Spring Boot 集成ElasticSearch：实现搜索功能

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.elasticsearch.core.ElasticsearchTemplate;
import org.springframework.data.elasticsearch.core.query.NativeSearchQueryBuilder;
import org.springframework.stereotype.Service;
 
@Service
public class SearchService {
 
    @Autowired
    private ElasticsearchTemplate elasticsearchTemplate;
 
    public Page<Item> searchItems(String query, int page, int size) {
        PageRequest pageRequest = PageRequest.of(page, size);
        NativeSearchQueryBuilder nativeSearchQueryBuilder = new NativeSearchQueryBuilder()
                .withQuery(queryStringQuery(query).field("name"))
                .withPageable(pageRequest);
 
        Page<Item> results = elasticsearchTemplate.queryForPage(nativeSearchQueryBuilder.build(), Item.class);
        return results;
    }
}

这段代码展示了如何在Spring Boot应用程序中使用ElasticsearchTemplate来执行基本的搜索操作。searchItems方法接收查询字符串和分页信息，然后构建一个Elasticsearch的查询并执行它，最后返回搜索结果的页面。这个例子简单明了，并且使用了Elasticsearch的Query DSL来定义查询条件。