ELK第五篇:使用JavaAPI6.0.0操作-DocumentAPIs

待我称王封你为后i 2022-06-03 23:14 95阅读 0赞

# 说明 #

1、TransportClient  
2、JestClient  
3、RestClient

还有种是2.3中有的NodeClient,在5.5.1之后就没有了。还有种是spring-data-elasticsearch

elasticsearch安装的不同服务器版本使用的JavaAPI也需要和其版本相对应，因为它的每个版本的API变动太大，并且不支持向前兼容，最好是直接使用相对应的版本。  
本文相对应的版本是  
elasticsearch6.0.0

**7.0中TransportClient警告**  
We plan on deprecating the TransportClient in Elasticsearch 7.0 and removing it completely in 8.0. Instead, you should be using the Java High Level REST Client, which executes HTTP requests rather than serialized Java requests. The migration guide describes all the steps needed to migrate.  
我们计划在Elasticsearch 7.0中弃用TransportClient并在8.0中完全删除它。 相反，您应该使用Java高级别REST客户端，它执行HTTP请求而不是序列化的Java请求。 迁移指南介绍了迁移所需的所有步骤。【更新时间：2019-05-24，感谢评论区用户名guofangyao的提醒】  
**因此推荐后面直接使用REST方式进行调用，不在推荐TransportClient方式**

# maven #

引入相关的依赖：  
看清楚版本号要对应，否则会报错，特别是对client的链接

<dependency>  
                <groupId>org.elasticsearch</groupId>  
                <artifactId>elasticsearch</artifactId>  
                <version>6.0.0</version>
            </dependency>
            <dependency>  
                <groupId>org.elasticsearch.client</groupId>  
                <artifactId>transport</artifactId>  
                <version>6.0.0</version>
            </dependency>    
            <dependency>  
                <groupId>com.alibaba</groupId>
    			<artifactId>fastjson</artifactId>
                <version>1.2.8</version>  
    		</dependency>

# java使用API #

import java.io.IOException;
    import java.net.InetAddress;
    import java.util.Date;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.UUID;
    import java.util.concurrent.ExecutionException;
    import java.util.concurrent.TimeUnit;
    
    import org.elasticsearch.action.bulk.BackoffPolicy;
    import org.elasticsearch.action.bulk.BulkProcessor;
    import org.elasticsearch.action.bulk.BulkProcessor.Listener;
    import org.elasticsearch.action.bulk.BulkRequest;
    import org.elasticsearch.action.bulk.BulkRequestBuilder;
    import org.elasticsearch.action.bulk.BulkResponse;
    import org.elasticsearch.action.delete.DeleteRequest;
    import org.elasticsearch.action.delete.DeleteResponse;
    import org.elasticsearch.action.get.GetResponse;
    import org.elasticsearch.action.get.MultiGetItemResponse;
    import org.elasticsearch.action.get.MultiGetResponse;
    import org.elasticsearch.action.index.IndexRequest;
    import org.elasticsearch.action.index.IndexResponse;
    import org.elasticsearch.action.update.UpdateRequest;
    import org.elasticsearch.action.update.UpdateResponse;
    import org.elasticsearch.client.Client;
    import org.elasticsearch.client.transport.TransportClient;
    import org.elasticsearch.common.settings.Settings;
    import org.elasticsearch.common.transport.TransportAddress;
    import org.elasticsearch.common.unit.ByteSizeUnit;
    import org.elasticsearch.common.unit.ByteSizeValue;
    import org.elasticsearch.common.unit.TimeValue;
    import org.elasticsearch.common.xcontent.XContentFactory;
    import org.elasticsearch.script.Script;
    import org.elasticsearch.transport.client.PreBuiltTransportClient;
    
    /***********
     * 
     * 版本elasticsearch6.0.0
     * Document APIs的使用
     * 
     * @author bamboo
     *
     */
    public class ElkMain {
    
    	
    	private static TransportClient client;
    	
    	 public static void getClient() {
    		// TODO Auto-generated method stub
    		 try {  
    		      
    		      //设置集群名称  
    		  
    		      Settings settings = Settings.builder().put("cluster.name", "my-application").build();  
    		      //创建client  
    		      //@SuppressWarnings("resource")  
    		      client = new PreBuiltTransportClient(settings)  
    		              .addTransportAddress(new TransportAddress(InetAddress.getByName("192.168.0.91"), 9300));  
    		      
    		      
    		      //写入数据  
    		     // createDate(client);  
    		      //搜索数据  
    //		      GetResponse response = client.prepareGet("accounts", "person", "1").execute().actionGet();  
    //		      //输出结果  
    //		      System.out.println(response.getSource());  
    		        
    		      //关闭client  
    		      //client.close();  
    		  } catch (Exception e) {  
    		      e.printStackTrace();  
    		  }  
    	}
    	
    	
    	
