專案下載地址：http://download.csdn.NET/detail/aqsunkai/9805821

定義一個攔截器，判斷使用者是通過記住我登入時，查詢資料庫後臺自動登入，同時把使用者放入session中。

配置攔截器也很簡單，Spring 為此提供了基礎類WebMvcConfigurerAdapter ，我們只需要重寫addInterceptors 方法添加註冊攔截器。

實現自定義攔截器只需要3步： 

1、建立我們自己的攔截器類並實現 HandlerInterceptor 介面。

2、建立一個Java類繼承WebMvcConfigurerAdapter，並重寫 addInterceptors 方法。

3、例項化我們自定義的攔截器，然後將對像手動新增到攔截器鏈中（在addInterceptors方法中新增）。

package com.sun.configuration;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.core.io.support.PropertiesLoaderUtils;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import java.io.IOException;
import java.util.Enumeration;
import java.util.Properties;

/**
 * Created by sun on 2017-3-21.
 */
@Configuration
public class WebMvcConfig extends WebMvcConfigurerAdapter {

    /**
     * 此方法把該攔截器例項化成一個bean,否則在攔截器裡無法注入其它bean
     * @return
     */
    @Bean
    SessionInterceptor sessionInterceptor() {
        return new SessionInterceptor();
    }
    /**
     * 配置攔截器
     * @param registry
     */
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(sessionInterceptor())
                .addPathPatterns("/**")
                .excludePathPatterns("/login","/permission/userInsert",
                        "/error","/tUser/insert","/gif/getGifCode");
    }

}
 

package com.sun.configuration;

import com.sun.permission.model.User;
import com.sun.permission.service.PermissionService;
import org.apache.log4j.Logger;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.session.Session;
import org.apache.shiro.subject.Subject;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Created by sun on 2017-4-9.
 */
public class SessionInterceptor implements HandlerInterceptor{
    private final Logger logger = Logger.getLogger(SessionInterceptor.class);
    @Resource
    private PermissionService permissionService;
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object o) throws Exception {
        logger.info("---preHandle---");
        System.out.println(request.getContextPath());
        Subject currentUser = SecurityUtils.getSubject();
        //判斷使用者是通過記住我功能自動登入,此時session失效
        if(!currentUser.isAuthenticated() && currentUser.isRemembered()){
            try {
                User user = permissionService.findByUserEmail(currentUser.getPrincipals().toString());
                //對密碼進行加密後驗證
                UsernamePasswordToken token = new UsernamePasswordToken(user.getEmail(), user.getPswd(),currentUser.isRemembered());
                //把當前使用者放入session
                currentUser.login(token);
                Session session = currentUser.getSession();
                session.setAttribute("currentUser",user);
                //設定會話的過期時間--ms,預設是30分鐘，設定負數表示永不過期
                session.setTimeout(-1000l);
            }catch (Exception e){
                //自動登入失敗,跳轉到登入頁面
                response.sendRedirect(request.getContextPath()+"/login");
                return false;
            }
            if(!currentUser.isAuthenticated()){
                //自動登入失敗,跳轉到登入頁面
                response.sendRedirect(request.getContextPath()+"/login");
                return false;
            }
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        logger.info("---postHandle---");
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        logger.info("---afterCompletion---");
    }
}