CookieUtil.java

package verifycode.util;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.HashMap;
import java.util.Map;

/**
 * @author fdse
 */
public class CookieUtil {

    private CookieUtil() {
        throw new IllegalStateException("Utility class");
    }

    public static void addCookie(HttpServletResponse response, String name, String value, int maxAge){
        Cookie cookie = new Cookie(name,value);
        // against Cross-Site Scripting (XSS) attacks.
        cookie.setHttpOnly(true);
        cookie.setPath("/");
        if(maxAge>0) {
            cookie.setMaxAge(maxAge);
        }
        response.addCookie(cookie);
    }

    public static Cookie getCookieByName(HttpServletRequest request, String name){
        Map<String,Cookie> cookieMap = readCookieMap(request);
        return cookieMap.getOrDefault(name, null);
    }

    private static Map<String,Cookie> readCookieMap(HttpServletRequest request){
        Map<String,Cookie> cookieMap = new HashMap<>();
        Cookie[] cookies = request.getCookies();
        if(null!=cookies){
            for(Cookie cookie : cookies){
                cookieMap.put(cookie.getName(), cookie);
            }
        }
        return cookieMap;
    }
}