有简单方法

public String getDateTimeByMillisecond(String str) {

Date date = new Date(Long.valueOf(str));

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");

String time = format.format(date);

return time;

}

也有自己写的复杂方法

将毫秒转化为日期

import java.awt.BorderLayout;

import java.awt.Frame;

import java.awt.TextArea;

import java.awt.TextField;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import java.text.SimpleDateFormat;

import java.util.Date;

public class ConvertLong2Date extends Frame

{

TextField tf = new TextField();

TextArea ta = new TextArea();

public static void main(String［］ args)

{

new ConvertLong2Date().launchFrame();

}

public String convertL2D(long l)

{

long _l = 0L;

Date _d = null;

SimpleDateFormat _sdf = null;

String _s = null;

_l = l;

_d = new Date(_l);

_sdf = new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”);

_s = _sdf.format(_d);

return _s;

}

public void launchFrame()

{

setLocation(300， 300);

setSize(480， 320);

setResizable(false);

add(tf，BorderLayout.SOUTH);

add(ta，BorderLayout.NORTH);

pack();

tf.addActionListener(new tfActionListener());

this.setVisible(true);

this.addWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

});

}

public class tfActionListener implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

long l = Long.parseLong(tf.getText());

ta.setText(new ConvertLong2Date().convertL2D(l));

tf.setText(“”);

}

}

}

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