如何在Swing中顯示保存檔對話框？

下麵的示例展示了如何在基於swing的應用程式中創建和顯示另存為檔對話框。

使用以下API -

• JFileChooser - 創建標準檔選擇器，允許用戶保存檔/檔夾。
• JFileChooser.showSaveDialog - 顯示“另存為”對話框。

示例

package com.zaixian.swingdemo;

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.LayoutManager;
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.JPanel;

public class SwingTester {
   public static void main(String[] args) {
      createWindow();
   }

   private static void createWindow() {
      JFrame frame = new JFrame("Swing對話框-檔另保存為");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      createUI(frame);
      frame.setSize(560, 200);
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);
   }

   private static void createUI(final JFrame frame){
      JPanel panel = new JPanel();
      LayoutManager layout = new FlowLayout();
      panel.setLayout(layout);

      JButton button = new JButton("點擊這裏開始~");
      final JLabel label = new JLabel();

      button.addActionListener(new ActionListener() {
         @Override
         public void actionPerformed(ActionEvent e) {
            JFileChooser fileChooser = new JFileChooser();
            int option = fileChooser.showSaveDialog(frame);
            if(option == JFileChooser.APPROVE_OPTION){
               File file = fileChooser.getSelectedFile();
               label.setText("檔保存為: " + file.getName());
            }else{
               label.setText("保存命令取消");
            }
         }
      });

      panel.add(button);
      panel.add(label);
      frame.getContentPane().add(panel, BorderLayout.CENTER);
   }
}

執行上面示例代碼，得到以下結果：