记一次Meilisearch轻量级搜索引擎使用

以前使用的是mysql的全文索引、最开始还行。后续觉得就不好用了，但是服务器资源有限，没法上ES，只好找一个轻量级的搜索引擎、找了半天，决定使用这一个，目前效果还不错的。

参考网址

官网：https://www.meilisearch.com/docs/reference/api/overview

java第三方sdk：https://github.com/meilisearch/meilisearch-java/issues

0、docker安装 很快的

略

安装好你可以通过 host:7700打开web页面

1、客户端的创建

package xxx.x.x;

import cn.hutool.core.util.ObjectUtil;
import com.meilisearch.sdk.Client;
import com.meilisearch.sdk.Config;
import com.meilisearch.sdk.json.JacksonJsonHandler;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Slf4j
@Component
public class MeilisearchConfig {
	
	@Value("${meilisearch.url:http://127.0.01:7700}")
	private String meilisearchUrl;
	@Value("${meilisearch.masterKey:}")
	private String masterKey = "masterKey";
	
	private volatile Client client;
	
	/**
	 * 获取 MeiliSearch 客户端
	 *
	 * @return
	 */
	public Client getClient() {
		if (ObjectUtil.isNull(client)) {
			synchronized (this) {
				if (ObjectUtil.isNull(client)) {
					client = buildClient();
				}
			}
		}
		return client;
	}
	
	/**
	 * 构建 MeiliSearch 客户端
	 *
	 * @return
	 */
	public Client buildClient() {
		Config config = new Config(meilisearchUrl, masterKey, new JacksonJsonHandler());
		client = new Client(config);
		log.info("MeiliSearch Client 初始化完成");
		return client;
	}
	
}

2、简单工具类

package xxx.util;

import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.ObjectUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONArray;
import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;
import cn.hutool.log.Log;
import cn.hutool.log.LogFactory;
import com.meilisearch.sdk.Client;
import com.meilisearch.sdk.Index;
import com.meilisearch.sdk.model.TaskInfo;
import top.shareus.bot.common.eumn.meilisearch.MeilisearchIndexEnums;

import java.util.List;

public class MeilisearchUtil {
	
	private final static Log log = LogFactory.getCurrentLogFactory().getLog(MeilisearchUtil.class);
	
	/**
	 * 添加文档
	 *
	 * @param meilisearchClient
	 * @param indexEnums
	 * @param objList
	 * @param <T>
	 */
	public static <T> void addDocuments(Client meilisearchClient, MeilisearchIndexEnums indexEnums, List<T> objList) {
		if (ObjectUtil.hasNull(meilisearchClient, indexEnums) || CollUtil.isEmpty(objList)) {
			return;
		}
		log.info("-----------------------------------------------------");
		
		JSONArray array = new JSONArray();
		
		List<JSONObject> objectList = objList.stream().map(JSONObject::new).toList();
		log.info("待添加文档数量: {}", objectList.size());
		
		array.put(objectList);
		String documents = array.getJSONArray(0).toString();
		
		Index index = meilisearchClient.index(indexEnums.getIndex());
		
		String primaryKey = indexEnums.getPrimaryKey();
		TaskInfo taskInfo;
		if (StrUtil.isBlank(primaryKey)) {
			taskInfo = index.addDocuments(documents);
		} else {
			taskInfo = index.addDocuments(documents, primaryKey);
		}
		
		log.info("添加文档任务ID: {}", taskInfo.getTaskUid());
		log.info("添加文档任务状态: {}", taskInfo.getStatus());
		log.info("添加文档任务信息：{}", JSONUtil.toJsonStr(taskInfo));
		
		log.info("添加文档任务结果：{}", JSONUtil.toJsonStr(index.getTask(taskInfo.getTaskUid())));
		log.info("-----------------------------------------------------");
	}
	
	/**
	 * 删除索引
	 *
	 * @param meilisearchClient
	 * @param indexEnums
	 */
	public static void delIndex(Client meilisearchClient, MeilisearchIndexEnums indexEnums) {
		if (ObjectUtil.hasNull(meilisearchClient, indexEnums)) {
			return;
		}
		meilisearchClient.deleteIndex(indexEnums.getIndex());
	}
}

3、练手的单元测试、索引创建、简单查询

主要用户对索引的创建、及简单的查询

		Client meilisearchClient = meilisearchConfig.getClient();
		Index index = meilisearchClient.index(MeilisearchIndexEnums.ARCHIVED_FILE.getIndex());
		meilisearchClient.deleteIndex(MeilisearchIndexEnums.ARCHIVED_FILE.getIndex());
		// 这里记得 每次创建索引 需要重新把你的一些筛选字段和排序字段重新添加一下
		TaskInfo taskInfo = index.updateFilterableAttributesSettings(new String[]{"name", "delFlag", "enabled", "archiveDate"});
		taskInfo = index.updateSortableAttributesSettings(new String[]{"archiveDate"});
		List<ArchivedFile> archivedFileList = archivedFileService.list();
		MeilisearchUtil.addDocuments(meilisearchClient, MeilisearchIndexEnums.ARCHIVED_FILE, archivedFileList);
		
		SearchRequest searchRequest = SearchRequest.builder()
				.limit(10)
				.page(1)
				.hitsPerPage(10)
				.sort(new String[]{"archiveDate:desc"})
				.showRankingScore(true)
				.attributesToSearchOn(new String[]{"name"})
				.matchingStrategy(MatchingStrategy.FREQUENCY)
				.rankingScoreThreshold(0.2)
				.filterArray(new String[][]{new String[]{"delFlag = 0", "enabled = 0"}})
				.q("笑对")
				.build();
		
		Searchable searchable = index.search(searchRequest);
		ArrayList<HashMap<String, Object>> searchableHits = searchable.getHits();
		List<ArchivedFile> copyToList = BeanUtil.copyToList(searchableHits, ArchivedFile.class);

4、设置index的区域

官方说这样会对中文更好一点，虽然不设置他也会自己检测 但是难免跑偏

PUT修改 GET查看

url: http://host:7700/indexes/**{index}** /settings/localized-attributes

body

[
  {
    "locales": [
      "cmn"
    ],
    "attributePatterns": [
      "*"
    ]
  }
]