    	
    	/** 
    	   * 插入单条数据 
    	   * {"account_number":44,"balance":34487,"firstname":"Aurelia","lastname":"Harding","age":37,"gender":"M","address":"502 Baycliff Terrace","employer":"Orbalix","email":"aureliaharding@orbalix.com","city":"Yardville","state":"DE"}
    
    	   * @param client 
    	   */  
       public static void addDate(){
        Map<String,Object> map = new HashMap<String, Object>();  
        map.put("account_number", 45);  
        map.put("balance", 34487);  
        map.put("firstname", "Aurelia");  
        map.put("lastname", "Harding");  
        map.put("age", 37);  
        map.put("gender","M");  
        map.put("address","浙江省杭州市江干区人民公园中国梦");  
        map.put("gender","M");  
        map.put("employer","小李");
        map.put("email","aureliaharding@orbalix.com");
        map.put("city","Yardville");
        map.put("state","DE");  
        
        
        try {  
    	    //json格式
        	// String json=JSON.toJSONString(map);
        	//IndexResponse response = client.prepareIndex("accounts", "person","47").setSource(json, XContentType.JSON).get();
    	   //map格式
            IndexResponse response = client.prepareIndex("accounts", "person","45")  //UUID.randomUUID().toString()
                       .setSource(map).execute().actionGet();  
            System.out.println(response.toString());  
            System.out.println("写入数据结果=" + response.status().getStatus() + "！id=" + response.getId());  
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
       } 
    	
       
       
       
       //获取单条数据
       public static void getDataByID(String id) {
    		// TODO Auto-generated method stub
    		 try {  
    		      
    		      //搜索数据  
    		      GetResponse response = client.prepareGet("accounts", "person", id).execute().actionGet();  
    		      //输出结果  
    		      System.out.println(response.getSource());  
    		        
    		      //关闭client  
    		      //client.close();  
    		  } catch (Exception e) {  
    		      e.printStackTrace();  
    		  }  
    	}
       
       /**
        * 删除单条记录 delete api
        * 
        */
       public static void deleteById(String id) {
           DeleteResponse response = client.prepareDelete("accounts", "person", id)
                   .get();
           String index = response.getIndex();
           String type = response.getType();
           String rid = response.getId();
           long version = response.getVersion();
           System.out.println(response.toString());  
           System.out.println(index + " : " + type + ": " + rid + ": " + version);
       }
    	
       
       
       
       /**
        * 测试更新 update API
        * 使用 updateRequest 对象
        * @throws Exception 
        */
       public static void update(String id)  {
    		UpdateRequest updateRequest = new UpdateRequest();
          
          //client.prepareUpdate("accounts", "person", "1")和下面相同
    //	       updateRequest.index("accounts");
    //	       updateRequest.type("person");
    //	       updateRequest.id(id);
    //	       updateRequest.doc(XContentFactory.jsonBuilder()
    //	               .startObject()
    //	               // 对没有的字段添加, 对已有的字段替换
    //	               .field("employer", "小李子22")
    //	                .field("gender", "M")
    //	               .endObject());		
     //UpdateResponse response = client.update(updateRequest).get();
          
          // 使用Script对象进行更新
    //    UpdateResponse response = client.prepareUpdate("accounts", "person", id)
    //		     .setScript(new Script("ctx._source.employer = \"小李子22\""))
    //		     .get();
        
        // 使用XContFactory.jsonBuilder() 进行更新
         UpdateResponse response = null;
    		try {
    			response = client.prepareUpdate("accounts", "person", id)
    			         .setDoc(XContentFactory.jsonBuilder()
    			                 .startObject()
    			                     .field("employer", "小李子333")
    			                 .endObject()).get();
    		} catch (IOException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
        
        // 使用updateRequest对象及script
    //     UpdateRequest updateRequest = new UpdateRequest("accounts", "person", id)
    //             .script(new Script("ctx._source.gender=\"male\""));
    //     UpdateResponse response = client.update(updateRequest).get();
          
          
         
          
          // 打印
          String index = response.getIndex();
          String type = response.getType();
          String rid = response.getId();
          long version = response.getVersion();
          System.out.println(response.toString());  
          System.out.println(index + " : " + type + ": " + rid + ": " + version);
       }
       
       
       /**
       * 测试upsert方法
       * 查询条件, 查找不到则添加生效
       * @throws Exception 
       * 
       */
      public static void upSet(String id) {
          try {
    		// 设置查询条件, 查找不到则添加生效
    		  IndexRequest indexRequest = new IndexRequest("accounts", "person", id)
    		      .source(XContentFactory.jsonBuilder()
    		          .startObject()
    		              .field("name", "qergef")
    		              .field("gender", "malfdsae")
    		          .endObject());
    		  // 设置更新, 查找到更新下面的设置
    		  UpdateRequest upSet = new UpdateRequest("accounts", "person", id)
    		      .doc(XContentFactory.jsonBuilder()
    		              .startObject()
    		                  .field("user", "wenbronk")
    		              .endObject())
    		      .upsert(indexRequest);
    		  
    		  client.update(upSet).get();
    	} catch (IOException e) {
    		// TODO Auto-generated catch block
    		e.printStackTrace();
    	} catch (InterruptedException e) {
    		// TODO Auto-generated catch block
    		e.printStackTrace();
    	} catch (ExecutionException e) {
    		// TODO Auto-generated catch block
    		e.printStackTrace();
    	}
          
