Java Utililty Methods String Encode

final byte[] bytes = s.trim().getBytes("UTF-8");
final int count = bytes.length;
final String allowed = "=,+;.'-@&/$_()!~*:"; 
final char[] buf = new char[3 * count];
int j = 0;
for (int i = 0; i < count; i++) {
    if ((bytes[i] >= 0x61 && bytes[i] <= 0x7A) || 
            (bytes[i] >= 0x41 && bytes[i] <= 0x5A) || 
...

return encode(s, "UTF-8");

if ("utf-8".equalsIgnoreCase(encoding)) {
    return encodeUTF8(s);
return encodeBytes(s.getBytes(encoding));

byte[] bytes = encode(source.getBytes(encoding), notEncoded);
return new String(bytes, "US-ASCII");

return encode(data, encode, null);

if (encoding == null) {
    return string.getBytes();
} else {
    return string.getBytes(encoding);

if (text != null) {
    if (encoding == null)
        return text.getBytes();
    try {
        return text.getBytes(encoding);
    } catch (UnsupportedEncodingException e) {
return null;

StringBuilder sb = new StringBuilder();
for (int i = 0; i < name.length(); i++) {
    char c = name.charAt(i);
    if (c != '_' && Character.isLetterOrDigit(c))
        sb.append(c);
    else {
        String esc = String.format("_%02x", (int) c);
        sb.append(esc);
...

boolean needToChange = false;
boolean wroteUnencodedChar = false;
int maxBytesPerChar = 10; 
StringBuffer out = new StringBuffer(s.length());
ByteArrayOutputStream buf = new ByteArrayOutputStream(maxBytesPerChar);
OutputStreamWriter writer;
try {
    writer = new OutputStreamWriter(buf, "UTF-8");
...

try {
    return new String(encodeToChar(s.getBytes("UTF-8"), false));
} catch (UnsupportedEncodingException e) {
    System.err.println("Base64 encoding error: " + e.getMessage());
    e.printStackTrace();
return null;