Springboot整合全文检索引擎Lucene

Spring Boot整合Lucene创建索引和搜索的基本步骤如下：

1. 添加依赖到pom.xml：

<dependency>
    <groupId>org.apache.lucene</groupId>
    <artifactId>lucene-core</artifactId>
    <version>YOUR_LUCENE_VERSION</version>
</dependency>

2. 创建索引：

@Component
public class LuceneIndexer {
 
    private static final String INDEX_DIR = "path/to/index/dir";
 
    public void index(List<DocumentData> documents) throws IOException {
        Directory dir = FSDirectory.open(Paths.get(INDEX_DIR));
        IndexWriterConfig config = new IndexWriterConfig();
        IndexWriter writer = new IndexWriter(dir, config);
 
        for (DocumentData document : documents) {
            Document luceneDocument = new Document();
            luceneDocument.add(new StringField("id", document.getId(), Field.Store.YES));
            luceneDocument.add(new TextField("content", document.getContent(), Field.Store.YES));
            writer.addDocument(luceneDocument);
        }
 
        writer.close();
    }
}

3. 搜索索引：

@Component
public class LuceneSearcher {
 
    public List<SearchResult> search(String query) throws IOException {
        List<SearchResult> results = new ArrayList<>();
        Directory dir = FSDirectory.open(Paths.get(INDEX_DIR));
        IndexReader reader = DirectoryReader.open(dir);
        IndexSearcher searcher = new IndexSearcher(reader);
 
        QueryParser parser = new QueryParser("content", new StandardAnalyzer());
        Query luceneQuery = parser.parse(query);
 
        TopDocs topDocs = searcher.search(luceneQuery, 10);
        ScoreDoc[] scoreDocs = topDocs.scoreDocs;
 
        for (ScoreDoc scoreDoc : scoreDocs) {
            Document doc = searcher.doc(scoreDoc.doc);
            SearchResult result = new SearchResult();
            result.setId(doc.get("id"));
            result.setContent(doc.get("content"));
            results.add(result);
        }
 
        reader.close();
        return results;
    }
}

4. 使用Spring Boot的命令行运行器来创建和搜索索引：

@SpringBootApplication
public class LuceneApplication implements CommandLineRunner {
 
    @Autowired
    private LuceneIndexer indexer;
    @Autowired
    private LuceneSearcher searcher;
 
    public static void main(String[] args) {
        SpringApplication.run(LuceneApplication.class, args);
    }
 
    @Override
    public void run(String... args) throws Exception {