1、new springboot项目 （看项目记得配环境，如jdk）
问题：一定要保证我们导入的依赖和我们es版本一致
编写config配置类
package com.kuang.config;
import org.apache.http.HttpHost;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class ElasticSerachClientConfig {
@Bean
public RestHighLevelClient restHighLevelClient(){
RestHighLevelClient client = new RestHighLevelClient(
RestClient.builder(
new HttpHost("127.0.0.1",9200,"http")));
return client;
}
}
要开启elasticsearch客户端哦~
package com.kuang;
import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;
import org.elasticsearch.action.support.master.AcknowledgedResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.indices.CreateIndexRequest;
import org.elasticsearch.client.indices.CreateIndexResponse;
import org.elasticsearch.client.indices.GetIndexRequest;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.test.context.SpringBootTest;
import java.io.IOException;
@SpringBootTest
class KuangshenEsApiApplicationTests {
@Autowired
@Qualifier("restHighLevelClient")
private RestHighLevelClient client;
//测试索引的创建 request
@Test
void testCreateIndex() throws IOException {
//1.创建索引请求
CreateIndexRequest request = new CreateIndexRequest("kuang_index");
//2.客户端执行请求
CreateIndexResponse createIndexResponse = client.indices().create(request, RequestOptions.DEFAULT);
System.out.println(createIndexResponse);
}
//测试获取索引,只能判断是否存在
@Test
void testExistIndex() throws IOException {
GetIndexRequest request = new GetIndexRequest("kuang_index");
boolean exists = client.indices().exists(request, RequestOptions.DEFAULT);
System.out.println(exists); //true
}
@Test
void testDeleteIndex() throws IOException {
DeleteIndexRequest request = new DeleteIndexRequest("kuang_index");
AcknowledgedResponse delete = client.indices().delete(request, RequestOptions.DEFAULT);
System.out.println(delete.isAcknowledged()); //true
}
}
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.61</version>
</dependency>
实体类
@Data
@NoArgsConstructor
@AllArgsConstructor
@Component
public class User {
private String name;
private int age;
}
测试类
//测试添加文档
@Test
void testAdd() throws IOException {
//创建对象
User user = new User("狂神说", 3);
//创建请求
IndexRequest request = new IndexRequest("kuang_index");
//规则 put /kuang_index/_doc/1
request.id("1");
request.timeout(TimeValue.timeValueSeconds(1));
request.timeout("1s");
//将我们的数据放入请求 json
request.source(JSON.toJSONString(user), XContentType.JSON);
//客户端发送请求
IndexResponse indexResponse = client.index(request, RequestOptions.DEFAULT);
System.out.println(indexResponse.toString());
System.out.println(indexResponse.status());//CREATED
}
//获取文档，判断是否存在 get /index/_doc/1
@Test
void testIsExists() throws IOException {
GetRequest getRequest = new GetRequest("kuang_index", "1");
//不获取返回的_source的上下文了
getRequest.fetchSourceContext(new FetchSourceContext(false));
getRequest.storedFields("_none_");
boolean exists = client.exists(getRequest, RequestOptions.DEFAULT);
System.out.println(exists);//true
}
//获取文档的信息
@Test
void testGetDocument() throws IOException {
GetRequest getRequest = new GetRequest("kuang_index", "1");
GetResponse getResponse = client.get(getRequest, RequestOptions.DEFAULT);
System.out.println(getResponse.getSourceAsString());//打印文档的内容 {"age":3,"name":"狂神说"}
System.out.println(getResponse);//返回的全部内容和命令式是一样的
}
//更新文档的信息
@Test
void testUpdateRequest() throws IOException {
UpdateRequest updateRequest = new UpdateRequest("kuang_index", "1");
updateRequest.timeout("1s");
User user = new User("狂神说Java", 18);
updateRequest.doc(JSON.toJSONString(user),XContentType.JSON);
UpdateResponse update = client.update(updateRequest, RequestOptions.DEFAULT);
System.out.println(update.status());//OK
}
//删除文档记录
@Test
void testDeleteRequest() throws IOException {
DeleteRequest request = new DeleteRequest("kuang_index", "1");
request.timeout("1s");
DeleteResponse delete = client.delete(request, RequestOptions.DEFAULT);
System.out.println(delete.status());//OK
}
// 特殊的，真的项目一般都会批量插入数据！
@Test
void testBulkRequest() throws IOException {
BulkRequest bulkRequest = new BulkRequest();
bulkRequest.timeout("10s");
ArrayList<User> userList = new ArrayList<>();
userList.add(new User("kuangshen1",3));
userList.add(new User("kuangshen2",3));
userList.add(new User("kuangshen3",3));
userList.add(new User("zhangsan1",3));
userList.add(new User("zhangsan2",3));
userList.add(new User("zhangsan3",3));
//批处理请求
for (int i=0;i<userList.size();i++){
//批量更新和批量删除，就在这里修改对应的请求就可以了 不设置id会有随机id 乱七八糟的
bulkRequest.add(
new IndexRequest("kuang_index").id(""+(i+1)).source(
JSON.toJSONString(userList.get(i)),XContentType.JSON));
}
BulkResponse bulk = client.bulk(bulkRequest, RequestOptions.DEFAULT);
System.out.println(bulk.hasFailures());// 是否失败 false 代表成功
}
//查询
// searchRequest 搜索请求
//SearchSourceBuilder 条件构造
// HighlightBuilder 构建高亮
//termQueryBuilder 精确查询
@Test
void testSearch() throws IOException {
SearchRequest searchRequest = new SearchRequest("kuang_index");
//构建搜索条件
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
//查询条件 我们可以使用QueryBuilders 工具来实现
//termQuery 精确查询
//QueryBuilders.matchAllQuery(); 匹配所有
//中文查不出来，name改为name.keyword
TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("name", "zhangsan1");
// MatchAllQueryBuilder matchAllQueryBuilder = QueryBuilders.matchAllQuery();
sourceBuilder.query(termQueryBuilder);
sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));
searchRequest.source(sourceBuilder);
SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
System.out.println(JSON.toJSONString(searchResponse.getHits()));
System.out.println("=================");
for (SearchHit documentFields:searchResponse.getHits().getHits()){
System.out.println(documentFields.getSourceAsMap());
}
}