JAVAWEB使用保存cookie、刪除cookie、獲取cookie工具類

 

 

 

 

 

package com.test;

import org.apache.commons.lang.StringUtils;
import org.springframework.util.Assert;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Cookie 輔助類
 */
public class CookieUtils {


    /**
     * 根據cookie名稱獲得cookie
     * @param request
     * @param name  cookie的名稱
     * @return
     */
    public static Cookie getCookie(HttpServletRequest request, String name) {
        Assert.notNull(request);
        Cookie[] cookies = request.getCookies();
        if (cookies != null && cookies.length > 0) {
            for (Cookie c : cookies) {
                if (c.getName().equals(name)) {
                    return c;
                }
            }
        }
        return null;
    }


    /**
     * 保存cookie 保存在根目錄下
     * @param request
     * @param response
     * @param name cookie名稱
     * @param value  cookie的值
     * @param expiry  過期時間（可以為空,單位：秒）
     * @param domain  域名（可以為空）
     * @return
     */
    public static Cookie addCookie(HttpServletRequest request,
                                   HttpServletResponse response, String name, String value,
                                   Integer expiry, String domain) {
        Cookie cookie = new Cookie(name, value);
        if (expiry != null) {
            cookie.setMaxAge(expiry);
        }
        if (StringUtils.isNotBlank(domain)) {
            cookie.setDomain(domain);
        }
        String ctx = request.getContextPath();
        cookie.setPath(StringUtils.isBlank(ctx) ? "/" : ctx);
        response.addCookie(cookie);
        return cookie;
    }
    

    /**
     * 清除cookie
     * @param request
     * @param response
     * @param name cookie名稱
     * @param domain
     */
    public static void cancleCookie(HttpServletRequest request,
                                    HttpServletResponse response, String name, String domain) {
        Cookie cookie = new Cookie(name, "");
        cookie.setMaxAge(0);
        String ctx = request.getContextPath();
        cookie.setPath(StringUtils.isBlank(ctx) ? "/" : ctx);
        if (StringUtils.isNotBlank(domain)) {
            cookie.setDomain(domain);
        }
        response.addCookie(cookie);
    }
}