ElasticSearch7.3 JAVA API查询 删除
在7.3版本中，已经不推荐使用TransportClient这个client，官网说在8.0以后的版本TransportClient将会被删除，并且推荐大家使用高阶版本的REST CLIENT -> RestHighLevelClient，本文使用的是7.3的RestHighLevelClient。
关于RestHighLevelClient，官网给的文档非常的详细，SO EASY。
本文只给出常用的查询和删除操作实例。
查询原始表结构如下：
CREATE TABLE `article` (
`id` varchar(255) NOT NULL,
`title` varchar(255) DEFAULT NULL,
`content` longtext,
`createdate` datetime DEFAULT NULL,
`editdate` datetime DEFAULT NULL,
`viewnums` int(11) DEFAULT '0',
`likenums` int(11) DEFAULT '0',
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
elasticsearch中的index如下
{
"mapping": {
"properties": {
"@timestamp": {
"type": "date"
},
"@version": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
},
"content": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
},
"createdate": {
"type": "date"
},
"editdate": {
"type": "date"
},
"id": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
},
"likenums": {
"type": "long"
},
"title": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
},
"type": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
},
"viewnums": {
"type": "long"
}
}
}
}下面是SpringBoot工程中的Controller和Service，Service中包含了删除和查询的方法，以及注释。
Controller
package com.zzj.cloud.esclient.controller;
import com.zzj.cloud.esclient.services.ESRestService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class ESController {
@Autowired
private ESRestService esRestService;
@GetMapping("/")
public String all(){
String article = "";
article = esRestService.getStringById("","");
return article;
}
@GetMapping("/search")
public String search(String content ){
String article = "";
article = esRestService.searchArticle(content);
return article;
}
@GetMapping("/delete")
public long delete(String title ){
long deleteNum = esRestService.deleteArticle(title);
return deleteNum;
}
}
Service
package com.zzj.cloud.esclient.services;
import org.apache.http.HttpHost;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.delete.DeleteRequest;
import org.elasticsearch.action.delete.DeleteResponse;
import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.unit.Fuzziness;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.rest.RestStatus;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.springframework.stereotype.Component;
import javax.websocket.ClientEndpoint;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;
@Component
public class ESRestService {
private RestHighLevelClient client;
public ESRestService() {
RestHighLevelClient client = new RestHighLevelClient(
RestClient.builder(
//集群节点
// new HttpHost("localhost", 9200, "http"),
new HttpHost("localhost", 9200, "http")));
this.client = client;
}
public void shutdown(){
if(client!=null){
try {
client.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 获取指定index和id的 数据
* @param index
* @param id
* @return
*/
public String getStringById(String index,String id){
String s = "";
id = "".equals(id)?"CW0sb2wBYtyF3syfPTY8":id;
index = "".equals(index)?"article-2019.08.08.03":index;
GetRequest getRequest = new GetRequest(index,id);
GetResponse response = null;
try {
response = this.client.get(getRequest, RequestOptions.DEFAULT);
} catch (IOException e) {
e.printStackTrace();
}
//按字段Key获取对应的值
//DocumentField field = response.getField("content");
//获取全部的map,除了正常的值之外，会存在key是@version和@timestamp的值
Map source = response.getSource();
s = (String) source.get("content");
return s;
}
/**
* 根据指定的内容，查询所有Doc。
* @param content
* @return
*/
public String searchArticle(String content){
String article = "";
//// QueryBuilder qb= QueryBuilders.boolQuery().must(QueryBuilders.termQuery("title","JAVA开发工程师")).must(QueryBuilders.termQuery("age",30)) ;
// //精确查询
//// QueryBuilder matchQueryBuilder = QueryBuilders.matchQuery("content", content);
// //模糊查询
// QueryBuilder matchQueryBuilder = QueryBuilders.matchPhraseQuery("content", content);
//// matchQueryBuilder.
// SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
//// sourceBuilder.query(QueryBuilders.termQuery("content", content));
// sourceBuilder.query(matchQueryBuilder);
// sourceBuilder.from(0);
// sourceBuilder.size(100);
// sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));
// SearchRequest searchRequest = new SearchRequest();
// searchRequest.indices("article-2019.08.08.03");
// searchRequest.source(sourceBuilder);
// SearchResponse searchResponse;
// List> list = new ArrayList<>();
//
// try {
// searchResponse = this.client.search(searchRequest,RequestOptions.DEFAULT);
// SearchHits searchHits = searchResponse.getHits();
// for(SearchHit hit:searchHits.getHits()){
// System.out.println( hit.getSourceAsString());
// list.add(hit.getSourceAsMap());
// }
// } catch (IOException e) {
// e.printStackTrace();
// }
SearchHits searchHits = search("article-2019.08.08.03","content",content);
List> list = new ArrayList<>();
for(SearchHit hit:searchHits.getHits()){
System.out.println( hit.getSourceAsString());
list.add(hit.getSourceAsMap());
}
article = list.toString();
return article;
}
public SearchHits search(String index,String key,String value){
QueryBuilder matchQueryBuilder = QueryBuilders.matchPhraseQuery(key, value);
// matchQueryBuilder.
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
// sourceBuilder.query(QueryBuilders.termQuery("content", content));
sourceBuilder.query(matchQueryBuilder);
sourceBuilder.from(0);
sourceBuilder.size(100);
sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));
SearchRequest searchRequest = new SearchRequest();
searchRequest.indices(index);
searchRequest.source(sourceBuilder);
SearchResponse searchResponse;
List> list = new ArrayList<>();
SearchHits searchHits = null;
try {
searchResponse = this.client.search(searchRequest,RequestOptions.DEFAULT);
searchHits = searchResponse.getHits();
for(SearchHit hit:searchHits.getHits()){
System.out.println( hit.getSourceAsString());
list.add(hit.getSourceAsMap());
}
} catch (IOException e) {
e.printStackTrace();
}
return searchHits;
}
public long deleteArticle(String titleName){
long deleteNum = 0l;
SearchHits searchHits = search("article-2019.08.08.03","title",titleName);
System.out.println("Exxcute Start" );
deleteCommon(searchHits);
//deleteAsync(searchHits);
System.out.println("Exxcute Done" );
return deleteNum;
}
/**
* 正常删除
* @param searchHits
*/
private void deleteCommon (SearchHits searchHits){
DeleteRequest deleteRequest = new DeleteRequest();
for(SearchHit hit:searchHits.getHits()) {
deleteRequest = new DeleteRequest("article-2019.08.08.03",hit.getId());
try {
DeleteResponse deleteResponse = this.client.delete(deleteRequest,RequestOptions.DEFAULT);
System.out.println("Delete Done【"+deleteResponse.getId()+"】,Status:【" + deleteResponse.status() + "】");
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 异步删除
* @param searchHits
*/
private void deleteAsync (SearchHits searchHits) {
DeleteRequest deleteRequest = new DeleteRequest();
for(SearchHit hit:searchHits.getHits()){
deleteRequest = new DeleteRequest("article-2019.08.08.03",hit.getId());
//异步删除
this.client.deleteAsync(deleteRequest, RequestOptions.DEFAULT, new ActionListener() {
@Override
public void onResponse(DeleteResponse deleteResponse) {
RestStatus restStatus = deleteResponse.status();
int status = restStatus.getStatus();
deleteResponse.getId();
System.out.println("Delete Done【"+deleteResponse.getId()+"】,Status:【" + status + "】");
}
@Override
public void onFailure(Exception e) {
e.printStackTrace();
System.out.println("ERROR " + hit.getId());
}
});
}
}
}
当然，这个API还包含了各种API操作，此处不做解释，请参考官网。
完毕。