来自国家/地区名称的 ISO2 国家/地区代码

您可以使用内置类：Locale

Locale l = new Locale("", "CH");
System.out.println(l.getDisplayCountry());

例如，打印“瑞士”。请注意，我没有提供语言。

因此，对于反向查找，您可以做的是从可用国家/地区构建地图：

public static void main(String[] args) throws InterruptedException {
    Map<String, String> countries = new HashMap<>();
    for (String iso : Locale.getISOCountries()) {
        Locale l = new Locale("", iso);
        countries.put(l.getDisplayCountry(), iso);
    }

    System.out.println(countries.get("Switzerland"));
    System.out.println(countries.get("Andorra"));
    System.out.println(countries.get("Japan"));
}

正如其他人提到的那样，Map是最简单的方法，这是我在遇到相同问题的地方编写/使用的内容。

 import java.util.Map;
 import java.util.TreeMap;


 public class CountryCodes {
     final Map<String, String> map = new TreeMap<String, String>   (String.CASE_INSENSITIVE_ORDER);
    public CountryCodes() {

     map.put("Andorra, Principality Of", "AD");
     map.put("United Arab Emirates", "AE");
     map.put("Afghanistan, Islamic State Of", "AF");
     map.put("Antigua And Barbuda", "AG");
     map.put("Anguilla", "AI");
     map.put("Albania", "AL");
     map.put("Armenia", "AM");
     map.put("Netherlands Antilles", "AN");
     map.put("Angola", "AO");
     map.put("Antarctica", "AQ");
     map.put("Argentina", "AR");
     map.put("American Samoa", "AS");
     map.put("Austria", "AT");
     map.put("Australia", "AU");
     map.put("Aruba", "AW");
     map.put("Azerbaidjan", "AZ");
     map.put("Bosnia-Herzegovina", "BA");
     map.put("Barbados", "BB");
     map.put("Bangladesh", "BD");
     map.put("Belgium", "BE");
     map.put("Burkina Faso", "BF");
     map.put("Bulgaria", "BG");
     map.put("Bahrain", "BH");
     map.put("Burundi", "BI");
     map.put("Benin", "BJ");
     map.put("Bermuda", "BM");
     map.put("Brunei Darussalam", "BN");
     map.put("Bolivia", "BO");
     map.put("Brazil", "BR");
     map.put("Bahamas", "BS");
     map.put("Bhutan", "BT");
     map.put("Bouvet Island", "BV");
     map.put("Botswana", "BW");
     map.put("Belarus", "BY");
     map.put("Belize", "BZ");
     map.put("Canada", "CA");
     map.put("Cocos (Keeling) Islands", "CC");
     map.put("Central African Republic", "CF");
     map.put("Congo, The Democratic Republic Of The", "CD");
     map.put("Congo", "CG");
     map.put("Switzerland", "CH");
     map.put("Ivory Coast (Cote D'Ivoire)", "CI");
     map.put("Cook Islands", "CK");
     map.put("Chile", "CL");
     map.put("Cameroon", "CM");
     map.put("China", "CN");
     map.put("Colombia", "CO");
     map.put("Costa Rica", "CR");
     map.put("Former Czechoslovakia", "CS");
     map.put("Cuba", "CU");
     map.put("Cape Verde", "CV");
     map.put("Christmas Island", "CX");
     map.put("Cyprus", "CY");
     map.put("Czech Republic", "CZ");
     map.put("Germany", "DE");
     map.put("Djibouti", "DJ");
     map.put("Denmark", "DK");
     map.put("Dominica", "DM");
     map.put("Dominican Republic", "DO");
     map.put("Algeria", "DZ");
     map.put("Ecuador", "EC");
     map.put("Estonia", "EE");
     map.put("Egypt", "EG");
     map.put("Western Sahara", "EH");
     map.put("Eritrea", "ER");
     map.put("Spain", "ES");
     map.put("Ethiopia", "ET");
     map.put("Finland", "FI");
     map.put("Fiji", "FJ");
     map.put("Falkland Islands", "FK");
     map.put("Micronesia", "FM");
     map.put("Faroe Islands", "FO");
     map.put("France", "FR");
     map.put("France (European Territory)", "FX");
     map.put("Gabon", "GA");
     map.put("Great Britain", "UK");
     map.put("Grenada", "GD");
     map.put("Georgia", "GE");
     map.put("French Guyana", "GF");
     map.put("Ghana", "GH");
     map.put("Gibraltar", "GI");
     map.put("Greenland", "GL");
     map.put("Gambia", "GM");
     map.put("Guinea", "GN");
     map.put("Guadeloupe (French)", "GP");
     map.put("Equatorial Guinea", "GQ");
     map.put("Greece", "GR");
     map.put("S. Georgia & S. Sandwich Isls.", "GS");
     map.put("Guatemala", "GT");
     map.put("Guam (USA)", "GU");
     map.put("Guinea Bissau", "GW");
     map.put("Guyana", "GY");
     map.put("Hong Kong", "HK");
     map.put("Heard And McDonald Islands", "HM");
     map.put("Honduras", "HN");
     map.put("Croatia", "HR");
     map.put("Haiti", "HT");
     map.put("Hungary", "HU");
     map.put("Indonesia", "ID");
     map.put("Ireland", "IE");
     map.put("Israel", "IL");
     map.put("India", "IN");
     map.put("British Indian Ocean Territory", "IO");
     map.put("Iraq", "IQ");
     map.put("Iran", "IR");
     map.put("Iceland", "IS");
     map.put("Italy", "IT");
     map.put("Jamaica", "JM");
     map.put("Jordan", "JO");
     map.put("Japan", "JP");
     map.put("Kenya", "KE");
     map.put("Kyrgyz Republic (Kyrgyzstan)", "KG");
