利用threadLocal把拦截器中的对象传递到controller中

应用场景

在Controller中获取用户信息

添加UserThreadLocal

package com.thy.common;

public class UserThreadLocal {

    //把构造函数私有，外面不能new，只能通过下面两个方法操作
    private UserThreadLocal(){
    }

    private static final ThreadLocal LOCAL = new ThreadLocal(); 

    public static void set(MpUserInfo user){
        LOCAL.set(user);;
    }

    public static MpUserInfo get(){
        return LOCAL.get();
    }
}

登录拦截器

在获取到用户信息后存入UserThreadLocal，在拦截器的afterCompletion方法中清空UserThreadLocal。

import java.io.PrintWriter;

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

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import com.alibaba.fastjson.JSON;
import com.thy.common.MpUserInfo;
import com.thy.common.ReturnData;
import com.thy.common.UserThreadLocal;
import com.thy.util.RedisUtils;

@Component
public class TokenInterceptor implements HandlerInterceptor{
    
    
    //private static final Logger log = LoggerFactory.getLogger(TokenInterceptor.class);

    @Autowired
    private RedisUtils redisUtils;
    
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object o) throws Exception {
        //log.info("---------------------开始进入请求地址拦截----------------------------");
        //接收token
        String token = request.getParameter("accessToken");
        if (null == token) {
            response.setCharacterEncoding("utf-8");
            response.setContentType("application/json; charset=utf-8");
            PrintWriter writer = response.getWriter();
            ReturnData returnData = ReturnData.error("未授权的请求");
            writer.write(JSON.toJSONString(returnData));
            return false;
        }
        MpUserInfo t = (MpUserInfo) redisUtils.get(token);
        if(t==null) {
            response.setCharacterEncoding("utf-8");
            response.setContentType("application/json; charset=utf-8");
            PrintWriter writer = response.getWriter();
            ReturnData returnData = ReturnData.error("accessToken已过期");
            writer.write(JSON.toJSONString(returnData));
            return false;
        }
        //将用户信息存入UserThreadLocal
        UserThreadLocal.set(t);
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        //log.info("--------------处理请求完成后视图渲染之前的处理操作---------------");
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        //log.info("---------------视图渲染之后的操作-------------------------0");
        //将UserThreadLocal中的用户信息清除
        UserThreadLocal.set(null);
    }
}

获取用户信息

在controller或service中调用

MpUserInfo mpUserInfo = UserThreadLocal.get();