用户登录拦截器实现+ThreadLocal线程共享变量

1. 配置类中添加拦截器

package com.kenai.gulimall.order.config;
import com.kenai.gulimall.order.interceptor.LoginUserInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class OrderWebConfiguration implements WebMvcConfigurer {
    
    
    @Autowired
    private LoginUserInterceptor loginUserInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
    
    
        // 所有请求都用loginUserInterceptor拦截器进行拦截
        registry.addInterceptor(loginUserInterceptor).addPathPatterns("/**");
    }
}

2. 用户登录拦截器具体实现

package com.kenai.gulimall.order.interceptor;
import com.kenai.common.constant.AuthServerConstant;
import com.kenai.gulimall.order.vo.MemberRespVo;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Component
public class LoginUserInterceptor implements HandlerInterceptor {
    
    
    // 使用ThreadLocal实现线程共享变量
    public static ThreadLocal<MemberRespVo> loginUser = new ThreadLocal<>();

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    
    
        MemberRespVo attribute = (MemberRespVo) request.getSession().getAttribute(AuthServerConstant.LOGIN_USER);
        if(attribute != null){
    
    
            // attribute用户信息放入loginUser中，只要该线程中任何地方都能获取用户信息
            loginUser.set(attribute);
            return true;
        }else{
    
    
            // 没有登录就去登录
            request.getSession().setAttribute("msg","请先进行登录");
            response.sendRedirect("http://auth.gulimall.com/login.html");
            return false;
        }
    }
}