游戏后端开发,网站如何做标题优化,企业网站蓝色模板下载,wordpress 如何修改主题宽度注意#xff01;#xff01;#xff01;博主只在测试环境试了一下#xff0c;没有发到生产环境跑。因为代码还没写完客户说不用弄了( •̩̩̩̩#xff3f;•̩̩̩̩ ) 也好#xff0c;少个功能少点BUG 使用from size的时候发现存在max_result_window10000的限制…注意博主只在测试环境试了一下没有发到生产环境跑。因为代码还没写完客户说不用弄了( •̩̩̩̩•̩̩̩̩ ) 也好少个功能少点BUG 使用from size的时候发现存在max_result_window10000的限制于是研究使用别的方法最终想出个歪招来实现深度分页跳页。 1、三种分页方式比较 2、实现过程
BaseEsMapper构建查询条件RestHighLevelClient实现scroll大分页滚动查询判断是否跨页如果跨页滚动拿到两页数据根据前端分页参数进行数据截取返回
3、实现代码
引入依赖
dependencygroupIdorg.dromara.easy-es/groupIdartifactIdeasy-es-boot-starter/artifactIdversion2.0.0/version
/dependency
dependencygroupIdorg.elasticsearch.client/groupIdartifactIdelasticsearch-rest-client/artifactIdversion7.6.2/version
/dependency
dependencygroupIdorg.elasticsearch.client/groupIdartifactIdelasticsearch-rest-high-level-client/artifactIdversion7.6.2/version
/dependencySearchResult
import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;
import lombok.Data;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;Data
public class SearchResultT implements Serializable {private int total;private ListDocBaseEntityT source new ArrayList();private JSONObject aggregations;private String scrollId;public void addData(DocBaseEntityT obj){source.add(obj);}public ListT getDatas(){return source.stream().map(DocBaseEntity::getDatas).collect(Collectors.toList());}public void addDatas(ListDocBaseEntityT objs){source.addAll(objs);}public void setTotal(Object total){this.total Integer.parseInt(String.valueOf(total));}public JSONObject toJSONObject(){return JSONUtil.parseObj(this,true);}
}DocBaseEntity
import cn.hutool.json.JSONObject;
import lombok.Data;
import org.elasticsearch.search.SearchHit;
import java.io.Serializable;Data
public class DocBaseEntityT implements Serializable {private String _index;private String _type;private String _id;private T datas;public DocBaseEntity(SearchHit data) {this._index data.getIndex();this._type data.getType();this._id data.getId();}public DocBaseEntity(JSONObject jsonHits){this._index jsonHits.getStr(_index);this._type jsonHits.getStr(_type);this._id jsonHits.getStr(_id);}public T getDatas(){return datas;}}RestClientConfig
import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;Configuration
public class RestClientConfig {Value(${elasticsearch.clientIps})private String clientIps;Value(${elasticsearch.httpPort})private int httpPort;Value(${elasticsearch.username})private String username;Value(${elasticsearch.password})private String password;private HttpHost[] getHttpHosts(String clientIps, int esHttpPort) {String[] clientIpList clientIps.split(,);HttpHost[] httpHosts new HttpHost[clientIpList.length];for (int i 0; i clientIpList.length; i) {httpHosts[i] new HttpHost(clientIpList[i], esHttpPort, http);}return httpHosts;}/*** 创建带HTTP Basic Auth认证rest客户端*/Beanpublic RestHighLevelClient restHighLevelClient() {CredentialsProvider credentialsProvider new BasicCredentialsProvider();credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(username, password));return new RestHighLevelClient(RestClient.builder(getHttpHosts(clientIps, httpPort)).setHttpClientConfigCallback((HttpAsyncClientBuilder httpAsyncClientBuilder) - httpAsyncClientBuilder.setDefaultCredentialsProvider(credentialsProvider)));}
}
滚动查询方法
Autowired
private RestHighLevelClient restHighLevelClient;/*** 滚动查询* param indexName* param pageNo* param pageSize* param scrollId* param resultObj* param wrapper* param T* return* throws IOException*/
