Java中获取当前时间的常用方法

//方法1

//MM要大写,ss要小写,DD大写表示一年中的第几天,dd小写表示一月中的第几天;大写HH和小写hh表示24小时制和12小时制

                Date date=new Date();  

                //格式化日期  

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 

                System.out.println(sdf.format(date));

//方法2
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) + 1;  //c.get(Calendar.MONTH)返回月份索引，从0开始，所以进行加1操作

                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); 

//方法3(不常用)

                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

                System.out.println(sdf.format(System.currentTimeMillis()));