java时间戳与日期转换

    Long timeStamp = System.currentTimeMillis();  //获取当前时间戳
    System.out.println(timeStamp);
    SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String sd = sdf.format(Long.parseLong(String.valueOf(timeStamp)));
    String sd2 = sdf.format(new Date(Long.parseLong(String.valueOf(timeStamp))));
    String sd3 = sdf.format(timeStamp);
    System.out.println("转换结果：" + sd);
    System.out.println("转换结果：" + sd2);
    System.out.println("转换结果：" + sd3);