Question

可能重复：
How to export one to one JTable in the pdf

我正在编写一个报告应用程序，我必须以报告的形式导出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列边框。为此，我尝试使用默认颜色网格左上边框。这给了我一个更深的PDF格式。但是，当尝试使用颜色填充任何特定单元格并将其导出为PDF输出时，所有网格线都是不可见的。

SimpleTableDemo.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头。我不想按预期打印标题。这就是为什么我的第1行顶部边框和第1列遗留下来的原因。为了纠正这个问题，我手动为第一列和第一行添加了一个默认网格边框。这使得顶部边框看起来是深灰色。除此之外，我还必须用细胞填充细胞。当我将它打印到缓冲的图像时看起来不错，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 print output:-

JTable到pdf输出 jTable pdf output

抱歉，我再次发布了封闭的帖子。任何改进我的代码的好建议都会非常有用。

Answer 1

使用iText。第三方库，可帮助您转换为pdf

public class JTable2Pdf extends JFrame {
private JTable table;

public JTable2Pdf() {
getContentPane().setLayout(new BorderLayout());
createTable();
}
private void createTable() {
Object[][] data = {{ "a", "b", "e", 4, false } };
String[] columnNames = { "A", "B", "C", "D", "E" };

table = new JTable(data, columnNames);

JPanel tPanel = new JPanel(new BorderLayout());
tPanel.add(table.getTableHeader(), BorderLayout.NORTH);
tPanel.add(table, BorderLayout.CENTER);

getContentPane().add(tPanel, BorderLayout.CENTER);
}

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

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

  cb.saveState();
  Graphics2D g2 = cb.createGraphicsShapes(500, 500);

  Shape oldClip = g2.getClip();
  g2.clipRect(0, 0, 500, 500);

  table.print(g2);
  g2.setClip(oldClip);

  g2.dispose();
  cb.restoreState();
} catch (Exception e) {
  System.err.println(e.getMessage());
}
document.close();
}
 public static void main(String[] args) {
JTable2Pdf frame = new JTable2Pdf();
frame.pack();
frame.setVisible(true);
frame.print();
}
}

如何在没有表格标题和填充彩色单元格的情况下在pdf上导出JTable

1 个答案: