ElasticSearch 使用Java Api访问集群

ElasticSearch 使用Java Api访问集群

1、创建maven工程导入pom依赖

        
            org.elasticsearch.client
            transport
            6.1.1
        
        
            org.apache.logging.log4j
            log4j-core
            2.9.1
        
        
            junit
            junit
            4.12
        
    

2、创建索引

package cn.cheng.es.api;

import org.elasticsearch.action.bulk.BulkRequestBuilder;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.rest.RestStatus;
import org.elasticsearch.transport.client.PreBuiltTransportClient;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

public class CreateIndex {
    private TransportClient client;
    private IndexResponse response;

    @Before
    public void init() throws UnknownHostException {
        Settings settings = Settings.builder().put("cluster.name", "myes").build();
        client = new PreBuiltTransportClient(settings)
                .addTransportAddress(new TransportAddress(InetAddress.getByName("node01"), 9300));
    }

    @Test
    /**
     * 使用json串创建索引
     */
    public void index1() throws UnknownHostException {
        String json = "{" +
                "\"user\":\"kimchy\"," +
                "\"postDate\":\"2013-01-30\"," +
                "\"message\":\"trying out Elasticsearch\"" +
                "}";
        response = client.prepareIndex("twitter", "doc", "100")
                .setSource(json, XContentType.JSON)
                .get();
    }

    @Test
    /**
     * 使用map对象创建索引
     */
    public void index2() throws UnknownHostException {
        Map json = new HashMap();
        json.put("user", "kimchy");
        json.put("postDate", new Date());
        json.put("message", "trying out Elasticsearch");

        response = client.prepareIndex("twitter", "doc", "200").setSource(json).get();
    }

    @Test
    /**
     * 使用jsonBuilder创建索引
     */
    public void index3() throws IOException {
        XContentBuilder builder = XContentFactory.jsonBuilder().startObject()
                .field("user", "kimchy")
                .field("postDate", new Date())
                .field("message", "trying out Elasticsearch")
                .endObject();
        response = client.prepareIndex("twitter", "doc", "300")
                .setSource(builder).get();
    }

    @After
    public void close() throws UnknownHostException {
        if (response != null) {
            String index = response.getIndex();
            String type = response.getType();
            String id = response.getId();
            long version = response.getVersion();
            RestStatus status = response.status();
            System.out.println("index " + index + "  type" + type + "" + id + "" + version + "" + version);
            System.out.println(status);
            client.close();
        }
    }

    /**
     * 批量插入数据
     *
     * @throws IOException
     */
    @Test
    public void index4() throws IOException {
        BulkRequestBuilder bulkRequest = client.prepareBulk();
        bulkRequest.add(client.prepareIndex("twitter", "doc", "400")
                .setSource(XContentFactory.jsonBuilder()
                        .startObject()
                        .field("user", "kimchy")
                        .field("postDate", new Date())
                        .field("message", "trying out Elasticsearch")
                        .endObject()
                )
        );
        bulkRequest.add(client.prepareIndex("twitter", "doc", "500")
                .setSource(XContentFactory.jsonBuilder()
                        .startObject()
                        .field("user", "kimchy")
                        .field("postDate", new Date())
                        .field("message", "another post")
                        .endObject()
                )
        );
        //执行插入操作
        BulkResponse bulkResponse = bulkRequest.get();
        if (bulkResponse.hasFailures()) {
            System.out.println("-------------------我失败了-----------------");
        }
    }
}

3、查询索引

package cn.cheng.es.api;

import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.get.MultiGetItemResponse;
import org.elasticsearch.action.get.MultiGetResponse;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.rest.RestStatus;
import org.elasticsearch.transport.client.PreBuiltTransportClient;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

public class QueryIndex {
    private TransportClient client;
    private GetResponse response;

    @Before
    public void init() throws UnknownHostException {
        Settings settings = Settings.builder().put("cluster.name", "myes").build();
        client = new PreBuiltTransportClient(settings)
                .addTransportAddress(new TransportAddress(InetAddress.getByName("node01"), 9300));
    }
    @Test
    public void get1() throws UnknownHostException {
        response = client.prepareGet("twitter", "doc", "1").get();
    }

    @Test
    public void get2() throws UnknownHostException {
        MultiGetResponse multiGetItemResponses = client.prepareMultiGet()
                .add("twitter", "doc", "100")
                .add("twitter", "doc", "200", "300", "400")
                .get();
        for (MultiGetItemResponse itemResponse : multiGetItemResponses) {
            GetResponse response = itemResponse.getResponse();
            if (response.isExists()) {
                String json = response.getSourceAsString();
                System.out.println(json);
            }
        }
    }

    @After
    public void close() throws UnknownHostException {
        if (response != null) {
            String index = response.getIndex();
            String type = response.getType();
            String id = response.getId();
            long version = response.getVersion();
            System.out.println("index " + index + "  type" + type + "" + id + "" + version + "" + version);
            client.close();
        }
    }
}

4、删除索引

package cn.cheng.es.api;

import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.delete.DeleteResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.reindex.BulkByScrollResponse;
import org.elasticsearch.index.reindex.BulkByScrollTask;
import org.elasticsearch.index.reindex.DeleteByQueryAction;
import org.elasticsearch.rest.RestStatus;
import org.elasticsearch.transport.client.PreBuiltTransportClient;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.net.InetAddress;
import java.net.UnknownHostException;

public class DeleteIndex {
    private TransportClient client;
    private DeleteResponse response;

    @Before
    public void init() throws UnknownHostException {
        Settings settings = Settings.builder().put("cluster.name", "myes").build();
        client = new PreBuiltTransportClient(settings)
                .addTransportAddress(new TransportAddress(InetAddress.getByName("node01"), 9300));
    }

    @After
    public void close() throws UnknownHostException {
        if(response!=null) {
            String index = response.getIndex();
            String type = response.getType();
            String id = response.getId();
            long version = response.getVersion();
            System.out.println("index " + index + "  type" + type + "" + id + "" + version + "" + version);
            RestStatus status = response.status();
            System.out.println("status:" + status.getStatus());
            client.close();
        }
    }

    /**
     * 根据文档进行删除
     * @throws UnknownHostException
     */
    @Test
    public void delete1() throws UnknownHostException {
        response = client.prepareDelete("twitter", "doc", "100").get();
    }
    @Test
    /**
     * 根据根据查询结果删除数据，并触发相关事件
     */
    public void delete2() throws UnknownHostException {
        DeleteByQueryAction.INSTANCE.newRequestBuilder(client)
                .filter(QueryBuilders.matchQuery("gender", "male"))
                .source("twitter")
                .execute(new ActionListener() {
                    public void onResponse(BulkByScrollResponse response) {
                        long deleted = response.getDeleted();
                        System.out.println("---------------"+deleted);
                    }
                    public void onFailure(Exception e) {
                        System.out.println("------------错误了");
                    }
                });
    }
}