import java.awt.*;

import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
public class JScrollpane2 implements ActionListener{
     JScrollPane scrollPane;
   
     public JScrollpane2(){
        JFrame f=new JFrame("JScrollPaneDemo");
        Container contentPane=f.getContentPane();
      
        JLabel label1=new JLabel(new ImageIcon(".\\icons\\flower.jpg"));        
        JPanel panel1=new JPanel();
        panel1.add(label1);
        scrollPane=new JScrollPane();
        /*设置窗口显示组件为panel1
         */
        scrollPane.setViewportView(panel1);
        /*设置水平与垂直表头
         */
        scrollPane.setColumnHeaderView(new JLabel("水平表头"));
        scrollPane.setRowHeaderView(new JLabel("垂直表头"));
        /*设置scrollPane的边框凹陷立体边框。边框(Border)部份我们将在以后介绍。
         */
        scrollPane.setViewportBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED));
        /*设置scrollPane的边角图案，由于JScrollPane为矩形形状，因此就有4个位置来摆放边角(Corner)
         *组件，这4个地方分别是左上、左下、右上、右下，对应的参数分别如下:
         *JScrollPane.UPPER_LEFT_CORNER
         *JScrollPane.LOWER_LEFT_CORNER
         *JScrollPane.UPPER_RIGHT_CORNER
         *JScrollPane.LOWER_RIGHT_CORNER
         */
        scrollPane.setCorner(JScrollPane.UPPER_LEFT_CORNER,new JLabel(new ImageIcon(".\\icons\\glass.jpg")));
        scrollPane.setCorner(JScrollPane.UPPER_RIGHT_CORNER,new JLabel(new ImageIcon(".\\icons\\glass.jpg")));
      
        JPanel panel2=new JPanel(new GridLayout(3,1));
        JButton b=new JButton("显示水平滚动轴");
        b.addActionListener(this);
        panel2.add(b);
        b=new JButton("不要显示水平滚动轴");
        b.addActionListener(this);
        panel2.add(b);
        b=new JButton("适时显示水平滚动轴");
        b.addActionListener(this);
        panel2.add(b);
      
        contentPane.add(panel2,BorderLayout.WEST);
        contentPane.add(scrollPane,BorderLayout.CENTER);
      
        f.setSize(new Dimension(350,220));
        f.show();
        f.addWindowListener(new WindowAdapter(){
             public void windowClosing(WindowEvent e){
                System.exit(0);
             }
          }
        );            
     }        
          public void actionPerformed(ActionEvent e){
             if(e.getActionCommand().equals("显示水平滚动轴"))
                scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
             if(e.getActionCommand().equals("不要显示水平滚动轴"))
                scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
           
             if(e.getActionCommand().equals("适时显示水平滚动轴"))
                scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
             scrollPane.revalidate();//重新显示JScrollPane形状。
          }
          public static void main(String[] args){
                  new JScrollpane2();
      }