我正在mysql中的一个表上构建一个索引表（倒排文件）。它的工作方式是从一个文件中提取所有单词，并将它们存储到hashset中，然后将单词逐个插入到我的数据库表中。
它工作得很好，我知道倒排文件确实需要一些时间来建立索引表。我正在尝试优化表的索引时间，并考虑使用多线程。它会加速表演吗？
但是，我不太确定如何将它与我当前的程序集成，因为我是多线程新手。
代码：

public static void main(String[] args) throws Exception {

        StopWatch stopwatch = new StopWatch();
        stopwatch.start();

        File folder = new File("D:\\PDF1");
        File[] listOfFiles = folder.listFiles();

        for (File file : listOfFiles) {
            if (file.isFile()) {
                HashSet<String> uniqueWords = new HashSet<>();
                String path = "D:\\PDF1\\" + file.getName();
                try (PDDocument document = PDDocument.load(new File(path))) {

                    if (!document.isEncrypted()) {

                        PDFTextStripper tStripper = new PDFTextStripper();
                        String pdfFileInText = tStripper.getText(document);
                        String lines[] = pdfFileInText.split("\\r?\\n");
                        for (String line : lines) {
                            String[] words = line.split(" ");

                            for (String word : words) {
                                uniqueWords.add(word)
                                ;

                            }

                        }
                        // System.out.println(uniqueWords);

                    }
                } catch (IOException e) {
                    System.err.println("Exception while trying to read pdf document - " + e);
                }
                Object[] words = uniqueWords.toArray();

                MysqlAccessIndex connection = new MysqlAccessIndex();

                for(int i = 1 ; i <= words.length - 1 ; i++ ) {

                    connection.readDataBase(path, words[i].toString());

                }

                System.out.println("Completed");

            }
        }

mysql连接：

public class MysqlAccessIndex {
    public Connection connect = null;
    public Statement statement = null;
    public PreparedStatement preparedStatement = null;
    public ResultSet resultSet = null;

    public void connect() throws Exception {
        // This will load the MySQL driver, each DB has its own driver
        Class.forName("com.mysql.jdbc.Driver");
        // Setup the connection with the DB
        connect = DriverManager
                .getConnection("jdbc:mysql://126.32.3.20/fulltext_ltat?"
                        + "user=root&password=root");

        // Statements allow to issue SQL queries to the database
        statement = connect.createStatement();
        System.out.print("Connected");

    }
    public MysqlAccessIndex() throws Exception {

        connect();
    }

    public void readDataBase(String path,String word) throws Exception {
        try {

            // Result set get the result of the SQL query

            // This will load the MySQL driver, each DB has its own driver
            Class.forName("com.mysql.jdbc.Driver");
            // Setup the connection with the DB
            connect = DriverManager
                    .getConnection("jdbc:mysql://126.32.3.20/fulltext_ltat?"
                            + "user=root&password=root");

            // Statements allow to issue SQL queries to the database
            statement = connect.createStatement();
            System.out.print("Connected");
            // Result set get the result of the SQL query

            preparedStatement = connect
                    .prepareStatement("insert IGNORE into  fulltext_ltat.indextable values (default,?, ?) ");

            preparedStatement.setString(  1, path);
            preparedStatement.setString(2, word);
            preparedStatement.executeUpdate();
            // resultSet = statement
            //.executeQuery("select * from fulltext_ltat.index_detail");

            //  writeResultSet(resultSet);
        } catch (Exception e) {
            throw e;
        } finally {
            close();
        }

    }

如果有人指点我会很感激的。