电商项目前台搜索服务es实现

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
 
@Service
public class SearchService {
 
    @Autowired
    private RestHighLevelClient client;
 
    public List<SearchItem> searchItems(String keyword) throws IOException {
        // 1. 创建查询构建器
        SearchRequest searchRequest = new SearchRequest("items");
        // 2. 查询条件构建
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        // 2.1. 使用match查询
        searchSourceBuilder.query(QueryBuilders.matchQuery("name", keyword));
        // 2.2. 分页设置
        searchSourceBuilder.from(0);
        searchSourceBuilder.size(10);
        // 2.3. 排序设置
        searchSourceBuilder.sort("id", SortOrder.ASC);
        searchRequest.source(searchSourceBuilder);
        // 3. 执行查询
        SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
        // 4. 解析结果
        SearchHits hits = searchResponse.getHits();
        List<SearchItem> itemList = new ArrayList<>();
        for (SearchHit hit : hits) {
            String json = hit.getSourceAsString();
            SearchItem item = JSON.parseObject(json, SearchItem.class);
            itemList.add(item);
        }
        // 5. 返回结果
        return itemList;
    }
}

这段代码实现了一个简单的搜索服务，它使用Elasticsearch的RestHighLevelClient来执行搜索查询。它构建了一个搜索请求，并设置了查询条件，然后执行查询并解析返回的结果。这个例子展示了如何在实际的电商项目中使用Elasticsearch来实现前台搜索功能。