如何在java中使用itext创建pdf

我想使用itext创建一个pdf，在我的jsp文件中，我创建了一个按钮，每当有人点击该按钮时，pdf必须下载，这里的大多数东西都工作正常，但我无法添加我的表内容，它在表的位置显示为空。我的段落已添加，但在段落之后，我想添加一个不添加的小表格。请有人帮我解决这些问题，以下是我的代码：

/itext.jsp

function downloadfForm()
{
    document.location.href = './downloadPDF';
}


 <div class="col-md-3 col-sm-3">
          <div class="form-group">
              <label class="no-bold hidden hidden-md hidden-lg">&nbsp;</label>
              <a href="javascript:void(0)" class="btn btn-warning mutual-funds-submit-anchor" onclick="downloadfForm()">downloadfForm</a>             
          </div>          
          </div>

---

尝试以下代码使用iText库在pdf中创建表。希望这对您有所帮助

        PdfPTable table1 = new PdfPTable(4);

        float[] columnWidths1 = new float[]{30f, 10f, 30f, 10f};
        table1.setWidths(columnWidths1);

        table1.setWidthPercentage(100);
        table1.setHorizontalAlignment(table.ALIGN_JUSTIFIED);
        PdfPCell c1 = new PdfPCell(new Phrase("Details", blackNormalFont));
        c1.setHorizontalAlignment(Element.ALIGN_CENTER);

        c1.setBackgroundColor(BaseColor.GRAY);
        table1.addCell(c1);

        c1 = new PdfPCell(new Phrase("Amount (Rs)", blackNormalFont));
        c1.setHorizontalAlignment(Element.ALIGN_CENTER);
        c1.setBackgroundColor(BaseColor.GRAY);
        c1.setHorizontalAlignment(Element.ALIGN_RIGHT);
        table1.addCell(c1);

        c1 = new PdfPCell(new Phrase("Deductions by HDBFS", blackNormalFont));
        c1.setHorizontalAlignment(Element.ALIGN_CENTER);
        c1.setBackgroundColor(BaseColor.GRAY);
        table1.addCell(c1);

        c1 = new PdfPCell(new Phrase("Amount (Rs)", blackNormalFont));
        c1.setHorizontalAlignment(Element.ALIGN_CENTER);
        c1.setBackgroundColor(BaseColor.GRAY);

        table1.addCell(c1);

        table1.setHeaderRows(1);

        table1.addCell(new Phrase("A. Product Cost", blackNormalFont));

        c1 = new PdfPCell(new Phrase(
                CustomFormat.NUMBER_0.format(23233223), blackNormalFont));
        c1.setHorizontalAlignment(Element.ALIGN_RIGHT);
        table1.addCell(c1);

        table1.addCell(new Phrase("1. Processing Fees", blackNormalFont));
        c1 = new PdfPCell(new Phrase(
                CustomFormat.NUMBER_0.format(3232332), blackNormalFont));
        c1.setHorizontalAlignment(Element.ALIGN_RIGHT);
        table1.addCell(c1);


        document.add(table1);

        document.close();

        PdfPTable table1 = new PdfPTable(4);

        float[] columnWidths1 = new float[]{30f, 10f, 30f, 10f};
        table1.setWidths(columnWidths1);

        table1.setWidthPercentage(100);
        table1.setHorizontalAlignment(table.ALIGN_JUSTIFIED);
        PdfPCell c1 = new PdfPCell(new Phrase("Details", blackNormalFont));
        c1.setHorizontalAlignment(Element.ALIGN_CENTER);

        c1.setBackgroundColor(BaseColor.GRAY);
        table1.addCell(c1);

        c1 = new PdfPCell(new Phrase("Amount (Rs)", blackNormalFont));
        c1.setHorizontalAlignment(Element.ALIGN_CENTER);
        c1.setBackgroundColor(BaseColor.GRAY);
        c1.setHorizontalAlignment(Element.ALIGN_RIGHT);
        table1.addCell(c1);

        c1 = new PdfPCell(new Phrase("Deductions by HDBFS", blackNormalFont));
        c1.setHorizontalAlignment(Element.ALIGN_CENTER);
        c1.setBackgroundColor(BaseColor.GRAY);
        table1.addCell(c1);

        c1 = new PdfPCell(new Phrase("Amount (Rs)", blackNormalFont));
        c1.setHorizontalAlignment(Element.ALIGN_CENTER);
        c1.setBackgroundColor(BaseColor.GRAY);

        table1.addCell(c1);

        table1.setHeaderRows(1);

        table1.addCell(new Phrase("A. Product Cost", blackNormalFont));

        c1 = new PdfPCell(new Phrase(
                CustomFormat.NUMBER_0.format(23233223), blackNormalFont));
        c1.setHorizontalAlignment(Element.ALIGN_RIGHT);
        table1.addCell(c1);

        table1.addCell(new Phrase("1. Processing Fees", blackNormalFont));
        c1 = new PdfPCell(new Phrase(
                CustomFormat.NUMBER_0.format(3232332), blackNormalFont));
        c1.setHorizontalAlignment(Element.ALIGN_RIGHT);
        table1.addCell(c1);


        document.add(table1);

        document.close();