java引入es使用

引入依赖

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
</dependency>

初始化对象

RestHighLevelClient client = new RestHighLevelClient(RestClient.builder(
        HttpHost.create("http://192.168.150.101:9200")
));

索引CRUD操作

public class ElasticIndexTest {
    private RestHighLevelClient client;
    @BeforeEach
    void setUp(){
        client=new RestHighLevelClient(RestClient.builder(new HttpHost("192.168.88.95",9200,"http")));
    }

    @AfterEach
    void tearDown() throws IOException {
        if(client!=null)
            client.close();
    }

    @Test
    void create() throws IOException {
        CreateIndexRequest test = new CreateIndexRequest("hmall");
        test.source(MAPPING_TEMPLATE, XContentType.JSON);
        client.indices().create(test, RequestOptions.DEFAULT);
    }
    @Test
    void get() throws IOException {
        GetIndexRequest test = new GetIndexRequest("hmall");
        client.indices().get(test, RequestOptions.DEFAULT);
    }
    @Test
    void delete() throws IOException {
        DeleteIndexRequest test = new DeleteIndexRequest("hmall");
        client.indices().delete(test, RequestOptions.DEFAULT);
    }
    private final static String MAPPING_TEMPLATE="{\n" +
            "  \"mappings\": {\n" +
            "    \"properties\": {\n" +
            "      \"id\":{\n" +
            "        \"type\": \"keyword\"\n" +
            "      },\n" +
            "      \"name\":{\n" +
            "        \"type\": \"text\",\n" +
            "        \"analyzer\": \"ik_smart\"\n" +
            "      },\n" +
            "      \"price\":{\n" +
            "        \"type\": \"integer\"\n" +
            "      },\n" +
            "      \"image\":{\n" +
            "        \"type\": \"keyword\",\n" +
            "        \"index\": false\n" +
            "      },\n" +
            "      \"category\":{\n" +
            "        \"type\": \"keyword\"\n" +
            "      },\n" +
            "      \"brand\":{\n" +
            "        \"type\": \"keyword\"\n" +
            "      },\n" +
            "      \"sold\":{\n" +
            "        \"type\": \"integer\"\n" +
            "      },\n" +
            "      \"comment_count\":{\n" +
            "        \"type\": \"integer\",\n" +
            "        \"index\": false\n" +
            "      },\n" +
            "      \"isAD\":{\n" +
            "        \"type\": \"boolean\"  \n" +
            "      },\n" +
            "      \"update_time\":{\n" +
            "        \"type\": \"date\"\n" +
            "      }\n" +
            "    }\n" +
            "  }\n" +
            "}";
}

文档CRUD操作

public class ElasticDocumentTest {
    @Autowired
    private IItemService service;
    private RestHighLevelClient client;
    @BeforeEach
    void setUp(){
        client=new RestHighLevelClient(RestClient.builder(new HttpHost("192.168.88.95",9200,"http")));
    }

    @AfterEach
    void tearDown() throws IOException {
        if(client!=null)
            client.close();
    }

    /* 新增
     * 全量修改：写入重复ID即视为全量修改
     * */
    @Test
    void addAndUpdateDoc() throws IOException {
        Item byId = service.getById("317578");
        ItemDoc itemDoc = BeanUtil.copyProperties(byId, ItemDoc.class);

        IndexRequest request=new IndexRequest("hmall").id(itemDoc.getId());
        request.source(JSONUtil.toJsonStr(itemDoc),XContentType.JSON);
        client.index(request,RequestOptions.DEFAULT);
    }
    /*局部修改*/
    @Test
    void updateDoc() throws IOException {
        UpdateRequest request=new UpdateRequest("hmall","317578");
        request.doc(
                "price","25600"
        );
        client.update(request,RequestOptions.DEFAULT);
    }
    /*查询*/
    @Test
    void getDoc() throws IOException {
        GetRequest getRequest=new GetRequest("hmall","317578");
        GetResponse response = client.get(getRequest, RequestOptions.DEFAULT);
        String json = response.getSourceAsString();
        ItemDoc itemDoc = JSONUtil.toBean(json, ItemDoc.class);
    }
    /*删除*/
    @Test
    void deleteDoc() throws IOException {
        DeleteRequest deleteRequest=new DeleteRequest("hmall","317578");
        client.delete(deleteRequest, RequestOptions.DEFAULT);

    }
}

文档批处理操作：

    /*批处理*/
    @Test
    void bulkDoc() throws IOException {
        int pageSize=500;
        int pageNum=1;
        while(true){
            Page<Item> page = service.lambdaQuery()
                    .eq(Item::getStatus, 1)
                    .page(Page.of(pageNum, pageSize));
            List<Item>items=page.getRecords();
            if(items==null||items.isEmpty()){
                return;
            }
            BulkRequest request=new BulkRequest();

            for (Item item : items) {
                request.add(new IndexRequest("hmall")
                        .id(item.getId().toString())
                        .source(JSONUtil.toJsonStr(BeanUtil.copyProperties(item, ItemDoc.class)),XContentType.JSON)
                );
            }
            client.bulk(request,RequestOptions.DEFAULT);
            pageNum++;
        }

    }