免费做网站方法电商培训班一般多少钱

简介

1. 数据每分钟产生200条，使用mysql储存。
2. 目前有数据超过700M。
3. 按照日期查询，按月查询包含每次超过20w条以上，时间比较长。
4. 计划使用lucene优化查询，不适用es是因为项目较小，没有更富裕的资源。

基本步骤

1. 引入依赖。
2. 开发工具类。
3. 开发索引功能，完成索引。
4. 开发定时任务，完成数据增量更新。
5. 开发搜索功能，可以搜索数据。

引入依赖

1. 修改pom文件

<!-- Lucence核心包 -->
<dependency><groupId>org.apache.lucene</groupId><artifactId>lucene-core</artifactId><version>9.7.0</version>
</dependency><!-- Lucene查询解析包 -->
<dependency><groupId>org.apache.lucene</groupId><artifactId>lucene-queryparser</artifactId><version>9.7.0</version>
</dependency>

• 注：没有使用更多的包是因为这次优化是以long类型区间计算为主，不需要全文索引，所以有基础的包就够了。

工具类

1. 实现基本的生成、删除和查询。

import com.xxx.common.ResponseCode;
import com.xxx.common.exception.SystemException;
import com.xxx.common.util.ValidUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;import java.io.File;
import java.io.IOException;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;@Component
@Slf4j
public class LuceneUtil {//索引文件存放路径@Value("${lucene.index.path}")private String luceneIndexPath;/**生成索引方法*/public <T> void createIndex(List<T> list, CreateDocumentHandler handler) {File file = new File(luceneIndexPath);if (!file.exists()) {file.mkdir();}if (ValidUtil.isEmpty(list)) {return;}long startTime = System.currentTimeMillis();IndexWriter writer = null;try {Directory dir = FSDirectory.open(Paths.get(luceneIndexPath));//标准分词器，会自动去掉空格啊，is a the等单词Analyzer analyzer = new StandardAnalyzer();//将标准分词器配到写索引的配置中IndexWriterConfig config = new IndexWriterConfig(analyzer);//实例化写索引对象writer = new IndexWriter(dir, config);for (T t : list) {Document doc = handler.createDocument(t);writer.addDocument(doc);}writer.commit();} catch (Exception e) {throw new SystemException(ResponseCode.ERROR, e);} finally {try {if (null != writer) {writer.close();}} catch (Exception e) {throw new SystemException(ResponseCode.ERROR, e);}}//记录索引结束时间long endTime = System.currentTimeMillis();log.info("建立索引耗时" + (endTime - startTime) + "毫秒");}/**清楚所有索引*/public void clean() {File file = new File(luceneIndexPath);if (!file.exists()) {return;}long startTime = System.currentTimeMillis();IndexWriter writer = null;try {Directory dir = FSDirectory.open(Paths.get(luceneIndexPath));//标准分词器，会自动去掉空格啊，is a the等单词Analyzer analyzer = new StandardAnalyzer();//将标准分词器配到写索引的配置中IndexWriterConfig config = new IndexWriterConfig(analyzer);//实例化写索引对象writer = new IndexWriter(dir, config);writer.deleteAll();} catch (Exception e) {throw new SystemException(ResponseCode.ERROR, e);} finally {try {if (null != writer) {writer.close();}} catch (Exception e) {throw new SystemException(ResponseCode.ERROR, e);}}//记录索引结束时间long endTime = System.currentTimeMillis();log.info("清除索引耗时" + (endTime - startTime) + "毫秒");}/**查询*/public List<Document> search(CreateQueryParamsHandler handler) {File file = new File(luceneIndexPath + File.separator + "write.lock");if (!file.exists()) {return new ArrayList<>();}IndexReader reader = null;try {//获取要查询的路径，也就是索引所在的位置Directory dir = FSDirectory.open(Paths.get(luceneIndexPath));reader = DirectoryReader.open(dir);if (reader == null) {return new ArrayList<>();}//构建IndexSearcherIndexSearcher searcher = new IndexSearcher(reader);//记录索引开始时间long startTime = System.currentTimeMillis();//开始查询，查询前10条数据，将记录保存在docs中TopDocs docs = handler.handler(searcher);//记录索引结束时间long endTime = System.currentTimeMillis();log.info("索引查询耗时" + (endTime - startTime) + "毫秒");List<Document> result = new ArrayList<>(Long.valueOf(docs.totalHits.value).intValue());//取出每条查询结果for(ScoreDoc scoreDoc : docs.scoreDocs) {Document doc = searcher.doc(scoreDoc.doc);result.add(doc);}return result;} catch (Exception e) {throw new SystemException(ResponseCode.ERROR, e);} finally {try {assert reader != null;reader.close();} catch (IOException e) {throw new SystemException(ResponseCode.ERROR, e);}}}
}

