Java I18N

最新推荐文章于 2025-08-17 17:30:16 发布

原创最新推荐文章于 2025-08-17 17:30:16 发布 · 892 阅读

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#java #numbers #string #date #properties #output

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博客围绕Java国际化展开，介绍了需国际化的元素，如消息、日期、数字等。给出语言和国家代码的查询地址，展示了获取支持的Locale定义的方法。通过示例代码演示了资源包查找、数字和货币、日期和时间、消息的格式化操作。

- What to be internationalized ?
   Messages
   Labels on GUI
   Online help
   Sounds
   Graphics
   Icons
   Dates
   Times
   Numbers
   Currencies
   Measurements
   Phone Numbers
   Honorifics and personal titles
   Postal address
   Page layouts

- Language Code & Country Code
http://ftp.ics.uci.edu/pub/ietf/http/related/iso639.txt (Language Code)
http://userpage.chemie.fu-berlin.de/diverse/doc/ISO_3166.html (Country Code)

- Find out which Locale definitions are supported by the DateFormat class
Locale list[] = DateFormat.getAvailableLocales();

- Example Code
String languageCode = "en";
String countryCode = "US";
Locale currentLocale = new Locale(languageCode, countryCode);

ResourceBundle labels = ResourceBundle.getBundle("LabelsBundle",currentLocale);
System.out.println(labels.getString("ok"));

- The order of ResourceBundle looking up properties file
If defaule locale is en_US
Locale currentLocale = new Locale("fr", "CA", "UNIX");
ResourceBundle introLabels = ResourcBundle.getBundle("ButtonLabel", currentLocale);
ButtonLable_fr_CA_UNIX
ButtonLable_fr_CA
ButtonLable_fr
ButtonLable_en_US
ButtonLable_en
ButtonLable

- How to format Numbers and Currencies
Double amount = new Double(345987.246);
numberFormatter = NumberFormat.getNumberInstance(currentLocale);
amountOut = numberFormatter.format(amount);
============================================================
Double currency = new Double(9876543.21);
currencyFormatter = NumberFormat.getCurrencyInstance(currentLocale);
currencyOut = currencyFormatter.format(currency);
============================================================
percentFormatter = NumberFormat.getPercentInstance(currentLocale);
percentOut = percentFormatter.format(percent);

- How to format Dates and Times
dateFormatter = DateFormat.getDateInstance(DateFormat.DEFAULT, currentLocale);
today = new Date();
dateOut = dateFormatter.format(today);

timeFormatter = DateFormat.getTimeInstance(DateFormat.DEFAULT, currentLocale);
dateTimeFormatter = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, currentLocale);

SimpleDateFormat formatter = new SimpleDateFormat(pattern, currentLocale);
Date today = new Date();
String output = formatter.format(today);

- How to format Messages
MessageFormat formatter = new MessageFormat("");
formatter.setLocale(currentLocale);
formatter.applyPattern("template = At {2,time,short} on {2,date,long}, we detected {1,number,integer} spaceships on the planet {0}.");
String output = formatter.format(messageArguments);