ElasticSearch 搜索原理

 

 

 

运行结果:返回5条数据

 参考代码ESTestDocumentAPI.java

package com.dajiangtai.djt_spider.elasticsearch;

import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import static org.elasticsearch.node.NodeBuilder.*;
import static org.elasticsearch.common.xcontent.XContentFactory.*;
import org.elasticsearch.action.bulk.BackoffPolicy;
import org.elasticsearch.action.bulk.BulkProcessor;
import org.elasticsearch.common.unit.ByteSizeUnit;
import org.elasticsearch.common.unit.ByteSizeValue;
import org.elasticsearch.common.unit.TimeValue;
import org.codehaus.jackson.map.ObjectMapper;
import org.elasticsearch.action.bulk.BulkItemResponse;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.bulk.BulkRequestBuilder;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.delete.DeleteRequestBuilder;
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.IndexRequestBuilder;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.action.search.SearchType;
import org.elasticsearch.action.update.UpdateRequest;
import org.elasticsearch.client.Client;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.node.Node;
import org.elasticsearch.script.Script;
import org.elasticsearch.script.ScriptService;
import org.elasticsearch.search.SearchHits;
import org.junit.Before;
import org.junit.Test;

/**
 * Document API 操作
 * 
 * @author 大讲台
 * 
 */
public class ESTestDocumentAPI {
    private TransportClient client;

    @Before
    public void test0() throws UnknownHostException {

        // 开启client.transport.sniff功能，探测集群所有节点
        Settings settings = Settings.settingsBuilder()
                .put("cluster.name", "escluster")
                .put("client.transport.sniff", true).build();
        // on startup
        // 获取TransportClient
        client = TransportClient
                .builder()
                .settings(settings)
                .build()
                .addTransportAddress(
                        new InetSocketTransportAddress(InetAddress
                                .getByName("master"), 9300))
                .addTransportAddress(
                        new InetSocketTransportAddress(InetAddress
                                .getByName("slave1"), 9300))
                .addTransportAddress(
                        new InetSocketTransportAddress(InetAddress
                                .getByName("slave2"), 9300));
    }

    /**
     * 创建索引：use ElasticSearch helpers
     * 
     * @throws IOException
     */
    @Test
    public void test1() throws IOException {
        IndexResponse response = client
                .prepareIndex("twitter", "tweet", "1")
                .setSource(
                        jsonBuilder().startObject().field("user", "kimchy")
                                .field("postDate", new Date())
                                .field("message", "trying out Elasticsearch")
                                .endObject()).get();
        System.out.println(response.getId());
        client.close();
    }

    /**
     * 创建索引：do it yourself
     * 
     * @throws IOException
     */
    @Test
    public void test2() throws IOException {
        String json = "{" + ""user":"kimchy","
                + ""postDate":"2013-01-30","
                + ""message":"trying out Elasticsearch"" + "}";
        IndexResponse response = client.prepareIndex("twitter", "tweet")
                .setSource(json).get();
        System.out.println(response.getId());
        client.close();
    }

    /**
     * 创建索引：use map
     * 
     * @throws IOException
     */
    @Test
    public void test3() throws IOException {
        Map<String, Object> json = new HashMap<String, Object>();
        json.put("user", "kimchy");
        json.put("postDate", new Date());
        json.put("message", "trying out Elasticsearch");

        IndexResponse response = client.prepareIndex("twitter", "tweet")
                .setSource(json).get();
        System.out.println(response.getId());
        client.close();
    }

    /**
     * 创建索引：serialize your beans
     * 
     * @throws IOException
     */
    @Test
    public void test4() throws IOException {
        User user = new User();
        user.setUser("kimchy");
        user.setPostDate(new Date());
        user.setMessage("trying out Elasticsearch");

        // instance a json mapper
        ObjectMapper mapper = new ObjectMapper(); // create once, reuse

        // generate json
        byte[] json = mapper.writeValueAsBytes(user);

        IndexResponse response = client.prepareIndex("twitter", "tweet")
                .setSource(json).get();
        System.out.println(response.getId());
        client.close();
    }

    /**
     * 查询索引：get
     * 
     * @throws IOException
     */
    @Test
    public void test5() throws IOException {
        GetResponse response = client.prepareGet("twitter", "tweet", "1").get();
        System.out.println(response.getSourceAsString());

        client.close();
    }

    /**
     * 删除索引：delete
     * 
     * @throws IOException
     */
    @Test
    public void test6() throws IOException {
        client.prepareDelete("twitter", "tweet", "1").get();
        client.close();
    }

    /**
     * 更新索引：Update API-UpdateRequest
     * 
     * @throws IOException
     * @throws ExecutionException
     * @throws InterruptedException
     */
    @Test
    public void test7() throws IOException, InterruptedException,
            ExecutionException {
        UpdateRequest updateRequest = new UpdateRequest();
        updateRequest.index("twitter");
        updateRequest.type("tweet");
        updateRequest.id("AVyi3OORot7zkId708s8");
        updateRequest.doc(jsonBuilder().startObject().field("gender", "male")
                .endObject());
        client.update(updateRequest).get();
        System.out.println(updateRequest.version());
        client.close();
    }

    /**
     * 更新索引：Update API-prepareUpdate()-doc
     * 
     * @throws IOException
     * @throws ExecutionException
     * @throws InterruptedException
     */
    @Test
    public void test8() throws IOException, InterruptedException,
            ExecutionException {
        client.prepareUpdate("twitter", "tweet", "AVyikSKIot7zkId708s6")
                .setDoc(jsonBuilder().startObject().field("gender", "female")
                        .endObject()).get();
        client.close();
    }

    /**
     * 更新索引：Update API-prepareUpdate()-script
     * 需要开启：script.engine.groovy.inline.update: on
     * 
     * @throws IOException
     * @throws ExecutionException
     * @throws InterruptedException
     */
    @Test
    public void test9() throws IOException, InterruptedException,
            ExecutionException {
        client.prepareUpdate("twitter", "tweet", "AVyi4oZfot7zkId708s-")
                .setScript(
                        new Script("ctx._source.gender = "female"",
                                ScriptService.ScriptType.INLINE, null, null))
                .get();
        client.close();
    }

    /**
     * 更新索引：Update API-UpdateRequest-upsert
     * 
     * @throws IOException
     * @throws ExecutionException
     * @throws InterruptedException
     */
    @Test
    public void test10() throws IOException, InterruptedException,
            ExecutionException {
        IndexRequest indexRequest = new IndexRequest("twitter", "tweet", "1")
                                        .source(jsonBuilder()
                                        .startObject()
                                        .field("name", "Joe Smith")
                                        .field("gender", "male")
                                        .endObject());
        UpdateRequest updateRequest = new UpdateRequest("twitter", "tweet", "1")
                                        .doc(jsonBuilder()
                                        .startObject()
                                        .field("gender", "female")
                                        .endObject()).upsert(indexRequest);
        client.update(updateRequest).get();
        client.close();
    }
    
    /**
     * 批量查询索引：Multi Get API
     * 
     * @throws IOException
     * @throws ExecutionException
     * @throws InterruptedException
     */
    @Test
    public void test11() throws IOException, InterruptedException,
            ExecutionException {
        MultiGetResponse multiGetItemResponses = client.prepareMultiGet()
                .add("twitter", "tweet", "1")           
                .add("twitter", "tweet", "AVyi4oZfot7zkId708s-", "AVyi3OORot7zkId708s8", "AVyikSKIot7zkId708s6") 
                .add("djt2", "user", "1")          
                .get();

            for (MultiGetItemResponse itemResponse : multiGetItemResponses) { 
                GetResponse response = itemResponse.getResponse();
                if (response.isExists()) {                      
                    String json = response.getSourceAsString(); 
                    System.out.println(json);
                }
            }
        client.close();
    }
    
    /**
     * 批量操作索引：Bulk API
     * 
     * @throws IOException
     * @throws ExecutionException
     * @throws InterruptedException
     */
    @Test
    public void test12() throws IOException, InterruptedException,
            ExecutionException {
        BulkRequestBuilder bulkRequest = client.prepareBulk();

