Java获取系统时间

1、通过Date类来获取当前时间

Date day=new Date();    
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 
System.out.println(df.format(day));

2、通过System类中的currentTimeMillis方法来获取当前时间

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");   
System.out.println(df.format(System.currentTimeMillis()));

3、通过Calendar类来获取当前时间

Calendar c = Calendar.getInstance();//可以对每个时间域单独修改   
int year = c.get(Calendar.YEAR);  
 int month = c.get(Calendar.MONTH);   
int date = c.get(Calendar.DATE);    
int hour = c.get(Calendar.HOUR_OF_DAY);   
int minute = c.get(Calendar.MINUTE);   
int second = c.get(Calendar.SECOND);    
System.out.println(year   "/"   month   "/"   date   " "  hour   ":"  minute   ":"   second);

4、通过Date类来获取当前时间

Date date = new Date();    
String year = String.format("%tY", date);   
String month = String.format("%tB", date);   
String day = String.format("%te", date);    
System.out.println("今天是：" year "-" month "-" day);

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