ElasticSearch: 项目实战 (1)

需求：

新增文章审核通过后同步数据到es索引库

 1、文章服务中添加消息发送方法

               在service层文章新增成功后，将数据通过kafka消息同步发送到搜索服务

    @Autowired
    private KafkaTemplate<String,String> kafkaTemplate;

    /**
     * 送消息，创建索引
     * @param apArticle
     * @param content
     * @param path
     */
    private void createArticleESIndex(ApArticle apArticle, String content, String path) {
        SearchArticleVo vo = new SearchArticleVo();
        BeanUtils.copyProperties(apArticle,vo);
        vo.setContent(content);
        vo.setStaticUrl(path);

        kafkaTemplate.send(ArticleConstants.ARTICLE_ES_SYNC_TOPIC, JSON.toJSONString(vo));
    }

2、搜索服务中实现消息接收

        创建SyncArticleListener普通类来接收文章服务发送过来的数据

package com.heima.search.listener;

import com.alibaba.fastjson.JSON;
import com.heima.common.constants.ArticleConstants;
import com.heima.model.common.search.SearchArticleVo;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.xcontent.XContentType;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.stereotype.Component;

import java.io.IOException;

@Component
@Slf4j
public class SyncArticleListener {

    @Autowired
    private RestHighLevelClient restHighLevelClient;

    @KafkaListener(topics = ArticleConstants.ARTICLE_ES_SYNC_TOPIC)
    public void onMessage(String message){
        if(StringUtils.isNotBlank(message)){

            log.info("SyncArticleListener,message={}",message);
            /*添加数据到索引库*/
            SearchArticleVo searchArticleVo = JSON.parseObject(message, SearchArticleVo.class);
            IndexRequest indexRequest = new IndexRequest("app_info_article");
            indexRequest.id(searchArticleVo.getId().toString());
            indexRequest.source(message, XContentType.JSON);

            try {
                restHighLevelClient.index(indexRequest, RequestOptions.DEFAULT);
            } catch (IOException e) {
                e.printStackTrace();
                log.error("sync es error={}",e);
            }
        }

    }
}

3、分别配置文章服务和搜索服务的nacos

spring:
  kafka:
    bootstrap-servers: 192.168.200.130:9092
    consumer:
      group-id: ${spring.application.name}
      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
      value-deserializer: org.apache.kafka.common.serialization.StringDeserializer