注意：我的版本是elasticsearch7.6.2、spring-boot-starter-data-elasticsearch-2.5.6
引入依赖
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-data-elasticsearchartifactId>
dependency>
package com.mar.elasticsearchUtils;
import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.ObjectUtil;
import cn.hutool.core.util.StrUtil;
import com.alibaba.fastjson.JSONObject;
import com.google.common.base.Preconditions;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.beanutils.BeanUtils;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.annotation.Id;
import org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate;
import org.springframework.data.elasticsearch.core.IndexOperations;
import org.springframework.data.elasticsearch.core.document.Document;
import org.springframework.data.elasticsearch.core.index.AliasAction;
import org.springframework.data.elasticsearch.core.index.AliasActionParameters;
import org.springframework.data.elasticsearch.core.index.AliasActions;
import org.springframework.data.elasticsearch.core.index.AliasData;
import org.springframework.data.elasticsearch.core.mapping.IndexCoordinates;
import org.springframework.data.elasticsearch.core.query.IndexQuery;
import org.springframework.data.elasticsearch.core.query.IndexQueryBuilder;
import org.springframework.data.elasticsearch.core.query.StringQuery;
import org.springframework.data.elasticsearch.core.query.UpdateQuery;
import org.springframework.stereotype.Component;
import java.lang.reflect.Field;
import java.util.*;
/**
* @author mar
* @date 2021年10月28日 11:34
*/
@Component
@Slf4j
public class EsUtil {
private static ElasticsearchRestTemplate elasticsearchRestTemplate;
@Autowired
public EsUtil(ElasticsearchRestTemplate elasticsearchRestTemplate) {
EsUtil.elasticsearchRestTemplate = elasticsearchRestTemplate;
}
public static <T> boolean createIndex(Class<T> destinationClass, String indexName, String... withAliases) {
if (ObjectUtil.isNull(destinationClass)) throw new RuntimeException("参数类不能为空");
if (StrUtil.isEmpty(indexName)) throw new RuntimeException("参数名不能为空");
if (withAliases == null || withAliases.length <= 0) throw new RuntimeException("索引别名至少有一个");
for (String withAlias : withAliases) {
if (!withAlias.endsWith("_search")) {
throw new RuntimeException("索引别名只能以‘_search’结尾");
}
}
return createIndex(destinationClass, indexName, 3, 2, Integer.MAX_VALUE, withAliases);
}
/**
* 创建索引
*
* @param destinationClass 映射对象
* @param withAliases 别名 必须如："***_search"用来搜索
* @author mar
* @date 2021/10/28 14:54
*/
public static <T> boolean createIndex(Class<T> destinationClass, String indexName, Integer shards, Integer replicas, Integer maxResult, String... withAliases) {
if (ObjectUtil.isNull(destinationClass)) throw new RuntimeException("参数类不能为空");
if (StrUtil.isEmpty(indexName)) throw new RuntimeException("参数名不能为空");
if (withAliases == null || withAliases.length <= 0) throw new RuntimeException("索引别名至少有一个");
for (String withAlias : withAliases) {
if (!withAlias.endsWith("_search")) {
throw new RuntimeException("索引别名只能以‘_search’结尾");
}
}
IndexCoordinates of = IndexCoordinates.of(indexName);
IndexOperations indexOperations = elasticsearchRestTemplate.indexOps(of);
boolean exists = indexOperations.exists();
if (exists) {
indexOperations.delete();
}
Map<String, Object> settings = new HashMap<>();
settings.put("index.number_of_shards", shards > 0 ? shards : 3);
settings.put("index.number_of_replicas", replicas > 0 ? replicas : 2);
settings.put("index.max_result_window", maxResult > 0 ? maxResult : Integer.MAX_VALUE);
Document mapping = indexOperations.createMapping(destinationClass);
indexOperations.create(settings, mapping);
AliasAction.Add add = new AliasAction.Add(AliasActionParameters.builder()
.withIndices(indexName).withAliases(withAliases).build());
return indexOperations.alias(new AliasActions(add));
}
/**
* 根据索引名删除索引
*
* @param indexName 索引名称
* @author mar
* @date 2021/10/28 16:29
*/
public static boolean deleteIndexByName(String indexName) {
return elasticsearchRestTemplate.indexOps(IndexCoordinates.of(indexName)).delete();
}
/**
* 根据索引名判断索引是否存在
*
* @param indexName
* @return boolean
* @author mar
* @date 2021/11/29 16:39
*/
public static boolean isExists(String indexName) {
IndexCoordinates of = IndexCoordinates.of(indexName);
