Blackberry日期时间字符串格式 [英] Blackberry date time string formatting
问题描述
我需要解析日期/时间字符串，添加原始偏移量并根据本地时区进行转换.
I need to parse the date/time string, to add the raw offset and convert it according to local time zone.
我从服务器获取的日期时间的格式为:"05-25-2012 02:30 PM"
The date time that I get from server is in this format : "05-25-2012 02:30 PM"
HttpDateParser.parse(time)方法无法解析此格式
This format is not parsed by : HttpDateParser.parse(time) method
但是HttpDateParser会解析以下格式:"25-MAY-2012 02:30 PM"
But HttpDateParser does parse this format : "25-MAY-2012 02:30 PM"
您能告诉我，我应该如何解析BB中的"05-25-2012 02:30 PM"字符串以获取长值.
Can you tell me, how should I parse "05-25-2012 02:30 PM" String in BB to get a long value.
我还有1个问题，我需要以GMT，IST格式显示时区，但是我只能显示的是Asia/Calcutta，America/Los_Angeles等.
I have 1 more problem, I need to display time zone in format GMT, IST, but all I can display is Asia/Calcutta, America/Los_Angeles and so..
推荐答案
BlackBerry Java缺少开发人员在桌面Java甚至Android Java应用程序中惯用的一些有用的字符串处理和日期格式API.因此，您必须自己进行一些解析，如果您需要处理时区，这是很痛苦的.您没有说服务器所在的时区，所以即使您在问题中显示的字符串没有时区信息，我也必须假设您知道.
BlackBerry Java is missing some useful String handling and Date formatting APIs that developers are used to in Desktop Java, or even Android Java applications. So, you have to do some of the parsing yourself, and it's a pain if you need to handle time zones. You didn't say what time zone your server is in, so I have to assume that you know that, even though the string you show in your question doesn't have time zone information.
免责声明: 此代码并非直接来自我的一个应用程序，因此尚未通过严格测试.这是概念的证明.您必须测试自己的所有时区，并可能验证它在夏时制转换期间是否可以正常工作.另外，请参见
Disclaimer: this code does not come straight out of one of my apps, so it has not been through rigorous testing. It is a proof of concept. You'll have to test all your own time zones, and probably verify that it works during daylight savings time changeovers. Also, see the blackberry API docs for information about limitations of the TimeZone.getOffset() method I use here.
首先输入:
import java.util.Date;
import java.util.TimeZone;
import java.util.Hashtable;
import java.util.Calendar;
import net.rim.device.api.i18n.SimpleDateFormat;
import net.rim.device.api.io.http.HttpDateParser;
import net.rim.device.api.util.StringUtilities;
然后，解析服务器给定字符串的代码.我假设此时间是在服务器的当前时区(针对夏令时进行调整)，或者在其他某些已知的时区(可能不是移动客户端的时区).更改我的值 New_York ，以适合您的已知服务器时区:
Then, the code to parse the string given by the server. I assume that this time is either in the server's current time zone, adjusted for daylight savings, or in some other known time zone that may not be the mobile client's time zone. Change my value, New_York, for the known server time zone to suit your needs:
private Date parseServerTime(String timeFromServer) {
// separate the time string into tokens, which accepts ' ' or '-' or ':' as delimeters
String tokens[] = StringUtilities.stringToKeywords(timeFromServer);
int month = Integer.parseInt(tokens[0]);
int day = Integer.parseInt(tokens[1]);
int year = Integer.parseInt(tokens[2]);
int hours = Integer.parseInt(tokens[3]);
int minutes = Integer.parseInt(tokens[4]);
boolean isPm = tokens[5].equalsIgnoreCase("PM");
// convert hours to 24 hour time
if (hours == 12 && !isPm) {
hours = 0;
} else if (hours != 12 && isPm) {
hours += 12;
}
int millisToday = ((hours * 60) + minutes) * 60 * 1000;
StringBuffer reformattedTime = new StringBuffer();
// reorder the year, month and day to be able to use HttpDateParser (YYYY-MM-DDTHH:mm)
reformattedTime.append(tokens[2]).append('-').append(tokens[0]).append('-').append(tokens[1]);
reformattedTime.append('T').append(hours).append(':').append(minutes);
long unadjustedTimeFromServer = HttpDateParser.parse(reformattedTime.toString());
int monthIndex = month - 1;
// This example assumes the server is giving us a time from the Eastern US time zone
TimeZone serverZone = TimeZone.getTimeZone("America/New_York");
int serverOffset = serverZone.getOffset(1, // 1 -> AD, not BC
year,
monthIndex,
day,
1, // I'm not sure, but I don't think day-of-week matters here?
