如何使用Java中的PDFPTable将顶部到底部的2个表添加到单个表

Question

请在此处检查代码。从顶部到底部合并2个PDFPtable面临的问题。

PdfPTable table = new PdfPTable(new float[] { 1.0f, 2.0f, 5.0f, 1.0f, 2.0f });
table.setWidthPercentage(100.0f);

ArrayList<String> lHeaders = new ArrayList<>();
lHeaders.add("S. No.");
lHeaders.add("Course Code");
lHeaders.add("Course Name");
lHeaders.add("Credit");
lHeaders.add("Letter Grade");

ArrayList<String> lData = new ArrayList<>();
lData.add("1");
lData.add("D 210");
lData.add("COMPUTER & INFORMATION TECHNOLOGY FUNDAMENTAL LAB-II");
lData.add("1.0");
lData.add("BB");

// Create and add a title across both columns.

Font headerfont = new Font(Font.TIMES_ROMAN, 15, Font.BOLD);

// PdfPCell cell = new PdfPCell (new Paragraph ("New Mustang
// Features"));

PdfPCell cell;

for (String i : lHeaders) {
    cell = new PdfPCell(new Paragraph(i, headerfont));
    cell.setHorizontalAlignment(Element.ALIGN_CENTER);
    cell.setBackgroundColor(new Color(255, 0, 0));
    // cell.setPadding (10.0f);
    table.addCell(cell);
}

// Add header cells for these columns.

// cell = new PdfPCell (new Paragraph ("Feature"));

// PdfPCell cell1;
Font datafont = new Font(Font.HELVETICA, 10, Font.NORMAL);
for (String j : lData) {
    cell = new PdfPCell(new Paragraph(j, datafont));
    cell.setHorizontalAlignment(Element.ALIGN_LEFT);
    // cell.setPadding (10.0f);
    table.addCell(cell);
}

Font headerfont2 = new Font(Font.TIMES_ROMAN, 10, Font.BOLD);

PdfPTable table2 = new PdfPTable(8);
table2.setWidthPercentage(100.0f);
PdfPCell cell2;
cell2 = new PdfPCell(new Paragraph("CURRENT SEMESTER RECORD", headerfont2));
cell2.setHorizontalAlignment(Element.ALIGN_CENTER);
cell2.setColspan(4);
table2.addCell(cell2);
cell2 = new PdfPCell(new Paragraph("CUMULATIVE SEMESTER RECORD", headerfont2));
cell2.setHorizontalAlignment(Element.ALIGN_CENTER);
cell2.setColspan(4);
table2.addCell(cell2);

cell2 = new PdfPCell(new Paragraph("TOTAL CREDIT POINTS", headerfont2));
cell2.setHorizontalAlignment(Element.ALIGN_CENTER);
table2.addCell(cell2);
cell2 = new PdfPCell(new Paragraph("TOTAL CREDIT", headerfont2));
cell2.setHorizontalAlignment(Element.ALIGN_CENTER);
table2.addCell(cell2);
cell2 = new PdfPCell(new Paragraph("CREDITS EARNED", headerfont2));
cell2.setHorizontalAlignment(Element.ALIGN_CENTER);
table2.addCell(cell2);
cell2 = new PdfPCell(new Paragraph("SGPA", headerfont2));
cell2.setHorizontalAlignment(Element.ALIGN_CENTER);
table2.addCell(cell2);

cell2 = new PdfPCell(new Paragraph("TOTAL CREDIT POINTS", headerfont2));
cell2.setHorizontalAlignment(Element.ALIGN_CENTER);
table2.addCell(cell2);
cell2 = new PdfPCell(new Paragraph("TOTAL CREDIT", headerfont2));
cell2.setHorizontalAlignment(Element.ALIGN_CENTER);
table2.addCell(cell2);
cell2 = new PdfPCell(new Paragraph("CREDITS EARNED", headerfont2));
cell2.setHorizontalAlignment(Element.ALIGN_CENTER);
table2.addCell(cell2);
cell2 = new PdfPCell(new Paragraph("CGPA", headerfont2));
cell2.setHorizontalAlignment(Element.ALIGN_CENTER);
table2.addCell(cell2);
cell2 = new PdfPCell(new Paragraph("Result declared on :", headerfont2));
cell2.setHorizontalAlignment(Element.ALIGN_LEFT);
cell2.setPaddingTop(40);
cell2.setBorderWidthLeft(0.5f);
cell2.setBorderWidthBottom(0.5f);
cell2.setColspan(4);
table2.addCell(cell2);
cell2 = new PdfPCell(new Paragraph("Controller of Examinations", headerfont2));
cell2.setHorizontalAlignment(Element.ALIGN_CENTER);
cell2.setPaddingTop(40);
cell2.setBorderWidthRight(0.5f);
cell2.setBorderWidthBottom(0.5f);
cell2.setColspan(4);
table2.addCell(cell2);

我创建了两个PDFPtable实例，一个是table，另一个是table2，我只想合并这两个实例并从我的代码中返回。可能吗？我不想将其从代码添加到文档中并返回文档实例。 pdf看起来像附件的图像。

Answer 1

总而言之，您实质上希望将这两个表合并为一个表，因为您的方法旨在仅返回一个表。

如果可能的话，最好的解决方案是更改方法的设计，并允许它以Iterable（例如List）或数组的形式返回多个表。

如果这不可能（在您的情况下，返回单个表似乎是项目要求），则解决方案是创建另一个单列表，并将第一个表放入第一行，将第二个表放入第二行。为了获得适当的外观，您可能还需要相应地调整表格属性的边距和边框。

但是请注意，iText 5表不是为密集表堆叠而设计的。在表格内部的表格中放置表格可能会在例如分页符，可能会占用大量资源。