return elasticsearchRestTemplate.indexOps(of).exists();
}
/**
* 获取索引对应的别名
*/
public static Set<String> getAlias(String index) {
if (StrUtil.isEmpty(index)) throw new RuntimeException("索引名不能为空");
Map<String, Set<AliasData>> aliasesForIndex = elasticsearchRestTemplate.indexOps(IndexCoordinates.of(index)).getAliasesForIndex();
Set<String> set = new HashSet<>();
aliasesForIndex.forEach((key, value) -> {
value.forEach(data -> set.add(data.getAlias()));
});
return set;
}
/**
* 为索引添加别名
*
* @param index 真实索引
* @param alias 别名
*/
public static boolean addAlias(String index, String... alias) {
Preconditions.checkNotNull(index);
Preconditions.checkNotNull(alias);
final IndexOperations indexOps = elasticsearchRestTemplate.indexOps(IndexCoordinates.of(index));
AliasActions aliasActions = new AliasActions(new AliasAction.Add(
AliasActionParameters.builder().withIndices(index).withAliases(alias).build()
));
return indexOps.alias(aliasActions);
}
/**
* 为索引删除别名
*
* @param index 真实索引
* @param alias 别名
*/
public static boolean delAlias(String index, String... alias) {
Preconditions.checkNotNull(index);
Preconditions.checkNotNull(alias);
final IndexOperations indexOps = elasticsearchRestTemplate.indexOps(IndexCoordinates.of(index));
AliasActions aliasActions = new AliasActions(new AliasAction.Remove(
AliasActionParameters.builder().withIndices(index).withAliases(alias).build()
));
return indexOps.alias(aliasActions);
}
/**
* 为索引更换别名 旧的换为新的 不会判断旧的是否存在
*
* @param index 真实索引
* @param oldAlias 要删除的别名
* @param newAlias 要新增的别名
*/
public static boolean replaceAlias(String index, String oldAlias, String newAlias) {
Preconditions.checkNotNull(index);
Preconditions.checkNotNull(oldAlias);
Preconditions.checkNotNull(newAlias);
final IndexOperations indexOps = elasticsearchRestTemplate.indexOps(IndexCoordinates.of(index));
final AliasAction.Add add = new AliasAction.Add(AliasActionParameters.builder().withIndices(index).withAliases(newAlias).build());
final AliasAction.Remove remove = new AliasAction.Remove(AliasActionParameters.builder().withIndices(index).withAliases(oldAlias).build());
AliasActions aliasActions = new AliasActions(add, remove);
return indexOps.alias(aliasActions);
}
/**
* 单条数据插入
*
* @param t 待插入的数据实体
* @param indexName 索引名
* @return java.lang.String 返回文档id
*/
public static <T> void saveByEntity(T t, String indexName) {
//这里的 *** 作就是指定文档id
String id = getFieldId(t);
IndexQuery build = new IndexQueryBuilder()
.withId(id)
.withObject(t).build();
elasticsearchRestTemplate.index(build, IndexCoordinates.of(indexName));
}
public static <T> void saveBatchByEntities(Map<String, List<T>> map) {
if (map != null && map.size() > 0)
map.forEach((key, value) -> saveBatchByEntities(value, key));
}
/**
* 批量插入
*
* @param sourceList 待插入的数据实体集合
* @param indexName 索引名
* @return java.util.List 返回idList
*/
public static <T> void saveBatchByEntities(List<T> sourceList, String indexName) {
List<IndexQuery> queryList = new ArrayList<>();
for (T source : sourceList) {
String id = getFieldId(source);
IndexQuery build = new IndexQueryBuilder().withId(id).withObject(source).build();
queryList.add(build);
}
elasticsearchRestTemplate.bulkIndex(queryList, IndexCoordinates.of(indexName));
}
/**
* 单条数据更新
*
* @param entity 待更新的数据实体
* @param indexName 索引名
* @return void
*/
public static <T> void updateByEntity(T entity, String indexName) {
String id = getFieldId(entity);
Map<String, String> map = null;
try {
map = BeanUtils.describe(entity);
} catch (Exception e) {
e.printStackTrace();
}
Document document = Document.from(map);
document.setId(id);
// 这里的UpdateQuery需要构造一个Document对象，但是Document对象不能用实体类转化而来
//（可见Document的源码，位于：org.springframework.data.elasticsearch.core.document
// 包下），因此上面才会BeanUtils.describe(entity)，将实体类转化成一个map，由map转化
// 为Document对象。
//不加默认false。true表示更新时不存在就插入
UpdateQuery build = UpdateQuery.builder(id)
.withDocAsUpsert(false)
.withDocument(document)
.build();
elasticsearchRestTemplate.update(build, IndexCoordinates.of(indexName));
}
/**
* 根据maps批量更新
*
* @param list 待更新的数据实体集合
* @param indexName 索引名
* @return void
* @author Innocence
*/
public static <T> void updateByMaps(List<T> list, String indexName) {
List<Map<String, Object>> maps = listToMap(list);
List<UpdateQuery> updateQueries = new ArrayList<>();
maps.forEach(item -> {
Document document = Document.from(item);
