Java操作ElasticSearch

# ##java客户端连接到ElasticSearch服务器

创建maven工程 添加坐标 最好跟服务器elasticsearch一致

<dependency>
     <groupId>org.elasticsearch.client</groupId>
     <artifactId>transport</artifactId>
     <version>6.2.4</version>
</dependency>
<dependency>
　　  <groupId>net.sf.json-lib</groupId>
　　　<artifactId>json-lib</artifactId>
　　　<version>2.4</version>
　　　<classifier>jdk15</classifier>
</dependency>

# ## 获取TransportClient

java程序连接elasticsearch通过TransportClient类 

TransportClient类是一个抽象类  具体的实现是PreBulitTransportClient  

public class TestEs { private static String host="192.168.88.133"; // 服务器地址 private static int port=9300; // 端口 /** * 创建客户端连接到elasticsearch服务器 */   @Test      
      public void teseConnection() throws Exception{
            TransportClient client = new PreBuiltTransportClient(Settings.EMPTY);
            client .addTransportAddress(new TransportAddress(InetAddress.getByName(TestEs.host), TestEs.port));
            System.out.println(client);
            client.close();
        } }

public class TestEs {

      private static String host="192.168.88.133"; // 服务器地址
      private static int port=9300; // 端口
      private TransportClient client=null;
        
         /**
         * 获取连接
         * @return
         */
        @Before
        public void getCient()throws Exception{
             client = new PreBuiltTransportClient(Settings.EMPTY)
                       .addTransportAddress(new TransportAddress(InetAddress.getByName(TestEs.host), TestEs.port));
            System.out.println(client);
        }
         
        /**
         * 关闭连接
         * @param client
         */
        @After
        public void close(){
            if(client!=null){
                client.close();
            }
        }
         
        /**
         * 添加索引
         */
        @Test
        public void testAdd()throws Exception{
            IndexResponse response =client.prepareIndex("hello", "es", "1")
                .setSource(XContentFactory.jsonBuilder()
                        .startObject()
                        .field("name", "zhangsan")
                        .field("birthday", new Date())
                        .field("age", 20)
                    .endObject()
                        )
                .get();
            System.out.println("索引名称："+response.getIndex());
            System.out.println("类型："+response.getType());
            System.out.println("文档ID："+response.getId()); // 第一次使用是1
            System.out.println("当前实例状态："+response.status());
        }
         
}

ElasticSearch提供了根据索引名称，类别，文档ID来获取数据

　　　　 @Test
        public void testGet(){
            GetResponse getResponse=client.prepareGet("hello", "es", "1").get();
            System.out.println(getResponse.getSourceAsString());
        }

ElasticSearch提供了根据索引名称 类别 文档ID来修改数据 修改的设置数据可以是Map son串等

　　 @Test
    public void testUpdate() {
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("name", "lisi");
        map.put("birthday", new Date());
        map.put("age", "25");
        UpdateResponse response = client.prepareUpdate("hello", "es", "1").setDoc(map).get();
        System.out.println("索引名称：" + response.getIndex());
        System.out.println("类型：" + response.getType());
        System.out.println("文档ID：" + response.getId()); // 第一次使用是1
        System.out.println("当前实例状态：" + response.status());
    }

ElasticSearch提供了根据索引名称 类别 文档ID来删除数据

　　@Test
    public void testDelete(){
        DeleteResponse response=client.prepareDelete("hello", "es", "1").get();
        System.out.println("索引名称："+response.getIndex());
        System.out.println("类型："+response.getType());
        System.out.println("文档ID："+response.getId()); // 第一次使用是1
        System.out.println("当前实例状态："+response.status());
    }