To insert file data into a MySQL database using JDBC in Java, you can follow these steps:

1. Load the MySQL JDBC driver. You can do this by adding the MySQL JDBC driver to your project's classpath and then using the following code:

Class.forName("com.mysql.jdbc.Driver");

2. Create a connection to the MySQL database. You can create a connection to the MySQL database using the following code:

String url = "jdbc:mysql://localhost:3306/mydatabase";
String username = "myusername";
String password = "mypassword";

Connection connection = DriverManager.getConnection(url, username, password);

Replace "mydatabase", "myusername", and "mypassword" with your database name, username, and password.

3. Read the file data into a byte array. You can use a FileInputStream to read the contents of the file into a byte array. Here is an example of how to do this:

File file = new File("path/to/your/file");
byte[] fileData = new byte[(int) file.length()];
FileInputStream fis = new FileInputStream(file);
fis.read(fileData);
fis.close();

Replace "path/to/your/file" with the path to the file that you want to insert.

4. Create a PreparedStatement to insert the file data into the database. You can use a PreparedStatement to insert the file data into a BLOB (binary large object) column in the database. Here is an example of how to create a PreparedStatement:

PreparedStatement statement = connection.prepareStatement("INSERT INTO mytable (filename, filedata) VALUES (?, ?)");
statement.setString(1, file.getName());
statement.setBytes(2, fileData);
statement.executeUpdate();

Replace "mytable" with the name of your table.

5. Close the connection. Once you are finished using the connection, you should close it to free up system resources:

connection.close();

That's it! With these steps, you can insert file data into a MySQL database using JDBC in Java.