一、前言
本文将基于springboot 2.1.8.RELEASE
来整合 Elasticsearch
环境:elasticsearch-5.6.16
温馨小提示:
ES服务端
或Kibana客户端
官网下载地址: https://www.elastic.co/downloads/past-releases
二、Spring Boot 整合 Elasticsearch
1、pom.xml
中引入es依赖
<!-- spring data es -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>
2、application.yml
中配置es
spring:
# es相关配置
data:
elasticsearch:
# 配置集群名
cluster-name: elasticsearch # 访问 es服务端 `http://127.0.0.1:9200/` 填写 `cluster_name` 对应的值
# 配置节点信息,逗号分隔,如果没有指定,则启动ClientNode 【 注:9200->图形界面端、9300->程序端 】
cluster-nodes: 127.0.0.1:9300
# 开启 Elasticsearch 仓库(默认值:true)
repositories:
enabled: true
3、redis和es冲突问题
如上配置后,可以先启动一下项目,可能运行后会出现如下问题:
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'elasticsearchClient' defined in class path resource [org/springframework/boot/autoconfigure/data/elasticsearch/ElasticsearchAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.elasticsearch.client.transport.TransportClient]: Factory method 'elasticsearchClient' threw exception; nested exception is java.lang.IllegalStateException: availableProcessors is already set to [8], rejecting [8]
错误原因:程序的其他地方使用了Netty,这里指redis。这影响在实例化传输客户端之前初始化处理器的数量。 实例化传输客户端时,我们尝试初始化处理器的数量。 由于在其他地方使用Netty,因此已经初始化并且Netty会对此进行防范,因此首次实例化会因看到的非法状态异常而失败。
解决:在启动类中加上如下配置
System.setProperty("es.set.netty.runtime.available.processors","false");
注:虽然上面的方式能解决错误,服务可以正常启动,但是启动测试类时还是会报错哦!!!
因此es配置文件中需配置在RedisConfig
之前装配,并且指定初始化时再一次添加忽略es中netty的一些配置!!!
ElasticsearchConfig
配置文件如下:
@Configuration
@AutoConfigureBefore(RedisConfig.class) // `RedisConfig.class`为redis配置文件
public class ElasticsearchConfig {
@PostConstruct
void init() {
System.setProperty("es.set.netty.runtime.available.processors", "false");
}
@Bean(name = "elasticsearchTemplate")
public ElasticsearchTemplate elasticsearchTemplate(Client client, ElasticsearchConverter converter) {
try {
return new ElasticsearchTemplate(client, converter);
} catch (Exception ex) {
throw new IllegalStateException(ex);
}
}
@Bean
public ElasticsearchConverter elasticsearchConverter(
SimpleElasticsearchMappingContext mappingContext) {
return new MappingElasticsearchConverter(mappingContext);
}
@Bean
public SimpleElasticsearchMappingContext mappingContext() {
return new SimpleElasticsearchMappingContext();
}
}
4、问题:failed to load elasticsearch nodes
如果出现如下问题:
failed to load elasticsearch nodes : org.elasticsearch.client.transport.NoNodeAvailableException: None of the configured nodes are available: [{#transport#-1}{6VrRZl9ISEy3MT0rx2Vd2w}{127.0.0.1}{127.0.0.1:9300}]
① 尝试修改es服务端配置文件 network.host: 127.0.0.1
②
cluster-name
集群名是否一致
③ 如果检查完以上2种情况后,还是报同样的错误,就要考虑是否为版本问题哦,小编刚开始处于新鲜感使用的是目前最新版elasticsearch-7.5.1
,而spring-boot-starter-data-elasticsearch
中的spring-data-elasticsearch3.1.10.RELEASE
版本不支持高版本的es,因此版本选择要注意哦!!!
三、Elasticsearch增删改查API
1、创建索引并建立类型映射
温馨小提示:注意包名不要导错哦!!!
