请问最代码这种记住登录实现方式？java过滤器不拦截？

最代码的记住登陆机制是通过客户端cookie和服务端session实现的。

拦截器代码

UserInterceptor.java

package com.zuidaima.interceptor;

import java.util.Date;
import java.util.List;

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

import net.sf.json.JSONObject;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import com.javaniu.core.constants.GlobalConstants;
import com.javaniu.core.constants.ModuleConstants;
import com.javaniu.core.module.User;
import com.javaniu.core.module.support.ModuleDesc;
import com.javaniu.core.service.UserService;
import com.javaniu.core.service.impl.OnlineUserRemind;
import com.javaniu.core.util.CookieUtil;
import com.javaniu.core.util.Security;

/**
*@author www.zuidaima.com
**/
public class UserInterceptor extends HandlerInterceptorAdapter {

	@Autowired
	public UserService userService;
	@Autowired
	public OnlineUserRemind onlineUserRemind;

	public String getIpAddr(HttpServletRequest request) {
		String ip = request.getHeader("x-forwarded-for");
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("Proxy-Client-IP");
		}
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("WL-Proxy-Client-IP");
		}
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getRemoteAddr();
		}
		return ip;
	}

	@Override
	public boolean preHandle(HttpServletRequest request,
			HttpServletResponse response, Object handler) throws Exception {
		HttpSession session = request.getSession();
		User user = (User) session
				.getAttribute(GlobalConstants.SESSION_LOGIN_USER_NAME);
		if (user != null) {// 以db中user为准,以后需要refactor
			User _user = userService.findOneById(user.getId());
			if (_user.getStatus() != ModuleConstants.MODULE_STATUS_NORMAL) {// 让退出
				session.removeAttribute(GlobalConstants.SESSION_LOGIN_USER_NAME);
				// 主动退出则删除cookie
				Cookie cookie = CookieUtil.newLogoutCookie(user.getId());
				response.addCookie(cookie);
				response.sendRedirect("/user/login.htm");
				return true;
			}
			// 从db中重新设置会变动属性
			// login time不要copy
			String name = _user.getName();
			user.setName(name);
			String avatarUrl = _user.getAvatarUrl();
			user.setAvatarUrl(avatarUrl);
			int niubi = _user.getNiubi();
			user.setNiubi(niubi);
			updateIp(user, request);
			return true;
		}

		Cookie[] cookies = request.getCookies();
		Cookie cookie = CookieUtil.findLoginCookie(cookies);
		if (cookie == null) {// 不强制登录
			return true;
		}
		String descUId = cookie.getValue();
		Long userId = Security.decryptUserId(descUId);
		if (userId == null) {// 非法用户帐号
			return true;
		}
		user = userService.findOneById(userId);
		if (user == null) {// 非法用户帐号
			return true;
		}
		if (user.getStatus() != ModuleConstants.MODULE_STATUS_NORMAL) {// 不正常的账号
			return true;
		}
		updateIp(user, request);
		// every ok
		session.setAttribute(GlobalConstants.SESSION_LOGIN_USER_NAME, user);
		user.setUpdateTime(new Date());
		userService.save(user);
		return true;
	}

	private void updateIp(User user, HttpServletRequest request) {
		String lastloginIp = getIpAddr(request);
		String ip = null;
		if (user.getExtend().containsKey(
				ModuleConstants.USER_EXTEND_LASTLOGIN_IP)) {
			ip = user.getExtend().getString(
					ModuleConstants.USER_EXTEND_LASTLOGIN_IP);
		}
		if (lastloginIp != null) {
			if (ip == null || !lastloginIp.equals(ip)) {
				JSONObject extend = user.getExtend();
				extend.put(ModuleConstants.USER_EXTEND_LASTLOGIN_IP,
						lastloginIp);
				user.setExtendJson(extend.toString());
				userService.save(user);
			}
		}
	}

	public void postHandle(HttpServletRequest request,
			HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		HttpSession session = request.getSession();
		User user = (User) session
				.getAttribute(GlobalConstants.SESSION_LOGIN_USER_NAME);
		if (user == null) {
			return;
		}
		user.setLoginTime(new Date());
		List<ModuleDesc> remindDescs = onlineUserRemind.getRemindDescs(user);
		session.setAttribute("remindDescs", remindDescs);
	}
}