Java获取当前时间戳/时间戳转换

package com.jsoft.testjavabasics.test1;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/**


Hello world!




@author jim


@date 2017/11/25

*/
public class App {
public static void main(String[] args) {
// 精确到毫秒
// 获取当前时间戳
        System.out.println(System.currentTimeMillis());

System.out.println(Calendar.getInstance().getTimeInMillis());

System.out.println(new Date().getTime());
 </span><span style="color: #008000;">//</span><span style="color: #008000;"> 精确到秒
 </span><span style="color: #008000;">//</span><span style="color: #008000;"> 获取当前时间戳</span>
 System.out.println(System.currentTimeMillis() / 1000<span style="color: #000000;">);
 System.out.println(Calendar.getInstance().getTimeInMillis() </span>/ 1000<span style="color: #000000;">);
 System.out.println(</span><span style="color: #0000ff;">new</span> Date().getTime() / 1000<span style="color: #000000;">);

 </span><span style="color: #008000;">//</span><span style="color: #008000;"> 精确到毫秒
 </span><span style="color: #008000;">//</span><span style="color: #008000;"> 获取指定格式的时间</span>
 SimpleDateFormat df = <span style="color: #0000ff;">new</span> SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS"<span style="color: #000000;">);
 </span><span style="color: #008000;">//</span><span style="color: #008000;"> 输出字符串</span>
 System.out.println(df.format(<span style="color: #0000ff;">new</span><span style="color: #000000;"> Date()));
 </span><span style="color: #008000;">//</span><span style="color: #008000;"> 获取指定时间Date对象，参数是时间戳，只能精确到秒</span>
 System.out.println(<span style="color: #0000ff;">new</span> Date(1510369871<span style="color: #000000;">));
 df.getCalendar();
 </span><span style="color: #008000;">//</span><span style="color: #008000;"> 获取指定时间的时间戳</span>
 <span style="color: #0000ff;">try</span><span style="color: #000000;"> {
     System.out.println(</span><span style="color: #0000ff;">new</span> SimpleDateFormat("yyyy/MM/dd HH:mm:ss:SSS").parse("2017/11/11 11:11:11:111"<span style="color: #000000;">).getTime());
 } </span><span style="color: #0000ff;">catch</span><span style="color: #000000;"> (ParseException e) {
     e.printStackTrace();
 }

}

}