millisToday);
return new Date(unadjustedTimeFromServer - serverOffset);
}
然后，我使用客户端的设备时区和您想要的用于时区显示的短代码来格式化为客户端解析的Date:
Then, I format the parsed Date for the client, using their device's time zone, and the short code you want for time zone display:
private String formatClientTime(Date dateFromServer) {
TimeZone clientZone = TimeZone.getDefault();
String tzKey = clientZone.toString();
String[] tzDisplayNames = StringUtilities.stringToKeywords((String) _timeZones.get(tzKey));
// we might have to use the "daylight" time zone short code
Calendar cal = Calendar.getInstance(clientZone);
cal.setTime(dateFromServer);
int clientOffset = clientZone.getOffset(1, cal.get(Calendar.YEAR), cal.get(Calendar.MONTH),
cal.get(Calendar.DAY_OF_MONTH), cal.get(Calendar.DAY_OF_WEEK), cal.get(Calendar.MILLISECOND));
int rawOffset = clientZone.getRawOffset();
// if the daylight savings time adjusted offset isn't equal to the raw offset, we
// must be in daylight savings time
boolean isTimeDuringDaylightSavings = (clientOffset != rawOffset);
String tzCode = isTimeDuringDaylightSavings ? tzDisplayNames[1] : tzDisplayNames[0];
// TODO: change this to whatever output format you want to use for the UI
SimpleDateFormat formatter = new SimpleDateFormat("MM/dd/yyyy hh:mm aa");
return formatter.formatLocal(dateFromServer.getTime()) + " " + tzCode;
}
我像这样使用所有这些代码:
And I use all this code like so:
mapTimeZoneCodes();
Date date = parseServerTime("05-25-2012 02:30 PM");
String text = formatClientTime(date);
我的mapTimeZoneCodes()方法只是一个实用程序，用于初始化您不喜欢的BlackBerry长时区字符串("Asia/Calcutta")和短代码("IST")之间的映射.据我所知，BlackBerry没有提供API来显示人们习惯的短代码，至少对于OS 5.0，许多开发人员仍需要支持这些短代码.您可能选择将其重构为静态实用程序类.这是我基于
My mapTimeZoneCodes() method is just a utility to initialize a mapping between the long BlackBerry time zone strings that you don't like ("Asia/Calcutta") and the short codes ("IST"). As far as I know, BlackBerry provides no API to display the short codes that people are used to, at least for OS 5.0, which many developers still need to support. You might choose to refactor this into a static utility class. Here is the mapping I used, based on this article on Desktop Java.
我只想填写一些时区字符串映射，以进行测试.如果要使用此功能，您需要填写其余的内容，或者至少填写应用所需的内容，否则可能会崩溃.请注意，我使用的表每个时区都需要两个(子)字符串，以节省夏令时.如果您愿意，可以在完成工作后更新解决方案.但是，我会留给你.
I only bothered to fill in a few of the time zone string mappings, to test this out. If you want to use this, you'll need to fill in the rest, or at least the ones your app needs, or it will probably crash. Notice that the table I use needs two (sub)strings for each time zone, for daylight savings. If you feel like it, you could update the solution when you finish the work. But, I'll leave that to you.