生成索引功能

public void index(Date startDate) {log.info("start index! Date : " + DateUtil.format(DateUtil.now()));Date curStartDate = startDate;while (true) {Date curEndDate = DateUtil.datePlusDays(curStartDate, 1);List<CurrencyData> list = currencyDataMapper.queryLuceneList(CurrencyDataForm.builder().createTimeBegin(curStartDate.getTime()).createTimeEnd(curEndDate.getTime()).build());log.info(String.format("index startDate = %s, endDate = %s, size = %s", DateUtil.format(curStartDate), DateUtil.format(curEndDate), list.size()));if (list.size() == 0) {CurrencyDataForm countForm = CurrencyDataForm.builder().createTimeBegin(curStartDate.getTime()).build();List<CurrencyData> one = currencyDataMapper.getOne(countForm);log.info("has more begin:" + DateUtil.format(curEndDate) + ", result: " + (one.size() > 0 ? "yes" : "no"));if (one.size() == 0) {break;}}luceneUtil.createIndex(list, (CreateDocumentHandler<Data>) data -> {Document doc = new Document();//开始添加字段doc.add(new TextField("dId", data.getDId(), Field.Store.YES));doc.add(new TextField("typeId", data.getTypeId(), Field.Store.YES));//区间查询需要doc.add(new LongPoint("createTime", data.getCreateTime()));//储存需要doc.add(new StoredField("createTime", data.getCreateTime()));// 排序需要doc.add(new NumericDocValuesField("sortTime", data.getCreateTime()));// 第二个参数需要处理非空的情况doc.add(new TextField("value", (ValidUtil.isEmpty(data.getValue()) ? "" : data.getValue()) , Field.Store.YES));doc.add(new TextField("unit", (ValidUtil.isEmpty(data.getUnit()) ? "" : data.getUnit()) , Field.Store.YES));return doc;});curStartDate = curEndDate;}log.info("finish index!");
}

• 注：每次生成1天的索引，如果本轮没数据，并且大于结束时间也没数据，结束索引。

定时任务

private ThreadPoolTaskExecutor tpe;tpe.execute(() -> {Date startDate = null;try {startDate = getLastDate();} catch (SystemException s) {luceneUtil.clean();startDate = DateUtil.parse(initStartTime);}try {index(startDate);} catch (Exception e) {log.info("生成索引异常。", e);} finally {ScheduledExecutorService executor = Executors.newScheduledThreadPool(1);executor.schedule(this::init, 60, TimeUnit.SECONDS);executor.shutdown();}
});

• 注：使用线程池+延时任务，实现每60s执行一次功能。

搜索

public List<Data> queryIndex(Form form) {List<Data> result = new ArrayList<>();List<Document> documentList = luceneUtil.search((searcher) -> {BooleanQuery.Builder builder = new BooleanQuery.Builder();if (ValidUtil.isNotEmpty(form.getDId())) {TermQuery deviceIdQuery = new TermQuery(new Term("dId", form.getDId()));builder.add(deviceIdQuery, BooleanClause.Occur.MUST);}if (ValidUtil.isNotEmpty(form.getTypeId())) {TermQuery typeQuery = new TermQuery(new Term("typeId", form.getTypeId()));builder.add(deviceIdQuery, BooleanClause.Occur.MUST);}if (ValidUtil.isNotEmpty(form.getBegin()) && ValidUtil.isNotEmpty(form.getEnd())) {Query timeQuery = LongPoint.newRangeQuery("time", form.getBegin().getTime(), form.getEnd().getTime());builder.add(timeQuery, BooleanClause.Occur.MUST);}Sort sort = new Sort(new SortField("sortTime", SortField.Type.LONG, false));// 执行查询return searcher.search(builder.build(), form.getSize(), sort);});for (Document document : documentList) {Data data = new Data();data.setTypeId(Integer.valueOf(document.get("typeId")));data.setDId(Integer.valueOf(document.get("dId")));data.setTime(document.getField("time").numericValue().longValue());data.setValue(document.get("value"));data.setUnit(document.get("unit"));result.add(data);}return result;
}