Windows下使用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elasticsearch-rtf下载
elasticsearch中文发行版，针对中文集成了相关插件（包含ik analyzer），并带有Demo，方便新手学习,或者在生产环境中直接使用
redis下载
http://pan.baidu.com/s/1kTD2XG7
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/
{
"status": 200,
"name": "Carlos Lobo",
"cluster_name": "elasticsearch",
"version": {
"number": "1.7.2",
"build_hash": "e43676b1385b8125d647f593f7202acbd816e8ec",
"build_timestamp": "2015-09-14T09:49:53Z",
"build_snapshot": false,
"lucene_version": "4.10.4"
},
"tagline": "You Know, for Search"
}
出现上面结果 , 表示成功启动！
Java 模拟简单搜索
POM文件(我这用的maven工程)
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<es.version>1.5.2</es.version>
</properties>
<dependencies>
<dependency>
<groupId>org.elasticsearch</groupId>
<artifactId>elasticsearch</artifactId>
<version>${es.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.6.2</version>
</dependency>
</dependencies>
实体类
package org.dennisit.entity;
public class Medicine {
private Integer id;// id
private String name;// 名称
private String function;// 功能
private double price;// 价格
public Medicine() {
super();
}
public Medicine(Integer id, String name, double price, String function) {
super();
this.id = id;
this.name = name;
this.price = price;
this.function = function;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
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;
}
}
模拟数据
package org.dennisit.entity;
import java.util.ArrayList;
import java.util.List;
import org.dennisit.util.JsonUtil;
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, "感冒 胶囊", 25.1, "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", 31.2, "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", 28.2, "功能主治：解热镇痛。头痛 ,清热。"));
String data4 = JsonUtil.obj2JsonData(new Medicine(4, "感冒 灵胶囊", 19.8, "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", 32.1, "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;
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 java.util.Map;
import org.dennisit.entity.DataFactory;
import org.dennisit.entity.Medicine;
import org.elasticsearch.action.bulk.BulkRequestBuilder;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.delete.DeleteResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.action.search.SearchRequestBuilder;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.Client;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.index.query.FilterBuilders;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.highlight.HighlightField;
import org.elasticsearch.search.sort.SortBuilders;
import org.elasticsearch.search.sort.SortOrder;
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) {
client = new TransportClient().addTransportAddress(new InetSocketTransportAddress(ipAddress, 9300));
}
/**
* 建立索引,索引建立好之后,会在elasticsearch-rtf-master\data\elasticsearch\nodes\0创建所以你看
*
* @param index
* 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 type
* 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 index, String type, List<String> jsondata) {
// 创建索引库
List<IndexRequest> requests = new ArrayList<IndexRequest>();
for (int i = 0; i < jsondata.size(); i++) {
IndexRequest request = client.prepareIndex(index, type).setSource(jsondata.get(i)).request();
requests.add(request);
}
// 批量创建索引
BulkRequestBuilder bulkRequest = client.prepareBulk();
for (IndexRequest request : requests) {
bulkRequest.add(request);
}
BulkResponse bulkResponse = bulkRequest.execute().actionGet();
if (bulkResponse.hasFailures()) {
System.out.println("批量创建索引错误！");
}
}
/**
* 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(SearchRequestBuilder searchRequestBuilder, String indexname, String type) {
List<Medicine> list = new ArrayList<Medicine>();
SearchResponse searchResponse = searchRequestBuilder.setTypes(type).execute().actionGet();
