Java学习（五）

package test.com;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Toolkit;
import java.io.File;

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.border.EmptyBorder;

public class FileUtils {

public static void listenDirectory(File dir) throws IllegalAccessException{

if(!dir.exists()){

throw new IllegalAccessException("目录"+dir+"不存在。");
}

if(!dir.isDirectory()){
throw new IllegalArgumentException(dir+"不是目录");
}
String[] fileNames = dir.list();
JList fileList = new JList(fileNames);

String[] likes ={".mp3",".mp4",".jpg",".txt"};

JComboBox combox =new JComboBox(likes);


JFrame frm = new JFrame();
frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


JPanel contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(6, 10, 10, 10));
contentPane.setLayout(new BorderLayout(5, 5));
contentPane.add(combox, BorderLayout.NORTH);

JPanel pane = new JPanel();
pane.setLayout(new BorderLayout(8, 8));

JLabel label = new JLabel("File lists");
label.setFont(new Font("Serif",Font.PLAIN,16));



fileList.setForeground(Color.BLACK);
fileList.setBackground(Color.green);
fileList.setSelectionBackground(new Color(87,49,134));
fileList.setSelectionForeground(new Color(140,171,226));

JScrollPane scrollPane = new JScrollPane(fileList);
scrollPane.setColumnHeaderView(label);


pane.add(scrollPane, BorderLayout.CENTER);
contentPane.add(pane, BorderLayout.CENTER);

frm.add(contentPane);

frm.setBounds(500,300,300,400);
frm.setVisible(true);
}

public static void main(String[] args) {

try {
FileUtils.listenDirectory(new File("D:\\")) ;
} catch (IllegalAccessException e) {

e.printStackTrace();
}

}
}