1 导入需要的pom
org.elasticsearch
elasticsearch
7.3.0
org.elasticsearch.client
transport
7.3.0
org.apache.logging.log4j
log4j-core
2.11.1
com.fasterxml.jackson.core
jackson-databind
2.9.9.3
com.fasterxml.jackson.core
jackson-annotations
2.9.9
2 编写方法
package com.shi.es;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.transport.client.PreBuiltTransportClient;
import com.fasterxml.jackson.databind.ObjectMapper;
/**
* ES客户端类
*
* @author shiye
*
*/
public class ElasticSearchClient {
/**
* 创建索引
* @throws Exception
*/
public void createIndex() throws Exception {
// 1 创建一个Settings对象，相当于一个配置信息，主要配置集群中的名称
Settings settings = Settings.builder().put("cluster.name", "my-elasticsearch").build();
// 2 创建一个客户端client对象 （单机版的暂时没问题，集群的有问题）
TransportClient client = new PreBuiltTransportClient(Settings.EMPTY);
client.addTransportAddress(new TransportAddress(InetAddress.getByName("127.0.0.1"), 9300));
// 3 使用client创建一个索引库
client.admin().indices().prepareCreate("index_client").get();// 执行操作
System.out.println("index_client 索引设置成功...");
// 4 关闭client对象
client.close();
}
/**
* 设置mapping信息
* @throws IOException
*/
public void setMappings() throws IOException {
// 1 创建一个Settings对象，相当于一个配置信息，主要配置集群中的名称
Settings settings = Settings.builder().put("cluster.name", "my-elasticsearch").build();
// 2 创建一个客户端client对象 （单机版的暂时没问题，集群的有问题）
TransportClient client = new PreBuiltTransportClient(Settings.EMPTY);
client.addTransportAddress(new TransportAddress(InetAddress.getByName("127.0.0.1"), 9300));
// {
// "properties": {
// "content": {
// "type": "text",
// "analyzer": "ik_max_word",
// "search_analyzer": "ik_max_word"
// }
// }
// }
XContentBuilder builder = XContentFactory.jsonBuilder()
.startObject()
.startObject("properties")
.startObject("content")
.field("type", "text")
.field("analyzer","ik_max_word")
.field("search_analyzer","ik_max_word")
.endObject()
.endObject()
.endObject();
System.out.println(builder.toString());
//使用client把mapping信息设置到索引库中
client.admin().indices()
.preparePutMapping("index_client") //设置要做映射的索引
.setType("content")//设置要做映射的type
.setSource(builder)//mapping信息
.get();//执行操作
System.out.println("mapping设置成功...");
//管理客户端
client.close();
}
/**
* 添加文档 方式一
* @throws IOException
*/
public void setAddDOC1() throws IOException {
// 1 创建一个Settings对象，相当于一个配置信息，主要配置集群中的名称
Settings settings = Settings.builder().put("cluster.name", "my-elasticsearch").build();
// 2 创建一个客户端client对象 （单机版的暂时没问题，集群的有问题）
TransportClient client = new PreBuiltTransportClient(Settings.EMPTY);
client.addTransportAddress(new TransportAddress(InetAddress.getByName("127.0.0.1"), 9300));
XContentBuilder builder = XContentFactory.jsonBuilder()
.startObject()
.field("content","美国留给伊拉克的是个烂摊子吗")
.endObject();
System.out.println(builder.isPrettyPrint());
//把文档对象添加到索引库
client.prepareIndex()
.setIndex("index_client") //设置索引名称
.setType("content") //设置type
.setId("1") //设置文档的id，如果不设置的话自动生成一个id
.setSource(builder) //设置文档信息
.get(); //执行操作
System.out.println("文档添加成功...");
//关闭客户端
client.close();
}
/**
* 添加文档 方式二
* @throws IOException
*/
public void setAddDOC2() throws IOException {
// 1 创建一个Settings对象，相当于一个配置信息，主要配置集群中的名称
Settings settings = Settings.builder().put("cluster.name", "my-elasticsearch").build();
// 2 创建一个客户端client对象 （单机版的暂时没问题，集群的有问题）
TransportClient client = new PreBuiltTransportClient(Settings.EMPTY);
client.addTransportAddress(new TransportAddress(InetAddress.getByName("127.0.0.1"), 9300));
//创建对象
Content content = new Content();
content.setContent("公安部：各地校车将享最高路权");
ObjectMapper objectMapper = new ObjectMapper();
String jsonDocument = objectMapper.writeValueAsString(content);
System.out.println(jsonDocument);
//使用client对象把文档写入索引库
client.prepareIndex("index_client", "content")
.setSource(jsonDocument,XContentType.JSON)
.get();
System.out.println("文档添加成功...");
//关闭客户端
client.close();
}
}
package com.shi.es;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Iterator;
import java.util.Map;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.common.transport.TransportAddress;
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.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.transport.client.PreBuiltTransportClient;
