session和cookie的使用

Posted 2020-10-05 koushr

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;
    }
}