第16周周四：GUI编程及文件对话框的使用 项目一：文件及选择

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;

public class FileChooser extends JFrame implements ActionListener{
JButton open = null;
JTextField jtfPath = null;
public static void main(String[] args) {
new FileChooser();
}
public FileChooser(){
this.setLayout(new FlowLayout());
open=new JButton("open");
open.addActionListener(this);
this.add(open);
jtfPath = new JTextField("选择的文件",40);
jtfPath.setEditable(false);     // 不可编辑
jtfPath.setHorizontalAlignment(JTextField.CENTER);    // 居中
this.add(jtfPath);
this.setBounds(400, 200, 700, 500);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
open.addActionListener(this);
}
public void actionPerformed(ActionEvent e) {
JFileChooser jfc=new JFileChooser();
jfc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
jfc.showDialog(new JLabel(),"选择");
File file=jfc.getSelectedFile();
if(file.isDirectory()){
System.out.println("文件夹:"+file.getAbsolutePath());
}else if(file.isFile()){
System.out.println("文件:"+file.getAbsolutePath());
}
System.out.println(jfc.getSelectedFile().getName());
}
}