[大数据]ElasticSearch学习 （二）Springboot集成elasticsearch和完成一些基本的操作

引入maven依赖

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
    </dependency>

阿里快速JSON

    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.2.78</version>
    </dependency>

配置文件

public class ElasticSearchClientConfig {
    @Bean
    public RestHighLevelClient restHighLevelClient() {
        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(
                        new HttpHost("localhost", 9200, "http")));
        return client;
    }

}

索引操作

 @Autowired
    private RestHighLevelClient restHighLevelClient;
    // 创建索引
    @Test
    void testCreateIndex() throws IOException {
        CreateIndexRequest request = new CreateIndexRequest("w_index");
        CreateIndexResponse response = restHighLevelClient.indices().create(request, RequestOptions.DEFAULT);
        System.out.println(response);
    }
    // 查询索引是否存在
    @Test
    void testExistIndex() throws IOException {
        GetIndexRequest request = new GetIndexRequest("w_index");
        boolean exists = restHighLevelClient.indices().exists(request, RequestOptions.DEFAULT);
        System.out.println(exists);
    }
    // 删除索引
    @Test
    void testDeleteIndex() throws IOException {
        DeleteIndexRequest request = new DeleteIndexRequest("w_index");
        AcknowledgedResponse delete =  restHighLevelClient.indices().delete(request,RequestOptions.DEFAULT);
        System.out.println(delete.isAcknowledged());
    }

文档操作

 // 添加文档
    @Test
    void testAddDocument() throws IOException {
        // 创建对象
        User user = new User("wang",20);
        // 创建请求
        IndexRequest request = new IndexRequest("w_index");
        // 规则 put/w_index/_doc/1
        request.id("1");
        request.timeout(TimeValue.timeValueSeconds(1));
        request.timeout("1s");
        // 将请求放入json中
        request.source(JSON.toJSONString(user), XContentType.JSON);
        // 客户端发起请求 获取响应的结果
        IndexResponse indexResponse = restHighLevelClient.index(request,RequestOptions.DEFAULT);
        System.out.println(indexResponse.toString());
        System.out.println(indexResponse.status()); // 状态CREATED
    }
    // 测试文档是否存在
    @Test
    void testExistDocument() throws IOException {
        GetRequest getRequest = new GetRequest("w_index","1");
        //不获取source的上下文
        getRequest.fetchSourceContext(new FetchSourceContext(false));
        getRequest.storedFields("_none_");
        boolean exists = restHighLevelClient.exists(getRequest,RequestOptions.DEFAULT);
        System.out.println(exists);

    }
    // 查看文件信息
    @Test
    void testGetDocument() throws IOException {
       GetRequest getRequest = new GetRequest("w_index","1");
       GetResponse getResponse = restHighLevelClient.get(getRequest, RequestOptions.DEFAULT);
        System.out.println(getResponse.getSource());
        System.out.println(getResponse.getFields());
    }
    // 更新文件信息
    @Test
    void testUpdateDocument() throws IOException {
        // 创建请求
        UpdateRequest updateRequest = new UpdateRequest("w_index","1");
        // 设置失效时间
        updateRequest.timeout("1s");
        User user = new User("wan",1);
        updateRequest.doc(JSON.toJSONString(user),XContentType.JSON);
        UpdateResponse updateResponse = restHighLevelClient.update(updateRequest,RequestOptions.DEFAULT);
        System.out.println(updateResponse);
    }
    // 删除文件信息
    @Test
    void testDeleteDocument() throws IOException {
        DeleteRequest deleteRequest = new DeleteRequest("w_index","1");
        deleteRequest.timeout("1s");
        DeleteResponse deleteResponse = restHighLevelClient.delete(deleteRequest,RequestOptions.DEFAULT);
        System.out.println(deleteResponse.status());
    }

    // 批量插入文件
    @Test
    void testBulkDocument() throws IOException {
        BulkRequest bulkRequest = new BulkRequest("");
        bulkRequest.timeout("10s");
        List<User> userList = new ArrayList<>();
        userList.add(new User("1",1));
        userList.add(new User("2",2));
        userList.add(new User("3",3));
        userList.add(new User("4",4));
        userList.add(new User("5",5));
        for (int i = 0; i <userList.size(); i++) {
            bulkRequest.add(
                    new IndexRequest("w_index").
                            id(""+(i+1)).
                            source(JSON.toJSONString(userList.get(i)),XContentType.JSON));
        }
        BulkResponse bulkResponse = restHighLevelClient.bulk(bulkRequest,RequestOptions.DEFAULT);
        System.out.println(bulkResponse.hasFailures());
    }

    //    查询是最重要的
    @Test
    void testSearchDocument() throws IOException {
        SearchRequest searchRequest = new SearchRequest("w_index");
//        构建搜索的条件
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
//        构建查询,查询条件，使用 QueryBuilders 工具来实现
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("name", "1");
//        查询所有
//        MatchAllQueryBuilder termQueryBuilder1 = QueryBuilders.matchAllQuery();
        sourceBuilder.query(termQueryBuilder);
//        sourceBuilder.from();
//        sourceBuilder.size();
        sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));
//        构建搜索
        searchRequest.source(sourceBuilder);
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
        System.out.println(JSON.toJSONString(searchResponse.getHits()));
        for (SearchHit documentFields : searchResponse.getHits().getHits()) {
            System.out.println(documentFields.getSourceAsMap());
        }
    }