import org.springframework.stereotype.Component;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;

@Component
public class CookiesUtil {

    /**
     * 根據(jù)名字獲取cookie
     *
     * @param request
     * @param name    cookie名字
     * @return
     */
    public static Cookie getCookieByName(HttpServletRequest request, String name) {
        Map<String, Cookie> cookieMap = ReadCookieMap(request);
        if (cookieMap.containsKey(name)) {
            Cookie cookie = (Cookie) cookieMap.get(name);
            return cookie;
        } else {
            return null;
        }
    }

    /**
     * 將cookie封裝到Map里面
     *
     * @param request
     * @return
     */
    private static Map<String, Cookie> ReadCookieMap(HttpServletRequest request) {
        Map<String, Cookie> cookieMap = new HashMap<String, Cookie>();
        Cookie[] cookies = request.getCookies();
        if (null != cookies) {
            for (Cookie cookie : cookies) {
                cookieMap.put(cookie.getName(), cookie);
            }
        }
        return cookieMap;
    }

    /**
     * 保存Cookies
     *
     * @param response servlet請(qǐng)求
     * @param value    保存值
     * @author jxf
     */
    public static HttpServletResponse setCookie(HttpServletResponse response, String name, String value, int time) {
        // new一個(gè)Cookie對(duì)象,鍵值對(duì)為參數(shù)
        Cookie cookie = new Cookie(name, value);
        // tomcat下多應(yīng)用共享
        cookie.setPath("/");
        // 如果cookie的值中含有中文時(shí)，需要對(duì)cookie進(jìn)行編碼，不然會(huì)產(chǎn)生亂碼
        try {
            URLEncoder.encode(value, "utf-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        cookie.setMaxAge(time);
        // 將Cookie添加到Response中,使之生效
        response.addCookie(cookie); // addCookie后，如果已經(jīng)存在相同名字的cookie，則最新的覆蓋舊的cookie
        return response;
    }
}