src/main/java/com/yuanlrc/base/interceptor/admin/LoginInterceptor.java

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package com.yuanlrc.base.interceptor.admin;

import java.io.IOException;
import java.util.List;

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

import com.yuanlrc.base.config.AppConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import com.alibaba.fastjson.JSON;
import com.yuanlrc.base.bean.CodeMsg;
import com.yuanlrc.base.config.SiteConfig;
import com.yuanlrc.base.constant.SessionConstant;
import com.yuanlrc.base.entity.admin.Menu;
import com.yuanlrc.base.entity.admin.User;
import com.yuanlrc.base.util.MenuUtil;
import com.yuanlrc.base.util.StringUtil;

/**
 * 登录拦截器
 * @author Administrator
 *
 */
@Component
public class LoginInterceptor implements HandlerInterceptor{

	private Logger log = LoggerFactory.getLogger(LoginInterceptor.class);
	@Autowired
	private SiteConfig siteConfig;
	
	@Override
	public boolean  preHandle(HttpServletRequest request, HttpServletResponse response, Object handler){
		String requestURI = request.getRequestURI();
		HttpSession session = request.getSession();
		session.setAttribute(SessionConstant.SESSION_USER_AUTH_KEY, AppConfig.ORDER_AUTH);
		Object attribute = session.getAttribute(SessionConstant.SESSION_USER_LOGIN_KEY);
		if(attribute == null){
			log.info("用户还未登录或者session失效,重定向到登录页面,当前URL=" + requestURI);
			//首先判断是否是ajax请求
			if(StringUtil.isAjax(request)){
				//表示是ajax请求
				try {
					response.setCharacterEncoding("UTF-8");
					response.getWriter().write(JSON.toJSONString(CodeMsg.USER_SESSION_EXPIRED));
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				return false;
			}
			//说明是普通的请求，可直接重定向到登录页面
			//用户还未登录或者session失效,重定向到登录页面
			try {