Lucene入门案例

Lucene入门案例 - 1

1. 引入相关jar包
   • commons-io-2.6.jar
   • lucene-analyzers-common-7.4.0.jar
   • lucene-core-7.4.0.jar
2. 创建class

public class LuceneFirst {
    @Test
    public void createIndex() throws Exception {
//        Directory directory = new RAMDirectory();
        Directory directory = FSDirectory.open(new File("E:\\Desktop\\Director").toPath());
        IndexWriter indexWriter = new IndexWriter(directory, new IndexWriterConfig());
        File dir = new File("E:\\Desktop\\learnway\\lucene\\02.参考资料\\searchsource");
        File[] files = dir.listFiles();
        for (File file : files) {
            String fileName = file.getName();
            String filePath = file.getPath();
            String fileContext = FileUtils.readFileToString(file, "UTF-8");
            long fileSize = FileUtils.sizeOf(file);
            Field fieldName = new TextField("name", fileName, Field.Store.YES);
            Field fieldPat = new TextField("path", filePath, Field.Store.YES);
            Field fieldContext = new TextField("context", fileContext, Field.Store.YES);
            Field fieldSize = new TextField("size", fileSize+"", Field.Store.YES);
            Document document = new Document();
            document.add(fieldContext);
            document.add(fieldName);
            document.add(fieldPat);
            document.add(fieldSize);
            indexWriter.addDocument(document);
        }
        indexWriter.close();
    }
}

3. 使用luke查看生成的index文档
   
   
   
   4.编写一个读取index文档的方法

@Test
    public void searchIndex()throws Exception {
        Directory directory = FSDirectory.open(new File("E:\\Desktop\\Director").toPath());
        IndexReader indexReader = DirectoryReader.open(directory);
        IndexSearcher indexSearcher = new IndexSearcher(indexReader);
        Query query = new TermQuery(new Term("context", "spring"));
        TopDocs topDocs = indexSearcher.search(query, 10);
        System.out.println("查询总记录数："+topDocs.totalHits);
        ScoreDoc[] scoreDocs = topDocs.scoreDocs;
        for (ScoreDoc scoreDoc : scoreDocs) {
            int docId = scoreDoc.doc;
            Document document = indexSearcher.doc(docId);
            System.out.println(document.get("name"));
            System.out.println(document.get("path"));
            System.out.println(document.get("size"));
//            System.out.println(document.get("context"));
            System.out.println("----------------");

        }

        indexReader.close();
    }