Question

怎么把string转换datetime

Answer 1

(1)
Date转换为Datetime

Datetime在java数据库中对应的是Timestamp，转换如下：

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//java.util.Date转换为Timestamp

Date date = new Date();

Timestamp timestamp = new Timestamp(date.getTime()); //2013-01-14 22:45:36.484
//java.util.Date转换为Timestamp
Date date = new Date();
Timestamp timestamp = new Timestamp(date.getTime()); //2013-01-14 22:45:36.484

(2) String转换为Date

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//String转换为java.util.Date

String str = "2013-01-14";

SimpleDateFormat sdf = new SimpleDateFormat("-MM-dd");

Date date = null; //初始化date

try {

date = sdf.parse(str); //Mon Jan 14 00:00:00 CST 2013

} catch (ParseException e) {

e.printStackTrace();

}
//String转换为java.util.Date
String str = "2013-01-14";
SimpleDateFormat sdf = new SimpleDateFormat("-MM-dd");
Date date = null; //初始化date
try {
date = sdf.parse(str); //Mon Jan 14 00:00:00 CST 2013
} catch (ParseException e) {
e.printStackTrace();
}

(3)
Date转换为String

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//java.util.Date转换为String

Date date = new Date();

DateFormat format = new SimpleDateFormat("-MM-dd");

String str = format.format(date); //2013-01-14
//java.util.Date转换为String
Date date = new Date();
DateFormat format = new SimpleDateFormat("-MM-dd");
String str = format.format(date); //2013-01-14

(4)
String转化为java.sql.Date

转换为java.sql.Date目的是要对数据库进行操作

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//String转换为java.sql.Date

String str = "2013-01-14";

SimpleDateFormat sdf = new SimpleDateFormat("-MM-dd");

java.sql.Date sdate = null; //初始化

try {

java.util.Date udate = sdf.parse(str);

sdate = new java.sql.Date(udate.getTime()); //2013-01-14

} catch (ParseException e) {

e.printStackTrace();

}