public T SearchResultT scrollSearchElasticSearchDatas(String indexName,int pageNo,int pageSize,String scrollId,ClassT resultObj,LambdaEsQueryWrapperES实体类Bean wrapper) throws IOException {SearchSourceBuilder searchSourceBuilder rdsBookCommonDetailEsMapper.getSearchSourceBuilder(wrapper);searchSourceBuilder.size(pageSize);SearchRequest searchRequest new SearchRequest(indexName);searchRequest.source(searchSourceBuilder);//设定scroll失效时长Scroll scroll new Scroll(TimeValue.timeValueMinutes(3));searchRequest.scroll(scroll);SearchResponse searchResponse null;if(StrUtil.isEmpty(scrollId)){searchResponse executSearch(searchRequest);String tempscrollId searchResponse.getScrollId();SearchScrollRequest searchScrollRequest new SearchScrollRequest(tempscrollId);searchScrollRequest.scroll(scroll);for (int i 0; i (pageNo -1); i) {searchResponse scrollSearch(searchScrollRequest);}scrollId tempscrollId;}else {SearchScrollRequest searchScrollRequest new SearchScrollRequest(scrollId);searchResponse scrollSearch(searchScrollRequest);}//构建结果SearchResultT result createSearchResult(searchResponse,resultObj);result.setScrollId(scrollId);return result;
}/*** 执行查询*/
private SearchResponse executSearch(SearchRequest searchRequest) {SearchResponse searchResponse null;try{searchResponse restHighLevelClient.search(searchRequest,RequestOptions.DEFAULT);}catch(Exception e){//异常处理}return searchResponse;
}/*** 滚动查询执行* param searchScrollRequest* return*/
private SearchResponse scrollSearch(SearchScrollRequest searchScrollRequest){SearchResponse searchResponse null;try{searchResponse restHighLevelClient.scroll(searchScrollRequest,RequestOptions.DEFAULT);}catch(Exception e){//异常处理}return searchResponse;
}/*** 构建目标结果* param response 返回参数* param resultObj 类对象* param T* return*/
private T SearchResultT createSearchResult(SearchResponse response,ClassT resultObj){SearchResultT resultMap new SearchResult();SearchHit[] datas response.getHits().getHits();for(SearchHit data:datas){DocBaseEntityT temp new DocBaseEntity(data);temp.setDatas(JSONUtil.toBean(JSONUtil.parseObj(data.getSourceAsMap()),resultObj));resultMap.addData(temp);}resultMap.setTotal(response.getHits().getTotalHits().value);return resultMap;
}/*** 关闭scroll* param scrollId* throws IOException*/
private void clearScrollSession(String scrollId) throws IOException {if (scrollId ! null) {ClearScrollRequest clearScrollRequest new ClearScrollRequest();clearScrollRequest.addScrollId(scrollId);ClearScrollResponse clearScrollResponse restHighLevelClient.clearScroll(clearScrollRequest, RequestOptions.DEFAULT);clearScrollResponse.isSucceeded();}
}使用
LambdaEsQueryWrapperES实体类Bean wrapper new LambdaEsQueryWrapper();
wrapper.eqxxx
...构建各种查询条件
// 游标id
String scrollId ;
// 第一次查询
SearchResultES实体类Bean firstSearchResult null;
// 第二次查询
SearchResultES实体类Bean secondSearchResult null;
// 每次滚动查询5000条数据根据前端传的分页参数决定要滚动到哪一页
int maxPage ((searchCommonDetaiVo.getCurrentPage() * searchCommonDetaiVo.getPageSize()) / 5000) 1;
try {firstSearchResult scrollSearchElasticSearchDatas(IndexName, maxPage, 5000, scrollId, ES实体类Bean.class, wrapper);scrollId firstSearchResult.getScrollId();
} catch (IOException e) {e.printStackTrace();
}
// 判断是否跨页
if (searchCommonDetaiVo.getPageSize() (searchCommonDetaiVo.getCurrentPage() * searchCommonDetaiVo.getPageSize()) % 5000) {try {secondSearchResult scrollSearchElasticSearchDatas(IndexName, maxPage-1, 5000, scrollId, ES实体类Bean.class, wrapper);} catch (IOException e) {e.printStackTrace();}
}
// TODO 根据前端分页参数截取数据返回
try {clearScrollSession(scrollId);
} catch (IOException e) {log.info(游标清理失败);e.printStackTrace();
}