        // either use client#prepare, or use Requests# to directly build index/delete requests
        bulkRequest.add(client.prepareIndex("twitter", "tweet", "3")
                .setSource(jsonBuilder()
                            .startObject()
                                .field("user", "kimchy")
                                .field("postDate", new Date())
                                .field("message", "trying out Elasticsearch")
                            .endObject()
                          )
                );

        bulkRequest.add(client.prepareIndex("twitter", "tweet", "2")
                .setSource(jsonBuilder()
                            .startObject()
                                .field("user", "kimchy")
                                .field("postDate", new Date())
                                .field("message", "another post")
                            .endObject()
                          )
                );
        DeleteRequestBuilder prepareDelete = client.prepareDelete("twitter", "tweet", "AVyikSKIot7zkId708s6");
        bulkRequest.add(prepareDelete);
        
        
        BulkResponse bulkResponse = bulkRequest.get();
        //批量操作：其中一个操作失败不影响其他操作成功执行
        if (bulkResponse.hasFailures()) {
            // process failures by iterating through each bulk response item
            BulkItemResponse[] items = bulkResponse.getItems();
            for (BulkItemResponse bulkItemResponse : items) {
                System.out.println(bulkItemResponse.getFailureMessage());
            }
        }else{
            System.out.println("bulk process success!");
        }
        client.close();
    }
    
    /**
     * 批量操作索引：Using Bulk Processor
     * 优化：先关闭副本，再添加副本，提升效率
     * @throws IOException
     * @throws ExecutionException
     * @throws InterruptedException
     */
    @Test
    public void test13() throws IOException, InterruptedException,
            ExecutionException {
        
        BulkProcessor bulkProcessor = BulkProcessor.builder(
                client,  
                new BulkProcessor.Listener() {
                    
                    public void beforeBulk(long executionId, BulkRequest request) {
                        // TODO Auto-generated method stub
                        System.out.println(request.numberOfActions());
                    }
                    
                    public void afterBulk(long executionId, BulkRequest request,
                            Throwable failure) {
                        // TODO Auto-generated method stub
                        System.out.println(failure.getMessage());
                    }
                    
                    public void afterBulk(long executionId, BulkRequest request,
                            BulkResponse response) {
                        // TODO Auto-generated method stub
                        System.out.println(response.hasFailures());
                    }
                })
                .setBulkActions(1000) // 每个批次的最大数量
                .setBulkSize(new ByteSizeValue(1, ByteSizeUnit.GB))// 每个批次的最大字节数
                .setFlushInterval(TimeValue.timeValueSeconds(5))// 每批提交时间间隔
                .setConcurrentRequests(1) //设置多少个并发处理线程
                //可以允许用户自定义当一个或者多个bulk请求失败后,该执行如何操作
                .setBackoffPolicy(
                    BackoffPolicy.exponentialBackoff(TimeValue.timeValueMillis(100), 3)) 
                .build();
        String json = "{" +
                ""user":"kimchy"," +
                ""postDate":"2013-01-30"," +
                ""message":"trying out Elasticsearch"" +
            "}";
        
        for (int i = 0; i < 1000; i++) {
            bulkProcessor.add(new IndexRequest("djt6", "user").source(json));
        }
        //阻塞至所有的请求线程处理完毕后，断开连接资源
        bulkProcessor.awaitClose(3, TimeUnit.MINUTES);
        client.close();
    }
    /**
     * SearchType使用方式
     * @throws Exception
     */
    @Test
    public void test14() throws Exception {
        SearchResponse response = client.prepareSearch("djt")  
                .setTypes("user")  
                .setSearchType(SearchType.DFS_QUERY_THEN_FETCH) 
               // .setSearchType(SearchType.QUERY_AND_FETCH)
                .execute()  
                .actionGet();  
        SearchHits hits = response.getHits();
        System.out.println(hits.getTotalHits());
    }
}

