Java操作elasticSearch索引保存数据

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Java操作elasticSearch索引保存数据

计划与实现：

存储一个新索引students，然后保存文档

借助Kibana:å
GET /students/_search

结果：
{
  "error" : {
    "root_cause" : [
      {
        "type" : "index_not_found_exception",
        "reason" : "no such index [students]",
        "resource.type" : "index_or_alias",
        "resource.id" : "students",
        "index_uuid" : "_na_",
        "index" : "students"
      }
    ],
    "type" : "index_not_found_exception",
    "reason" : "no such index [students]",
    "resource.type" : "index_or_alias",
    "resource.id" : "students",
    "index_uuid" : "_na_",
    "index" : "students"
  },
  "status" : 404
}

索引不存在
单元测试

索引数据的请求是个网络操作，所以会有异常处理。

//做一个学生对象
	//注解后setter getter
	@Data
	class Student{
		private String name;
		private Integer age;
		private String gender;
	}

	@Test
	public void indexData() throws IOException {
		//索引
		IndexRequest indexRequest = new IndexRequest("students");
		//数据id 不设置会自动生成
		indexRequest.id("1");

		Student student = new Student();
		student.setAge(18);
		student.setGender("男");
		student.setName("张铁蛋");
		//对象转换json
		String jsonString = JSON.toJSONString(student);
		//索引对象加入对象json  声明保存形式
		indexRequest.source(jsonString, XContentType.JSON);
		//用容器中导入的client 调用请求  索引对象 和 配置参数 这个配置参数是整合配置时搞定的
		IndexResponse index = client.index(indexRequest, GuilimallElasticSearchConfig.COMMON_OPTIONS);
		//index为相应数据
		System.out.println(index);
	}

执行：

2021-11-05 16:01:28.219  INFO 1548 --- [           main] c.a.g.s.GulimallSearchApplicationTests   : Started GulimallSearchApplicationTests in 18.417 seconds (JVM running for 19.985)
IndexResponse[index=students,type=_doc,id=1,version=1,result=created,seqNo=0,primaryTerm=1,shards={"total":2,"successful":1,"failed":0}]
2021-11-05 16:01:32.019  INFO 1548 --- [       Thread-9] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService 'applicationTaskExecutor'

Process finished with exit code 0
在看一下Kibana:
GET /students/_search

结果集：

{
  "took" : 0,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "students",
        "_type" : "_doc",
        "_id" : "1",
        "_score" : 1.0,
        "_source" : {
          "age" : 18,
          "gender" : "男",
          "name" : "张铁蛋"
        }
      }
    ]
  }
}

保存成功

Java操作elasticSearch整合SpringBoot

针对elasticSearch不同端口操作客户端API：

1）、9300：TCP （es集群通讯9300）

​ · spring-data-elasticsearch:transport-api.jar；

​ · springboot 版本不同， transport-api.jar 不同，不能适配 es 版本

​ · 官网 es的版本：7.x 已经不建议使用，8 以后就要废弃

2）、9200：HTTP

​ · JestClient：非官方，更新慢

​ · RestTemplate：模拟发 HTTP 请求，ES 很多操作需要自己封装，麻烦

  	· HttpClient：同上 

  	▷ Elasticsearch-Rest-Client：官方 RestClient，封装了 ES 操作，API 层次分明，上手简单 最终选择 Elasticsearch-Rest-Client（elasticsearch-rest-high-level-client） https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/java-rest-high.html

▷Elasticsearch-Rest-Client（elasticsearch-rest-high-level-client）

整合SpringBoot

版本说明：elasticSearch版本 kibana版本 Elasticsearch-Rest-Client版本 请保持一致

<dependency>
<groupId>org.elasticsearch.client</groupId>
<artifactId>elasticsearch-rest-high-level-client</artifactId>
<version>7.4.2</version>
</dependency>
配置： 容器中导入RestHighLevelClient 操作以及加密鉴权
**
 * 1.导入依赖
 * 2.容器中导入RestHighLevelClient 操作9200
 */
//注解配置启动容器自动执行
@Configuration
public class ElasticSearchConfig {
	
    //常亮配置项 在调用es操作的时候直接引用这个常量
    public static final RequestOptions COMMON_OPTIONS;
    static {
        RequestOptions.Builder builder = RequestOptions.DEFAULT.toBuilder();
        //加密内容
//        builder.addHeader("Authorization","Bearer"+TOKEN );
//        builder.setHttpAsyncResponseConsumerFactory(
//                new HttpAsyncResponseConsumerFactory
//                        .HeapBufferedResponseConsumerFactory(30*1024*1024*1024)
//        );
        COMMON_OPTIONS = builder.build();
    }


    //容器中引入client 调用es服务时，用这个client请求
    @Bean
    public RestHighLevelClient esRestClient(){
          //多个es的写法
//        RestHighLevelClient client = new RestHighLevelClient(
//                RestClient.builder(
//                        //多个es     new HttpHost("192.168.31.120",9200,"http"),
//                        new HttpHost("192.168.31.125",9200,"http")));
//        return client;
        RestClientBuilder builder = null;
        builder = RestClient.builder(new HttpHost("192.168.31.125",9200,"http"));
        RestHighLevelClient client = new RestHighLevelClient(builder);
        return client;
    }
}
单元测试
@RunWith(SpringRunner.class)
@SpringBootTest
public class GulimallSearchApplicationTests {

	@Autowired
	private RestHighLevelClient client;
    	@Test
	public void contextLoads() {
		System.out.println(client);
	}
}


2021-11-05 15:44:39.332  INFO 2108 --- [           main] c.a.g.s.GulimallSearchApplicationTests   : Started GulimallSearchApplicationTests in 19.746 seconds (JVM running for 21.598)
org.elasticsearch.client.RestHighLevelClient@342e690b
2021-11-05 15:44:39.690  INFO 2108 --- [       Thread-9] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService 'applicationTaskExecutor'

Process finished with exit code 0

看到client的打印信息：org.elasticsearch.client.RestHighLevelClient@342e690b

整合成功

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