[Java] Chuyển tiếng Việt tổ hợp sang dựng sẵn

compound-to-unicode.java

public static String compound2Unicode(String str) {
    str = str.replaceAll("\u0065\u0309", "\u1EBB"); //ẻ
    str = str.replaceAll("\u0065\u0301", "\u00E9"); //é
    str = str.replaceAll("\u0065\u0300", "\u00E8"); //è
    str = str.replaceAll("\u0065\u0323", "\u1EB9"); //ẹ
    str = str.replaceAll("\u0065\u0303", "\u1EBD"); //ẽ
    str = str.replaceAll("\u00EA\u0309", "\u1EC3"); //ể
    str = str.replaceAll("\u00EA\u0301", "\u1EBF"); //ế
    str = str.replaceAll("\u00EA\u0300", "\u1EC1"); //ề
    str = str.replaceAll("\u00EA\u0323", "\u1EC7"); //ệ
    str = str.replaceAll("\u00EA\u0303", "\u1EC5"); //ễ
    str = str.replaceAll("\u0079\u0309", "\u1EF7"); //ỷ
    str = str.replaceAll("\u0079\u0301", "\u00FD"); //ý
    str = str.replaceAll("\u0079\u0300", "\u1EF3"); //ỳ
    str = str.replaceAll("\u0079\u0323", "\u1EF5"); //ỵ
    str = str.replaceAll("\u0079\u0303", "\u1EF9"); //ỹ
    str = str.replaceAll("\u0075\u0309", "\u1EE7"); //ủ
    str = str.replaceAll("\u0075\u0301", "\u00FA"); //ú
    str = str.replaceAll("\u0075\u0300", "\u00F9"); //ù
    str = str.replaceAll("\u0075\u0323", "\u1EE5"); //ụ
    str = str.replaceAll("\u0075\u0303", "\u0169"); //ũ
    str = str.replaceAll("\u01B0\u0309", "\u1EED"); //ử
    str = str.replaceAll("\u01B0\u0301", "\u1EE9"); //ứ
    str = str.replaceAll("\u01B0\u0300", "\u1EEB"); //ừ
    str = str.replaceAll("\u01B0\u0323", "\u1EF1"); //ự
    str = str.replaceAll("\u01B0\u0303", "\u1EEF"); //ữ
    str = str.replaceAll("\u0069\u0309", "\u1EC9"); //ỉ
    str = str.replaceAll("\u0069\u0301", "\u00ED"); //í
    str = str.replaceAll("\u0069\u0300", "\u00EC"); //ì
    str = str.replaceAll("\u0069\u0323", "\u1ECB"); //ị
    str = str.replaceAll("\u0069\u0303", "\u0129"); //ĩ
    str = str.replaceAll("\u006F\u0309", "\u1ECF"); //ỏ
    str = str.replaceAll("\u006F\u0301", "\u00F3"); //ó
    str = str.replaceAll("\u006F\u0300", "\u00F2"); //ò
    str = str.replaceAll("\u006F\u0323", "\u1ECD"); //ọ
    str = str.replaceAll("\u006F\u0303", "\u00F5"); //õ
    str = str.replaceAll("\u01A1\u0309", "\u1EDF"); //ở
    str = str.replaceAll("\u01A1\u0301", "\u1EDB"); //ớ
    str = str.replaceAll("\u01A1\u0300", "\u1EDD"); //ờ
    str = str.replaceAll("\u01A1\u0323", "\u1EE3"); //ợ
    str = str.replaceAll("\u01A1\u0303", "\u1EE1"); //ỡ
    str = str.replaceAll("\u00F4\u0309", "\u1ED5"); //ổ
    str = str.replaceAll("\u00F4\u0301", "\u1ED1"); //ố
    str = str.replaceAll("\u00F4\u0300", "\u1ED3"); //ồ
    str = str.replaceAll("\u00F4\u0323", "\u1ED9"); //ộ
    str = str.replaceAll("\u00F4\u0303", "\u1ED7"); //ỗ
    str = str.replaceAll("\u0061\u0309", "\u1EA3"); //ả
    str = str.replaceAll("\u0061\u0301", "\u00E1"); //á
    str = str.replaceAll("\u0061\u0300", "\u00E0"); //à
    str = str.replaceAll("\u0061\u0323", "\u1EA1"); //ạ
    str = str.replaceAll("\u0061\u0303", "\u00E3"); //ã
    str = str.replaceAll("\u0103\u0309", "\u1EB3"); //ẳ
    str = str.replaceAll("\u0103\u0301", "\u1EAF"); //ắ
    str = str.replaceAll("\u0103\u0300", "\u1EB1"); //ằ
    str = str.replaceAll("\u0103\u0323", "\u1EB7"); //ặ
    str = str.replaceAll("\u0103\u0303", "\u1EB5"); //ẵ
    str = str.replaceAll("\u00E2\u0309", "\u1EA9"); //ẩ
    str = str.replaceAll("\u00E2\u0301", "\u1EA5"); //ấ
    str = str.replaceAll("\u00E2\u0300", "\u1EA7"); //ầ
    str = str.replaceAll("\u00E2\u0323", "\u1EAD"); //ậ
    str = str.replaceAll("\u00E2\u0303", "\u1EAB"); //ẫ
    str = str.replaceAll("\u0045\u0309", "\u1EBA"); //Ẻ
    str = str.replaceAll("\u0045\u0301", "\u00C9"); //É
    str = str.replaceAll("\u0045\u0300", "\u00C8"); //È