SearchHits hits = searchResponse.getHits();
System.out.println("查询到记录数=" + hits.getTotalHits());
SearchHit[] searchHists = hits.getHits();
for (SearchHit hit : searchHists) {
Integer id = (Integer) hit.getSource().get("id");
String name = (String) hit.getSource().get("name");
// 获取对应的高亮域
Map<String, HighlightField> result = hit.highlightFields();
// 从设定的高亮域中取得指定域
HighlightField titleField = result.get("name");
// 取得定义的高亮标签
Text[] titleTexts = titleField.fragments();
// 为title串值增加自定义的高亮标签
String title = "";
for (Text text : titleTexts) {
title += text;
}
// 将追加了高亮标签的串值重新填充到对应的对象
name = title;
double price = (double) hit.getSource().get("price");
String function = (String) hit.getSource().get("funciton");
list.add(new Medicine(id, name, price, function));
}
return list;
}
// 根据索引名删除索引
public boolean deleteIndex(String indexName) {
try {
QueryBuilder queryBuilder = QueryBuilders.matchAllQuery();
client.prepareDeleteByQuery(indexName).setQuery(queryBuilder).execute().actionGet();
return true;
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
// 根据数据id删除数据
public boolean deleteData(String indexName, String typeName, String dataId) {
try {
// 设置线程:当删除api在同一个节点上执行时（在一个分片中执行一个api会分配到同一个服务器上），删除api允许执行前设置线程模式（operationThreaded选项），operationThreaded这个选项是使这个操作在另外一个线程中执行，或在一个正在请求的线程（假设这个api仍是异步的）中执行。默认的话operationThreaded会设置成true，这意味着这个操作将在一个不同的线程中执行。下面是设置成false的方法：
DeleteResponse response = client.prepareDelete(indexName, typeName, dataId).setOperationThreaded(false).execute().actionGet();
return true;
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
// 根据数据查询条件删除
public boolean deleteData(String indexName, String typeName, QueryBuilder query) {
try {
client.prepareDeleteByQuery(indexName).setTypes(typeName).setQuery(query).execute().actionGet();
return true;
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
public static void main(String[] args) {
ElasticSearchHandler esHandler = new ElasticSearchHandler();
List<String> jsondata = DataFactory.getInitJsonData();
String indexName = "user";
String typeName = "medicine";
// 创建索引，追加方式
// esHandler.createIndexResponse(indexname, type, jsondata);
// 删除索引
// esHandler.deleteIndex(indexname);
// 查询条件
SearchRequestBuilder searchRequestBuilder = esHandler.client.prepareSearch(indexName);
// 设置查询关键词
searchRequestBuilder.setQuery(QueryBuilders.wildcardQuery("name", "*感冒*"));
// 设置高亮显示
searchRequestBuilder.addHighlightedField("name");
searchRequestBuilder.setHighlighterPreTags("<span style=\"color:red\">");
searchRequestBuilder.setHighlighterPostTags("</span>");
// 列条件过滤， 价格范围查询
searchRequestBuilder.setPostFilter(FilterBuilders.rangeFilter("price").from(10).to(32));
// 查询条数
searchRequestBuilder.setFrom(0).setSize(6);
// 排序
searchRequestBuilder.addSort(SortBuilders.fieldSort("price").order(SortOrder.ASC));
// 设置是否按查询匹配度排序
searchRequestBuilder.setExplain(true);
List<Medicine> result = esHandler.searcher(searchRequestBuilder, indexName, typeName);
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" + medicine.getPrice() + "\t" + medicine.getFunction());
}
}
}
启动 ElasticSearch(window 下 bin/elasticsearch.bat) 和redis
程序运行前, 默认的 nodes 目录下没有内容 , 运行程序后会建立如下目录 
控制台输出信息
{"id":1,"name":"银花 感冒 颗粒","funciton":"功能主治：银花感冒颗粒 ，头痛,清热，解表，利咽。"}
{"id":2,"name":"感冒 止咳糖浆","funciton":"功能主治：感冒止咳糖浆,解表清热，止咳化痰。"}
{"id":3,"name":"感冒灵颗粒","funciton":"功能主治：解热镇痛。头痛 ,清热。"}
{"id":4,"name":"感冒 灵胶囊","funciton":"功能主治：银花感冒颗粒 ，头痛,清热，解表，利咽。"}
{"id":5,"name":"仁和 感冒 颗粒","funciton":"功能主治：疏风清热，宣肺止咳,解表清热，止咳化痰。"}
查询到记录数=5(4)药品名称:感冒 灵胶囊 功能主治：银花感冒颗粒 ，头痛,清热，解表，利咽。
(1)药品名称:银花 感冒 颗粒 功能主治：银花感冒颗粒 ，头痛,清热，解表，利咽。
(2)药品名称:感冒 止咳糖浆 功能主治：感冒止咳糖浆,解表清热，止咳化痰。
(3)药品名称:感冒灵颗粒 功能主治：解热镇痛。头痛 ,清热。
(5)药品名称: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。