ElasticSearch-javaAPI-索引与文档操作

1.引入elasticsearch与json依赖

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>7.4.0</version>
</dependency>
<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-client</artifactId>
    <version>7.4.0</version>
</dependency>
<dependency>
    <groupId>org.elasticsearch</groupId>
    <artifactId>elasticsearch</artifactId>
    <version>7.4.0</version>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.47</version>
</dependency>

2.编写ElasticSearchConfig

@Configuration
@ConfigurationProperties(prefix = "elasticsearch")
public class ElasticSearchConfig {
    private String host;
    private int port;

    public String getHost() {
        return host;
    }

    public void setHost(String host) {
        this.host = host;
    }

    public int getPort() {
        return port;
    }

    public void setPort(int port) {
        this.port = port;
    }

    @Bean
    public RestHighLevelClient client(){
        return new RestHighLevelClient(RestClient.builder(new HttpHost(host,port,"http")));
    }
}

3.配置application.yml

elasticsearch:
  host: 127.0.0.1
  port: 9200

4.注入RestHighLevelClient ，添加索引与映射

@Autowired
private RestHighLevelClient client;

/**
 * 创建索引与映射
 * @throws IOException
 */
@Test
void addIndexAndMapping() throws IOException {
    //获取操作索引的对象
    IndicesClient indices = client.indices();
    //设置索引名称与mapping
    CreateIndexRequest createIndexRequest=new CreateIndexRequest("mmm");
    String mapping="{\n" +
            "      \"properties\" : {\n" +
            "        \"address\" : {\n" +
            "          \"type\" : \"text\",\n" +
            "          \"fields\" : {\n" +
            "            \"keyword\" : {\n" +
            "              \"type\" : \"keyword\",\n" +
            "              \"ignore_above\" : 256\n" +
            "            }\n" +
            "          }\n" +
            "        },\n" +
            "        \"age\" : {\n" +
            "          \"type\" : \"integer\"\n" +
            "        },\n" +
            "        \"name\" : {\n" +
            "          \"type\" : \"keyword\"\n" +
            "        }\n" +
            "      }\n" +
            "    }";
    createIndexRequest.mapping(mapping,XContentType.JSON);
    //创建索引，获取返回值
    CreateIndexResponse createIndexResponse = indices.create(createIndexRequest, RequestOptions.DEFAULT);
    System.out.println(createIndexResponse);
}

5.删除索引

/**
 * 删除索引
 */
@Test
void deleteIndex() throws IOException {
    //获取索引操作对象
    IndicesClient indices = client.indices();
    //设置删除索引名称
    DeleteIndexRequest deleteIndexRequest=new DeleteIndexRequest("myx");
    //删除索引
    AcknowledgedResponse delete = indices.delete(deleteIndexRequest, RequestOptions.DEFAULT);
    System.out.println(delete);
}

6.判断索引是否存在

/**
 * 判断索引是否存在
 */
@Test
void existIndex() throws IOException {
    IndicesClient indices = client.indices();
    GetIndexRequest getIndexRequest=new GetIndexRequest("mmm");
    boolean exists = indices.exists(getIndexRequest, RequestOptions.DEFAULT);
    System.out.println(exists);
}

7.添加或修改文档

/**
 * 添加或修改文档
 */
@Test
void addDoc() throws IOException {
    //数据源
    /*Map data=new HashMap();
    data.put("address","湖南长沙");
    data.put("age",33);
    data.put("name","张三");
    IndexRequest indexRequest=new IndexRequest("mmm").id("1").source(data);*/
    Person p=new Person();
    p.setAddress("湖南株洲");
    p.setId("2");
    p.setAge(30);
    p.setName("李四");
    String data = JSON.toJSONString(p);
    IndexRequest indexRequest=new IndexRequest("mmm").id(p.getId()).source(data,XContentType.JSON);
    IndexResponse index = client.index(indexRequest, RequestOptions.DEFAULT);
    System.out.println(index.getId());
}

8.查询文档

/**
 * 查询文档
 */
@Test
void getDoc() throws IOException {
    GetRequest getRequest=new GetRequest("mmm","1");
    GetResponse response = client.get(getRequest, RequestOptions.DEFAULT);
    System.out.println(response.getSourceAsString());
}

9.删除文档

/**
 * 删除文档
 */
@Test
void deleteDoc() throws IOException {

    DeleteRequest deleteRequest =new DeleteRequest("mmm","1");
    DeleteResponse delete = client.delete(deleteRequest, RequestOptions.DEFAULT);
}