创建项目

略

导入依赖

注意依赖版本和安装的版本一致

<properties>
  <java.version>1.8</java.version>
  <elasticsearch.version>7.6.2</elasticsearch.version>
 </properties>

创建并编写配置类

@Configuration
public class ElasticSearchConfig {
    // 注册 rest高级客户端 
    @Bean
    public RestHighLevelClient restHighLevelClient(){
        RestHighLevelClient client = new RestHighLevelClient(
            RestClient.builder(
                new HttpHost("127.0.0.1",9200,"http")
            )
        );
        return client;
    }
}

测试

所有测试均在 SpringbootElasticsearchApplicationTests中编写

创建索引

   @Test
    void testCreateIndex() throws IOException {
        //1、创建索引请求
        CreateIndexRequest request = new CreateIndexRequest("jie-index");
        //2、客户端执行创建请求  请求后获得响应
        CreateIndexResponse response = client.indices().create(request, RequestOptions.DEFAULT);
        System.out.println(response);
    }

判断索引存在

    @Test
    void testExistIndex() throws IOException {
        GetIndexRequest request = new GetIndexRequest("jie-index");
        boolean exists = client.indices().exists(request, RequestOptions.DEFAULT);
        System.out.println(exists);
    }

删除索引

   @Test
    void testDeleteIndex() throws IOException {
        DeleteIndexRequest request = new DeleteIndexRequest("jie-index");
        AcknowledgedResponse delete = client.indices().delete(request, RequestOptions.DEFAULT);
        System.out.println(delete);
    }

添加文档

    //测试添加文档
    @Test
    void testAddDocument() throws IOException {
        //创建对象
        User user = new User("蛋黄派", 12);
        //创建请求
        IndexRequest request = new IndexRequest("jie-index");
        //规则 PUT / jie_index/_doc/1
        request.id("1");
        request.timeout(TimeValue.timeValueSeconds(1));
        request.timeout("1s");
        //将我们的数据放入请求 json
        request.source(JSON.toJSONString(user), XContentType.JSON);
        //客户端发送请求 获取响应结果
        IndexResponse index = client.index(request, RequestOptions.DEFAULT);
        System.out.println(index.toString());
        System.out.println(index.status());  //对应我们命令返回的状态
    }

获取文档判断是否存在

    //测试获取文档，判断是否存在 get /index/doc/1
    @Test
    void testIsExistDocument() throws IOException {
        GetRequest request = new GetRequest("jie-index", "1");
        // 不获取返回的 _source 的上下文
        request.fetchSourceContext(new FetchSourceContext(false));
        request.storedFields("_none_");
        boolean exists = client.exists(request, RequestOptions.DEFAULT);
        System.out.println(exists);
    }

获取文档信息

    //测试获取文档的信息
    @Test
    void testGetDocument() throws IOException {
        GetRequest request = new GetRequest("jie-index", "1");
        GetResponse response = client.get(request, RequestOptions.DEFAULT);
        String source = response.getSourceAsString();
        System.out.println(source);
        System.out.println(response);
    }

更新文档信息

    //更新文档的信息
    @Test
    void testUpdateDocument() throws IOException {
        UpdateRequest request = new UpdateRequest("jie-index", "1");
        request.timeout("1s");
        User user = new User("巧克力派", 13);
        request.doc(JSON.toJSONString(user),XContentType.JSON);
        UpdateResponse update = client.update(request, RequestOptions.DEFAULT);
        System.out.println(update.status());
        System.out.println(update);
    }

删除文档记录

    //删除文档记录
    @Test
    void testDeleteDocument() throws IOException {
        DeleteRequest request = new DeleteRequest("jie-index", "1");
        request.timeout("1s");
        DeleteResponse delete = client.delete(request, RequestOptions.DEFAULT);
        System.out.println(delete.status());
    }

批量插入数据

    //特殊的 批量插入数据
    @Test
    void testBulkRequest() throws IOException {
        BulkRequest bulkRequest = new BulkRequest();
        bulkRequest.timeout("1s");
        ArrayList<User> userList = new ArrayList<>();
        userList.add(new User("香芋派",11));
        userList.add(new User("紫薯派",12));
        userList.add(new User("苹果派",13));
        userList.add(new User("菠萝派",14));
        userList.add(new User("榴莲派",15));
        for (int i = 0; i < userList.size(); i++) {
            bulkRequest.add(new IndexRequest("jie-index")
                    .id(""+(i+1))
                    .source(JSON.toJSONString(userList.get(i)),XContentType.JSON));
        }
        BulkResponse bulk = client.bulk(bulkRequest, RequestOptions.DEFAULT);
        System.out.println(bulk.hasFailures());
    }

查询

    //查询
    @Test
    void testSearch() throws IOException {
        SearchRequest searchRequest = new SearchRequest("jie-index");
        //构建搜素条件
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        //查询条件 可以使用QueryBuilders工具来实现
//        QueryBuilders.termQuery() 精确
//        QueryBuilders.matchAllQuery()  匹配所有
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("name.keyword", "苹果派"); //中文要使用 keyword
        sourceBuilder.query(termQueryBuilder);
        sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));
        searchRequest.source(sourceBuilder);
        SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
        System.out.println(JSON.toJSONString(searchResponse.getHits()));
        System.out.println("++++++++++++++++++++++++++++++++++++++++");
        for (SearchHit documentFields : searchResponse.getHits().getHits()) {
            System.out.println(documentFields.getSourceAsMap());
        }
    }