document.setId(String.valueOf(item.get("id")));
UpdateQuery build = UpdateQuery.builder(document.getId())
.withDocument(document)
.build();
updateQueries.add(build);
});
elasticsearchRestTemplate.bulkUpdate(updateQueries, IndexCoordinates.of(indexName));
}
/**
* 根据id删除数据
*
* @param id
* @param indexName 索引名
* @return java.lang.String 被删除的id
*/
public static String deleteById(String id, String indexName) {
return elasticsearchRestTemplate.delete(id, IndexCoordinates.of(indexName));
}
/**
* 根据id批量删除数据
*
* @param docIdName 文档id字段名，如我们上面设置的文档id的字段名为“id”
* @param ids 需要删除的id集合
* @param indexName 索引名称
* @return void
*/
public static void deleteByIds(String docIdName, List<String> ids, String indexName) {
StringQuery query = new StringQuery(QueryBuilders.termsQuery(docIdName, ids).toString());
elasticsearchRestTemplate.delete(query, null, IndexCoordinates.of(indexName));
}
/**
* 递归统计ES聚合的数据
*/
@SneakyThrows
public static <T> Map<T, Long> count(Aggregations aggregations, Class<T> destinationClass) throws NoSuchFieldException, IllegalAccessException {
//返回值封装
Map<T, Long> map = new HashMap<>();
//将t转为JSONObject防止数据值被覆盖
Map<JSONObject, Long> jsonMap = new HashMap<>();
for (Aggregation aggregation : aggregations) {
Terms terms = (Terms) aggregation;
List<? extends Terms.Bucket> buckets = terms.getBuckets();
if (buckets.size() > 0) {
// 如果内部还有aggregation，就继续往下走，不能统计
for (Terms.Bucket bucket : buckets) {
T t = destinationClass.newInstance();
Field declaredField = t.getClass().getDeclaredField(aggregation.getName());
declaredField.setAccessible(true);
declaredField.set(t, bucket.getKeyAsString());
Aggregations aggregationsInners = bucket.getAggregations();
if (aggregationsInners == null || aggregationsInners.asList().size() == 0) {
jsonMap.put((JSONObject) JSONObject.toJSON(t), bucket.getDocCount());
} else {
countIterator(aggregationsInners, jsonMap, t);
}
}
}
}
for (Map.Entry<JSONObject, Long> entry : jsonMap.entrySet()) {
//将json对象转换为java对象
T vo = JSONObject.toJavaObject(entry.getKey(), destinationClass);
map.put(vo, entry.getValue());
}
return map;
}
/**
* 内部递归方法
*/
private static <T> void countIterator(Aggregations aggregations, Map<JSONObject, Long> jsonMap, T destinationClass) throws NoSuchFieldException, IllegalAccessException {
for (Aggregation aggregation : aggregations) {
Terms terms = (Terms) aggregation;
List<? extends Terms.Bucket> buckets = terms.getBuckets();
if (buckets.size() > 0) {
// 如果内部还有aggregation，就继续往下走，不能统计
for (Terms.Bucket bucket : buckets) {
Field declaredField = destinationClass.getClass().getDeclaredField(aggregation.getName());
declaredField.setAccessible(true);
declaredField.set(destinationClass, bucket.getKeyAsString());
Aggregations aggregationsInners = bucket.getAggregations();
if (aggregationsInners == null || aggregationsInners.asList().size() == 0) {
jsonMap.put((JSONObject) JSONObject.toJSON(destinationClass), bucket.getDocCount());
} else {
countIterator(aggregationsInners, jsonMap, destinationClass);
}
}
}
}
}
/**
* 解析出id值
*
* @param t 泛型
* @return java.lang.String
* @author mar
* @date 2021/11/1 16:25
*/
public static <T> String getFieldId(T t) {
String primaryKey = null;
Field[] fields = t.getClass().getDeclaredFields();
Field field;
for (int i = 0; i < fields.length; i++) {
fields[i].setAccessible(true);
}
for (int i = 1; i < fields.length; i++) {
try {
field = t.getClass().getDeclaredField(fields[i].getName());
Id id = field.getAnnotation(Id.class);
if (id != null) {
//打开私有访问
field.setAccessible(true);
primaryKey = (String) field.get(t);
}
} catch (NoSuchFieldException | IllegalAccessException e) {
e.printStackTrace();
}
}
return primaryKey;
}
/**
* 把一个字符串的第一个字母大写、效率是最高的
*
* @param fieldName
* @return java.lang.String
* @author mar
* @date 2021/11/2 15:49
*/
public static String getMethodName(String fieldName) {
byte[] items = fieldName.getBytes();
items[0] = (byte) ((char) items[0] - 'a' + 'A');
return new String(items);
}
/**
* 用于把List
public static <T> List<Map<String, Object>> listToMap(List<T> list) {
List<Map<String, Object>> maps = new ArrayList<>();
try {
for (T t : list) {
Map<String, Object> map = BeanUtil.beanToMap(t);
maps.add(map);
}
return maps;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
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