     map.put("Cambodia, Kingdom Of", "KH");
     map.put("Kiribati", "KI");
     map.put("Comoros", "KM");
     map.put("Saint Kitts & Nevis Anguilla", "KN");
     map.put("North Korea", "KP");
     map.put("South Korea", "KR");
     map.put("Kuwait", "KW");
     map.put("Cayman Islands", "KY");
     map.put("Kazakhstan", "KZ");
     map.put("Laos", "LA");
     map.put("Lebanon", "LB");
     map.put("Saint Lucia", "LC");
     map.put("Liechtenstein", "LI");
     map.put("Sri Lanka", "LK");
     map.put("Liberia", "LR");
     map.put("Lesotho", "LS");
     map.put("Lithuania", "LT");
     map.put("Luxembourg", "LU");
     map.put("Latvia", "LV");
     map.put("Libya", "LY");
     map.put("Morocco", "MA");
     map.put("Monaco", "MC");
     map.put("Moldavia", "MD");
     map.put("Madagascar", "MG");
     map.put("Marshall Islands", "MH");
     map.put("Macedonia", "MK");
     map.put("Mali", "ML");
     map.put("Myanmar", "MM");
     map.put("Mongolia", "MN");
     map.put("Macau", "MO");
     map.put("Northern Mariana Islands", "MP");
     map.put("Martinique (French)", "MQ");
     map.put("Mauritania", "MR");
     map.put("Montserrat", "MS");
     map.put("Malta", "MT");
     map.put("Mauritius", "MU");
     map.put("Maldives", "MV");
     map.put("Malawi", "MW");
     map.put("Mexico", "MX");
     map.put("Malaysia", "MY");
     map.put("Mozambique", "MZ");
     map.put("Namibia", "NA");
     map.put("New Caledonia (French)", "NC");
     map.put("Niger", "NE");
     map.put("Norfolk Island", "NF");
     map.put("Nigeria", "NG");
     map.put("Nicaragua", "NI");
     map.put("Netherlands", "NL");
     map.put("Norway", "NO");
     map.put("Nepal", "NP");
     map.put("Nauru", "NR");
     map.put("Neutral Zone", "NT");
     map.put("Niue", "NU");
     map.put("New Zealand", "NZ");
     map.put("Oman", "OM");
     map.put("Panama", "PA");
     map.put("Peru", "PE");
     map.put("Polynesia (French)", "PF");
     map.put("Papua New Guinea", "PG");
     map.put("Philippines", "PH");
     map.put("Pakistan", "PK");
     map.put("Poland", "PL");
     map.put("Saint Pierre And Miquelon", "PM");
     map.put("Pitcairn Island", "PN");
     map.put("Puerto Rico", "PR");
     map.put("Portugal", "PT");
     map.put("Palau", "PW");
     map.put("Paraguay", "PY");
     map.put("Qatar", "QA");
     map.put("Reunion (French)", "RE");
     map.put("Romania", "RO");
     map.put("Russian Federation", "RU");
     map.put("Rwanda", "RW");
     map.put("Saudi Arabia", "SA");
     map.put("Solomon Islands", "SB");
     map.put("Seychelles", "SC");
     map.put("Sudan", "SD");
     map.put("Sweden", "SE");
     map.put("Singapore", "SG");
     map.put("Saint Helena", "SH");
     map.put("Slovenia", "SI");
     map.put("Svalbard And Jan Mayen Islands", "SJ");
     map.put("Slovak Republic", "SK");
     map.put("Sierra Leone", "SL");
     map.put("San Marino", "SM");
     map.put("Senegal", "SN");
     map.put("Somalia", "SO");
     map.put("Suriname", "SR");
     map.put("Saint Tome (Sao Tome) And Principe", "ST");
     map.put("Former USSR", "SU");
     map.put("El Salvador", "SV");
     map.put("Syria", "SY");
     map.put("Swaziland", "SZ");
     map.put("Turks And Caicos Islands", "TC");
     map.put("Chad", "TD");
     map.put("French Southern Territories", "TF");
     map.put("Togo", "TG");
     map.put("Thailand", "TH");
     map.put("Tadjikistan", "TJ");
     map.put("Tokelau", "TK");
     map.put("Turkmenistan", "TM");
     map.put("Tunisia", "TN");
     map.put("Tonga", "TO");
     map.put("East Timor", "TP");
     map.put("Turkey", "TR");
     map.put("Trinidad And Tobago", "TT");
     map.put("Tuvalu", "TV");
     map.put("Taiwan", "TW");
     map.put("Tanzania", "TZ");
     map.put("Ukraine", "UA");
     map.put("Uganda", "UG");
     map.put("United Kingdom", "UK");
     map.put("USA Minor Outlying Islands", "UM");
     map.put("United States", "US");
     map.put("Uruguay", "UY");
     map.put("Uzbekistan", "UZ");
     map.put("Holy See (Vatican City State)", "VA");
     map.put("Saint Vincent & Grenadines", "VC");
     map.put("Venezuela", "VE");
     map.put("Virgin Islands (British)", "VG");
     map.put("Virgin Islands (USA)", "VI");
     map.put("Vietnam", "VN");
     map.put("Vanuatu", "VU");
     map.put("Wallis And Futuna Islands", "WF");
     map.put("Samoa", "WS");
     map.put("Yemen", "YE");
     map.put("Mayotte", "YT");
     map.put("Yugoslavia", "YU");
     map.put("South Africa", "ZA");
     map.put("Zambia", "ZM");
     map.put("Zaire", "ZR");
     map.put("Zimbabwe", "ZW");

    }

     public String getCode(String country){
     String countryFound = map.get(country);
     if(countryFound==null){
             countryFound="UK";
     }
     return countryFound;
     }
}