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import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
public class SQLDate {
public static void main(String[] args){
System.out.println(System.currentTimeMillis()); //結(jié)果：1244711626453
java.util.Date date1 = new java.util.Date();
System.out.println(date1.toString()); //結(jié)果: Thu Jun 11 16:27:57 CST 2009
//java.sql.Date extends java.util.Date
java.sql.Date date2 = new java.sql.Date(System.currentTimeMillis());
System.out.println(date2.toString()); //結(jié)果: 2009-06-11
java.sql.Date date3 = new java.sql.Date(date1.getTime());
System.out.println(date3.toString()); //結(jié)果：2009-06-11
//Timestamp extends java.util.Date
Timestamp stamp1 = new Timestamp(System.currentTimeMillis());
System.out.println(stamp1.toString()); //結(jié)果： 2009-06-11 16:27:57.75
Timestamp stamp2 = new Timestamp(date1.getTime());
System.out.println(stamp2.toString()); //結(jié)果：2009-06-11 16:52:56.171
//日期時間轉(zhuǎn)換成格式化的字符串
SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
//format(java.util.Date date), Timestamp是java.util.Date的子類
String timeStr = sdf.format(stamp1);
System.out.println(timeStr); //結(jié)果：2009/06/11 16:52:56
//SimpleDateFormat extends DateFormat，DateFormat是抽象類
DateFormat df = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
String timeStr2 = df.format(date1);
String timeStr3 = df.format(date2);
System.out.println(timeStr2); //結(jié)果：2009/06/11 16:52:56
System.out.println(timeStr3); //結(jié)果： 2009/06/11 16:52:56
//字符串轉(zhuǎn)化為日期時間
try {
//parse()中的參數(shù)必須與sdf中定義的格式一致,否則拋異常
java.util.Date date6 = sdf.parse("2009/12/10 5:12:02");
System.out.println(date6.toString()); //結(jié)果: Thu Dec 10 05:12:02 CST 2009
java.sql.Date date7 = new java.sql.Date(date6.getTime());
System.out.println(date7.toString()); //結(jié)果: 2009-12-10
//注意: sdf.parse()返回值是java.util.Date類型,不能轉(zhuǎn)化成java.sql.Date類型
//java.sql.Date date8 = (java.sql.Date)sdf.parse("2009/12/10 5:12:02"); //不可行
Timestamp stamp9 = new Timestamp(date7.getTime());
System.out.println(stamp9.toString()); //結(jié)果: 2009-12-10 05:12:02.0
} catch (ParseException e) {
e.printStackTrace();
}
}
}
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