使用Java调用ElasticSearch提供的相关API进行数据搜索完整实例演示

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使用Java调用ElasticSearch提供的相关API进行数据搜索完整实例演示

安装包下载

当前最新版本为 :0.20.6 
http://www.elasticsearch.org/download/  

官方视频教程 
http://www.elasticsearch.org/videos/

 

Window 环境

下载完解开有以下个包 
bin 是运行的脚本, config 是设置文件, lib 是放依赖的包。 

启动解压目录下的 bin 名称的文件夹,双击 elasticsearch.bat 文件,就可以启动 elasticsearch ,启动成功界面如下 :

启动成功后 , 会在解压目录下增加 2 个文件件 ,data 用于数据存储 , logs 用于日志记录 , 可以自己创建 plugins 目录中用于放置自己的插件。

此时可以在浏览器中输入  http://localhost:9200/

"ok" : true, "status" : 200, "name" : "Glob Herman", "version" : { "number" : "0.20.6", "snapshot_build" : false }, "tagline" : "You Know, for Search" }

出现上面结果 , 表示成功启动!

 

集成分词器的 ElasticSearch 下载地址 :

https://github.com/medcl/elasticsearch-rtf

 

Java 模拟简单搜索

实体类

package org.dennisit.entity;/** *  * *  @version : 1.0 *   *  @author  : 苏若年              <a href="mailto:DennisIT@163.com">发送邮件</a> *     *  @since   : 1.0        创建时间:    2013-4-8    下午04:51:03 *      *  @function: TODO         * */public class Medicine {    private Integer id;    private String name;    private String function;        public Medicine() {        super();    }    public Medicine(Integer id, String name, String function) {        super();        this.id = id;        this.name = name;        this.function = function;    }        //getter and  setter ()}

模拟数据

package org.dennisit.entity;import java.util.ArrayList;import java.util.List;import org.dennisit.util.JsonUtil;/** *  * *  @version : 1.0 *   *  @author  : 苏若年              <a href="mailto:DennisIT@163.com">发送邮件</a> *     *  @since   : 1.0        创建时间:    2013-4-8    上午11:38:15 *      *  @function: TODO         * */public class DataFactory {        public static DataFactory dataFactory = new DataFactory();        private DataFactory(){            }        public DataFactory getInstance(){        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;    }}

应用工具类

package org.dennisit.util;import java.io.IOException;import org.dennisit.entity.Medicine;import org.elasticsearch.common.xcontent.XContentBuilder;import org.elasticsearch.common.xcontent.XContentFactory;/** *  * *  @version : 1.0 *   *  @author  : 苏若年              <a href="mailto:DennisIT@163.com">发送邮件</a> *     *  @since   : 1.0        创建时间:    2013-4-8    上午11:34:56 *      *  @function: TODO         * */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;    }}

ElasticSearch 核心搜索模拟类

package org.dennisit.elastic.process;import java.util.ArrayList;import java.util.List;import org.dennisit.entity.DataFactory;import org.dennisit.entity.Medicine;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.index.query.QueryBuilders;import org.elasticsearch.search.SearchHit;import org.elasticsearch.search.SearchHits;/** *  * *  @version : 1.0 *   *  @author  : 苏若年              <a href="mailto:DennisIT@163.com">发送邮件</a> *     *  @since   : 1.0        创建时间:    2013-4-8    上午11:34:04 *      *  @function: TODO         * */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.hits();        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;    }            public static void main(String[] args) {        ElasticSearchHandler esHandler = new ElasticSearchHandler();        List<String> jsondata = DataFactory.getInitJsonData();        String indexname = "indexdemo";        String type = "typedemo";        esHandler.createIndexResponse(indexname, type, jsondata);        //查询条件        QueryBuilder queryBuilder = QueryBuilders.fieldQuery("name", "感冒");        /*QueryBuilder queryBuilder = QueryBuilders.boolQuery()          .must(QueryBuilders.termQuery("id", 1));*/        List<Medicine> result = esHandler.searcher(queryBuilder, indexname, type);        for(int i=0; i<result.size(); i++){            Medicine medicine = result.get(i);            System.out.println("(" + medicine.getId() + ")药品名称:" +medicine.getName() + "\t\t" + medicine.getFunction());        }    }}
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