spring boot 项目中搭建 ElasticSearch 中间件 二 Java api 操作 es
Java api 操作 es
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- 1. 准备
- 2. 环境
- 3. Java操作索引
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- 3.1 创建索引
- 3.2 查看索引
- 3.3 删除索引
- 4. java操作文档
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- 4.1 添加文档
- 4.2 查询文档
- 4.3 查询全部文档
- 4.4 更新文档
- 4.5 删除文档
- 4.6 批量插入文档
- 4.7 批量删除文档
- 4.8 条件查询文档
- 4.9 组合查询文档
- 4.10 模糊查询文档
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本文是进行ElasticSearch 的环境准备和基础操作（使用postman）之后，使用Java进行ElasticSearch 操作的文章。
ElasticSearch 系列文章目的是使用ElasticSearch结合spring boot项目实现项目的搜索功能。
系列文章 ：
spring boot 项目中搭建 ElasticSearch 中间件 一 postman 操作 es
spring boot 项目中搭建 ElasticSearch 中间件 三 spring data 操作 es
1. 准备
首先要创建一个Java maven工程
导入以下依赖：
<dependency>
<groupId>org.elasticsearchgroupId>
<artifactId>elasticsearchartifactId>
<version>7.10.0version>
dependency>
<dependency>
<groupId>org.elasticsearch.clientgroupId>
<artifactId>elasticsearch-rest-high-level-clientartifactId>
<version>7.10.0version>
dependency>
<dependency>
<groupId>com.fasterxml.jackson.coregroupId>
<artifactId>jackson-databindartifactId>
<version>2.9.9version>
dependency>
创建一个es client 后面的操作都是使用这个
RestHighLevelClient
RestHighLevelClient client = new RestHighLevelClient(
RestClient.builder(new HttpHost("localhost", 9200, "http"))
);
写一个简单的实体类，用于与es结构对应
public class Event {
private Long id;
private String name;
private String type;
private String place;
private String phone;
private String mail;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getPlace() {
return place;
}
public void setPlace(String place) {
this.place = place;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public String getMail() {
return mail;
}
public void setMail(String mail) {
this.mail = mail;
}
@Override
public String toString() {
return "Event{" +
"id=" + id +
", name='" + name + '\'' +
", type='" + type + '\'' +
", place='" + place + '\'' +
", phone='" + phone + '\'' +
", mail='" + mail + '\'' +
'}';
}
}
2. 环境
本文使用 elasticsearch-7.10.0
不同的jdk版本要使用适配的es版本
最新es与jdk适配图
elasticsearch-7.10.0-windows-x86_64\elasticsearch-7.10.0\bin
下载后在bin中点击 elasticsearch.bat 启动es
默认端口是9200
3. Java操作索引
3.1 创建索引
注：以下操作 以索引名为
event为例
注：入参client为前面创建的RestHighLevelClient
注：MyLog.logger是我自己的log插件，可以替换使用普通sout输出
private void insertDoc(RestHighLevelClient client) throws IOException {
//插入文档
IndexRequest indexRequest = new IndexRequest();
indexRequest.index("event").id("1001");
Event event = new Event();
event.setName("赛事");
event.setType("攻击");
ObjectMapper mapper = new ObjectMapper();
String jsonArr = mapper.writeValueAsString(event);
indexRequest.source(jsonArr, XContentType.JSON);
IndexResponse indexResponse = client.index(indexRequest, RequestOptions.DEFAULT);
//响应状态
MyLog.logger.info("插入文档 状态 ：" + indexResponse.getResult() + " 响应 ：" + jsonArr);
}
3.2 查看索引
private void searchIndex(RestHighLevelClient client) throws IOException {
//查询索引
GetIndexRequest userRequest = new GetIndexRequest("event");
GetIndexResponse getIndexResponse = client.indices().get(userRequest, RequestOptions.DEFAULT);
//响应状态
Map<String, List<AliasMetadata>> aliases = getIndexResponse.getAliases();
Map<String, MappingMetadata> mappings = getIndexResponse.getMappings();