    str = str.replaceAll("\u0045\u0323", "\u1EB8"); //Ẹ
    str = str.replaceAll("\u0045\u0303", "\u1EBC"); //Ẽ
    str = str.replaceAll("\u00CA\u0309", "\u1EC2"); //Ể
    str = str.replaceAll("\u00CA\u0301", "\u1EBE"); //Ế
    str = str.replaceAll("\u00CA\u0300", "\u1EC0"); //Ề
    str = str.replaceAll("\u00CA\u0323", "\u1EC6"); //Ệ
    str = str.replaceAll("\u00CA\u0303", "\u1EC4"); //Ễ
    str = str.replaceAll("\u0059\u0309", "\u1EF6"); //Ỷ
    str = str.replaceAll("\u0059\u0301", "\u00DD"); //Ý
    str = str.replaceAll("\u0059\u0300", "\u1EF2"); //Ỳ
    str = str.replaceAll("\u0059\u0323", "\u1EF4"); //Ỵ
    str = str.replaceAll("\u0059\u0303", "\u1EF8"); //Ỹ
    str = str.replaceAll("\u0055\u0309", "\u1EE6"); //Ủ
    str = str.replaceAll("\u0055\u0301", "\u00DA"); //Ú
    str = str.replaceAll("\u0055\u0300", "\u00D9"); //Ù
    str = str.replaceAll("\u0055\u0323", "\u1EE4"); //Ụ
    str = str.replaceAll("\u0055\u0303", "\u0168"); //Ũ
    str = str.replaceAll("\u01AF\u0309", "\u1EEC"); //Ử
    str = str.replaceAll("\u01AF\u0301", "\u1EE8"); //Ứ
    str = str.replaceAll("\u01AF\u0300", "\u1EEA"); //Ừ
    str = str.replaceAll("\u01AF\u0323", "\u1EF0"); //Ự
    str = str.replaceAll("\u01AF\u0303", "\u1EEE"); //Ữ
    str = str.replaceAll("\u0049\u0309", "\u1EC8"); //Ỉ
    str = str.replaceAll("\u0049\u0301", "\u00CD"); //Í
    str = str.replaceAll("\u0049\u0300", "\u00CC"); //Ì
    str = str.replaceAll("\u0049\u0323", "\u1ECA"); //Ị
    str = str.replaceAll("\u0049\u0303", "\u0128"); //Ĩ
    str = str.replaceAll("\u004F\u0309", "\u1ECE"); //Ỏ
    str = str.replaceAll("\u004F\u0301", "\u00D3"); //Ó
    str = str.replaceAll("\u004F\u0300", "\u00D2"); //Ò
    str = str.replaceAll("\u004F\u0323", "\u1ECC"); //Ọ
    str = str.replaceAll("\u004F\u0303", "\u00D5"); //Õ
    str = str.replaceAll("\u01A0\u0309", "\u1EDE"); //Ở
    str = str.replaceAll("\u01A0\u0301", "\u1EDA"); //Ớ
    str = str.replaceAll("\u01A0\u0300", "\u1EDC"); //Ờ
    str = str.replaceAll("\u01A0\u0323", "\u1EE2"); //Ợ
    str = str.replaceAll("\u01A0\u0303", "\u1EE0"); //Ỡ
    str = str.replaceAll("\u00D4\u0309", "\u1ED4"); //Ổ
    str = str.replaceAll("\u00D4\u0301", "\u1ED0"); //Ố
    str = str.replaceAll("\u00D4\u0300", "\u1ED2"); //Ồ
    str = str.replaceAll("\u00D4\u0323", "\u1ED8"); //Ộ
    str = str.replaceAll("\u00D4\u0303", "\u1ED6"); //Ỗ
    str = str.replaceAll("\u0041\u0309", "\u1EA2"); //Ả
    str = str.replaceAll("\u0041\u0301", "\u00C1"); //Á
    str = str.replaceAll("\u0041\u0300", "\u00C0"); //À
    str = str.replaceAll("\u0041\u0323", "\u1EA0"); //Ạ
    str = str.replaceAll("\u0041\u0303", "\u00C3"); //Ã
    str = str.replaceAll("\u0102\u0309", "\u1EB2"); //Ẳ
    str = str.replaceAll("\u0102\u0301", "\u1EAE"); //Ắ
    str = str.replaceAll("\u0102\u0300", "\u1EB0"); //Ằ
    str = str.replaceAll("\u0102\u0323", "\u1EB6"); //Ặ
    str = str.replaceAll("\u0102\u0303", "\u1EB4"); //Ẵ
    str = str.replaceAll("\u00C2\u0309", "\u1EA8"); //Ẩ
    str = str.replaceAll("\u00C2\u0301", "\u1EA4"); //Ấ
    str = str.replaceAll("\u00C2\u0300", "\u1EA6"); //Ầ
    str = str.replaceAll("\u00C2\u0323", "\u1EAC"); //Ậ
    str = str.replaceAll("\u00C2\u0303", "\u1EAA"); //Ẫ
    return str;
}

Các bác cứ thích tạo lại cái bánh xe mà không biết người ta đã tạo ra phi thuyền rồi: https://docs.oracle.com/javase/tutorial/i18n/text/normalizerapi.html
Chỉ cần một phát Normalization Form C là xong, chả cần phải lập bảng như thế này.

@Meigyoku-Thmn Nhiều khi người ta không muốn lắp bánh xe ô tô vào xe đạp nên muốn tạo ra bánh xe đạp bạn ạ. Và thêm nữa một số java profile nó không hỗ trợ Normalization.

php cho anh em nào cần
https://gist.github.com/hieuhiti/52438445fceb9d3c10caf1d78cce6d1e