String CookieName=null;

Cookie[] LetterNum=request.getCookies();
for(int i=0; i<LetterNum.length; i++){
if(LetterNum[i].getName().equals("pagelist")){
    LetterNum[i].setValue(URLEncoder.encode(letter));
    out.println(URLEncoder.encode(letter));
}
else{
    Cookie LetterList=new Cookie("pagelist",URLEncoder.encode(letter));
    LetterList.setPath("../contents/");
    response.addCookie(LetterList);
    out.println(URLEncoder.encode(letter));
}

String LetterList=null;
Cookie[] LetterNum=request.getCookies();
for(int i=0; i<LetterNum.length; i++){
    if(LetterNum[i].getName().equals("pagelist")){
        LetterList=URLDecoder.decode(LetterNum[i].getValue());

    }else{
        out.println(URLDecoder.decode(LetterNum[i].getValue())+"   ");
        }
}