Mongodb：业务应用（1）

环境搭建参考：mongodb：环境搭建_Success___的博客-CSDN博客

需求：

在文章搜索服务中实现保存搜索记录到mongdb

并在搜索时查询出mongdb保存的数据

1、安装mongodb依赖

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        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-mongodb</artifactId>
        </dependency>

2、创建数据库对应实体类

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package com.heima.model.common.search;

import lombok.Data;
import org.springframework.data.mongodb.core.mapping.Document;

import java.io.Serializable;
import java.util.Date;

/**
 * <p>
 * APP用户搜索信息表
 * </p>
 * @author itheima
 */
@Data
@Document("ap_user_search")
public class ApUserSearch implements Serializable {

    private static final long serialVersionUID = 1L;

    /**
     * 主键
     */
    private String id;

    /**
     * 用户ID
     */
    private Integer userId;

    /**
     * 搜索词
     */
    private String keyword;

    /**
     * 创建时间
     */
    private Date createdTime;

}

3、配置nacos

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

实现保存

1、在搜索服务的service层新增搜索历史保存方法insert

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package com.heima.search.service;

import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.common.search.UserSearchDto;

import java.io.IOException;

public interface ArticleSearchService {

    /*文章搜索*/
    ResponseResult search(UserSearchDto dto) throws IOException;

    /**
     * 保存用户搜索历史记录
     * @param keyword
     * @param userId
     */
    void insert(String keyword,Integer userId);

}

2、实现类

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package com.heima.search.service.impl;

import com.heima.model.common.search.ApUserSearch;
import com.heima.search.service.ArticleSearchService;
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.scheduling.annotation.Async;
import org.springframework.stereotype.Service;

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

@Service
@Slf4j
public class ArticleSearchServiceImpl implements ArticleSearchService {
    

    @Autowired
    MongoTemplate mongoTemplate;

    /**
     * 保存用户搜索历史记录
     * @param keyword
     * @param userId
     */
    @Override
    @Async
    public void insert(String keyword, Integer userId) {
        /*查询当前用户搜索的关键字*/
        //构造查询条件
        Query query = Query.query(Criteria.where("userid").is(userId)
                .and("keyword").is(keyword));
        //执行mongodb库的查询
        ApUserSearch userSearch = mongoTemplate.findOne(query, ApUserSearch.class);

        /*存在则更新创建时间重新保存*/
        if(userSearch != null) {
            userSearch.setCreatedTime(new Date());
            mongoTemplate.save(userSearch);
            return;
        }

        /*不存在，判断当前搜索记录数量是否超过10条*/
        userSearch = new ApUserSearch();
        userSearch.setUserId(userId);
        userSearch.setKeyword(keyword);
        userSearch.setCreatedTime(new Date());

        //构造搜索条件
        Query query1 = Query.query(Criteria.where("userId")
                .is(userId));
        query1.with(Sort.by(Sort.Direction.DESC,"createdTime"));
        //执行查询
        List<ApUserSearch> list = mongoTemplate.find(query1, ApUserSearch.class);
        //判断list
        if(list == null || list.size() < 10){
            mongoTemplate.save(userSearch);
        }else {
            //获取mongodb中最后一条数据就
            ApUserSearch apUserSearch = list.get(list.size() - 1);
            //findAndReplace:根据查询条件替换库中的数据
            mongoTemplate.findAndReplace(
                    Query.query(Criteria.where("id")
                            .is(apUserSearch.getId())),
                    userSearch);
        }
    }

}

3、在文章搜索方法search中异步调用上面实现的保存记录方法

注意：异步调用的方法需要在方法上加@Async 注解，并在工程启动类加入 @EnableAsynczh****注解开启异步

@Async是 Spring 框架提供的注解，用于将方法标记为异步执行的方法。它的作用是告诉 Spring 框架在调用被注解的方法时，将其放入线程池中异步执行，而不是阻塞等待方法的完成。

service层完整代码如下

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package com.heima.search.service.impl;

import com.alibaba.cloud.commons.lang.StringUtils;
import com.alibaba.fastjson.JSON;
import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.common.enums.AppHttpCodeEnum;
import com.heima.model.common.search.ApUserSearch;
import com.heima.model.common.search.UserSearchDto;
import com.heima.model.common.user.ApUser;
import com.heima.search.service.ArticleSearchService;
import com.heima.utils.thread.AppThreadLocalUtil;
import lombok.extern.slf4j.Slf4j;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.index.query.*;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.sort.SortOrder;
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.scheduling.annotation.Async;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;