先创建索引库djt1

curl -XPUT 'master:9200/djt1/user/1' -d '{"name":"tom","age":18, "info":"tom"}'
curl -XPUT 'master:9200/djt1/user/2' -d '{"name":"jack","age":29, "info":"jack"}'
curl -XPUT 'master:9200/djt1/user/3' -d '{"name":"jetty","age":18, "info":"jetty"}'
curl -XPUT 'master:9200/djt1/user/4' -d '{"name":"daival","age":19, "info":"daival"}'
curl -XPUT 'master:9200/djt1/user/5' -d '{"name":"lilei","age":18, "info":"lilei"}'
curl -XPUT 'master:9200/djt1/user/6' -d '{"name":"lili","age":29, "info":"lili"}'
curl -XPUT 'master:9200/djt1/user/7' -d '{"name":"tom1","age":18, "info":"tom1"}'
curl -XPUT 'master:9200/djt1/user/8' -d '{"name":"tom2","age":19, "info":"tom2"}'
curl -XPUT 'master:9200/djt1/user/9' -d '{"name":"tom3","age":11, "info":"tom3"}'
curl -XPUT 'master:9200/djt1/user/10' -d '{"name":"tom4","age":18, "info":"tom4"}'
curl -XPUT 'master:9200/djt1/user/11' -d '{"name":"tom5","age":18, "info":"tom5"}'
curl -XPUT 'master:9200/djt1/user/12' -d '{"name":"tom6","age":18, "info":"tom6"}'
curl -XPUT 'master:9200/djt1/user/13' -d '{"name":"tom7","age":18, "info":"tom7"}'
curl -XPUT 'master:9200/djt1/user/14' -d '{"name":"tom8","age":18, "info":"tom8"}'
curl -XPUT 'master:9200/djt1/user/15' -d '{"name":"tom9","age":18, "info":"tom9"}'
curl -XPUT 'master:9200/djt1/user/16' -d '{"name":"john","age":18, "info":"john"}'
curl -XPUT 'master:9200/djt1/user/17' -d '{"name":"marry","age":38, "info":"marry"}'
curl -XPUT 'master:9200/djt1/user/18' -d '{"name":"jjk1","age":18, "info":"jjk1"}'

 

执行程序（这里是条件匹配查询）

 这里是把djt1库的所以数据都查出来

对多字段查询

模糊字符匹配查询方法

 根据权重来查询

 

完全匹配查询

从0开始只查询2条数据

对年龄进行升序查询2条数据

 查询某个年龄段的10条数据

参考代码 ESTestQuery.java

package com.dajiangtai.djt_spider.elasticsearch;

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.HashMap;
import java.util.Map;

import org.elasticsearch.action.search.SearchRequestBuilder;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.sort.SortOrder;
import org.junit.Before;
import org.junit.Test;

/**
 * Query 操作
 * 
 * @author 大讲台
 * 
 */
public class ESTestQuery {
    private TransportClient client;

    @Before
    public void test0() throws UnknownHostException {

        // 开启client.transport.sniff功能，探测集群所有节点
        Settings settings = Settings.settingsBuilder()
                .put("cluster.name", "escluster")
                .put("client.transport.sniff", true).build();
        // on startup
        // 获取TransportClient
        client = TransportClient
                .builder()
                .settings(settings)
                .build()
                .addTransportAddress(
                        new InetSocketTransportAddress(InetAddress
                                .getByName("master"), 9300))
                .addTransportAddress(
                        new InetSocketTransportAddress(InetAddress
                                .getByName("slave1"), 9300))
                .addTransportAddress(
                        new InetSocketTransportAddress(InetAddress
                                .getByName("slave2"), 9300));
    }
    /**
     * 查询：query
     * 分页：from to
     * 排序：sort
     * 过滤：filter
     * 
     * @throws Exception
     */
    @Test
    public void test1() throws Exception {
        SearchRequestBuilder builder = client.prepareSearch("djt1");
        builder//.setQuery(QueryBuilders.matchQuery("info", "marry and john"))
               .setQuery(QueryBuilders.matchAllQuery())
              // .setQuery(QueryBuilders.multiMatchQuery("john", "name","info"))
             //  .setQuery(QueryBuilders.queryStringQuery("name:tom*"))
             //.setQuery(QueryBuilders.boolQuery().should(QueryBuilders.matchQuery("name","tom").boost(3.0f)).should(QueryBuilders.matchQuery("age",18).boost(1.0f)))
                //.setQuery(QueryBuilders.termQuery("info", "tom"))
                .setFrom(0)
                .setSize(10)
                .addSort("age", SortOrder.ASC)
                .setPostFilter(QueryBuilders.rangeQuery("age").from(18).to(32))
                .setExplain(false)
                ;
        SearchResponse searchResponse = builder.get();
        SearchHits hits = searchResponse.getHits();
        Map<String, Object> map = new HashMap<String, Object>();
        SearchHit[] hits2 = hits.getHits();
        for (SearchHit searchHit : hits2) {
            System.out.println(searchHit.getSource().toString());
        }
    }
}
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原文地址：https://www.cnblogs.com/braveym/p/7026493.html