Question

下面是我在三列页面设置中设置pdf的代码，现在在“在此处插入代码”我想从数据库中插入一个表。

前。水果清单+价格。

那我怎么能这样做？

    public void createPdf(String dest) throws IOException {
     //Initialize PDF document
     PdfDocument pdf = new PdfDocument(new PdfWriter(dest));

     // Initialize document
     Document document = new Document(pdf);

     //Set column parameters
       Rectangle[] columns = {
new Rectangle(20, 15, 175, 802),
new Rectangle(207, 15, 175, 802),
new Rectangle(394, 15, 175, 802) };
     document.setRenderer(new ColumnDocumentRenderer(document, columns));    

     PdfFont font = PdfFontFactory.createFont(FontConstants.TIMES_ROMAN);
     PdfFont bold = PdfFontFactory.createFont(FontConstants.HELVETICA_BOLD);
     document.setTextAlignment(TextAlignment.JUSTIFIED)
         .setFont(font)
         .setHyphenation(new HyphenationConfig("en", "uk", 3, 3));

    ????
    ???? INSERT CODE HERE

     //Close document
     document.close();
 }

这是关于如何从mysql数据库获取表的代码

          try {
                    Class.forName(driver);
                    conn = DriverManager.getConnection(url+db, user, pass);
                    Statement st = conn.createStatement();
                    String zero = dates.getSelectedItem().toString();
                    String sql = "select fruits,price from fruitstable";
                    pst=conn.prepareStatement(sql);
                    rs=pst.executeQuery();

                    Rectangle react = writer.getPageSize();
                    PdfPTable table2 = new PdfPTable(new float[] { 5,5});
                    table2.setTotalWidth(527);
                    table2.getDefaultCell().setBorder(Rectangle.NO_BORDER);
                    PdfPCell cell = new PdfPCell(new Paragraph(""));
                    cell.setColspan(8);
                    cell.setHorizontalAlignment(Element.ALIGN_LEFT);
                    cell.setBackgroundColor(BaseColor.GRAY);
                    table2.addCell(cell);
                    table2.getDefaultCell().setHorizontalAlignment(Element.ALIGN_CENTER);


                    while(rs.next()){

                        String v1 = rs.getString("fruits");
                        String v2 = rs.getString("price");





                        table2.getDefaultCell().setHorizontalAlignment(Element.ALIGN_LEFT);
                        table2.addCell(new Paragraph(""+v1+"", FontFactory.getFont(FontFactory.TIMES_ROMAN,14,BaseColor.BLACK)));
                        table2.addCell(new Paragraph(""+v2+"", FontFactory.getFont(FontFactory.TIMES_ROMAN,14,BaseColor.BLACK)));


                    }
                    table2.addCell(new Paragraph(" ", FontFactory.getFont(FontFactory.TIMES_ROMAN,8,BaseColor.BLACK)));
                    table2.addCell(new Paragraph(" ", FontFactory.getFont(FontFactory.TIMES_ROMAN,8,BaseColor.BLACK)));


                    document.add(table2);

                } catch (Exception e) {
                JOptionPane.showMessageDialog(null, e);
                }

现在我怎么能这样做？将表格插入3个圆柱页面中，以便我可以设法最大限度地减少纸张空间的使用。
任何人？抱歉我的英语不好。
请指导我，甚至帮助我。

Answer 1

您将仅在iText 7（document.setRenderer(new ColumnDocumentRenderer(document, columns));等）中使用的代码与仅在iText 5中有效的代码（例如iText 7中没有PdfPTable）混合使用。这无法发挥作用。

如果代码不起作用，我会将您的iText 5代码改编为iText 7代码：

Class.forName(driver);
conn = DriverManager.getConnection(url+db, user, pass);
Statement st = conn.createStatement();
String zero = dates.getSelectedItem().toString();
String sql = "select fruits,price from fruitstable";
pst=conn.prepareStatement(sql);
rs=pst.executeQuery();

Table table = new PdfPTable(2); // create a table with 2 columns
// Why did you create a table with width 527?
// You are already divising your page in 3 columns.
// Why would you try to stuff a table that spans the complete width
// of a page in a column that is only 1/3 of a page???
table.setWidthPercent(100);
// Also: you were setting the colspan of a cell to 8
// in a table with only two columns. Why???
table.addHeaderCell("Fruits");
table.addHeaderCell("Price");
while (rs.next()) {
    table.addCell(rs.getString("fruits"));
    table.addCell(rs.getString("price"));
}
document.add(table);

如果您希望表格使用不同的字体，可以像这样更改字体：

PdfFont font = PdfFontFactory.createFont(FontConstants.TIMES_ROMAN);
table.setFont(font);

您还可以将Cell对象传递给表。例如：

table.addHeaderCell(new Cell().add("fruits").setFontColor(Color.ORANGE));

教程iText 7: Building blocks

中对此进行了解释

从数据库到ITEXT7的表格使用3列页面设置生成的PDF

1 个答案: