（18）ElasticSearch java项目中的增删查改基本操作

　　新建索引，名称index1、类型blog、title与content用中文分词器

PUT /index1
{
  "settings": {
    "number_of_shards": 3,
    "number_of_replicas": 0
  },
  "mappings": {
    "blog":{
      "properties": {
        "id":{
          "type":"long"
        },
        "title":{
          "type": "text",
          "analyzer": "ik_max_word"
        },
        "content":{
          "type":"text",
          "analyzer": "ik_max_word"
        },
        "postdate":{
          "type":"date"
        },
        "url":{
          "type":"text"
        }
      }
    }
  }
}

View Code

　　1、增加文档

　　@Test
    public void testAdd() throws IOException {
        //指定集群
        Settings settings = Settings.builder().put("cluster.name","my-application").build(); 
        //创建客户端
        TransportClient client = new PreBuiltTransportClient(settings)
                                    .addTransportAddress(new TransportAddress(InetAddress.getByName("192.168.43.151"),9300));
        //创建文档
　　　　XContentBuilder doc = XContentFactory.jsonBuilder()
                              .startObject()
                              .field("id","1")
                              .field("title","java设计模式之装配模式")
                              .field("content","在不必改变原类文件和使用继承的情况下，动态的扩展一个对象的功能")
                              .field("postdate","2018-05-20")
                              .field("url","csdn.net/79239027")
                              .endObject();
　　　　//增加文档并返回结果
        IndexResponse response = client.prepareIndex("index1","blog","10").setSource(doc).get();
　　　　//如果执行成功输出CREATED
        System.out.println(response.status());
        client.close();                        
    }

　　2、查询文档

　　 @Test
    public void testQuery() throws UnknownHostException {
        //指定集群
        Settings settings = Settings.builder().put("cluster.name","my-application").build(); 
        //创建客户端
        TransportClient client = new PreBuiltTransportClient(settings)
                                    .addTransportAddress(new TransportAddress(InetAddress.getByName("192.168.43.151"),9300));
        //查询并返回结果，查询条件：索引是index1，类型是blog，id是10的数据
        GetResponse response = client.prepareGet("index1","blog","10").execute().actionGet();
        //输出json字符串，没有则输出null
        System.out.println(response.getSourceAsString());
        client.close();//关闭客户端
    }
    

　　3、删除文档

　　 @Test
    public void testDelete() throws IOException {
        //指定集群
        Settings settings = Settings.builder().put("cluster.name","my-application").build(); 
        //创建客户端
        TransportClient client = new PreBuiltTransportClient(settings)
                                    .addTransportAddress(new TransportAddress(InetAddress.getByName("192.168.43.151"),9300));
        //删除文档并返回结果
        DeleteResponse response = client.prepareDelete("index1","blog","10").get();
        //如果删除成功输出OK,不存在输出NOT_FOUND
        System.out.println(response.status());
        client.close();
                              
    }

 　　4、修改文档

　　@Test
   public void testUpdate() throws IOException, InterruptedException, ExecutionException {
       //指定集群
       Settings settings = Settings.builder().put("cluster.name","my-application").build(); 
       //创建客户端
       TransportClient client = new PreBuiltTransportClient(settings)
                                    .addTransportAddress(new TransportAddress(InetAddress.getByName("192.168.43.151"),9300));
       

　　　　  //创建文档
　　　　  XContentBuilder doc = XContentFactory.jsonBuilder()
                                              .startObject()
                                              .field("title","单例设计模式")
                                              .endObject();

　　　　  //更新文档请求
　　　　  UpdateRequest request = new UpdateRequest();
　　　　  //指定更新文档的id
         request.index("index1").type("blog").id("10").doc(doc);
         //执行操作并返回结果
         UpdateResponse response = client.update(request).get();
         //输出结果,OK，否则程序直接报错
         System.out.println(response.status());
         client.close();

   }

　　6、如果存在则更新，不存在则增加

@Test
public void testUpset() throws IOException, InterruptedException, ExecutionException {
//指定集群
Settings settings = Settings.builder().put("cluster.name","my-application").build();
//创建客户端
TransportClient client = new PreBuiltTransportClient(settings)
.addTransportAddress(new TransportAddress(InetAddress.getByName("192.168.43.151"),9300));
//创建新增文档
XContentBuilder doc = XContentFactory.jsonBuilder()
.startObject()
.field("id","2")
.field("title","工厂模式")
.field("content","静态工厂，实例工厂。")
.field("postdate","2018-05-20")
.field("url","csdn.net/79239027")
.endObject();

//创建更新文档
XContentBuilder doc2 = XContentFactory.jsonBuilder()
.startObject()
.field("title","设计模式")
.endObject();
//指定新增的位置
IndexRequest request1 = new IndexRequest("index1","blog","8").source(doc);
//创建更新请求
UpdateRequest request2 = new UpdateRequest("index1","blog","8").doc(doc2).upsert(request1);
//执行并返回结果
UpdateResponse response = client.update(request2).get();
//输出结果,OK
System.out.println(response.status());
}

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