JAVA中DATE、String、timestamp相互转换

1 date 转 string

Date now = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String time = sdf.format(now);
System.out.println(time);

2 string 转 date

Date date = null;
String str = "2012-04-08 18:44:30";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
try {
date = sdf.parse(str);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

3 string 转 timestamp

String str = "2011-01-01 00:00:00"; //注意：timestamp是long型的字符串必须是到秒的格式
Timestamp ts = Timestamp.valueOf(str);
System.out.println(ts);

4 timestamp 转 string

Timestamp now = new Timestamp(System.currentTimeMillis());
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String time = sdf.format(now);

5 date 转 timestamp

Date now = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String time = sdf.format(now);
Timestamp ts = Timestamp.valueOf(time );

6 timestamp 转 date

Date date = null;
Timestamp now = new Timestamp(System.currentTimeMillis());
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String time = sdf.format(now);
try {
date = sdf.parse(time);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}