String texto_filtrado = original.replaceAll("\s+$", "");

String texto_filtrado = original.replaceAll("^\s+", "");

public static String ltrim(String s) {
        int i = 0;
        while (i < s.length() && Character.isWhitespace(s.charAt(i))) {
            i++;
        }
        return s.substring(i);
    }

    public static String rtrim(String s) {
       int i = s.length()-1;
       while (i > 0 && Character.isWhitespace(s.charAt(i))) {
            i--;
       }
       return s.substring(0,i+1);
    }

String semEspacosOuTabulacosAEsquerda = StringUtils.stripStart(original, " t");

String semEspacosOuTabulacoesADireita = StringUtils.stripEnd(original, " t");

public String trim() {
    int len = value.length;
    int st = 0;
    char[] val = value;    /* avoid getfield opcode */

    while ((st < len) && (val[st] <= ' ')) {
        st++;
    }
    while ((st < len) && (val[len - 1] <= ' ')) {
        len--;
    }
    return ((st > 0) || (len < value.length)) ? substring(st, len) : this;
}

public static String rtrim(String toTrim) {
    char[] val = toTrim.toCharArray();
    int len = val.length;

    while (len > 0 && val[len - 1] <= ' ') {
        len--;
    }
    return len < val.length ? toTrim.substring(0, len) : toTrim;
}

public static String ltrim(String toTrim) {
    int st = 0;
    char[] val = toTrim.toCharArray();
    int len = val.length;

    while (st < len && val[st] <= ' ') {
        st++;
    }
    return st > 0 ? toTrim.substring(st, len) : toTrim;
}