Elasticsearch----java操作ES

项目创建

添加依赖

        <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>

使用

1、application配置

xuecheng:
  elasticsearch:
    hostlist: ${eshostlist:127.0.0.1:9200} #多个结点中间用逗号分隔

2、配置Elasticsearch

• 使用一个client即可，我们使用restHighLevelClient

@Configuration
public class ElasticsearchConfig {

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

    @SuppressWarnings("all")
    @Bean
    public RestHighLevelClient restHighLevelClient(){
        //解析hostlist配置信息
        String[] split = hostlist.split(",");
        //创建HttpHost数组，其中存放es主机和端口的配置信息
        HttpHost[] httpHostArray = new HttpHost[split.length];
        for(int i=0;i<split.length;i++){
            String item = split[i];
            httpHostArray[i] = new HttpHost(item.split(":")[0], Integer.parseInt(item.split(":")[1]), "http");
        }
        //创建RestHighLevelClient客户端
        return new RestHighLevelClient(RestClient.builder(httpHostArray));
    }

    //项目主要使用RestHighLevelClient，对于低级的客户端暂时不用
    @SuppressWarnings("all")
    @Bean
    public RestClient restClient(){
        //解析hostlist配置信息
        String[] split = hostlist.split(",");
        //创建HttpHost数组，其中存放es主机和端口的配置信息
        HttpHost[] httpHostArray = new HttpHost[split.length];
        for(int i=0;i<split.length;i++){
            String item = split[i];
            httpHostArray[i] = new HttpHost(item.split(":")[0], Integer.parseInt(item.split(":")[1]), "http");
        }
        return RestClient.builder(httpHostArray).build();
    }

}

3、测试

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

    @Autowired
    RestHighLevelClient client;
　　 
　　 //测试中没有使用restClient
    @Autowired
    RestClient restClient;

    //创建索引库
    @Test
    public void testCreateIndex() throws IOException {
        //创建索引对象
        CreateIndexRequest createIndexRequest = new CreateIndexRequest("xc_course");
        //设置参数
        createIndexRequest.settings(Settings.builder().put("number_of_shards", "1").put("number_of_replicas", "0"));
        //指定映射
        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" +
                "        }\n" +
                "    }\n" +
                "}", XContentType.JSON);
        //操作索引的客户端
        IndicesClient indices = client.indices();
        //执行创建索引库
        CreateIndexResponse createIndexResponse = indices.create(createIndexRequest);
        //得到响应
        boolean acknowledged = createIndexResponse.isAcknowledged();
        System.out.println(acknowledged);
    }

    //删除索引库
    @Test
    public void testDeleteIndex() throws IOException {
        //删除索引对象
        DeleteIndexRequest deleteIndexRequest = new DeleteIndexRequest("xc_course");
        //操作索引的客户端
        IndicesClient indices = client.indices();
        //执行删除索引
        DeleteIndexResponse delete = indices.delete(deleteIndexRequest);
        //得到响应
        boolean acknowledged = delete.isAcknowledged();
        System.out.println(acknowledged);

    }

    //添加文档
    @Test
    public void testAddDoc() throws IOException {
        //文档内容
        //准备json数据
        Map<String, Object> jsonMap = new HashMap<>();
        jsonMap.put("name", "spring cloud实战");
        jsonMap.put("description", "本课程主要从四个章节进行讲解： 1.微服务架构入门 2.spring cloud 基础入门 3.实战Spring Boot 4.注册中心eureka。");
        jsonMap.put("studymodel", "201001");
        jsonMap.put("pic", "http://xx/xx/abd.png");
        //SimpleDateFormat dateFormat =new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        //jsonMap.put("timestamp", dateFormat.format(new Date()));
        //创建索引创建对象
        IndexRequest indexRequest = new IndexRequest("xc_course", "doc");
        //文档内容
        indexRequest.source(jsonMap);
        //通过client进行http的请求
        IndexResponse indexResponse = client.index(indexRequest);
        DocWriteResponse.Result result = indexResponse.getResult();
        System.out.println(result);

    }

    //查询文档
    @Test
    public void testGetDoc() throws IOException {
        //查询请求对象
        GetRequest getRequest = new GetRequest("xc_course", "doc", "jxhqfW4B7IA_qgGLOu2z");
        GetResponse getResponse = client.get(getRequest);
        //得到文档的内容
        Map<String, Object> sourceAsMap = getResponse.getSourceAsMap();
        System.out.println(sourceAsMap);
    }

    //更新文档（局部更新）
    @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);
        //响应对象
        DeleteResponse deleteResponse = client.delete(deleteRequest);
        //获取响应结果
        DocWriteResponse.Result result = deleteResponse.getResult();
        System.out.println(result);
    }
}