public static void main(String[] args) {
        try {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
            // 根據時間戳獲取時間
            long nowTime = 1379313866505l;
            String date = sdf.format(new Date(nowTime));
            System.out.println(System.currentTimeMillis());
            // 根據時間獲取時間戳
            String dateString = "2013-09-23 08:50:11";
            Date date1 = sdf.parse(dateString);
            System.out.println(date1.getTime());
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
 

寫一個cmd指令碼，雙擊即可開啟工具。

javac TextArea.java
pause
java TextArea
pause
原始碼：
package com.swing;

//: gui/TextArea.java
// Using the JTextArea control.
import javax.swing.*;

import java.awt.*;
import java.awt.event.*;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;

public class TextArea extends JFrame {
  private JButton
    b = new JButton("TimeStamp To Date"),
    d = new JButton("Date To TimeStamp"),
    c = new JButton("Clear Data");
  private JTextArea t = new JTextArea(20, 40);
  private Map<String,String> m =
    new HashMap<String,String>();
  public TextArea() {
    // Use up all the data:
//    m.putAll(Countries.capitals());
    b.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
    	SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		long nowTime = Long.parseLong(t.getText());
		String date = sdf.format(new Date(nowTime));
    	System.out.println(date);
        t.append("\n"+date+"\n");
      }
    });
    d.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
	      	try {
				SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
				String dateString = t.getText();
				Date date1 = sdf.parse(dateString);
				System.out.println(date1.getTime());
				t.append("\n"+date1.getTime()+"\n");
			} catch (Exception e1) {
				e1.printStackTrace();
			}
        }
    });
    c.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        t.setText("");
      }
    });
    setLayout(new FlowLayout());
    add(new JScrollPane(t));
    add(b);
    add(d);
    add(c);
  }
  public static void main(String[] args) {
    run(new TextArea(), 500, 600);
  }
  
  public static void run(final JFrame f, final int width, final int height) {
    SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        f.setTitle(f.getClass().getSimpleName());
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(width, height);
        f.setVisible(true);
      }
    });
  }
} ///:~