session和cookie的使用

private String getHeaders(HttpServletRequest request) {    Enumeration en = request.getHeaderNames();    String pasession = "";    while (en.hasMoreElements()) {        String key = en.nextElement().toString();        String value = request.getHeader(key);        if (StringUtils.isNotEmpty(value) && (value.indexOf("PASESSION=") != -1 || value.indexOf("pasession=") != -1)) {            int beginIndex = value.indexOf("PASESSION=");            if (beginIndex < 0) {                beginIndex = value.indexOf("pasession=") + 10;            } else {                beginIndex = beginIndex + 10;            }            String subStr = value.substring(beginIndex);            int endIndex = subStr.indexOf(";");            if (endIndex < 0) {                pasession = subStr;            } else {                pasession = subStr.substring(0, endIndex);            }            break;        }    }    return pasession;}

private String getPasession(HttpServletRequest request) {    Cookie[] cookies = request.getCookies();    String PASESSION = "";    if (null != cookies) {        for (int i = 0; i < cookies.length; i++) {            if ((cookies[i].getName()).equals("PASESSION")) {                PASESSION = cookies[i].getValue();            }        }    }    return PASESSION;}

public class CookieUtils {

    public static Cookie getCookieByName(Cookie[] cookies, String name) {        Map<String, Cookie> cookieMap = ReadCookieMap(cookies);        if (cookieMap.containsKey(name)) {            Cookie cookie = cookieMap.get(name);            return cookie;        } else {            return null;        }    }

    /**     * 将cookie封装到Map里面     *     * @return     */    private static Map<String, Cookie> ReadCookieMap(Cookie[] cookies) {        Map<String, Cookie> cookieMap = new HashMap<>();        if (null != cookies) {            for (Cookie cookie : cookies) {                cookieMap.put(cookie.getName(), cookie);            }        }        return cookieMap;    }

    // 创建cookie    public static Cookie createCookie(String cookieName, String cookieValue, int maxAge) {        Cookie cookie = new Cookie(cookieName, cookieValue);        cookie.setMaxAge(maxAge);        cookie.setPath("/");        return cookie;    }}