我正在尝试使用最新版本的Elastic Search库，该库已经在maven存储库中提供。
<dependency>
<groupId>org.elasticsearch</groupId>
<artifactId>elasticsearch</artifactId>
<version>7.0.0</version>
</dependency>
但是不确定如何在导入了6.5的Spring Boot中使用第七版。 我的Maven依赖项：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>
答案 0 :(得分：7)
因为我们真的不知道何时发布 Spring Data Elastic Search 4.x ，所以我发布了整合当前 Spring的方式数据弹性搜索 4.x 和稳定的 Spring Boot 2.1.7 。如果您想使用Spring Repositories和最新的Elastic Search，它可能是您的临时解决方法。
1）在依赖项中强制使用最新的弹性搜索客户端（在我的情况下为： build.gradle ）
dependencies {
//Force spring-data to use the newest elastic-search client
//this should removed as soon as spring-data-elasticsearch:4.0.0 is released!
implementation('org.springframework.data:spring-data-elasticsearch:4.0.0.BUILD-SNAPSHOT') {
exclude group: 'org.elasticsearch'
exclude group: 'org.elasticsearch.plugin'
exclude group: 'org.elasticsearch.client'
}
implementation('org.elasticsearch:elasticsearch:7.3.0') { force = true }
implementation('org.elasticsearch.client:elasticsearch-rest-high-level-client:7.3.0') { force = true }
implementation('org.elasticsearch.client:elasticsearch-rest-client:7.3.0') { force = true }
}
2）禁用弹性搜索自动配置和运行状况检查组件，因为它们变得不兼容（您稍后可能要实施自己的运行状况检查）。
@SpringBootApplication(exclude = {ElasticsearchAutoConfiguration.class, ElasticSearchRestHealthIndicatorAutoConfiguration.class})
@EnableElasticsearchRepositories
public class SpringBootApp {
public static void main(String[] args) {
SpringApplication.run(SpringBootApp.class, args);
}
}
3）禁用自动配置后，我们需要自行初始化ElasticsearchRestTemplate。我们还需要这样做以提供自定义MappingElasticsearchConverter以避免类不兼容。
/**
* Manual configuration to support the newest ElasticSearch that is currently not supported by {@link org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchAutoConfiguration}.
*
* @author aleksanderlech
*/
@Configuration
@EnableConfigurationProperties(ElasticsearchProperties.class)
public class ElasticSearchConfiguration {
@Primary
@Bean
public ElasticsearchRestTemplate elasticsearchTemplate(ElasticsearchProperties configuration) {
var nodes = Stream.of(configuration.getClusterNodes().split(",")).map(HttpHost::create).toArray(HttpHost[]::new);
var client = new RestHighLevelClient(RestClient.builder(nodes));
var converter = new CustomElasticSearchConverter(new SimpleElasticsearchMappingContext(), createConversionService());
return new ElasticsearchRestTemplate(client, converter, new DefaultResultMapper(converter));
}
private DefaultConversionService createConversionService() {
var conversionService = new DefaultConversionService();
conversionService.addConverter(new StringToLocalDateConverter());
return conversionService;
}
}
CustomElasticSearchConverter：
/**
* Custom version of {@link MappingElasticsearchConverter} to support newest Spring Data Elasticsearch integration that supports ElasticSearch 7. Remove when Spring Data Elasticsearch 4.x is released.
*/
class CustomElasticSearchConverter extends MappingElasticsearchConverter {
private CustomConversions conversions = new ElasticsearchCustomConversions(Collections.emptyList());
CustomElasticSearchConverter(MappingContext<? extends ElasticsearchPersistentEntity<?>, ElasticsearchPersistentProperty> mappingContext) {
super(mappingContext);
setConversions(conversions);
}
CustomElasticSearchConverter(MappingContext<? extends ElasticsearchPersistentEntity<?>, ElasticsearchPersistentProperty> mappingContext, GenericConversionService conversionService) {
super(mappingContext, conversionService);
setConversions(conversions);
}
@Override
protected <R> R readValue(@Nullable Object source, ElasticsearchPersistentProperty property,
TypeInformation<R> targetType) {
if (source == null) {
return null;
}
if (source instanceof List) {
return readCollectionValue((List) source, property, targetType);
}
return super.readValue(source, property, targetType);
}
private Object readSimpleValue(@Nullable Object value, TypeInformation<?> targetType) {
Class<?> target = targetType.getType();
if (value == null || target == null || ClassUtils.isAssignableValue(target, value)) {
return value;
}
if (conversions.hasCustomReadTarget(value.getClass(), target)) {
return getConversionService().convert(value, target);
}
if (Enum.class.isAssignableFrom(target)) {
return Enum.valueOf((Class<Enum>) target, value.toString());
}
return getConversionService().convert(value, target);
}
private <R> R readCollectionValue(@Nullable List<?> source, ElasticsearchPersistentProperty property,
TypeInformation<R> targetType) {
if (source == null) {
return null;
}
Collection<Object> target = createCollectionForValue(targetType, source.size());
for (Object value : source) {
if (isSimpleType(value)) {
target.add(
readSimpleValue(value, targetType.getComponentType() != null ? targetType.getComponentType() : targetType));
} else {
if (value instanceof List) {
target.add(readValue(value, property, property.getTypeInformation().getActualType()));
} else {
target.add(readEntity(computeGenericValueTypeForRead(property, value), (Map) value));
}
}
}
return (R) target;
}
private Collection<Object> createCollectionForValue(TypeInformation<?> collectionTypeInformation, int size) {
Class<?> collectionType = collectionTypeInformation.isCollectionLike()//
? collectionTypeInformation.getType() //
