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
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>
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
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(); } }
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}]
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!!!
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
@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();; } }
@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); } } }
https://gitee.com/zhengqingya/java-workspace