public class ESQueryClient {
/**
* 简单的执行查询对象
* @param client
* @param builder
*/
private void search(TransportClient client , QueryBuilder builder) {
//4 执行查询
SearchResponse searchResponse = client.prepareSearch("index_client")
.setTypes("content")
.setQuery(builder)
.setFrom(0) //起始行数
.setSize(5) //每一页显示的数量
.get();
//5 取查询结果
SearchHits searchHits = searchResponse.getHits();
System.out.println("查询到的总的结果数 = " + searchHits.getTotalHits());
Iterator iterator = searchHits.iterator();
while(iterator.hasNext()) {
SearchHit hit = iterator.next();
System.out.println(hit.getSourceAsString());
System.out.println("------获取文档属性------");
Map map = hit.getSourceAsMap();
System.out.println(map.get("content"));
}
}
/**
* 设置高亮显示的查询
* @param client
* @param builder
* @param hightFiled
*/
private void search(TransportClient client , QueryBuilder builder, String hightFiled) {
HighlightBuilder highlightBuilder = new HighlightBuilder();
highlightBuilder.field(hightFiled); //设置需要高亮显示的域
highlightBuilder.preTags(""); //设置前缀
highlightBuilder.postTags("");//设置后缀
//4 执行查询
SearchResponse searchResponse = client.prepareSearch("index_client")
.setTypes("content")
.setQuery(builder)
.setFrom(0) //起始行数
.setSize(5) //每一页显示的数量
.highlighter(highlightBuilder)//设置高亮显示
.get();
//5 取查询结果
SearchHits searchHits = searchResponse.getHits();
System.out.println("查询到的总的结果数 = " + searchHits.getTotalHits());
Iterator iterator = searchHits.iterator();
while(iterator.hasNext()) {
SearchHit hit = iterator.next();
System.out.println(hit.getSourceAsString());
System.out.println("------获取文档属性------");
Map map = hit.getSourceAsMap();
System.out.println(map.get("content"));
System.out.println("------获取高亮显示的数据------");
Map highlightFields = hit.getHighlightFields();
HighlightField field = highlightFields.get(hightFiled);
Text[] fragments = field.getFragments();
if(fragments != null) {
System.out.println(fragments[0]);
}
}
}
/**
* 通过id来查询
* @throws UnknownHostException
*/
public void queryById() throws UnknownHostException {
// 1 创建一个Settings对象，相当于一个配置信息，主要配置集群中的名称
Settings settings = Settings.builder().put("cluster.name", "my-elasticsearch").build();
// 2 创建一个客户端client对象 （单机版的暂时没问题，集群的有问题）
TransportClient client = new PreBuiltTransportClient(Settings.EMPTY);
client.addTransportAddress(new TransportAddress(InetAddress.getByName("127.0.0.1"), 9300));
//3 创建一个查询对象
QueryBuilder builder = QueryBuilders.idsQuery().addIds("1","2","3");
search(client,builder);//执行查询
}
/**
* 通过Term来查询
* @throws UnknownHostException
*/
public void queryByTerm() throws UnknownHostException {
// 1 创建一个Settings对象，相当于一个配置信息，主要配置集群中的名称
Settings settings = Settings.builder().put("cluster.name", "my-elasticsearch").build();
// 2 创建一个客户端client对象 （单机版的暂时没问题，集群的有问题）
TransportClient client = new PreBuiltTransportClient(Settings.EMPTY);
client.addTransportAddress(new TransportAddress(InetAddress.getByName("127.0.0.1"), 9300));
//3 创建一个查询对象
QueryBuilder builder = QueryBuilders.spanTermQuery("content", "伊拉克");
// search(client,builder);//执行查询
search(client,builder,"content");//执行高亮查询
}
/**
* 通过StringQuery来查询
* 先对需要查询的字符串进行分词，在查询
* @throws UnknownHostException
*/
public void queryByQueryString() throws UnknownHostException {
// 1 创建一个Settings对象，相当于一个配置信息，主要配置集群中的名称
Settings settings = Settings.builder().put("cluster.name", "my-elasticsearch").build();
// 2 创建一个客户端client对象 （单机版的暂时没问题，集群的有问题）
TransportClient client = new PreBuiltTransportClient(Settings.EMPTY);
client.addTransportAddress(new TransportAddress(InetAddress.getByName("127.0.0.1"), 9300));
//3 创建一个查询对象
QueryBuilder builder = QueryBuilders.queryStringQuery("无人驾驶校车").defaultField("content");
search(client,builder);//执行查询
}
}
3 测试
package com.shi.es;
public class ClientTest {
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
//创建
// ElasticSearchClient esClient = new ElasticSearchClient();
// esClient.createIndex(); //创建索引库
// esClient.setMappings();//设置mapping信息
// esClient.setAddDOC1();//添加文档 方式1
// esClient.setAddDOC2();//添加文档 方式2
//查询
ESQueryClient client = new ESQueryClient();
// client.queryById();
client.queryByTerm();
// client.queryByQueryString();
}
}