elasticsearch 简介和创建索引初步

简介：ElasticSearch是一个开源的分布式搜索引擎，具备高可靠性，支持非常多的企业级搜索用例。像Solr4一样，是基于Lucene构建的。支持时间时间索引和全文检索。官网：http://www.elasticsearch.org

它对外提供一系列基于java和http的api，用于索引、检索、修改大多数配置。下载地址 http://www.elasticsearch.org/download

elasticsearch 索引创建：

本项目环境：eclipse + JDK 7 + elasticsearch1.7.0

项目截图：

 

源代码：

package com.elasticsearch.entity;/** * 实体数据类 * @author Administrator * */public class Medicine { private Integer id;    private String name;    private String function;    public Medicine() {super();// TODO Auto-generated constructor stub}public Medicine(Integer id, String name, String function) {super();this.id = id;this.name = name;this.function = function;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getFunction() {return function;}public void setFunction(String function) {this.function = function;}        }

package com.elasticsearch.date;import java.util.ArrayList;import java.util.List;import com.elasticsearch.entity.Medicine;import com.elasticsearch.util.JsonUtil;/** * 实体数据集合工厂 * @author Administrator * */public class DataFactory {public static DataFactory dataFactory = null;        private DataFactory(){            }        public DataFactory getInstance(){    if(dataFactory == null){    dataFactory = new DataFactory();    }        return dataFactory;    }    public static List<String> getInitJsonData(){        List<String> list = new ArrayList<String>();        String data1  = JsonUtil.obj2JsonData(new Medicine(1,"银花 感冒 颗粒","功能主治：银花感冒颗粒 ，头痛,清热，解表，利咽。"));        String data2  = JsonUtil.obj2JsonData(new Medicine(2,"感冒  止咳糖浆","功能主治：感冒止咳糖浆,解表清热，止咳化痰。"));        String data3  = JsonUtil.obj2JsonData(new Medicine(3,"感冒灵颗粒","功能主治：解热镇痛。头痛 ,清热。"));        String data4  = JsonUtil.obj2JsonData(new Medicine(4,"感冒  灵胶囊","功能主治：银花感冒颗粒 ，头痛,清热，解表，利咽。"));        String data5  = JsonUtil.obj2JsonData(new Medicine(5,"仁和 感冒 颗粒","功能主治：疏风清热，宣肺止咳,解表清热，止咳化痰。"));        list.add(data1);        list.add(data2);        list.add(data3);        list.add(data4);        list.add(data5);        return list;    }}

package com.elasticsearch.util;import java.io.IOException;import org.elasticsearch.common.xcontent.XContentBuilder;import org.elasticsearch.common.xcontent.XContentFactory;import com.elasticsearch.entity.Medicine;public class JsonUtil { /**     * 实现将实体对象转换成json对象     * @param medicine    Medicine对象     * @return     */    public static String obj2JsonData(Medicine medicine){        String jsonData = null;        try {            //使用XContentBuilder创建json数据            XContentBuilder jsonBuild = XContentFactory.jsonBuilder();            jsonBuild.startObject()            .field("id",medicine.getId())            .field("name", medicine.getName())            .field("funciton",medicine.getFunction())            .endObject();            jsonData = jsonBuild.string();            System.out.println(jsonData);        } catch (IOException e) {            e.printStackTrace();        }        return jsonData;    }}

package com.elasticsearch.index;import java.util.ArrayList;import java.util.List;import org.elasticsearch.action.index.IndexRequestBuilder;import org.elasticsearch.action.index.IndexResponse;import org.elasticsearch.action.search.SearchResponse;import org.elasticsearch.client.Client;import org.elasticsearch.client.transport.TransportClient;import org.elasticsearch.common.transport.InetSocketTransportAddress;import org.elasticsearch.index.query.QueryBuilder;import org.elasticsearch.search.SearchHit;import org.elasticsearch.search.SearchHits;import com.elasticsearch.entity.Medicine;/** * ElasticSearch 搜索引擎封装 * @author Administrator * */public class ElasticSearchHandler {private Client client;    public ElasticSearchHandler(){            //使用本机做为节点        this("127.0.0.1");    }        public ElasticSearchHandler(String ipAddress){        //集群连接超时设置        /*                Settings settings = ImmutableSettings.settingsBuilder().put("client.transport.ping_timeout", "10s").build();            client = new TransportClient(settings);         */        client = new TransportClient().addTransportAddress(new InetSocketTransportAddress(ipAddress, 9300));    }        /**     * 建立索引,索引建立好之后,会在elasticsearch-0.20.6\data\elasticsearch\nodes\0创建所以你看     * @param indexName  为索引库名，一个es集群中可以有多个索引库。 名称必须为小写     * @param indexType  Type为索引类型，是用来区分同索引库下不同类型的数据的，一个索引库下可以有多个索引类型。     * @param jsondata     json格式的数据集合     *      * @return     */    public void createIndexResponse(String indexname, String type, List<String> jsondata){        //创建索引库 需要注意的是.setRefresh(true)这里一定要设置,否则第一次建立索引查找不到数据        IndexRequestBuilder requestBuilder = client.prepareIndex(indexname, type).setRefresh(true);        for(int i=0; i<jsondata.size(); i++){            requestBuilder.setSource(jsondata.get(i)).execute().actionGet();        }                  }        /**     * 创建索引     * @param client     * @param jsondata     * @return     */    public IndexResponse createIndexResponse(String indexname, String type,String jsondata){        IndexResponse response = client.prepareIndex(indexname, type)            .setSource(jsondata)            .execute()            .actionGet();        return response;    }        /**     * 执行搜索     * @param queryBuilder     * @param indexname     * @param type     * @return     */    public List<Medicine>  searcher(QueryBuilder queryBuilder, String indexname, String type){        List<Medicine> list = new ArrayList<Medicine>();        SearchResponse searchResponse = client.prepareSearch(indexname).setTypes(type)        .setQuery(queryBuilder)        .execute()        .actionGet();        SearchHits hits = searchResponse.getHits();        System.out.println("查询到记录数=" + hits.getTotalHits());        SearchHit[] searchHists = hits.getHits();        if(searchHists.length>0){            for(SearchHit hit:searchHists){                Integer id = (Integer)hit.getSource().get("id");                String name =  (String) hit.getSource().get("name");                String function =  (String) hit.getSource().get("funciton");                list.add(new Medicine(id, name, function));            }        }        return list;    }                }

创建ElasticSearch 索引代码：

package com.elasticsearch.main;import java.util.List;import org.elasticsearch.index.query.QueryBuilder;import org.elasticsearch.index.query.QueryBuilders;import com.elasticsearch.date.DataFactory;import com.elasticsearch.entity.Medicine;import com.elasticsearch.index.ElasticSearchHandler;public class ElasticsearchTest {public static void main(String[] args) {// TODO Auto-generated method stub ElasticSearchHandler esHandler = new ElasticSearchHandler();     List<String> jsondata = DataFactory.getInitJsonData();     // String indexname = "indexdemo";     String indexname = "eindexdemo";     // String type = "typedemo";     String type = "etypedemo";     //创建索引     esHandler.createIndexResponse(indexname, type, jsondata);}}

访问：http://localhost:9200/_plugin/head/，检查相关ElasticSearch 的相关索引是否创建成功？