在項目中經常要用到將字符串解析成Locale，但是沒有一個比較好用的類。

java本身提供了3個構造函數，但是實際使用過程中，需要自己解析，比較繁瑣。

Locale(langugae)

locale(language,country)

?

Locale(String language, String country, String variant)

Apache 有個 LocaleUtils.toLocale(String language)但是不支持最后2個字符為小寫的，如:zh_CN支持， zh_cn就不支持。

?參考其它方法，寫了下面的類，做個筆記，也希望對解決類似問題的人有點幫助。

?

?

import?java.util.Locale;

public?class?LocaleUtil
{
????private?final?static?Locale?DEFAULT_LOCALE?=?Locale.ENGLISH;
????
????public?final?static?String?IETF_SEPARATOR?=?"-";??
????
????public?final?static?String?SEPARATOR?=?"_";??
????
????public?final?static?String?EMPTY_STRING?=?"";?
?????
????
????public?static?Locale?toLocale(?String?language?)
????{
????????if(?!StringUtil.isNullOrEmpty(?language?)?)
????????{
????????????return?langToLocale(?language,?SEPARATOR?);
????????}
????????return?DEFAULT_LOCALE;
????}
??????
?????public?static?Locale?langToLocale(?String?lang?,?String?separator?)
?????{
???????????if(?StringUtil.isNullOrEmpty(?lang?)?)
???????????{?
????????????????return?DEFAULT_LOCALE;
???????????}
????????????String?language?=?EMPTY_STRING;
????????????String?country?=??EMPTY_STRING;
????????????String?variant?=??EMPTY_STRING;

????????????int?i1?=?lang.indexOf(?separator?);
????????????if?(?i1?<?0?)
????????????{
????????????????language?=?lang;
????????????}?else?
????????????{
????????????????language?=?lang.substring(0,?i1);
????????????????++i1;
????????????????int?i2?=?lang.indexOf(?separator,?i1);
????????????????if?(i2?<?0)?
????????????????{
????????????????????country?=?lang.substring(i1);
????????????????}?else?
????????????????{
????????????????????country?=?lang.substring(i1,?i2);
????????????????????variant?=?lang.substring(i2+1);
????????????????}
????????????}
????????????
????????????if(language.length()?==?2)
????????????{
???????????????language?=?language.toLowerCase();
????????????}else?
????????????{
??????????????language?=?EMPTY_STRING;
????????????}
????????????
????????????if(country.length()?==?2)
????????????{
???????????????country?=?country.toUpperCase();
????????????}else?
????????????{
??????????????country?=?EMPTY_STRING;
????????????}
????????????
????????????if(?(variant.length()?>?0)?&&?
????????????????((language.length()?==?2)?||(country.length()?==?2))?)
????????????{
???????????????variant?=?variant.toUpperCase();
????????????}else
????????????{
????????????????variant?=?EMPTY_STRING;
????????????}
?????????????????
????????????return?new?Locale(language,?country,?variant?);
????????}
}

?

注意：

public class StringUtil

{
??? public static boolean isNullOrEmpty(String target) {
?? ??? ?return target == null || "".equals(target);
?? ?}

}

?

轉載于:https://www.cnblogs.com/likwo/archive/2010/12/17/1909357.html

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