Map<String, Settings> settings = getIndexResponse.getSettings();
MyLog.logger.info("查询索引 响应 ：" + aliases + mappings + settings);
}
3.3 删除索引
private void deleteIndex(RestHighLevelClient client) throws IOException {
//删除索引
DeleteIndexRequest userRequest = new DeleteIndexRequest("event");
AcknowledgedResponse response = client.indices().delete(userRequest, RequestOptions.DEFAULT);
//响应状态
MyLog.logger.info("删除索引 状态 ：" + response.isAcknowledged());
}
4. java操作文档
4.1 添加文档
注：以下操作 以索引名为
event为例
private void insertDoc(RestHighLevelClient client) throws IOException {
//插入文档
IndexRequest indexRequest = new IndexRequest();
indexRequest.index("event").id("1001");
Event event = new Event();
event.setName("赛事");
event.setType("攻击");
ObjectMapper mapper = new ObjectMapper();
String jsonArr = mapper.writeValueAsString(event);
indexRequest.source(jsonArr, XContentType.JSON);
IndexResponse indexResponse = client.index(indexRequest, RequestOptions.DEFAULT);
//响应状态
MyLog.logger.info("插入文档 状态 ：" + indexResponse.getResult() + " 响应 ：" + jsonArr);
}
4.2 查询文档
private void getDoc(RestHighLevelClient client, String id) throws IOException {
//查询文档
GetRequest getRequest = new GetRequest();
getRequest.index("event").id(id);
GetResponse getResponse = client.get(getRequest, RequestOptions.DEFAULT);
//响应状态
MyLog.logger.info("查询文档 响应 ：" + getResponse.getSourceAsString());
}
4.3 查询全部文档
private void searchDoc(RestHighLevelClient client) throws IOException {
//查询全部文档
SearchRequest searchRequest = new SearchRequest();
searchRequest.indices("event");
searchRequest.source(new SearchSourceBuilder().query(QueryBuilders.matchAllQuery()));
SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
//响应状态
SearchHits hits = searchResponse.getHits();
MyLog.logger.info("查询全部文档 响应 ：" + hits.getTotalHits());
for (SearchHit hit : hits) {
MyLog.logger.info("查询全部文档 数据 ：" + hit.getSourceAsString());
}
}
4.4 更新文档
private void updateDoc(RestHighLevelClient client) throws IOException {
//更新文档
UpdateRequest updateRequest = new UpdateRequest();
updateRequest.index("event").id("1001");
Event event = new Event();
event.setType("防御");
ObjectMapper mapper = new ObjectMapper();
String jsonArr = mapper.writeValueAsString(event);
updateRequest.doc(XContentType.JSON, "type", "防御");
UpdateResponse updateResponse = client.update(updateRequest, RequestOptions.DEFAULT);
//响应状态
MyLog.logger.info("更新文档 状态 ：" + updateResponse.getResult() + " 响应 ：" + jsonArr);
}
4.5 删除文档
private void deleteDoc(RestHighLevelClient client) throws IOException {
//删除文档
DeleteRequest deleteRequest = new DeleteRequest();
deleteRequest.index("event").id("1001");
DeleteResponse deleteResponse = client.delete(deleteRequest, RequestOptions.DEFAULT);
//响应状态
MyLog.logger.info("删除文档 响应 ：" + deleteResponse.toString());
}
4.6 批量插入文档
private void insertBatchDoc(RestHighLevelClient client, List<Event> events) throws IOException {
//批量插入文档
BulkRequest bulkRequest = new BulkRequest();
for (Event event : events) {
IndexRequest indexRequest = new IndexRequest()
.index("event").id(event.getId().toString())
.source(new ObjectMapper().writeValueAsString(event), XContentType.JSON);
bulkRequest.add(indexRequest);
//插入完成后立即强制刷新索引
