保存搜索记录

一、实现思路

输入关键字——》搜索——异步请求——》记录关键字

【异步请求保存关键字，让用户快速看到搜索结果，等待时间更短】

保存——>查询搜索记录——存在——更新到最新时间

　　　　　　　　　　　　不存在——搜索记录的数量是否超过10——没超过则直接保存，超过则替换最后一条数据即时间最久

二、实现步骤

1、搜索微服务集成mongodb

pom依赖

nacos配置

创建对应实体类

 <!--mongoDB-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </dependency>

server:
  port: 9998
spring:
  data:
    mongodb:
      host: 192.168.200.130
      port: 27017
      database: leadnews-history

2、创建ApUserSearchService新增insert方法

查询当前用户搜索的关键词是否存在

存在则更新最新时间

不存在则新增, 判断当前历史记录是否超过10条记录

package com.heima.search.service.impl;

import com.heima.search.pojos.ApUserSearch;
import com.heima.search.service.ApUserSearchService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Sort;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.stereotype.Service;

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


@Service
@Slf4j
public class ApUserSearchServiceImpl implements ApUserSearchService {
    @Autowired
    private MongoTemplate mongoTemplate;
    
    /**
     * 保存用户搜索历史记录
     *
     * @param keyword
     * @param userId
     */
    @Override
    public void insert(String keyword, Integer userId) {
        //1、查询当前用户搜索关键词
        Query query = Query.query(Criteria.where("userId").is(userId).and("keyword").is(keyword));
        ApUserSearch apUserSearch = mongoTemplate.findOne(query, ApUserSearch.class); //用户搜索信息表
        //2、存在更新创建时间
        if(apUserSearch != null){
            apUserSearch.setCreatedTime(new Date());
            mongoTemplate.save(apUserSearch);
            return;
        }
        //3、不存在，判断当前历史记录总数是否超过10
        apUserSearch = new ApUserSearch();
        apUserSearch.setUserId(userId);
        apUserSearch.setKeyword(keyword);
        apUserSearch.setCreatedTime(new Date());
        
        Query query1 = Query.query(Criteria.where("userId").is(userId));
        query1.with(Sort.by(Sort.Direction.DESC, "createdTime"));
        List<ApUserSearch> apUserSearches = mongoTemplate.find(query1, ApUserSearch.class);
        
        if(apUserSearches == null || apUserSearches.size() < 10){
            mongoTemplate.save(apUserSearch);
        }else{
            ApUserSearch lastUserSearch = apUserSearches.get(apUserSearches.size() - 1);
            mongoTemplate.findAndReplace(Query.query(Criteria.where("id").is(lastUserSearch.getId())), apUserSearch);
        }


    }
}

3、参考自媒体相关微服务，在搜索微服务中获取当前登录的用户【ThreadLocal、Interceptor】

在app网关中把用户id存入header

//获取用户信息
            Object userId = claimsBody.get("id");

            //存入header
            ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> {
                httpHeaders.add("userId", userId + "");
            }).build();
            //重置请求
            exchange.mutate().request(serverHttpRequest);

 在interceptor中获取id存在Threadlocal

package com.heima.utils.common.thread;

import com.heima.model.user.pojos.ApUser;
import com.heima.model.wemedia.pojos.WmUser;

public class AppThreadLocalUtil {
    public final  static ThreadLocal<ApUser> WM_USER_THREAD_LOCAL = new ThreadLocal<>();

    //存入线程
    public static void setUser(ApUser apUser){
        WM_USER_THREAD_LOCAL.set(apUser);
    }

    //从线程中获取
    public static ApUser getUser(){
        return WM_USER_THREAD_LOCAL.get();
    }

    //清理
    public static void clear(){
        WM_USER_THREAD_LOCAL.remove();
    }
}

package com.heima.search.interceptor;

import com.heima.model.user.pojos.ApUser;
import com.heima.model.wemedia.pojos.WmUser;
import com.heima.utils.common.thread.AppThreadLocalUtil;
import com.heima.utils.common.thread.WmThreadLocalUtil;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

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

public class AppTokenInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String userId = request.getHeader("userId");

        if(userId != null){
            //存入当前线程
            ApUser apUser = new ApUser();
            apUser.setId(Integer.valueOf(userId));
            AppThreadLocalUtil.setUser(apUser);
        }

        return true;
    }



    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        AppThreadLocalUtil.clear();
    }
}

package com.heima.search.config;

import com.heima.search.interceptor.AppTokenInterceptor;
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 WebMvcConfig implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new AppTokenInterceptor()).addPathPatterns("/**");
    }
}

 
4、在ArticleSearchService的search方法中调用保存历史记录

 ApUser user = AppThreadLocalUtil.getUser();
        //异步调用保存搜索记录:不登录不能保存, 搜索词首页才保存搜索历史
        if(user != null && dto.getFromIndex() == 0){
            apUserSearchService.insert(dto.getSearchWords(), user.getId());
        }

5、保存历史记录中开启异步调用，添加注解@Async

6、在搜索微服务引导类上开启异步调用

7.测试，搜索后查看结果