Java Utililty Methods UTF8

List of utility methods to do UTF8

  1. HOME
  2. Java
  3. U
  4. UTF8

Description

The list of methods to do UTF8 are organized into topic(s).

Method

intutf8StringLength(final CharSequence sequence)
utf String Length 
int count = 0;
for (int i = 0, len = sequence.length(); i < len; i++) {
    char ch = sequence.charAt(i);
    if (ch <= 0x7F) {
        count++;
    } else if (ch <= 0x7FF) {
        count += 2;
    } else if (Character.isHighSurrogate(ch)) {
...
intutf8StringSizeInBytes(String s)
Compute the size in bytes of the given string encoded as utf8. 
int res = 0;
for (int i = 0; i < s.length(); ++i) {
    char c = s.charAt(i);
    int codepoint = c;
    if (isSurrogate(c)) {
        i++;
        char c2 = s.charAt(i);
        codepoint = Character.toCodePoint(c, c2);
...
byte[]utf8StringToByteArray(String dataString)
Creates a byte array for an UTF-8 encoded string. 
if (dataString == null) {
    return null;
try {
    return dataString.getBytes("utf-8");
} catch (Exception ex) {
return null;
...
byte[]utf8StringToBytes(String string)
Turn a UTF-8 encoded string into an array of bytes 
return asBytes(string, UTF_8);
Stringutf8ToString(byte[] data)
Decodes the specified UTF-8 sequence to a string. 
return utf8ToString(data, 0, data.length);
Stringutf8URLDecode(String input)
Decodes the URL encoded input string, in UTF-8. 
try {
    return decode(input, UTF_8.displayName());
} catch (UnsupportedEncodingException e) {
    return "";
Stringutf8urldecode(String text)
utfurldecode 
StringBuilder result = new StringBuilder();
int p;
if (text != null && text.length() > 0) {
    text = text.toLowerCase();
    p = text.indexOf("%e");
    if (p == -1) {
        return text;
    while (p != -1) {
        result.append(text, 0, p);
        text = text.substring(p);
        if (Objects.equals(text, "") || text.length() < 9) {
            return result.toString();
        result.append(codetoword(text.substring(0, 9)));
        text = text.substring(9);
        p = text.indexOf("%e");
return result + text;
StringUtf8URLencode(String text)
Utf UR Lencode 
StringBuffer result = new StringBuffer();
for (int i = 0; i < text.length(); i++) {
    char c = text.charAt(i);
    if (c >= 0 && c <= 255) {
        result.append(c);
    } else {
        byte[] b = new byte[0];
        try {
...