Appendix-Hexadecimal conversion in Java and PHP

Appendix

Java String to Hexadecimal

public static String strToHex(String str) {
    String st = "";
    try {
        byte[] by = str.getBytes("utf8");
        for (int i = 0; i < by.length; i++) {
            String strs = Integer.toHexString(by[i]);
            if (strs.length() > 2){
                strs = strs.substring(strs.length() - 2);
            } else if (strs.length() == 1) {
                //Add padding for hexadecimal 00~0F
                strs = String.format("%02x", by[i]);
            }
            st += strs;
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return st;
}

PHP String to Hexadecimal

bin2hex($utf8Str);