一、ES客户端
ES提供多种不同的客户端：
1、TransportClient
ES提供的传统客户端，官方计划8.0版本删除此客户端。
2、RestClient
RestClient是官方推荐使用的，它包括两种：REST Low Level Client和 REST High Level Client。ES在6.0之后提供REST High Level Client， 两种客户端官方更推荐使用 REST High Level Client，不过当前它还处于完善中，有些功能还没有。
二、搭建工程
2.1.pom.xml
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.2.RELEASE</version>
</parent>
<!-- 修改elasticsearch的版本 -->
<properties>
<elasticsearch.version>6.2.3</elasticsearch.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.elasticsearch.client</groupId>
<artifactId>elasticsearch-rest-high-level-client</artifactId>
<version>${elasticsearch.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
</dependency>
</dependencies>
2.2.application.yml
spring:
elasticsearch:
rest:
uris:
- http://192.168.113.135:9200
2.3.app
@SpringBootApplication
public class ElasticsearchApp {
public static void main(String[] args) {
SpringApplication.run(ElasticsearchApp.class, args);
}
}
三、索引管理
3.1 api
创建索引库：
PUT /java06 { "settings":{
"number_of_shards" : 2,
"number_of_replicas" : 0 } }
创建映射：
POST /java06/course/_mapping
{
"_source": {
"excludes":["description"]
},
"properties": {
"name": {
"type": "text",
"analyzer":"ik_max_word",
"search_analyzer":"ik_smart"
},
"description": {
"type": "text",
"analyzer":"ik_max_word",
"search_analyzer":"ik_smart"
},
"studymodel": {
"type": "keyword"
},
"price": {
"type": "float"
},
"pic":{
"type":"text",
"index":false
}
}
}
3.1.2.Java Client
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = {ElasticsearchApp.class})
public class IndexWriterTest {
@Autowired
private RestHighLevelClient restHighLevelClient;
//创建索引库
@Test
public void testCreateIndex() throws IOException {
//创建“创建索引请求”对象，并设置索引名称
CreateIndexRequest createIndexRequest = new CreateIndexRequest("java06");
//设置索引参数
createIndexRequest.settings("{\n" +
" \"number_of_shards\" : 2,\n" +
" \"number_of_replicas\" : 0\n" +
" }", XContentType.JSON);
createIndexRequest.mapping("course", "{\r\n" +
" \"_source\": {\r\n" +
" \"excludes\":[\"description\"]\r\n" +
" }, \r\n" +
" \"properties\": {\r\n" +
" \"name\": {\r\n" +
" \"type\": \"text\",\r\n" +
" \"analyzer\":\"ik_max_word\",\r\n" +
" \"search_analyzer\":\"ik_smart\"\r\n" +
" },\r\n" +
" \"description\": {\r\n" +
" \"type\": \"text\",\r\n" +
" \"analyzer\":\"ik_max_word\",\r\n" +
" \"search_analyzer\":\"ik_smart\"\r\n" +
" },\r\n" +
" \"studymodel\": {\r\n" +
" \"type\": \"keyword\"\r\n" +
" },\r\n" +
" \"price\": {\r\n" +
" \"type\": \"float\"\r\n" +
" },\r\n" +
" }\r\n" +
"}", XContentType.JSON);
//创建索引操作客户端
IndicesClient indices = restHighLevelClient.indices();
//创建响应对象
CreateIndexResponse createIndexResponse =
indices.create(createIndexRequest);
//得到响应结果
boolean acknowledged = createIndexResponse.isAcknowledged();
System.out.println(acknowledged);
}
}
3.2.删除索引库
3.2.1.api
DELETE /java06
3.2.2.java client
//删除索引库
@Test
public void testDeleteIndex() throws IOException {
//创建“删除索引请求”对象
DeleteIndexRequest deleteIndexRequest = new DeleteIndexRequest("java06");
//创建索引操作客户端
IndicesClient indices = restHighLevelClient.indices();
//创建响应对象
DeleteIndexResponse deleteIndexResponse =
indices.delete(deleteIndexRequest);
//得到响应结果
boolean acknowledged = deleteIndexResponse.isAcknowledged();
System.out.println(acknowledged);
}
3.3.添加文档
3.3.1.api
POST /java06/course/1
{
"name":"spring cloud实战",
"description":"本课程主要从四个章节进行讲解： 1.微服务架构入门 2.spring cloud 基础入门 3.实战Spring Boot 4.注册中心eureka。",
"studymodel":"201001",
"price":5.6
}
3.3.2.java client
//添加文档
@Test
public void testAddDocument() throws IOException {
//创建“索引请求”对象：索引当动词
IndexRequest indexRequest = new IndexRequest("java06", "course", "1");
indexRequest.source("{\n" +
" \"name\":\"spring cloud实战\",\n" +
" \"descriptio
n\":\"本课程主要从四个章节进行讲解： 1.微服务架构入门 " +
"2.spring cloud 基础入门 3.实战Spring Boot 4.注册中心nacos。\",\n" +
" \"studymodel\":\"201001\",\n" +
" \"price\":5.6\n" +
"}", XContentType.JSON);
IndexResponse indexResponse =
restHighLevelClient.index(indexRequest);
System.out.println(indexResponse.toString());
}
3.4.批量添加文档
支持在一次API调用中，对不同的索引进行操作。支持四种类型的操作：index、create、update、delete。
3.4.1
POST /_bulk
{ action: { metadata }}
{ requestbody }\n
{ action: { metadata }}
{ requestbody }\n
...
.api
POST /_bulk
{"index":{"_index":"java06","_type":"course"}}
{"name":"php实战","description":"php谁都不服","studymodel":"201001","price":"5.6"}
{"index":{"_index":"java06","_type":"course"}}
{"name":"net实战","description":"net从入门到放弃","studymodel":"201001","price":"7.6"}
3.4.2.java client
@Test
public void testBulkAddDocument() throws IOException {
BulkRequest bulkRequest = new BulkRequest();
bulkRequest.add(new IndexRequest("java06", "course").source("{...}",
XContentType.JSON));
bulkRequest.add(new IndexRequest("java06", "course").source("{...}",
XContentType.JSON));
BulkResponse bulkResponse =
restHighLevelClient.bulk(bulkRequest);
System.out.println(bulkResponse.hasFailures());
}
3.5.修改文档
3.5.1.api
PUT /java06/course/1
{
"price":66.6
}
3.5.2.java client
//更新文档
@Test
public void testUpdateDocument() throws IOException {
UpdateRequest updateRequest = new UpdateRequest("java06", "course", "1");
updateRequest.doc("{\n" +
" \"price\":7.6\n" +
"}", XContentType.JSON);
UpdateResponse updateResponse =
restHighLevelClient.update(updateRequest);
System.out.println(updateResponse.getResult());
}
3.6.删除文档
3.6.1.api
DELETE /java06/coures/1
3.6.2.java client
//根据id删除文档
@Test
public void testDelDocument() throws IOException {
//删除请求对象
DeleteRequest deleteRequest = new DeleteRequest("java06","course","1");
//响应对象
DeleteResponse deleteResponse =
restHighLevelClient.delete(deleteRequest);
System.out.println(deleteResponse.getResult());
}
四.文档搜索
提供CDN加速