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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

2016-04-22 00:54 1061 查看


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

时间 2013-04-08 18:32:00  博客园精华区
原文  http://www.cnblogs.com/dennisit/archive/2013/04/08/3008631.html
主题 Elastic
Search Java

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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