Elasticsearch ---- java operating ES

Project Creation

Add dependent

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
            <version>2.1.7.RELEASE</version>
        </dependency>
<!--        <dependency>-->
<!--            <groupId>org.elasticsearch</groupId>-->
<!--            <artifactId>elasticsearch</artifactId>-->
<!--            <version>6.2.1</version>-->
<!--        </dependency>-->
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-high-level-client</artifactId>
            <version>6.2.1</version>
        </dependency>

 

use

1, application configuration

Xuecheng: 
  elasticsearch: 
    the hostlist: $ {eshostlist: 127.0.0.1: 9200} # plurality of intermediate nodes separated by commas

2, the configuration Elasticsearch

• A client can use, we use restHighLevelClient

@Configuration 
public class ElasticsearchConfig { 

    @Value ( "xuecheng.elasticsearch.hostlist $ {}") 
    Private String hostlist; 

    @SuppressWarnings ( "All") 
    @Bean 
    public RestHighLevelClient restHighLevelClient () { 
        // parse hostlist configuration 
        String [] split = hostlist.split ( ","); 
        // Create HttpHost array, wherein the configuration information is stored in the host and port es 
        HttpHost [] = new new httpHostArray HttpHost [split.length]; 
        for (int I = 0; I <split.length; ++ I) { 
            String = Split Item [I]; 
            httpHostArray [I] = new new HttpHost (item.split ( ":") [0], the Integer.parseInt (item.split ( ":") [. 1]), "HTTP "); 
        } 
        // Create RestHighLevelClient client
        new new RestHighLevelClient return (RestClient.builder (httpHostArray)); 
    } 

    // projects primarily RestHighLevelClient, for the client being not lower 
    @SuppressWarnings ( "All") 
    @Bean 
    public RestClient RESTClient () { 
        // parse the configuration information hostlist 
        String [ ] = hostlist.split Split ( ","); 
        // Create HttpHost array where host and port es store configuration information 
        HttpHost [] = new new httpHostArray HttpHost [split.length]; 
        for (int I = 0; I <Split .length; I ++) { 
            String = Split Item [I]; 
            httpHostArray [I] = new new HttpHost (item.split ( ":") [0], the Integer.parseInt (item.split ( ":") [. 1]) , "HTTP"); 
        } 
        return RestClient.builder (httpHostArray) .build ();
    }

}

3, the test

@SpringBootTest 
@RunWith (SpringRunner.class) 
public class TestIndex { 

    @Autowired 
    RestHighLevelClient Client; 
　　 
　　 // test is not used RESTClient 
    @Autowired 
    RestClient RESTClient; 

    // create an index Library 
    @Test 
    public void testCreateIndex () throws IOException { 
        // create an index object 
        = new new CreateIndexRequest createIndexRequest CreateIndexRequest ( "xc_course"); 
        // set parameters 
        createIndexRequest.settings (Settings.builder () PUT ( "number_of_shards", ". 1") PUT ( "number_of_replicas", "0")..); 
        // specify the mapping 
        createIndexRequest.mapping ( "DOC", "{\ n-" + 
                "\"properties\": {\n" +
                "        \"name\": {\n" +
                "            \"type\": \"text\"\n" +
                "        },\n" +
                "        \"description\": {\n" +
                "            \"type\": \"text\"\n" +
                "        },\n" +
                "        \"studymodel\": {\n" +
                "            \"type\": \"keyword\"\n" +
                "        },\n" +
                "        \"pic\":{\n" +
                "        \t\"type\":\"text\"\n"+ 
        // index client operation
                "}", XContentType.JSON);
                "} \ n-" +
                "} \ N-" +
        // create an index Library execution
        IndicesClient indices = client.indices (); 
        CreateIndexResponse createIndexResponse = indices.create (createIndexRequest); 
        // get a response 
        Boolean Acknowledged createIndexResponse.isAcknowledged = (); 
        System.out.println (Acknowledged); 
    } 

    // delete the index database 
    @Test 
    public testDeleteIndex void () throws IOException { 
        // remove an indexed object 
        DeleteIndexRequest deleteIndexRequest = new DeleteIndexRequest ( "xc_course "); 
        client operation // index 
        IndicesClient indices client.indices = (); 
        // delete the index 
        DeleteIndexResponse delete = indices.delete (deleteIndexRequest); 
        // get a response 
        boolean = Acknowledged the delete. isAcknowledged (); 
        System.out.println (Acknowledged); 

    } 

    // add documents 
    @Test 
    public void testAddDoc () throws IOException { 
        // document content 
        // prepare json data 
        Map <String, Object> jsonMap = HashMap new new <> (); 
        jsonMap.put ( "name", "Cloud combat the Spring"); 
        jsonMap.put ( "the Description", "this course is to explain in four chapters: 1. micro services architecture Getting 2.spring . Basics cloud 3. combat Spring Boot 4. registration Center Eureka "); 
        jsonMap.put (" studymodel "," 201001 "); 
        jsonMap.put (" PIC "," HTTP: //xx/xx/abd.png "); 
        // = the SimpleDateFormat the dateFormat the SimpleDateFormat new new (" the mM-dd-YYYY HH: mm:ss");
        //jsonMap.put("timestamp ", dateFormat.format (new new a Date ()));  ()));
        // create index create objects 
        IndexRequest indexRequest = new new IndexRequest ( "xc_course", "DOC"); 
        // document content
        indexRequest.source (jsonMap); 
        request for http // by Client 
        IndexResponse indexResponse = client.index (indexRequest); 
        DocWriteResponse.Result Result indexResponse.getResult = (); 
        System.out.println (Result); 

    } 

    // query document 
    @Test 
    public void testGetDoc () throws IOException { 
        // query request object 
        GetRequest getRequest = new GetRequest ( "xc_course ", "doc", "jxhqfW4B7IA_qgGLOu2z"); 
        GetResponse getResponse = client.get (getRequest); 
        // get the contents of the document 
        Map <String, Object> sourceAsMap = getResponse.getSourceAsMap (); 
        System.out.println (sourceAsMap); 
    } 

    // update document (partial update) 
    @Test 
    public void updateDoc () throws IOException {
        UpdateRequest updateRequest = new UpdateRequest("xc_course", "doc", "jxhqfW4B7IA_qgGLOu2z");
        Map<String, String> map = new HashMap<>();
        map.put("name", "spring");
        updateRequest.doc(map);
        UpdateResponse update = client.update(updateRequest);
        RestStatus status = update.status();
        System.out.println(status);
    }

    //根据id删除文档
    @Test
    public void testDelDoc() throws IOException {
        //删除文档id
        String id = "jxhqfW4B7IA_qgGLOu2z";
        //删除索引请求对象
        DeleteRequest deleteRequest = new DeleteRequest("xc_course", "doc", id);
        // response object 
        DeleteResponse DeleteResponse = client.delete (DeleteRequest); 
        // get the response result 
        DocWriteResponse.Result deleteResponse.getResult Result = (); 
        System.out.println (Result); 
    } 
}