[java]String和Date、Timestamp之间的转换

java

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());

以上是 [java]String和Date、Timestamp之间的转换 的全部内容, 来源链接: utcz.com/z/393115.html

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