          
      }
      
       /**
       * 测试multi get api
       * 从不同的index, type, 和id中获取
       */ 
      public static void testMultiGet() {
          MultiGetResponse multiGetResponse = client.prepareMultiGet()
          .add("twitter", "tweet", "1")
          .add("accounts", "person",  "6", "13", "18")//因为我数据里面刚好有这几个ID,根据你自己的情况设置
          .add("index", "type", "foo")
          .get();
          
          for (MultiGetItemResponse itemResponse : multiGetResponse) {
              GetResponse response = itemResponse.getResponse();
              if (response!=null&&response.isExists()) {
                  String sourceAsString = response.getSourceAsString();
                  System.out.println(sourceAsString);
              }
          }
      }
      
      
      
      
      
      /**
       * bulk 批量执行
       * 一次查询可以update 或 delete多个document
       */
      public static void testBulk()  {
          try {
    		BulkRequestBuilder bulkRequest = client.prepareBulk();
    		  bulkRequest.add(client.prepareIndex("accounts", "person", "50")
    		          .setSource(XContentFactory.jsonBuilder()
    		                  .startObject()
    		                      .field("user", "kimchy")
    		                      .field("postDate", new Date())
    		                      .field("message", "trying out Elasticsearch")
    		                  .endObject()));
    		  bulkRequest.add(client.prepareIndex("accounts", "person", "51")
    		          .setSource(XContentFactory.jsonBuilder()
    		                  .startObject()
    		                      .field("user", "kimchy")
    		                      .field("postDate", new Date())
    		                      .field("message", "another post")
    		                  .endObject()));
    		  BulkResponse response = bulkRequest.get();
    		  System.out.println(response.toString());
    	} catch (IOException e) {
    		// TODO Auto-generated catch block
    		e.printStackTrace();
    	}
      }
       
      
      
      /**
       * 使用bulk processor
       * @throws Exception 
       */
      public static void testBulkProcessor() throws Exception {
          // 创建BulkPorcessor对象
          BulkProcessor bulkProcessor = BulkProcessor.builder(client, new Listener() {
    
    		@Override
    		public void beforeBulk(long executionId, BulkRequest request) {
    			// TODO Auto-generated method stub
    			
    		}
    
    		@Override
    		public void afterBulk(long executionId, BulkRequest request,
    				BulkResponse response) {
    			// TODO Auto-generated method stub
    			
    		}
    
    		@Override
    		public void afterBulk(long executionId, BulkRequest request,
    				Throwable failure) {
    			// TODO Auto-generated method stub
    			
    		}
             
          })
          // 1w次请求执行一次bulk
          .setBulkActions(10000)
          // 1gb的数据刷新一次bulk
          .setBulkSize(new ByteSizeValue(1, ByteSizeUnit.GB))
          // 固定5s必须刷新一次
          .setFlushInterval(TimeValue.timeValueSeconds(5))
          // 并发请求数量, 0不并发, 1并发允许执行
          .setConcurrentRequests(1)
          // 设置退避, 100ms后执行, 最大请求3次
          .setBackoffPolicy(
                  BackoffPolicy.exponentialBackoff(TimeValue.timeValueMillis(100), 3))
          .build();
          
          // 添加单次请求
          bulkProcessor.add(new IndexRequest("accounts", "person", "50"));
          bulkProcessor.add(new DeleteRequest("accounts", "person", "51"));
          
          // 关闭
          bulkProcessor.awaitClose(10, TimeUnit.MINUTES);
          // 或者
          bulkProcessor.close();
      }
       
    	public static void main(String[] args) throws Exception {
    		// TODO Auto-generated method stub
    		getClient();
    		//addDate();
    		//getDataByID("44");
    		//deleteById("45");
    //		update("44");
    //		getDataByID("44");
    		
    //		upSet("46");//查找设置
    //		getDataByID("46");
    		
    //		testMultiGet();
    		
    		//testBulk();//批量执行
    		//getDataByID("51");
    		
    		
    		testBulkProcessor();//批量处理,少于1w次不会执行
    		getDataByID("51");
    		
    	}
    
    }

# 参考文档 #

[官方API6.0.0文档中文版本][API6.0.0]  
Java API \[6.0\] » Document APIs  
[https://www.elastic.co/guide/en/elasticsearch/client/java-api/current/java-docs.html][https_www.elastic.co_guide_en_elasticsearch_client_java-api_current_java-docs.html]

[API6.0.0]: https://www.elastic.co/guide/cn/elasticsearch/guide/current/index.html
[https_www.elastic.co_guide_en_elasticsearch_client_java-api_current_java-docs.html]: https://www.elastic.co/guide/en/elasticsearch/client/java-api/current/java-docs.html