1.定义相关变量

private final static String filePath="E:\\workspace\\luceneDemo\\files";
private final static Path indexPath=Paths.get("E:\\workspace\\luceneDemo\\indexStore");
public static Analyzer analyzer = new SmartChineseAnalyzer();

filePath：需要创建索引的源文件地址

indexPath：索引保存地址

analyzer：定义分词器，这里采用lucene自带的中文分词器

2.建立索引

public static void createIndex(){
    List<Document> doc = File2DocumentUtil.files2Document(filePath);
    try {
        /*索引文件采用物理存储*/
        FSDirectory directory = FSDirectory.open(indexPath);
        /*索引文件内存存储*/
        //RAMDirectory directory1 = new RAMDirectory();
        //配置indexWriter，写入索引
        IndexWriterConfig config = new IndexWriterConfig(analyzer);
        IndexWriter indexWriter=new IndexWriter(directory, config);
        //创建之前删除所有索引
        indexWriter.deleteAll();
        //添加需要建立索引的Document
        indexWriter.addDocuments(doc);
        //提交写入
        indexWriter.commit();
        //关闭indexWriter
        indexWriter.close();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

3.文件转Document方法

public static List<Document> files2Document(String filePath) {
    File dir=new File(filePath);
    List<Document> list=new ArrayList<>();
    for(File file:dir.listFiles()){
        Document doc=new Document();
        doc.add(new TextField("name", file.getName(), Store.YES));
        doc.add(new StringField("path", file.getPath(), Store.YES));
        /*设置排序字段*/
        doc.add(new NumericDocValuesField("size",file.length()));  
        doc.add(new StringField("size", String.valueOf(file.length()), Store.YES));
        doc.add(new TextField("content", getFileContent(file), Store.YES));
        list.add(doc);
    }
    return list;
}

StringField：不会进行分词操作；

TextField：会进行分词操作。