springboot2整合elasticsearch7，并生成elasticsearch工具类和生成调用例子

好的，我可以为您提供相关的信息和代码示例。首先，您需要确保您的Spring Boot项目中包含以下依赖项：

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>
<dependency>
  <groupId>org.elasticsearch.client</groupId>
  <artifactId>elasticsearch-rest-high-level-client</artifactId>
  <version>7.0.0</version>
</dependency>

接下来，您需要在application.properties文件中添加以下配置：

spring.data.elasticsearch.cluster-name=my-application
spring.data.elasticsearch.cluster-nodes=localhost:9300

然后，您可以编写Elasticsearch工具类来执行一些常见的操作，例如索引文档、搜索文档等。以下是一个示例工具类：

import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.action.update.UpdateRequest;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.io.IOException;
import java.util.Map;

@Component
public class ElasticsearchUtil {

    @Autowired
    private RestHighLevelClient restHighLevelClient;

    /**
     * 索引文档
     * @param indexName 索引名称
     * @param id 文档ID
     * @param sourceMap 文档内容
     * @throws IOException
     */
    public void indexDocument(String indexName, String id, Map<String, Object> sourceMap) throws IOException {
        IndexRequest request = new IndexRequest(indexName);
        if (id != null) {
            request.id(id);
        }
        request.source(sourceMap);
        restHighLevelClient.index(request, RequestOptions.DEFAULT);
    }

    /**
     * 更新文档
     * @param indexName 索引名称
     * @param id 文档ID
     * @param sourceMap 文档内容
     * @throws IOException
     */
    public void updateDocument(String indexName, String id, Map<String, Object> sourceMap) throws IOException {
        UpdateRequest request = new UpdateRequest(indexName, id);
        request.doc(sourceMap);
        restHighLevelClient.update(request, RequestOptions.DEFAULT);
    }

    /**
     * 批量索引文档
     * @param indexName 索引名称
     * @param sourceMaps 文档内容列表
     * @throws IOException
     */
    public void bulkIndexDocuments(String indexName, Map<String, Object>[] sourceMaps) throws IOException {
        BulkRequest request = new BulkRequest();
        for (Map<String, Object> sourceMap : sourceMaps) {
            IndexRequest indexRequest = new IndexRequest(indexName);
            indexRequest.source(sourceMap);
            request.add(indexRequest);
        }
        restHighLevelClient.bulk(request, RequestOptions.DEFAULT);
    }

    /**
     * 批量更新文档
     * @param indexName 索引名称
     * @param idList 文档ID列表
     * @param sourceMap 文档内容
     * @throws IOException
     */
    public void bulkUpdateDocuments(String indexName, String[] idList, Map<String, Object> sourceMap) throws IOException {
        BulkRequest request = new BulkRequest();
        for (String id : idList) {
            UpdateRequest updateRequest = new UpdateRequest(indexName, id);
            updateRequest.doc(sourceMap);
            request.add(updateRequest);
        }
        restHighLevelClient.bulk(request, RequestOptions.DEFAULT);
    }

    /**
     * 获取文档
     * @param indexName 索引名称
     * @param id 文档ID
     * @return
     * @throws IOException
     */
    public Map<String, Object> getDocument(String indexName, String id) throws IOException {
        GetRequest request = new GetRequest(indexName, id);
        return restHighLevelClient.get(request, RequestOptions.DEFAULT).getSourceAsMap();
    }

    /**
     * 搜索文档
     * @param indexName 索引名称
     * @param keyword 关键词
     * @param size 每页数量
     * @param from 起始位置
     * @return
     * @throws IOException
     */
    public SearchHits searchDocuments(String indexName, String keyword, int size, int from) throws IOException {
        SearchRequest searchRequest = new SearchRequest(indexName);
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        searchSourceBuilder.query(QueryBuilders.matchQuery("content", keyword));
        searchSourceBuilder.from(from);
        searchSourceBuilder.size(size);
        searchSourceBuilder.timeout(TimeValue.timeValueSeconds(60));
        searchRequest.source(searchSourceBuilder);
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
        return searchResponse.getHits();
    }

}

最后，您可以在您的代码中使用ElasticsearchUtil类，并根据您的需求调用它的方法来执行所需的操作。以下是一个示例调用：

import org.elasticsearch.search.SearchHits;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

@RestController
public class DemoController {

    @Autowired
    private ElasticsearchUtil elasticsearchUtil;

    @GetMapping("/index")
    public String index() throws IOException {
        Map<String, Object> sourceMap = new HashMap<>();
        sourceMap.put("title", "Elasticsearch 7 教程");
        sourceMap.put("content", "Elasticsearch 7 入门教程");
        elasticsearchUtil.indexDocument("my_index", null, sourceMap);
        return "索引文档成功！";
    }

    @GetMapping("/search")
    public String search(@RequestParam("keyword") String keyword,
                         @RequestParam("size") int size,
                         @RequestParam("from") int from) throws IOException {
        SearchHits searchHits = elasticsearchUtil.searchDocuments("my_index", keyword, size, from);
        return searchHits.toString();
    }

}

希望这些代码示例可以帮助您整合Elasticsearch 7到您的Spring Boot项目中，并提供了一些常见的操作示例。