you add your content to your table.
回答2:
I tried Johannes' solution, but it did not work, I don't know why. Anyways, I found an own solution. I tested it with some random scenarios and it worked. The solution I found is to put the code below before adding the table to the document with document.add(table).
int headerRowsCount = table.getHeaderRows();
float headerRowsHeight = 0f;
for (int j = 0; j < headerRowsCount; j++) {
headerRowsHeight += table.getRowHeight(j);
}
float totalTableHeight = table.getTotalHeight() - headerRowsHeight;
float lastRowHeight = table.getRowHeight(table.getRows().size() - 1);
float tableHeightExceptLastRow = totalTableHeight - lastRowHeight + document.bottom();
float tableGap = verticalPosition - tableHeightExceptLastRow;
boolean lastRowSplit = (tableGap > -35 && (tableGap < lastRowHeight) && tableHeightExceptLastRow > 0);
if (lastRowSplit) {
document.newPage();
}
回答3:
Here's the complete working example as explained here... I used iText 2.1.7.
import java.awt.Color;
import java.io.FileOutputStream;
import com.lowagie.text.Document;
import com.lowagie.text.FontFactory;
import com.lowagie.text.PageSize;
import com.lowagie.text.Paragraph;
import com.lowagie.text.Phrase;
import com.lowagie.text.pdf.PdfPCell;
import com.lowagie.text.pdf.PdfPTable;
import com.lowagie.text.pdf.PdfWriter;
public class SplitItextLastRow
{
final static private String BODY_FONT = FontFactory.getFont("Arial").getFamilyname();
public static void main(final String[] args)
{
try
{
Document document = new Document();
document.setPageSize(PageSize.LETTER);
document.setMargins(16, 14, 14, 14);
PdfWriter writer =
PdfWriter.getInstance(document, new FileOutputStream("SplitItext.pdf"));
document.open();
document.setPageSize(PageSize.LETTER);
document.setMargins(16, 14, 14, 14);
int[] maxCountRows = new int[]
{
3, 9, 2, 3, 7, 9, 2, 4, 5, 4, 9, 7, 6, 5, 4, 6, 8, 3
};
for (int k = 1; k <= maxCountRows.length; k++)
{
PdfPTable table = new PdfPTable(1);
table.setSpacingAfter(0);
table.setSpacingBefore(0);
table.setTotalWidth(document.right() - document.left());
table.setLockedWidth(true);
PdfPTable outerTable = new PdfPTable(table);
table.setHeaderRows(1);
table.setSkipFirstHeader(true);
addHeader(table, "Header Row continued " + k, Color.LIGHT_GRAY);
addHeader(table, "Header Row normal " + k, Color.LIGHT_GRAY);
for (int i = 1; i < maxCountRows[k - 1]; i++)
{
StringBuilder sb = new StringBuilder();
for (int p = 0; p < (maxCountRows[k - 1] * 6); p++)
{
sb.append("Text Row ");
}
add(table, sb.toString() + i, Color.WHITE);
}
float verticalPosition = writer.getVerticalPosition(true);
System.out.println("------Table " + k);
if ((verticalPosition - table.getTotalHeight()) <= document.bottom())
{
System.out.println("........................................Last Row splitted");
}
outerTable.addCell(new PdfPCell(table));
document.add(outerTable);
}
document.close();
}
catch (Exception de)
{
de.printStackTrace();
}
}
private static void addHeader(final PdfPTable table, final String text, final Color color)
{
PdfPCell pdfCellHeader = new PdfPCell();
pdfCellHeader.setBackgroundColor(color);
pdfCellHeader.addElement(new Paragraph(new Phrase(text, FontFactory.getFont(BODY_FONT, 8f,
Color.BLUE))));
table.addCell(pdfCellHeader);
}
private static void add(final PdfPTable table, final String text, final Color color)
{
PdfPCell pdfCellHeader = new PdfPCell();
pdfCellHeader.setBackgroundColor(color);
pdfCellHeader.addElement(new Paragraph(new Phrase(text, FontFactory.getFont(BODY_FONT, 5f,
Color.GREEN))));
table.addCell(pdfCellHeader);
}
}
And the output it produces is here. Isn't that what you expected to achieve?
来源：https://stackoverflow.com/questions/16865687/itext-how-to-find-last-row-is-split-into-next-page