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可能重复：
为什么 JTable 标题没有出现在图像中？
在面板上绘制 JTable 行和列

我正在开发一个报告应用程序，我必须在其中以报告的形式导出 JTable。但是当我尝试直接在 PDF 上绘制 JTable 时，它​​不会显示第一行和第一列的边框。为此，我尝试使用默认颜色网格左上边框。这在 PDF 中给了我一条较暗的线。但是，当尝试用颜色填充任何特定单元格并将其导出到 PDF 输出时，所有网格线都是不可见的。

简单表演示.java：

package com.swing.table;

import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.FileOutputStream;
import java.util.HashMap;
import java.util.Map;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.border.LineBorder;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;

import com.itextpdf.text.Document;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfTemplate;
import com.itextpdf.text.pdf.PdfWriter;
import com.swing.data.BorderCellRenderer;

public class SimpleTableDemo extends JPanel implements ActionListener  {
    private boolean DEBUG = false;
    private int spacing = 6;
    private Map columnSizes = new HashMap();
    String[] columnNames = { "First Name", "Last Name", "Sport", "# of Years",
            "Vegetarian" };

    Object[][] data = {
            {
                    "Kathy",
                    "Smith",
                    "SnowboardingXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
                    new Integer(5), new Boolean(false) },
            { "John", "Doe", "Rowing", new Integer(3), new Boolean(true) },
            { "Sue", "Black", "Knitting", new Integer(2), new Boolean(false) },
            { "Jane", "White", "Speed reading", new Integer(20),
                    new Boolean(true) },
            { "Joe", "Brown", "Pool", new Integer(10), new Boolean(false) } };

    final JTable table = new JTable(data, columnNames);

    public SimpleTableDemo() {
        super(new GridLayout(0, 1));

        table.setPreferredScrollableViewportSize(new Dimension(500, 70));
        // table.setFillsViewportHeight(true);

        // Create the scroll pane and add the table to it.
        JScrollPane scrollPane = new JScrollPane(table);


        BorderCellRenderer cellRenderer = new BorderCellRenderer();  
        cellRenderer.setBorder(new LineBorder(Color.BLACK));

        table.setDefaultRenderer(Object.class, cellRenderer);
        table.repaint();


        // Add the scroll pane to this panel.
        add(scrollPane);

        JButton button = new JButton("Create Pdf");
        button.addActionListener(this);
        add(button);


    }

    public void actionPerformed(ActionEvent e)
    {
        print();
    }

     private void print() {
            Document document = new Document(PageSize.A4.rotate());
            try {
              PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("D:/jTable.pdf"));

              document.open();
              PdfContentByte cb = writer.getDirectContent();

              cb.saveState();

              PdfTemplate pdfTemplate = cb.createTemplate(table.getWidth(), table.getHeight());
              Graphics2D g2 = pdfTemplate.createGraphics(table.getWidth(), table.getHeight());
              /*g2.setColor(Color.BLACK);
              g2.drawRect(x-2, y-2, table.getWidth()+2, table.getHeight()+2);*/
              table.print(g2);

              cb.addTemplate(pdfTemplate, 20, 20);
              g2.dispose();
              cb.restoreState();
            } catch (Exception e) {
              System.err.println(e.getMessage());
            }
            document.close();
          }

    /**
     Create the GUI and show it. For thread safety, this method should be
     invoked from the event-dispatching thread.
     */
    private static void createAndShowGUI() {
        // Create and set up the window.
        JFrame frame = new JFrame("SimpleTableDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // Create and set up the content pane.
        SimpleTableDemo newContentPane = new SimpleTableDemo();
        newContentPane.setOpaque(true); // content panes must be opaque
        frame.setContentPane(newContentPane);

        // Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        // Schedule a job for the event-dispatching thread:
        // creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}

BorderCellRenderer.java：

package com.swing.data;

import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.border.*;

/**
 * @version 1.0 03/06/99
 */
public class BorderCellRenderer extends JLabel
    implements TableCellRenderer {
  protected Border noFocusBorder; 
  protected Border columnBorder; 
  protected Font font;

  public Font getFont() {
    return font;
}

public void setFont(Font font) {
    this.font = font;
}

public BorderCellRenderer() {
    noFocusBorder = new EmptyBorder(1, 2, 1, 2);
    setOpaque(true);
  }

  public Component getTableCellRendererComponent(JTable table, Object value,
                 boolean isSelected, boolean hasFocus, int row, int column) {
      setText((value == null) ? "" : value.toString());
      Border b;
      b = BorderFactory.createCompoundBorder();
     // b = BorderFactory.createCompoundBorder(b, BorderFactory.createMatteBorder(0,0,1,0,table.getGridColor()));
     // b = BorderFactory.createCompoundBorder(b, BorderFactory.createMatteBorder(0,0,0,1,table.getGridColor()));
     /* if(row == 0 && column == 0)
      {
          setBackground(Color.CYAN);

      }
      else
      {
      setBackground(Color.WHITE);
      }
      */
      if(row==0 || column == 0)
      {
          if(row ==0 && column==0)
          {
              b = BorderFactory.createCompoundBorder(b, BorderFactory.createMatteBorder(0,1,0,0,table.getGridColor()));
              b = BorderFactory.createCompoundBorder(b, BorderFactory.createMatteBorder(1,0,0,0,table.getGridColor()));
          }
          if(row == 0)
          {
              b = BorderFactory.createCompoundBorder(b, BorderFactory.createMatteBorder(1,0,0,0,table.getGridColor()));
              setBackground(Color.CYAN);
          }
          if(column == 0)
          {
              b = BorderFactory.createCompoundBorder(b, BorderFactory.createMatteBorder(0,1,0,0,table.getGridColor()));
          }
      }
      else
      {
          b = table.getBorder();
          setBackground(Color.WHITE);
      }
      setBorder(b);



      return this;
  }

  public void setColumnBorder(Border border) {
    columnBorder = border;
  }

  public Border getColumnBorder() {
    return columnBorder;
  }
}

请尝试使用上面的代码并帮助我获得带有网格线和填充单元格颜色的一对一 PDF 输出。

更新 1：- 我修改了 actionPerformed() 方法的代码，如下所示：-

public void actionPerformed(ActionEvent e)
    {
        int x = table.getWidth();
            int y = table.getHeight();
            BufferedImage bi = null;

    if(x>0 && y>0)
    {
     bi = new BufferedImage(x, y, BufferedImage.TYPE_INT_RGB);
    if(bi != null)
            {
                Graphics g = bi.createGraphics();
                table.paint(g);
                JOptionPane.showMessageDialog(null, new JLabel(new ImageIcon(bi)));
            }
    }


        print();
    }

感谢您查看我的代码。我的要求是不显示表格标题。我不想按预期打印标题。这就是为什么我的第一行顶部边框和左侧第一列丢失的原因。为了纠正这个问题，我手动将默认网格边框添加到第一列和第一行。这使得顶部边框看起来是深灰色的。除此之外，我还必须用颜色填充单元格。当我将其打印到缓冲图像时看起来不错，但后来在 pdf 上它从下面的屏幕截图中删除了我的网格线：-

JTable 到 bufferedImage 输出 BufferedImage JTable 打印输出：-

JTable到pdf输出 jTable pdf输出

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