————————————在JPanel中加进背景图片————————————
//import javax swing
import javax.swing.JPanel;
import javax.swing.ImageIcon;

//import java awt
import java.awt.Graphics;
import java.awt.Dimension;

/**
* This class defines a panel that can draw an image in the background.
* To do this,I overrid the paintCompponent method,that's the
* only thing necessery.
*/

public class ImageBackgroundPanel extends JPanel {
  private ImageIcon image = null;

  public ImageBackgroundPanel(ImageIcon image) {
    this.image = image;
  }

  protected void paintComponent(Graphics g) {
    setOpaque(true);
    super.paintComponent(g);

    Dimension d = getSize();
    for( int x = 0; x < d.width; x += image.getIconWidth() )
      for( int y = 0; y < d.height; y += image.getIconHeight() )
      g.drawImage( image.getImage(), x, y, null, null );

  }
}

————————————自己ｌｏａｄ一个主页————————————
package org.PhotoResizer.test;

import java.io.*;

import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;

public class HyperLink
    extends JFrame {
  JEditorPane jEditorPane1 = new JEditorPane();
  JScrollPane jScrollPane1 = new JScrollPane();

  public HyperLink() {
    try {
      jbInit();
    }
    catch (Exception e) {
      e.printStackTrace();
    }
  }

  public static void main(String[] args) {
    HyperLink HyperLink = new HyperLink();
    HyperLink.show();
  }

  private void jbInit() throws Exception {
    jEditorPane1.setText("Hello");
//    String url="file:"+System.getProperty("user.dir")+System.getProperty("file.separator")+
//        "java.util.Date.html";
//    try {
//      jEditorPane1.setPage(url);
//    }
//    catch (Exception ex) {
//      throw new Exception(ex);
//    }
    this.setDefaultCloseOperation(EXIT_ON_CLOSE);
    this.getContentPane().add(jScrollPane1, BorderLayout.CENTER);
    jScrollPane1.getViewport().add(jEditorPane1, null);
    jEditorPane1.setEditable(false);
    Runtime rt = Runtime.getRuntime();
    try {
//change here of the URL
      jEditorPane1.setPage("http://www.163.com");
    }
    catch (Exception ex) {

    }

    jEditorPane1.addHyperlinkListener(new HyperlinkListener() {
      public void hyperlinkUpdate(HyperlinkEvent hle) {
        if (hle.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
          Runtime rt = Runtime.getRuntime();

          try {
            jEditorPane1.setPage(hle.getURL());
            //如果你想要连接系统浏览器的话。。。
//            rt.exec("cmd /c start " + hle.getURL());
          }
          catch (IOException e1) {
            System.err.println(e1);
          }
        }
      }
    });

  }
}

————————————让窗口始终在前————————————
1,The upstair tell you a best way.

2,You can extends JWindow
override show() like this:
public void show()
{
super.show();
this.requestFocus();
}
and then add a window listener for
the focus lost event:

addFocusListener (new java.awt.event.FocusAdapter () {
public void focusLost (java.awt.event.FocusEvent evt) {
this.toFront();
}
}
);
It seems to work for me...

3.You can also try to use thread, I recommend this way.
/**
* Call this from class consructor
*/
public void initialize() {
TopThread top = new TopThread();
top.start();
}

/**
* Keep JWindow on top (inner class)
*/
class TopThread extends Thread {
public void run() {
while(true) {
toFront();
/**
* Let 10 milliseconds for other code to execute
*/
try {
Thread.sleep(10);
}
catch(Exception e) {
// do what you wanna do
}
}
}
}

You can see:http://forum.java.sun.com/thread.jsp?forum=57&thread=166992
That's some others discuss it.
————————————带行号的jtable类————————————
用另一个可以显示行号的JTable或JList做JScrollPane的setRowHeaderView(Component view)

下面是我临时做的一个最简单的例子

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

public class LineNumberTable extends JFrame {
    public static void main(String[] args) {
        try{
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch(Exception e){
        }
        LineNumberTable jl=new LineNumberTable();
        jl.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jl.setBounds(100,100,600,400);
        jl.show();
    }

    public LineNumberTable() {
        Container co = super.getContentPane();
        co.setLayout(new BorderLayout());
        JTable table = new JTable(100,5);
        JScrollPane sp = new JScrollPane(table);
        RowHeader rowHeader=new RowHeader(table);
        sp.setRowHeaderView(rowHeader);
        sp.getRowHeader().setPreferredSize(new Dimension(35,10));
        co.add(sp,BorderLayout.CENTER);
    }
}

class RowHeader extends JTable{
  public RowHeader(JTable table) {
      LineNumberModel listModel=new LineNumberModel(table.getModel());
      this.setModel(listModel);
      this.setRowHeight(table.getRowHeight());
      this.getColumn("").setCellRenderer(new RowHeaderRenderer());
      this.setAutoscrolls(false);
  }
}

class LineNumberModel extends AbstractTableModel{
      TableModel model;
      public LineNumberModel(TableModel mod){
          this.model=mod;
      }
      public int getRowCount(){
          return model.getRowCount();
      }
      public int getColumnCount(){
          return 1;
      }
      public String getColumnName(int columnIndex){
          return "";
      }
      public Object getValueAt(int rowIndex,
                         int columnIndex){
          return "";
      }
      public boolean isCellEditable(int row, int column) {
          return false;
      }
}

class RowHeaderRenderer  extends JButton implements TableCellRenderer {
  Insets zeroInsets = new Insets(0,0,0,0);
  RowHeaderRenderer() {
    setOpaque(true);
    setBorder(UIManager.getBorder("TableHeader.cellBorder"));
    setHorizontalAlignment(CENTER);
  }
  public Insets getInsets(){
      return zeroInsets;
  }

  public Component getTableCellRendererComponent(JTable table, Object value,
                          boolean isSelected, boolean hasFocus, int row, int column) {
      this.setText(""+(row+1));
      return this;
  }
}
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