根据语言的不同，这些可能不被认为是重音(改变字母的发音)，而是变音符符号

https://en.wikipedia.org/wiki/Diacritic#Languages_with_letters_containing_diacritics

“波斯尼亚语和克罗地亚语都有符号“č”、“ovic”、“đ”、“š”和“ž”，这些符号被认为是单独的字母，在字典和其他按字母顺序排列单词的语境中都是这样列出的。”

删除它们可能会从本质上改变单词的意思，或者将字母变成完全不同的字母。

@David Conrad solution is the fastest I tried using the Normalizer, but it does have a bug. It basically strips characters which are not accents, for example Chinese characters and other letters like æ, are all stripped. The characters that we want to strip are non spacing marks, characters which don't take up extra width in the final string. These zero width characters basically end up combined in some other character. If you can see them isolated as a character, for example like this `, my guess is that it's combined with the space character.

public static String flattenToAscii(String string) {
    char[] out = new char[string.length()];
    String norm = Normalizer.normalize(string, Normalizer.Form.NFD);

    int j = 0;
    for (int i = 0, n = norm.length(); i < n; ++i) {
        char c = norm.charAt(i);
        int type = Character.getType(c);

        //Log.d(TAG,""+c);
        //by Ricardo, modified the character check for accents, ref: http://stackoverflow.com/a/5697575/689223
        if (type != Character.NON_SPACING_MARK){
            out[j] = c;
            j++;
        }
    }
    //Log.d(TAG,"normalized string:"+norm+"/"+new String(out));
    return new String(out);
}

我也遇到过与字符串相等性检查相关的相同问题，比较字符串中的一个 ASCII字符码128-255。

i.e., Non-breaking space - [Hex - A0] Space [Hex - 20]. To show Non-breaking space over HTML. I have used the following spacing entities. Their character and its bytes are like &emsp is very wide space[ ]{-30, -128, -125}, &ensp is somewhat wide space[ ]{-30, -128, -126}, &thinsp is narrow space[ ]{32} , Non HTML Space {} String s1 = "My Sample Space Data", s2 = "My Sample Space Data"; System.out.format("S1: %s\n", java.util.Arrays.toString(s1.getBytes())); System.out.format("S2: %s\n", java.util.Arrays.toString(s2.getBytes())); Output in Bytes: S1: [77, 121, 32, 83, 97, 109, 112, 108, 101, 32, 83, 112, 97, 99, 101, 32, 68, 97, 116, 97] S2: [77, 121, -30, -128, -125, 83, 97, 109, 112, 108, 101, -30, -128, -125, 83, 112, 97, 99, 101, -30, -128, -125, 68, 97, 116, 97]

对于不同的空格及其字节码使用下面的代码:wiki for List_of_Unicode_characters

String spacing_entities = "very wide space,narrow space,regular space,invisible separator";
System.out.println("Space String :"+ spacing_entities);
byte[] byteArray = 
    // spacing_entities.getBytes( Charset.forName("UTF-8") );
    // Charset.forName("UTF-8").encode( s2 ).array();
    {-30, -128, -125, 44, -30, -128, -126, 44, 32, 44, -62, -96};
System.out.println("Bytes:"+ Arrays.toString( byteArray ) );
try {
    System.out.format("Bytes to String[%S] \n ", new String(byteArray, "UTF-8"));
} catch (UnsupportedEncodingException e) {
    e.printStackTrace();
}

➩ ASCII transliterations of Unicode string for Java. unidecode String initials = Unidecode.decode( s2 ); ➩ using Guava: Google Core Libraries for Java. String replaceFrom = CharMatcher.WHITESPACE.replaceFrom( s2, " " ); For URL encode for the space use Guava laibrary. String encodedString = UrlEscapers.urlFragmentEscaper().escape(inputString); ➩ To overcome this problem used String.replaceAll() with some RegularExpression. // \p{Z} or \p{Separator}: any kind of whitespace or invisible separator. s2 = s2.replaceAll("\\p{Zs}", " "); s2 = s2.replaceAll("[^\\p{ASCII}]", " "); s2 = s2.replaceAll(" ", " "); ➩ Using java.text.Normalizer.Form. This enum provides constants of the four Unicode normalization forms that are described in Unicode Standard Annex #15 — Unicode Normalization Forms and two methods to access them. s2 = Normalizer.normalize(s2, Normalizer.Form.NFKC);

测试字符串和输出的不同方法，如➩Unidecode, Normalizer, StringUtils。

String strUni = "Tĥïŝ ĩš â fůňķŷ Šťŕĭńġ Æ,Ø,Ð,ß";

// This is a funky String AE,O,D,ss
String initials = Unidecode.decode( strUni );

// Following Produce this o/p: Tĥïŝ ĩš â fůňķŷ Šťŕĭńġ Æ,Ø,Ð,ß
String temp = Normalizer.normalize(strUni, Normalizer.Form.NFD);
Pattern pattern = Pattern.compile("\\p{InCombiningDiacriticalMarks}+");
temp = pattern.matcher(temp).replaceAll("");

String input = org.apache.commons.lang3.StringUtils.stripAccents( strUni );

使用unidcode是最好的选择，我的最终代码如下所示。

public static void main(String[] args) {
    String s1 = "My Sample Space Data", s2 = "My Sample Space Data";
    String initials = Unidecode.decode( s2 );
    if( s1.equals(s2)) { //[ , ] %A0 - %2C - %20 « http://www.ascii-code.com/
        System.out.println("Equal Unicode Strings");
    } else if( s1.equals( initials ) ) {
        System.out.println("Equal Non Unicode Strings");
    } else {
        System.out.println("Not Equal");
    }

}

面对同样的问题，这里是使用Kotlin扩展的解决方案

   val String.stripAccents: String
    get() = Regex("\\p{InCombiningDiacriticalMarks}+")
        .replace(
            Normalizer.normalize(this, Normalizer.Form.NFD),
            ""
        )

使用

val textWithoutAccents = "some accented string".stripAccents

如果你没有库，使用regex和Normalizer的最好方法之一是:

    public String flattenToAscii(String s) {
                if(s == null || s.trim().length() == 0)
                        return "";
                return Normalizer.normalize(s, Normalizer.Form.NFD).replaceAll("[\u0300-\u036F]", "");
}

这比replaceAll("[^\p{ASCII}]"， ""))更有效，而且如果你不需要变音符符(就像你的例子一样)。

否则，您必须使用p{ASCII}模式。

的问候。

我认为最好的解决方案是将每个char转换为HEX，并用另一个HEX替换它。因为有两种Unicode类型:

Composite Unicode
Precomposed Unicode

例如，Composite Unicode编写的“Ồ”不同于precompose Unicode编写的“Ồ”。您可以复制我的示例字符并转换它们以查看差异。

In Composite Unicode, "Ồ" is combined from 2 char: Ô (U+00d4) and ̀ (U+0300)
In Precomposed Unicode, "Ồ" is single char (U+1ED2)

我为一些银行开发了这个功能，以便在将信息发送到核心银行(通常不支持Unicode)之前转换信息，当最终用户使用多种Unicode类型输入数据时，就会遇到这个问题。所以我认为，转换为HEX并替换它是最可靠的方法。