css check

public final class CssCheck{

    //hex values for 'dangerous' chars
    public static final String kLESS_THEN = "3C";
    public static final String kGT_THEN = "3E";
    public static final String kLEFT_PREN = "28";
    public static final String kRIGHT_PREN = "29";
    public static final String kPOUND = "23";
    public static final String kAMPERSAND = "26";
    public static final String kPERCENT = "25";
    public static final String kFOWARD_SLASH = "2F";


    public static String filter(String ascii) {
        if (ascii==null)
            return (null);
        StringBuffer result = new StringBuffer(ascii.length());

        for (int i = 0; i < ascii.length(); i++) {
            boolean ok = true;
            
            if(Integer.toHexString(ascii.charAt(i)).equalsIgnoreCase(kLESS_THEN))
                ok=false;
            else if(Integer.toHexString(ascii.charAt(i)).equalsIgnoreCase(kGT_THEN))
                ok=false;
            else if(Integer.toHexString(ascii.charAt(i)).equalsIgnoreCase(kLEFT_PREN))
                ok=false;
            else if(Integer.toHexString(ascii.charAt(i)).equalsIgnoreCase(kRIGHT_PREN))
                ok=false;
            else if(Integer.toHexString(ascii.charAt(i)).equalsIgnoreCase(kPOUND))
                ok=false;
            else if(Integer.toHexString(ascii.charAt(i)).equalsIgnoreCase(kAMPERSAND))
                ok=false;
            else if(Integer.toHexString(ascii.charAt(i)).equalsIgnoreCase(kPERCENT))
                ok=false;
            else if(Integer.toHexString(ascii.charAt(i)).equalsIgnoreCase(kFOWARD_SLASH))
                ok=false;

            if(ok)
                result.append(ascii.charAt(i));
        }
        return (result.toString().trim());
    }
}



Here is the above java class. 
CssCheck.java