ElasticSearch - 3 JavaAPI基本使用
ElasticSearch - 3 JavaAPI基本使用
6.1 SpringBoot整合ES（重点）
6.1.1 搭建SpringBoot工程
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.4.1</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.itheima</groupId>
<artifactId>springboot-es</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>springboot-es</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!--引入es的坐标-->
<dependency>
<groupId>org.elasticsearch.client</groupId>
<artifactId>elasticsearch-rest-high-level-client</artifactId>
<version>7.4.0</version>
</dependency>
<dependency>
<groupId>org.elasticsearch.client</groupId>
<artifactId>elasticsearch-rest-client</artifactId>
<version>7.4.0</version>
</dependency>
<dependency>
<groupId>org.elasticsearch</groupId>
<artifactId>elasticsearch</artifactId>
<version>7.4.0</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.4</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
ElasticSearchConfig.java
package com.itheima.springbootes.config;
import org.apache.http.HttpHost;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
* @author liqp
* @version 1.0
* @date 2020/12/21
*/
@Configuration
@ConfigurationProperties(prefix = "elasticsearch")
public class ElasticSearchConfig {
private String host;
private int port;
public String getHost() {
return host;
}
public void setHost(String host) {
this.host = host;
}
public int getPort() {
return port;
}
public void setPort(int port) {
this.port = port;
}
@Bean
public RestHighLevelClient client() {
return new RestHighLevelClient(RestClient.builder(
new HttpHost(host, port)
));
}
}
application.properties
elasticsearch.port=9200
elasticsearch.host=192.168.31.130
SpringbootEsApplicationTests.java
package com.itheima.springbootes;
import org.elasticsearch.client.RestHighLevelClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
@SpringBootTest
class SpringbootEsApplicationTests {
@Autowired
private RestHighLevelClient client;
}
6.2 创建索引、映射
添加索引
/**
* 添加索引
* @throws IOException
*/
@Test
public void addIndex() throws IOException {
//1.使用client获取操作索引对象
IndicesClient indices = client.indices();
//2.具体操作获取返回值
//2.1 设置索引名称
CreateIndexRequest createIndexRequest=new CreateIndexRequest("itheima");
CreateIndexResponse createIndexResponse = indices.create(createIndexRequest, RequestOptions.DEFAULT);
//3.根据返回值判断结果
System.out.println(createIndexResponse.isAcknowledged());
}
添加索引，并添加映射
/**
* 添加索引，并添加映射
*/
@Test
public void addIndexAndMapping() throws IOException {
//1.使用client获取操作索引对象
IndicesClient indices = client.indices();
//2.具体操作获取返回值
//2.具体操作，获取返回值
CreateIndexRequest createIndexRequest = new CreateIndexRequest("itcast");
//2.1 设置mappings
String mapping = "{\n" +
" \"properties\" : {\n" +
" \"address\" : {\n" +
" \"type\" : \"text\",\n" +
" \"analyzer\" : \"ik_max_word\"\n" +
" },\n" +
" \"age\" : {\n" +
" \"type\" : \"long\"\n" +
" },\n" +
" \"name\" : {\n" +
" \"type\" : \"keyword\"\n" +
" }\n" +
" }\n" +
" }";
createIndexRequest.mapping(mapping,XContentType.JSON);
CreateIndexResponse createIndexResponse = indices.create(createIndexRequest, RequestOptions.DEFAULT);
//3.根据返回值判断结果
System.out.println(createIndexResponse.isAcknowledged());
}
6.3 查询、删除、判断索引
查询索引
/**
* 查询索引
*/
@Test
public void queryIndex() throws IOException {
IndicesClient indices = client.indices();
GetIndexRequest getRequest=new GetIndexRequest("itcast");
GetIndexResponse response = indices.get(getRequest, RequestOptions.DEFAULT);
Map<String, MappingMetaData> mappings = response.getMappings();
//iter 提示foreach
for (String key : mappings.keySet()) {
System.out.println(key+"==="+mappings.get(key).getSourceAsMap());
}
}
删除索引
/**
* 删除索引
*/
@Test
public void deleteIndex() throws IOException {
IndicesClient indices = client.indices();
DeleteIndexRequest deleteRequest=new DeleteIndexRequest("itheima");
AcknowledgedResponse delete = indices.delete(deleteRequest, RequestOptions.DEFAULT);
System.out.println(delete.isAcknowledged());
}
索引是否存在
/**
* 索引是否存在
*/
@Test
public void existIndex() throws IOException {
IndicesClient indices = client.indices();
GetIndexRequest getIndexRequest=new GetIndexRequest("itheima");
boolean exists = indices.exists(getIndexRequest, RequestOptions.DEFAULT);
System.out.println(exists);
}
6.4 添加文档（重点）
添加文档,使用map作为数据
@Test
public void addDoc1() throws IOException {
Map<String, Object> map=new HashMap<>();
map.put("name","张三");
map.put("age","18");
map.put("address","北京二环");
IndexRequest request=new IndexRequest("itcast").id("1").source(map);
IndexResponse response = client.index(request, RequestOptions.DEFAULT);
System.out.println(response.getId());
}
添加文档,使用json字符串作为数据
@Test
public void addDoc2() throws IOException {
Person person=new Person();
person.setId("2");
person.setName("李四");
person.setAge(20);
person.setAddress("北京三环");
String data = JSON.toJSONString(person);
IndexRequest request=new IndexRequest("itcast").id(person.getId()).source(data,XContentType.JSON);
IndexResponse response = client.index(request, RequestOptions.DEFAULT);
System.out.println(response.getId());
}
6.5 修改、查询、删除文档（重点）
修改文档：添加文档时，如果id存在则修改，id不存在则添加
/**
* 修改文档：添加文档时，如果id存在则修改，id不存在则添加
*/
@Test
public void UpdateDoc() throws IOException {
Person person=new Person();
person.setId("2");
person.setName("李四");
person.setAge(20);
person.setAddress("北京三环车王");
String data = JSON.toJSONString(person);
IndexRequest request=new IndexRequest("itcast").id(person.getId()).source(data,XContentType.JSON);
IndexResponse response = client.index(request, RequestOptions.DEFAULT);
System.out.println(response.getId());
}
根据id查询文档
/**
* 根据id查询文档
*/
@Test
public void getDoc() throws IOException {
//设置查询的索引、文档
GetRequest getRequest=new GetRequest("itcast","2");
GetResponse response = client.get(getRequest, RequestOptions.DEFAULT);
System.out.println(response.getSourceAsString());
}
根据id删除文档
/**
* 根据id删除文档
*/
@Test
public void delDoc() throws IOException {
//设置要删除的索引、文档
DeleteRequest deleteRequest=new DeleteRequest("itcast","1");
DeleteResponse response = client.delete(deleteRequest, RequestOptions.DEFAULT);
System.out.println(response.getId());
}