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.data.annotation.Id;
import org.springframework.data.elasticsearch.annotations.Document;
import org.springframework.data.elasticsearch.annotations.Field;
import org.springframework.data.elasticsearch.annotations.FieldType;
/**
* <p> 测试 </p>
*
* @author : zhengqing
* @description : indexName:索引库 type:类型(可理解为mysql数据库中的表名)
* @date : 2019/12/27 14:47
*/
@Data
@NoArgsConstructor
@AllArgsConstructor
@Document(indexName = "zq_test", type = "user")
public class User {
@Id
private Long id;
@Field(type = FieldType.Keyword)
private String name;
// @Field(type = FieldType.Text, analyzer = "ik_max_word", searchAnalyzer = "ik_max_word")
private String intro;
@Field(type = FieldType.Integer)
private Integer age;
}
@Component
public interface UserRepository extends ElasticsearchRepository<User, Long> { }
@RunWith(SpringRunner.class)
@SpringBootTest(classes = DemoApplication.class)
public class ESTest {
@Autowired
private ElasticsearchTemplate template;
/**
* 创建索引,并且建立类型映射
*/
@Test
public void test() throws Exception {
// 创建索引
template.createIndex(User.class);
// 类型映射 - 自定义映射
template.putMapping(User.class);
}
}
运行后,在 http://127.0.0.1:5601/app/kibana#/dev_tools 中执行命令 GET zq_test/_mapping/user
查看类型映射
2、简单的增删改查
@RunWith(SpringRunner.class)
@SpringBootTest(classes = DemoApplication.class)
public class ESTest {
@Autowired
private UserRepository repository;
@Test // 新增1个
public void testAdd() throws Exception {
User user = new User(1L, "zheng qing", "zheng qing is a programmer!", 18);
repository.save(user);
}
@Test // 批量添加
public void testBatchAdd() throws Exception {
List<User> list = new ArrayList<>();
for (int i = 0; i < 20; i++) {
User user = new User(i + 2L, "zheng qing" + i + 1, "zheng qing is a programmer!", 18 + i );
list.add(user);
}
repository.saveAll(list);
}
@Test // 获取1个
public void testGetOne() throws Exception {
System.out.println(repository.findById(1L));
}
@Test // 获取全部
public void testGetAll() throws Exception {
Iterable<User> all = repository.findAll();
for (User user : all) {
System.out.println(user);
}
}
@Test // 新增、修改 (判断是否有id即可~)
public void testUpdate() throws Exception {
Optional<User> byId = repository.findById(1L);
User user = byId.get();
System.out.println(user);
user.setName("zq");
repository.save(user);
System.out.println(repository.findById(1L));
}
@Test // 删除
public void testDel() throws Exception {
repository.deleteById(1L);
//repository.deleteAll();;
}
}
3、高级查询(过滤)+分页+排序
@RunWith(SpringRunner.class)
@SpringBootTest(classes = DemoApplication.class)
public class ESTest {
@Autowired
private UserRepository repository;
@Test // DSL查询与过滤+分页+排序
public void testNativeSearchQueryBuilder() throws Exception {
NativeSearchQueryBuilder builder = new NativeSearchQueryBuilder();
BoolQueryBuilder bool = QueryBuilders.boolQuery();
//模糊查询
bool.must(QueryBuilders.matchQuery("intro", "zheng"));
//精确过滤
List<QueryBuilder> filters = bool.filter();
filters.add(QueryBuilders.rangeQuery("age").gte(0).lte(200));
builder.withQuery(bool); //query bool must(filter)
//排序
builder.withSort(SortBuilders.fieldSort("age").order(SortOrder.ASC));
//分页 注:当前页从0开始
builder.withPageable(PageRequest.of(0, 10));
//截取字段
builder.withSourceFilter(new FetchSourceFilter(new String[]{"name", "age"}, null));
//构造查询条件
NativeSearchQuery query = builder.build();
//查询
Page<User> page = repository.search(query);
System.out.println("总数:" + page.getTotalElements());
System.out.println("总页数:" + page.getTotalPages());
for (User user : page.getContent()) {
System.out.println(user);
}
}
}