java 时间字符串和时间戳（长整形long）之间的互转

import java.util.Date;
import java.text.SimpleDateFormat;

class Test {
public static void main(String[] args) {
Date date1 = new Date();
long l = date1.getTime();
System.out.println(l);

long date2 = System.currentTimeMillis();
System.out.println(date2);

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String date3 = sdf.format(new Date().getTime());
System.out.println(date3);
}
}