bulkRequest.setRefreshPolicy(WriteRequest.RefreshPolicy.IMMEDIATE);
}
BulkResponse bulkResponse = client.bulk(bulkRequest, RequestOptions.DEFAULT);
//响应状态
MyLog.logger.info("批量插入文档 响应 ：" + Arrays.toString(bulkResponse.getItems()));
}
4.7 批量删除文档
private void deleteBatchDoc(RestHighLevelClient client) throws IOException {
//批量删除文档
BulkRequest bulkRequest = new BulkRequest();
DeleteRequest request1 = new DeleteRequest()
.index("event").id("1002");
DeleteRequest request2 = new DeleteRequest()
.index("event").id("1003");
bulkRequest.add(request1).add(request2);
//删除完成后立即强制刷新索引
bulkRequest.setRefreshPolicy(WriteRequest.RefreshPolicy.IMMEDIATE);
BulkResponse bulkResponse = client.bulk(bulkRequest, RequestOptions.DEFAULT);
//响应状态
MyLog.logger.info("批量删除文档 响应 ：" + Arrays.toString(bulkResponse.getItems()));
}
4.8 条件查询文档
private void searchTermDoc(RestHighLevelClient client) throws IOException {
//查询条件文档
SearchRequest searchRequest = new SearchRequest();
searchRequest.indices("event");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
//条件
searchSourceBuilder.query(QueryBuilders.termQuery("type", "128"));
//分页
searchSourceBuilder.size(5);
searchSourceBuilder.from(0);
//排序
searchSourceBuilder.sort("id", SortOrder.DESC);
//管理字段
String[] excludes = {};
String[] includes = {"name"};
searchSourceBuilder.fetchSource(includes, excludes);
searchRequest.source(searchSourceBuilder);
SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
//响应状态
SearchHits hits = searchResponse.getHits();
MyLog.logger.info("查询条件文档 响应 ：" + hits.getTotalHits());
for (SearchHit hit : hits) {
MyLog.logger.info("查询条件文档 数据 ：" + hit.getSourceAsString());
}
}
4.9 组合查询文档
private void searchGroupDoc(RestHighLevelClient client) throws IOException {
//组合查询文档
SearchRequest searchRequest = new SearchRequest();
searchRequest.indices("event");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
boolQueryBuilder.must(QueryBuilders.matchQuery("type", 13.6));
boolQueryBuilder.must(QueryBuilders.matchQuery("name", "北京"));
searchSourceBuilder.query(boolQueryBuilder);
searchRequest.source(searchSourceBuilder);
SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
//响应状态
SearchHits hits = searchResponse.getHits();
MyLog.logger.info("查询组合条件文档 响应 ：" + hits.getTotalHits());
for (SearchHit hit : hits) {
MyLog.logger.info("查询组合条件文档 数据 ：" + hit.getSourceAsString());
}
}
4.10 模糊查询文档
private void searchFuzzyDoc(RestHighLevelClient client) throws IOException {
//模糊查询文档
SearchRequest searchRequest = new SearchRequest();
searchRequest.indices("event");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
FuzzyQueryBuilder fuzzyQueryBuilder = QueryBuilders.fuzzyQuery("name", "上海").fuzziness(Fuzziness.ONE);
//高亮
HighlightBuilder highlightBuilder = new HighlightBuilder();
highlightBuilder.preTags("");
highlightBuilder.postTags("");
highlightBuilder.field("name");
searchSourceBuilder.highlighter(highlightBuilder);
searchSourceBuilder.query(fuzzyQueryBuilder);
searchRequest.source(searchSourceBuilder);
SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
//响应状态
SearchHits hits = searchResponse.getHits();
MyLog.logger.info("模糊查询文档 响应 ：" + hits.getTotalHits());
for (SearchHit hit : hits) {
MyLog.logger.info("模糊查询文档 数据 ：" + hit.getSourceAsString());
}
}