[Elasticsearch基础]-- Java链接elasticsearch的api

官方参考文档：https://www.elastic.co/guide/en/elasticsearch/client/java-api/current/index.html

 

编写java项目进行测试：

1\导入项目需要的elasticsearch----->jar包

 

 

2\编写测试类：TestJavaElasticsearch.java

首先在elasticsearch中创建索引

#创建索引

curl -XPOST http://hh15:9200/bjcom/employee/1 -d'

{

"first_name" : "John",

"last_name" : "Smith",

"age" : 25,

"about" : "I love to go rock climbing",

"interests": [ "sports", "music" ]

}'

 

编写java类

package com.test;

import java.net.InetAddress;

import java.net.UnknownHostException;

import org.elasticsearch.action.search.SearchResponse;

import org.elasticsearch.action.search.SearchType;

import org.elasticsearch.client.Client;

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;

public class Testes {

    public static void main(String[] args) throws UnknownHostException {

        Settings settings = Settings.settingsBuilder()

         //设置elasticesearch的集群名称

                .put("cluster.name", "hh15Elastic").build();

                Client client = TransportClient.builder().settings(settings).build()

          //端口号有时是9300,有时是9200，具体需要查看启动elasticsearch的log信息中的transport值

                .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("hh15"), 9300))

                .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("hh16"), 9300))

                .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("hh17"), 9300));

//索引是bjcom

                SearchResponse response = client.prepareSearch("bjcom")

//type是employee

                .setTypes("employee")

                .setSearchType(SearchType.DFS_QUERY_THEN_FETCH)

//注意字段需要全部为小写，因为不区分大小写

                .setQuery(QueryBuilders.termQuery("first_name","john"))             // Query

                .setPostFilter(QueryBuilders.rangeQuery("age").from(1).to(30))     // Filter，分页大小

                .setFrom(0).setSize(60).setExplain(true)

                .execute()

                .actionGet();

        SearchHits hits = response.getHits();

        SearchHit[] hits1 = hits.getHits();

        for(SearchHit hit : hits1){

           //返回的json字符串

            System.out.println("結果："+hit.getSourceAsString());

        }

    }

}

 

运行