private Hashtable _timeZones;
private void mapTimeZoneCodes() {
// TODO: you can uncomment this code and use it to generate your map of time zone ids and short codes
//String[] ids = TimeZone.getAvailableIDs();
//for (int i = 0; i < ids.length; i++) {
// System.out.println(" _timeZones.put(\"" + ids[i] + "\", \"\");");
//}
_timeZones = new Hashtable();
_timeZones.put("Pacific/Kwajalein", "");
_timeZones.put("Pacific/Midway", "");
_timeZones.put("Pacific/Honolulu", "");
_timeZones.put("America/Anchorage", "");
_timeZones.put("America/Tijuana", "");
_timeZones.put("America/Los_Angeles", "PST PDT");
_timeZones.put("America/Phoenix", "");
_timeZones.put("America/Denver", "MST MDT");
_timeZones.put("America/Tegucigalpa", "");
_timeZones.put("America/Tegucigalpa_2", "");
_timeZones.put("America/El_Salvador", "");
_timeZones.put("America/Regina", "");
_timeZones.put("America/Chicago", "CST CDT");
_timeZones.put("America/Mexico_City", "");
_timeZones.put("America/Mexico_City_2", "");
_timeZones.put("America/Bogota", "");
_timeZones.put("America/Indianapolis", "");
_timeZones.put("America/New_York", "EST EDT");
_timeZones.put("America/Caracas", "");
_timeZones.put("America/La_Paz", "");
_timeZones.put("America/Manaus", "");
_timeZones.put("America/Santiago", "");
_timeZones.put("America/Halifax", "");
_timeZones.put("America/St_Johns", "");
_timeZones.put("America/Montevideo", "");
_timeZones.put("America/Guyana", "");
_timeZones.put("America/Buenos_Aires", "");
_timeZones.put("America/Sao_Paulo", "");
_timeZones.put("America/Godthab", "");
_timeZones.put("America/South_Georgia", "");
_timeZones.put("Atlantic/Cape_Verde", "");
_timeZones.put("Atlantic/Azores", "");
_timeZones.put("GMT", "GMT");
_timeZones.put("Europe/Dublin", "");
_timeZones.put("Africa/Luanda", "");
_timeZones.put("Europe/Amsterdam", "");
_timeZones.put("Europe/Belgrade", "");
_timeZones.put("Europe/Brussels", "");
_timeZones.put("Europe/Belgrade Yugoslavia(YU)", "");
_timeZones.put("Africa/Windhoek", "");
_timeZones.put("Asia/Amman", "");
_timeZones.put("Africa/Harare", "");
_timeZones.put("Asia/Jerusalem", "");
_timeZones.put("Europe/Minsk", "");
_timeZones.put("Africa/Cairo", "");
_timeZones.put("Asia/Beirut", "");
_timeZones.put("Europe/Athens", "");
_timeZones.put("Europe/Helsinki", "");
_timeZones.put("Asia/Kuwait", "");
_timeZones.put("Africa/Nairobi", "");
_timeZones.put("Asia/Baghdad", "");
_timeZones.put("Europe/Moscow", "");
_timeZones.put("Asia/Tehran", "");
_timeZones.put("Asia/Tbilisi", "");
_timeZones.put("Asia/Muscat", "");
_timeZones.put("Asia/Baku", "");
_timeZones.put("Asia/Yerevan", "");
_timeZones.put("Asia/Caucasus", "");
_timeZones.put("Asia/Kabul", "");
_timeZones.put("Asia/Karachi", "");
_timeZones.put("Asia/Tashkent", "");
_timeZones.put("Asia/Yekaterinburg", "");
_timeZones.put("Asia/Calcutta", "");
_timeZones.put("Asia/Colombo", "");
_timeZones.put("Asia/Katmandu", "");
_timeZones.put("Asia/Dhaka", "");
_timeZones.put("Asia/Almaty", "");
_timeZones.put("Asia/Rangoon", "");
_timeZones.put("Asia/Bangkok", "");
_timeZones.put("Asia/Krasnoyarsk", "");
_timeZones.put("Asia/Hong_Kong", "");
_timeZones.put("Asia/Kuala_Lumpur", "");
_timeZones.put("Australia/Perth", "");
_timeZones.put("Asia/Taipei", "");
_timeZones.put("Asia/Irkutsk", "");
_timeZones.put("Asia/Tokyo", "");
_timeZones.put("Asia/Seoul", "");
_timeZones.put("Asia/Yakutsk", "");
_timeZones.put("Australia/Darwin", "");
_timeZones.put("Australia/Adelaide", "");
_timeZones.put("Pacific/Guam", "");
_timeZones.put("Asia/Vladivostok", "");
_timeZones.put("Australia/Hobart", "");
_timeZones.put("Australia/Brisbane", "");
_timeZones.put("Australia/Sydney", "");
_timeZones.put("Asia/Magadan", "");
_timeZones.put("Pacific/Fiji", "");
_timeZones.put("Pacific/Auckland", "");
_timeZones.put("Pacific/Tongatapu", "");
}
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