elasticsearch(RestHighLevelClient API操作)(黑马)

小A敲代码2024-03-18 9:41

操作全是换汤不换药，创建一个request，然后使用client发送就可以了

一、增加索引库数据

java 复制代码

    @Test
    void testAddDocument() throws IOException {
        //从数据库查出数据
        Writer writer = writerService.getById(199);
        //将查出来的数据处理成json字符串
        String json = JSON.toJSONString(writer);

        // 1.准备Request
        IndexRequest request = new IndexRequest("writer").id(String.valueOf(writer.getId()));
        // 2.准备请求参数DSL，其实就是文档的JSON字符串
        request.source(json, XContentType.JSON);
        // 3.发送请求
        client.index(request, RequestOptions.DEFAULT);
    }

二、查询索引库顺序

java 复制代码

    @Test
    void testGetDocumentById() throws IOException {
        // 1.准备Request      // GET /hotel/_doc/{id}
        GetRequest request = new GetRequest("writer", "199");
        // 2.发送请求
        GetResponse response = client.get(request, RequestOptions.DEFAULT);
        // 3.解析响应结果
        String json = response.getSourceAsString();

        Writer writer = JSON.parseObject(json, Writer.class);
        System.out.println("writerDoc = " + writer);
    }

三、删除索引库数据

java 复制代码

@Test
    void testDeleteDocumentById() throws IOException {
        // 1.准备Request      // DELETE /hotel/_doc/{id}
        DeleteRequest request = new DeleteRequest("hotel", "61083");
        // 2.发送请求
        client.delete(request, RequestOptions.DEFAULT);
    }

四、修改索引库数据

java 复制代码

@Test
    void testUpdateById() throws IOException {
        // 1.准备Request
        UpdateRequest request = new UpdateRequest("hotel", "61083");
        // 2.准备参数
        request.doc(
                "price", "870"
        );
        // 3.发送请求
        client.update(request, RequestOptions.DEFAULT);
    }

五、批量导入数据

java 复制代码

@Test
    void testBulkRequest() throws IOException {
        List<Writer> list = writerService.list();
        BulkRequest request = new BulkRequest();
        for (Writer writer : list) {
            HotelDoc hotelDoc = new HotelDoc(hotel);
            String json = JSON.toJSONString(writer);
            request.add(new IndexRequest("writer").id(String.valueOf(writer.getId())).source(json, XContentType.JSON));
        }

        client.bulk(request, RequestOptions.DEFAULT);
    }