如何在pdf上打印bufferedImage

Posted 2021-04-03

我正在研究pdf报告申请。运用

itext 5.3.3.jar jdk 1.6

我想在pdf上打印JTable。我正确地获得了JTable图像，但无法在pdf上获取图像。无论如何，我可以在pdf上打印BufferedImage。我用下面的代码： -

如果可能的话，尝试在pdf上编写bufferedImage。

private static void print(BufferedImage bi,JTable table) { 
    Document document = new Document(PageSize.A4.rotate()); 
    try { 
      PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("F:/jTable.pdf")); 

      document.open(); 
      PdfContentByte cb = writer.getDirectContent(); 
      PdfTemplate pdfTemplate = cb.createTemplate(table.getWidth(), table.getHeight()); 
      Image image = Image.getInstance(bi , null); 
      image.scaleToFit(table.getWidth(), table.getHeight()); 
      table.addNotify();
      table.validate();
      Graphics2D g2 = pdfTemplate.createGraphics(table.getWidth(), table.getHeight()); 
      table.print(g2);
      pdfTemplate.addImage(image); 
      /*g2.setColor(Color.BLACK); 
      g2.drawRect(x-2, y-2, table.getWidth()+2, table.getHeight()+2);*/ 
      //table.print(g2); 

      cb.addTemplate(pdfTemplate, 0,20); 



    } catch (Exception e) { 
      System.err.println(e.getMessage()); 
    } 
    document.close(); 
  } 

但它告诉我类似下面的内容： -

图像必须具有绝对定位。线程“main”中的异常com.itextpdf.text.exceptions.IllegalPdfSyntaxException：不平衡的保存/恢复状态运算符。 at com.itextpdf.text.pdf.PdfContentByte.sanityCheck（PdfContentByte.java:3083）at com.itextpdf.text.pdf.PdfContentByte.toPdf（PdfContentByte.java:248）at com.itextpdf.text.pdf.PdfFormXObject。（ PdfFormXObject.java:88）at com.itextpdf.text.pdf.PdfTemplate.getFormXObject（PdfTemplate.java:247）at com.itextpdf.text.pdf.PdfWriter.addXFormsToBody（PdfWriter.java:1293）at com.itextpdf.text .pdf.PdfWriter.addSharedObjectsToBody（PdfWriter.java:1304）at com.itextpdf.text.pdf.PdfWriter.close（PdfWriter.java:1209）at com.itextpdf.text.pdf.PdfDocument.close（PdfDocument.java:768 ）com.site.data.TableImage.print（TableImage.java:102）的com.itextpdf.text.Document.close（Document.java:398）com.swing.data.TableImage.main（TableImage.java： 52）

以下是测试代码： -

package com.swing.data;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;

import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.JTableHeader;

import com.itextpdf.text.Document;
import com.itextpdf.text.Image;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfTemplate;
import com.itextpdf.text.pdf.PdfWriter;



class TableImage {
    BufferedImage bi = null;
    public static void main(String[] args) throws Exception {
        Object[][] data = {
            {"Hari", new Integer(23), new Double(78.23), (true)},
            {"James", new Integer(23), new Double(47.64), (false)},
            {"Sally", new Integer(22), new Double(84.81), (true)}
        };
        String[] columns = {"Name", "Age", "GPA", "Pass"};
        JTable table = new JTable(data, columns);
        JScrollPane scroll = new JScrollPane(table);
        JPanel p = new JPanel(new BorderLayout());
        p.add(scroll, BorderLayout.CENTER);
        JOptionPane.showMessageDialog(null, p);
        JTableHeader h = table.getTableHeader();
        int x = table.getWidth();
        int y = table.getHeight();
        table.setIntercellSpacing(new Dimension(0,0));
        table.setDefaultRenderer(Object.class, new ColumnAlignmentRenderer(table.getDefaultRenderer(Object.class)));
        BufferedImage bi = new BufferedImage(
                x, y, BufferedImage.TYPE_INT_RGB);
        Graphics g = bi.createGraphics();
        Graphics2D g2 = (Graphics2D) g;
        table.paint(g2);
        JOptionPane.showMessageDialog(null, new JLabel(new ImageIcon(bi)));
        print(bi,table);
        //createPdf(true,table);
    }
   private static void print(BufferedImage bi,JTable table) { 
        Document document = new Document(PageSize.A4.rotate()); 
        try { 
          PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("F:/jTable.pdf")); 

          document.open(); 
          PdfContentByte cb = writer.getDirectContent(); 
          PdfTemplate pdfTemplate = cb.createTemplate(table.getWidth(), table.getHeight()); 
          Image image = Image.getInstance(bi , null); 
          image.scaleToFit(table.getWidth(), table.getHeight()); 
          table.addNotify();
          table.validate();
          Graphics2D g2 = pdfTemplate.createGraphics(table.getWidth(), table.getHeight()); 
          table.print(g2);
          pdfTemplate.addImage(image); 
          /*g2.setColor(Color.BLACK); 
          g2.drawRect(x-2, y-2, table.getWidth()+2, table.getHeight()+2);*/ 
          //table.print(g2); 

          cb.addTemplate(pdfTemplate, 0,20); 



        } catch (Exception e) { 
          System.err.println(e.getMessage()); 
        } 
        document.close(); 
      } 
     private TableImage() {
    }
}

谢谢！

答案

你可以简单地从com.itextpdf.text.Image创建java.awt.image.BufferedImage，然后使用标准的iText方法渲染它：

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import javax.imageio.ImageIO;
import com.itextpdf.text.Image;

BufferedImage bufferedImage = ...
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(bufferedImage, "png", baos);
Image iTextImage = Image.getInstance(baos.toByteArray());

有关详细信息，请参阅iText Image Examples。

另一答案

我找到了解决方案：

        Document document = new Document();

        PdfWriter writer = PdfWriter.getInstance(document,
                               new FileOutputStream("Image.pdf"));
        document.open();

        PdfContentByte pdfCB = new PdfContentByte(writer);
        Image image = Image.getInstance(pdfCB, bufferedImage, 1);

另一答案

我找到了this。似乎解释了如何进行绝对定位。我猜你需要这样做。