Java Utililty Methods String Encode

try {
    boolean escaped = false;
    StringBuilder out = new StringBuilder(s.length());
    ByteArrayOutputStream buf = new ByteArrayOutputStream();
    OutputStreamWriter w = new OutputStreamWriter(buf, "UTF-8");
    for (int i = 0; i < s.length(); i++) {
        int c = s.charAt(i);
        if (c < 128 && c != ' ') {
...

Encode a given string.

if (s == null) {
    throw new IllegalArgumentException("String must not be null");
if (enc == null) {
    enc = "UTF-8";
ByteArrayInputStream bIn;
try {
...

int length = s.length();
int start = 0;
int i = 0;
StringBuilder result = new StringBuilder(length);
while (true) {
    while ((i < length) && isSafe(s.charAt(i))) {
        i++;
    result.append(s.substring(start, i));
    if (i >= length) {
        return result.toString();
    } else if (s.charAt(i) == ' ') {
        result.append('+');
        i++;
    } else {
        start = i;
        char c;
        while ((i < length) && ((c = s.charAt(i)) != ' ') && !isSafe(c)) {
            i++;
        String unsafe = s.substring(start, i);
        byte[] bytes = unsafe.getBytes(encoding);
        for (int j = 0; j < bytes.length; j++) {
            result.append('%');
            int val = bytes[j];
            result.append(hex.charAt((val & 0xf0) >> 4));
            result.append(hex.charAt(val & 0x0f));
    start = i;

try {
    return new String(source.getBytes(charsetFrom), charsetTo);
} catch (UnsupportedEncodingException e) {
    e.printStackTrace();
return source;

String genDelims = ":/?#[]@";
String subDelims = "!$&'()*+,;=";
String unreserved = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-._~";
String okChars = genDelims + subDelims + unreserved + "%"; 
String filesep = System.getProperty("file.separator");
if ("\\".equals(filesep)) {
    src = src.replaceAll("\\\\", "/");
String encoded = "";
try {
    byte[] bytes = src.getBytes("UTF-8");
    for (int pos = 0; pos < bytes.length; pos++) {
        if (okChars.indexOf(bytes[pos]) >= 0) {
            encoded += (char) bytes[pos];
        } else {
            encoded += String.format("%%%02X", bytes[pos]);
} catch (UnsupportedEncodingException uee) {
return encoded;

if (src == null) {
    return null;
try {
    return src.getBytes(charset);
} catch (UnsupportedEncodingException e) {
    return src.getBytes();

byte[] b = null;
String s = null;
try {
    b = str.getBytes("utf-8");
} catch (UnsupportedEncodingException e) {
    e.printStackTrace();
if (b != null) {
...

for (int i = start; i < end; i++) {
    char ch = str.charAt(i);
    String special = getSpecial(ch);
    if (special != null) {
        writer.write(special);
    } else {
        if ((ch & 0xff) != 0) {
            writer.write("&#"); 
...

try {
    return new ByteArrayInputStream(text.getBytes(charset));
} catch (UnsupportedEncodingException e) {
    e.printStackTrace();
    throwCoreException(e);
return null;

return MimeUtility.encodeText(text, encoding, "Q");