@Service
@Slf4j
public class ArticleSearchServiceImpl implements ArticleSearchService {

    @Autowired
    RestHighLevelClient restHighLevelClient;

    @Autowired
    MongoTemplate mongoTemplate;

   /*文章搜索*/
    @Override
    public ResponseResult search(UserSearchDto dto) throws IOException {
        //参数校验
        //1.检查参数
        if(dto == null || StringUtils.isBlank(dto.getSearchWords())){
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }

        ApUser user = AppThreadLocalUtil.getUser();

        //异步调用 保存搜索记录
        if(user != null && dto.getFromIndex() == 0){
            insert(dto.getSearchWords(), user.getId());
        }

        //2.设置查询条件
        SearchRequest searchRequest = new SearchRequest("app_info_article");
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        //布尔查询
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();

        //关键字的分词之后查询
        QueryStringQueryBuilder queryStringQueryBuilder = QueryBuilders.queryStringQuery(dto.getSearchWords()).field("title").field("content").defaultOperator(Operator.OR);
        boolQueryBuilder.must(queryStringQueryBuilder);

        //查询小于mindate的数据
//        RangeQueryBuilder rangeQueryBuilder = QueryBuilders.rangeQuery("publishTime").lt(dto.getMinBehotTime().getTime());
//        boolQueryBuilder.filter(rangeQueryBuilder);

        //分页查询
        searchSourceBuilder.from(0);
        searchSourceBuilder.size(dto.getPageSize());

        //按照发布时间倒序查询
        searchSourceBuilder.sort("publishTime", SortOrder.DESC);

        //设置高亮  title
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.field("title");
        highlightBuilder.preTags("<font style='color: red; font-size: inherit;'>");
        highlightBuilder.postTags("</font>");
        searchSourceBuilder.highlighter(highlightBuilder);


        searchSourceBuilder.query(boolQueryBuilder);
        searchRequest.source(searchSourceBuilder);
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);


        //3.结果封装返回

        List<Map> list = new ArrayList<>();

        SearchHit[] hits = searchResponse.getHits().getHits();
        for (SearchHit hit : hits) {
            String json = hit.getSourceAsString();
            Map map = JSON.parseObject(json, Map.class);
            //处理高亮
            if(hit.getHighlightFields() != null && hit.getHighlightFields().size() > 0){
                Text[] titles = hit.getHighlightFields().get("title").getFragments();
                String title = org.apache.commons.lang.StringUtils.join(titles);
                //高亮标题
                map.put("h_title",title);
            }else {
                //原始标题
                map.put("h_title",map.get("title"));
            }
            list.add(map);
        }

        return ResponseResult.okResult(list);
    }

    /**
     * 保存用户搜索历史记录
     * @param keyword
     * @param userId
     */
    @Override
    @Async
    public void insert(String keyword, Integer userId) {
        /*查询当前用户搜索的关键字*/
        //构造查询条件
        Query query = Query.query(Criteria.where("userid").is(userId)
                .and("keyword").is(keyword));
        //执行mongodb库的查询
        ApUserSearch userSearch = mongoTemplate.findOne(query, ApUserSearch.class);

        /*存在则更新创建时间重新保存*/
        if(userSearch != null) {
            userSearch.setCreatedTime(new Date());
            mongoTemplate.save(userSearch);
            return;
        }

        /*不存在，判断当前搜索记录数量是否超过10条*/
        userSearch = new ApUserSearch();
        userSearch.setUserId(userId);
        userSearch.setKeyword(keyword);
        userSearch.setCreatedTime(new Date());

        //构造搜索条件
        Query query1 = Query.query(Criteria.where("userId")
                .is(userId));
        query1.with(Sort.by(Sort.Direction.DESC,"createdTime"));
        //执行查询
        List<ApUserSearch> list = mongoTemplate.find(query1, ApUserSearch.class);
        //判断list
        if(list == null || list.size() < 10){
            mongoTemplate.save(userSearch);
        }else {
            //获取mongodb中最后一条数据就
            ApUserSearch apUserSearch = list.get(list.size() - 1);
            //findAndReplace:根据查询条件替换库中的数据
            mongoTemplate.findAndReplace(
                    Query.query(Criteria.where("id")
                            .is(apUserSearch.getId())),
                    userSearch);
        }
    }

}

4、测试

前端输入搜索内容

查看数据库mongdb中的数据成功添加

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