文章标题毫秒值转日期，工具类

public class Test {
public static void main(String[] args) {
long now = System.currentTimeMillis();
change(now);

}

public static void change(long a) {
DateFormat formatter = new SimpleDateFormat("yyyy年MM月dd日 hh:mm:ss");
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(a);
String year = formatter.format(calendar.getTime());
System.out.println(" 转化后：" + year);
}
}