字符串到joda LocalDate,格式为“dd-MMM-yy” [英] String to joda LocalDate in format of "dd-MMM-yy"
问题描述
我正在使用JAXB和joda时间2.2。将数据从Mysql备份到XML并将其还原。在我的表中,我有一个Date属性,格式为16-Mar-05。我成功地将其存储在XML中。但是当我想从XML读取并将其放回Mysql表中时,我无法获得正确的格式。
I am using JAXB and joda time 2.2. to backup the data from Mysql to XML and restore it back. in my Table I have a Date attribute in format of "16-Mar-05". I successfully store this in XML. but when I want to read it from XML and put it back in Mysql table, I cant get the right format.
这是我的XMLAdapter类,这里是unmarshal方法input String是16-Mar-05,但我不能以16-Mar-05的格式获取localDate变量,尽管我将模式设置为dd-MMM-yy。我发布了我尝试的所有选项,如何在16d-05-05格式的dd-MMM-yy中获取我的localDate?
this is my XMLAdapter class, here in unmarshal method the input String is "16-Mar-05", but I cant get the localDate variable in the format of "16-Mar-05", although I am setting pattern to "dd-MMM-yy". I posted all the options I tried, how can I get my localDate in "dd-MMM-yy" like 16-Mar-05format?
谢谢!!
public class DateAdapter extends XmlAdapter<String, LocalDate> {
// the desired format
private String pattern = "dd-MMM-yy";
@Override
public String marshal(LocalDate date) throws Exception {
//return new SimpleDateFormat(pattern).format(date);
return date.toString("dd-MMM-yy");
}
@Override
public LocalDate unmarshal(String date) throws Exception {
if (date == null) {
return null;
} else {
//first way
final DateTimeFormatter dtf = DateTimeFormat.forPattern("dd-MMM-yy");
final LocalDate localDate2 = dtf.parseLocalDate(date);
//second way
LocalDate localDate3 = LocalDate.parse(date,DateTimeFormat.forPattern("dd-MMM-yy"));
//third way
DateTimeFormatter FORMATTER = DateTimeFormat.forPattern("dd-MMM-yy");
DateTime dateTime = FORMATTER.parseDateTime(date);
LocalDate localDate4 = dateTime.toLocalDate();
return localDate4;
}
}
推荐答案
所以我拿了你的代码并运行它,它对我来说很好......
So I took your code and ran it and it works fine for me...
问题,我认为,你所拥有的是你期待 LocalDate
用于维护原始解析对象的格式的对象,这不是 LocalDate
的工作方式。
The problem, I think, you're having is that you're expecting a LocalDate
object to maintain the format that you original parsed the object with, this is not how LocalDate
works.
LocalDate
是日期或时间段的表示,它不是格式。
LocalDate
is a representation of date or period in time, it is not a format.
LocalDate
有一个 toString
方法,可用于转储对象的值,它,这是对象用来提供人类可读表示的内部格式。
LocalDate
has a toString
method which can be used to dump the value of the object, it, this is a internal format used by the object to provide a human readable representation.
要格式化日期,您需要使用某种格式化程序,这将采用该模式你想要和日期值并返回字符串
To format the date, you need to use some kind of formater, that will take the pattern you want and a date value and return a String
例如,以下代码...
For example, the following code...
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
String date = "16-Mar-05";
DateTimeFormatter dtf = DateTimeFormat.forPattern("dd-MMM-yy");
LocalDate localDate2 = dtf.parseLocalDate(date);
System.out.println(localDate2 + "/" + dtf.print(localDate2));
//second way
LocalDate localDate3 = LocalDate.parse(date, DateTimeFormat.forPattern("dd-MMM-yy"));
System.out.println(localDate3 + "/" + dtf.print(localDate3));
//third way
DateTimeFormatter FORMATTER = DateTimeFormat.forPattern("dd-MMM-yy");
DateTime dateTime = FORMATTER.parseDateTime(date);
LocalDate localDate4 = dateTime.toLocalDate();
System.out.println(localDate4 + "/" + FORMATTER.print(localDate4));
生成...
2005-03-16/16-Mar-05
2005-03-16/16-Mar-05
2005-03-16/16-Mar-05
在您对此感到不安之前,这就是Java Date $ c $的方式c>也可以。
Before you get upset about this, this is how Java Date
works as well.
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