java - 在最后一页底部创建pdf表格(错误的官方解决方案)

Question

This is official iText solution for creating a table on the last page at the bottom in pdf document.该解决方案将我的表格放在最后一个 pdf 页的底部。太棒了。

不幸的是，这也导致我的 table 变得更窄。这就是我不想要的。我已经尝试了几个小时来让 table 再次变宽，但没有成功。我无法解决它。移动前如何将 table 按原来尺寸放在底部？这个问题的最佳解决方案是什么？

问题图片

在移动之前，我的表格的宽度仅基于table.setWidthPercentage(100)创建；然后就开始报异常，表格的宽度必须大于零。

table.setWidths(我的表格中的列数);

我尝试将 table.setTotalWidth() 设置为非零值，然后用 iText 的官方代码覆盖它。但没有成功。我正在寻找一些优雅的解决方案。

代码:

public static void main(String[] args)
{
    Document document = new Document(PageSize.A4);
    PdfWriter writer = null;
try {
    writer = PdfWriter.getInstance(document,
    new FileOutputStream("C:/radek-folder/calendar.pdf"));
} catch (FileNotFoundException e) {
    e.printStackTrace();
}
   document.open();

   PdfPTable datatable = createHeaderTable();
   document.add(datatable);
   datatable = createFooterTable();

   drawTableAtTheEndOfPage(document, writer, datatable);

   document.close();
   System.out.println("done");
}

private static void drawTableAtTheEndOfPage(Document document, PdfWriter writer,    PdfPTable datatable) {      
   datatable.setTotalWidth(document.right(document.rightMargin()) - document.left(document.leftMargin()));

   datatable.writeSelectedRows(0, -1, document.left(document.leftMargin()),
   datatable.getTotalHeight() + document.bottom(document.bottomMargin()),
   writer.getDirectContent());
}

   private static PdfPTable createFooterTable() throws DocumentException {
   int[] columnWidths = new int[] { 1, 1, 1, 1, 1, 1, 1, 1, 1 };
   PdfPTable datatable = new PdfPTable(columnWidths.length);
   datatable.setKeepTogether(true);
   datatable.setWidthPercentage(100);
   datatable.setWidths(columnWidths);
   datatable.getDefaultCell().setPadding(5);

   datatable.getDefaultCell().setHorizontalAlignment(horizontalAlignment);
   datatable.getDefaultCell().setVerticalAlignment(verticalAlignment);

   for (int i = 0; i < 100; i++) {
       addCellToTable(datatable, horizontalAlignmentLeft, 
   verticalAlignmentMiddle, "Přehledová tabulka", columnWidths.length, 1, 
   fontTypeBold, fontSizeRegular, cellLayout_Bottom);
   }

   return datatable;
}

Answer 1

I inserted(document.leftMargin() - 50) for example, and it moved with table to the side. I tried various values, but i havent found the suitable ones. In three days at work i will try zero :-)

你现在应该尝试零!

确实，that official sample和 the answer here on stack overflow当他们在此处应用边距时，该示例派生略有错误:

datatable.setTotalWidth(document.right(document.rightMargin()) - 
    document.left(document.leftMargin()));

datatable.writeSelectedRows(0, -1, document.left(document.leftMargin()),
    datatable.getTotalHeight() + document.bottom(document.bottomMargin()),
    writer.getDirectContent());

因为 Document 方法 left、bottom、right 和 top他们自己已经应用了匹配边距，例如

public float left(float margin) {
    return pageSize.getLeft(marginLeft + margin);
}

因此，推荐的代码有效地应用了两次边距!

所以你的方法drawTableAtTheEndOfPage应该看起来像这样:

private static void drawTableAtTheEndOfPage(Document document, PdfWriter writer, PdfPTable datatable)
{
    datatable.setTotalWidth(document.right() - document.left());

    datatable.writeSelectedRows(0, -1, document.left(),
            datatable.getTotalHeight() + document.bottom(), writer.getDirectContent());
}