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First, demand analysis shows
There is a news and information in the database table, now we need to create an index file to this table data to support fast full-text search capabilities.
As shown below in Table
Second, creating a LuceneUtil, Lucene encapsulates objects corresponding to index the operation.
package com.springboot.main.eimm.search.util;
import java.io.File;
import org.apache.lucene.analysis.Analyzer;
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.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;
import org.wltea.analyzer.lucene.IKAnalyzer;
/**
*
* @method Lucene索引操作对象工具类
* @author Mr yi
* @time 2019年5月23日
*/
public class LuceneUtils {
private static Directory directory = null;
private static IndexWriterConfig indexWriterConfig = null;
private static Analyzer analyzer = null;
private static Version matchVersion = null;
//static 代码块随着类的加载，只加载一次。作用是初始化类。
static{
try {
//在 6.6 以上版本中 version 不再是必要的，并且，存在无参构造方法，可以直接使用默认的 StandardAnalyzer 分词器。
matchVersion = Version.LUCENE_8_1_0;
//索引存放的位置，设置在当前目录中（项目根路径下）
final String INDEXURL = "./index_dir/search";
directory = FSDirectory.open(new File(INDEXURL).toPath());
//analyzer = new StandardAnalyzer(); // 标准分词器，适用于英文[支持中文采用的方法为单字切分。他会将词汇单元转换成小写形式，并去除停用词和标点符号]
//analyzer = new SmartChineseAnalyzer();//中文分词
//analyzer = new ComplexAnalyzer();//中文分词
//analyzer = new IKAnalyzer();//中文分词
analyzer = new IKAnalyzer();//中文分词
} catch (Exception e) {
e.printStackTrace();
}
}
public static Directory getDirectory() {
return directory;
}
/**
*
* @method 返回用于操作索引的对象
* @author Mr yi
* @time 2019年5月23日
* @return
* @throws Exception
*/
public static IndexWriter getIndexWriter() throws Exception{
//创建索引写入配置
indexWriterConfig = new IndexWriterConfig(analyzer);
//创建索引写入对象
IndexWriter indexWriter = new IndexWriter(directory, indexWriterConfig);
return indexWriter;
}
/**
*
* @method 返回用于读取索引的对象
* @author Mr yi
* @time 2019年5月23日
* @return
* @throws Exception
*/
public static IndexSearcher getIndexSearcher() throws Exception{
IndexReader indexReader = DirectoryReader.open(directory);
IndexSearcher indexSearcher = new IndexSearcher(indexReader);
return indexSearcher;
}
/**
*
* @method 返回当前版本
* @author Mr yi
* @time 2019年5月23日
* @return
*/
public static Version getMatchVersion() {
return matchVersion;
}
/**
*
* @method 返回当前使用的分词器
* @author Mr yi
* @time 2019年5月23日
* @return
*/
public static Analyzer getAnalyzer() {
return analyzer;
}
}
Third, create SearchUtils, a package indexing operation method
/**
*
* @method 将Article数据转换为Document
* @author Mr yi
* @time 2019年5月23日
* @param article 对象
* @return
*/
public static Document articleToDocument(Article article ){
if(article==null)
return null;
Document document = new Document();
IndexableField idField = new StringField("id",article.getId(),Store.YES);
IndexableField titleField = new StringField("artitle_title",article.getArtitle_title(),Store.YES);
IndexableField contentField = new TextField("artitle_content",article.getArtitle_content(),Store.YES);
IndexableField urlField = new StringField("artitle_url",article.getArtitle_url(),Store.YES);
IndexableField authorField = new StringField("artitle_author",article.getArtitle_author(),Store.YES);
IndexableField stateField = new StringField("artitle_state",article.getArtitle_state(),Store.YES);
IndexableField typeField = new StringField("artitle_type",article.getArtitle_type(),Store.YES);
document.add(idField);
document.add(titleField);
document.add(contentField);
document.add(urlField);
document.add(authorField);
document.add(stateField);
document.add(typeField);
return document;
}
/**
*
* @method 添加索引
* @author Mr yi
* @time 2019年5月24日
* @param document
* @throws Exception
*/
public static void addIndex(Document document) throws Exception{
//获取indexWrite对象
IndexWriter indexWriter = LuceneUtils.getIndexWriter();
try {
//将document写入磁盘中
indexWriter.addDocument(document);
}finally {//定要注意关闭indexWrite. 包括异常下,用finally关闭.否则会导致下一次写索引失败.，修改程序后，直接删除write.lock文件后就可以
indexWriter.close();
}
}
Fourth, creating class instances SearchServiceImpl service, includes creating an index operation, DAO layer does not provide specific implementation
/**
* 添加索引
* @param article
* @throws Exception
*/
@Override
public void addIndex() throws Exception{
IndexWriter indexWriter = LuceneUtils.getIndexWriter();
Artitle artitle = new Artitle (); //这里需要给artitle 对象赋值
Document document = SearchUtils.articleToDocument(artitle);
SearchUtils.addIndex(document);
}
Fifth, and finally call control layer addIndex () method, or you can write the test class, find the index file will be found under index_dir folder under the root directory of the project after the success.
