[java]String和Date、Timestamp之间的转换
一、String与Date(java.util.Date)互转
1.1 String -> Date
Date date = DateFormat.parse(String str);
String dateStr = "2010/05/04 12:34:23";Date date = new Date();
//注意format的格式要与日期String的格式相匹配
DateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
try {
date = sdf.parse(dateStr);
System.out.println(date.toString());
} catch (Exception e) {
e.printStackTrace();
}
1.2 Date -> String
String str = DateFormat.format(Date date);
String dateStr = "";Date date = new Date();
//format的格式可以任意
DateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
DateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH/mm/ss");
try {
dateStr = sdf.format(date);
System.out.println(dateStr);
dateStr = sdf2.format(date);
System.out.println(dateStr);
} catch (Exception e) {
e.printStackTrace();
}
二、String与Timestamp互转
2.1 String ->Timestamp
Timestamp ts = Timestamp.valueOf(String str);
Timestamp ts = new Timestamp(System.currentTimeMillis());String tsStr = "2011-05-09 11:49:45";
try {
ts = Timestamp.valueOf(tsStr);
System.out.println(ts);
} catch (Exception e) {
e.printStackTrace();
}
注:String的类型必须形如: yyyy-mm-dd hh:mm:ss[.f...] 这样的格式,中括号表示可选,否则报错
2.2 Timestamp -> String
方法1:String str = DateFormat.format(Timestamp ts);
方法2:String str = Timestamp.toString();
Timestamp ts = new Timestamp(System.currentTimeMillis());String tsStr = "";
DateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
try {
//方法一
tsStr = sdf.format(ts);
System.out.println(tsStr);
//方法二
tsStr = ts.toString();
System.out.println(tsStr);
} catch (Exception e) {
e.printStackTrace();
}
三、Date( java.util.Date )和Timestamp互转
Date和Timestamp是父子类关系
3.1 Timestamp(子类) -> Date(父类)
Timestamp ts = new Timestamp(System.currentTimeMillis());Date date = new Date();
try {
date = ts;
System.out.println(date);
} catch (Exception e) {
e.printStackTrace();
}
3.2 Date -> Timestamp
父类不能直接向子类转化,可借助中间的String。
注:使用以下方式更简洁
Timestamp ts = new Timestamp(date.getTime());
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