关于CookieUtile的相关代码_cookieutil 作用-优快云博客

本文链接：https://blog.youkuaiyun.com/sun5769675/article/details/50314009

本文详细介绍了CookieUtile类中的关键方法，包括获取、删除、设置Cookie的实现细节及使用场景，提供了完整的代码示例，适用于理解HTTP请求中Cookie的管理。

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关于CookieUtile的相关代码

public class CookieUtil{

    /**
     * 根据name获得cookie
     * 
     * @param request
     * @param name
     * @return
     */
    public static Cookie getCookie(HttpServletRequest request,String name){
        Cookie cookies[] = request.getCookies();
        if (cookies == null || name == null || name.length() == 0){
            return null;
        }
        for (int i = 0; i < cookies.length; i++){
            if (name.equals(cookies[i].getName())
            /* && request.getServerName().equals(cookies[i].getDomain()) */){
                return cookies[i];
            }
        }
        return null;
    }

    /**
     * 根据cookie对象移除cookie
     * 
     * @param request
     * @param response
     * @param cookie
     */
    public static void deleteCookie(HttpServletRequest request,HttpServletResponse response,Cookie cookie){
        if (cookie != null){
            cookie.setPath(getPath(request));
            cookie.setValue("");
            cookie.setMaxAge(0);
            response.addCookie(cookie);
        }
    }

    /**
     * 根据cookie的name删除
     * 
     * @param request
     * @param response
     * @param cookieName
     */
    public static void deleteCookie(HttpServletRequest request,HttpServletResponse response,String cookieName){
        Cookie cookie = new Cookie(cookieName, "");
        deleteCookie(request, response, cookie);
    }

    /**
     * 通过name和value产生一个生命周期为2592000秒的cookie
     * 
     * @param request
     * @param response
     * @param name
     *            键
     * @param value
     *            值
     */
    public static void setCookie(HttpServletRequest request,HttpServletResponse response,String name,String value){
        setCookie(request, response, name, value, 0x278d00);
    }

    /**
     * 通过name和value产生一个生命周期为maxAge秒的cookie
     * 
     * @param request
     * @param response
     * @param name
     *            键
     * @param value
     *            值
     * @param maxAge
     *            生命周期
     */
    public static void setCookie(HttpServletRequest request,HttpServletResponse response,String name,String value,int maxAge){
        Cookie cookie = new Cookie(name, value == null ? "" : value);
        cookie.setMaxAge(maxAge);
        cookie.setPath(getPath(request));
        response.addCookie(cookie);
    }

    private static StringBuffer generateCookieStringInTomcat(final Cookie cookie,final boolean httpOnly){
        final StringBuffer sb = new StringBuffer();
        // web application code can receive a IllegalArgumentException
        // from the appendCookieValue invokation
        if (SecurityUtil.isPackageProtectionEnabled()){
            AccessController.doPrivileged(new PrivilegedAction(){

                public Object run(){
                    ServerCookie.appendCookieValue(
                            sb,
                            cookie.getVersion(),
                            cookie.getName(),
                            cookie.getValue(),
                            cookie.getPath(),
                            cookie.getDomain(),
                            cookie.getComment(),
                            cookie.getMaxAge(),
                            cookie.getSecure(),
                            httpOnly);
                    return null;
                }
            });
        }else{
            ServerCookie.appendCookieValue(
                    sb,
                    cookie.getVersion(),
                    cookie.getName(),
                    cookie.getValue(),
                    cookie.getPath(),
                    cookie.getDomain(),
                    cookie.getComment(),
                    cookie.getMaxAge(),
                    cookie.getSecure(),
                    httpOnly);
        }
        return sb;
    }

    /**
     * setCookie的增强版
     * 
     * @param request
     * @param response
     * @param name
     *            键
     * @param value
     *            值
     * @param maxAge
     *            生命周期
     */
    public static void setCookieHttp(HttpServletRequest request,HttpServletResponse response,String name,String value,int maxAge){
        StringBuffer cookie = generateCookieStringInTomcat(new TimeIntervalCookie(name, value, maxAge), true);

        response.addHeader("Set-Cookie", cookie.toString());
    }

    private static String getPath(HttpServletRequest request){
        String path = request.getContextPath();
        return (path == null || path.length() == 0) ? "/" : path;
    }

}