: List.class;
TypeInformation<?> componentType = collectionTypeInformation.getComponentType() != null //
? collectionTypeInformation.getComponentType() //
: ClassTypeInformation.OBJECT;
return collectionTypeInformation.getType().isArray() //
? new ArrayList<>(size) //
: CollectionFactory.createCollection(collectionType, componentType.getType(), size);
}
private ElasticsearchPersistentEntity<?> computeGenericValueTypeForRead(ElasticsearchPersistentProperty property,
Object value) {
return ClassTypeInformation.OBJECT.equals(property.getTypeInformation().getActualType())
? getMappingContext().getRequiredPersistentEntity(value.getClass())
: getMappingContext().getRequiredPersistentEntity(property.getTypeInformation().getActualType());
}
private boolean isSimpleType(Object value) {
return isSimpleType(value.getClass());
}
private boolean isSimpleType(Class<?> type) {
return conversions.isSimpleType(type);
}
}
答案 1 :(得分：1)
如果有人正在使用 Spring Boot 2.1.2 和 Kotlin ，则以下代码可能会对您有所帮助。我只是从@Alexander Lech答案中翻译过来的，做了一些小的更改：
首先更改为Alexanders答案：
+-----------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------+-------------+------+-----+---------+----------------+
| Id | int(11) | NO | PRI | NULL | auto_increment |
| TimeStamp | datetime(6) | NO | | NULL | |
| Poster | longtext | YES | | NULL | |
| Body | longtext | YES | | NULL | |
+-----------+-------------+------+-----+---------+----------------+
我必须排除@SpringBootApplication(exclude = [ElasticsearchAutoConfiguration::class,
ElasticsearchDataAutoConfiguration::class])
才能使其正常工作。
第二：由于我们使用Kotlin，并且自定义转换器包含很多代码，因此对Kotlin的这种翻译可能会帮助某些人：
ElasticsearchDataAutoConfiguration此后，解决了一些存储库查询的问题。另请注意，不要使用class CustomElasticSearchConverter(mappingContext: MappingContext<out ElasticsearchPersistentEntity<*>, ElasticsearchPersistentProperty>, customConversionService: GenericConversionService?) : MappingElasticsearchConverter(mappingContext, customConversionService) {
private val conversionsNew = ElasticsearchCustomConversions(emptyList<Any>())
init {
setConversions(conversionsNew)
}
override fun <R : Any?> readValue(source: Any?, property: ElasticsearchPersistentProperty, targetType: TypeInformation<R>): R? {
if (source == null) {
return null
}
if (source is Collection<*>) {
return readCollectionValue(source, property, targetType) as R?;
}
return super.readValue(source, property, targetType);
}
private fun readCollectionValue(source: Collection<*>?, property: ElasticsearchPersistentProperty, targetType: TypeInformation<*>): Any? {
if (source == null) {
return null
}
val target = createCollectionForValue(targetType, source.size)
for (value in source) {
require(value != null) { "value must not be null" }
if (isSimpleType(value)) {
target.add(readSimpleValue(value, if (targetType.componentType != null) targetType.componentType!! else targetType))
} else {
if (value is MutableCollection<*>) {
target.add(readValue(value, property, property.typeInformation.actualType as TypeInformation<out Any>))
} else {
@Suppress("UNCHECKED_CAST")
target.add(readEntity(computeGenericValueTypeForRead(property, value), value as MutableMap<String, Any>?))
}
}
}
return target
}
private fun readSimpleValue(value: Any?, targetType: TypeInformation<*>): Any? {
val target = targetType.type
@Suppress("SENSELESS_COMPARISON")
if (value == null || target == null || ClassUtils.isAssignableValue(target, value)) {
return value
}
if (conversionsNew.hasCustomReadTarget(value.javaClass, target)) {
return conversionService.convert(value, target)
}
@Suppress("UNCHECKED_CAST")
return when {
Enum::class.java.isAssignableFrom(target) -> enumByName(target as Class<Enum<*>>, value.toString())
else -> conversionService.convert(value, target)
}
}
private fun enumByName(target: Class<Enum<*>>, name: String): Enum<*> {
val enumValue = target.enumConstants.find { it.name == name }
require(enumValue != null) { "no enum value found for name $name and targetClass $target" }
return enumValue
}
private fun createCollectionForValue(collectionTypeInformation: TypeInformation<*>, size: Int): MutableCollection<Any?> {
val collectionType = when {
collectionTypeInformation.isCollectionLike -> collectionTypeInformation.type
else -> MutableList::class.java
}
val componentType = when {
collectionTypeInformation.componentType != null -> collectionTypeInformation.componentType
else -> ClassTypeInformation.OBJECT
}
return when {
collectionTypeInformation.type.isArray -> ArrayList(size)
else -> CollectionFactory.createCollection(collectionType, componentType!!.type, size)
}
}
private fun computeGenericValueTypeForRead(property: ElasticsearchPersistentProperty, value: Any): ElasticsearchPersistentEntity<*> {
return when {
ClassTypeInformation.OBJECT == property.typeInformation.actualType -> mappingContext.getRequiredPersistentEntity(value.javaClass)
else -> mappingContext.getRequiredPersistentEntity(property.typeInformation.actualType!!)
}
}
private fun isSimpleType(value: Any): Boolean {
return isSimpleType(value.javaClass)
}
private fun isSimpleType(type: Class<*>): Boolean {
return conversionsNew.isSimpleType(type)
}
}
，而要使用spring-boot-starter-data-elasticsearch。 （这花了我一些时间）。
是的，代码很丑陋，但是在发布spring-data-elasticsearch:4.0.0.BUILD-SNAPSHOT之后，您可以将其丢弃。