写一个excel入库到mysql的java程序

以下是一个简单的Excel入库到MySQL的Java程序，使用Apache POI和JDBC连接数据库：

import java.io.FileInputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;

public class ExcelToMySQL {

    public static void main(String[] args) {
        String excelFilePath = "path/to/excel/file.xlsx";
        String url = "jdbc:mysql://localhost:3306/test";
        String username = "username";
        String password = "password";

        try (Connection conn = DriverManager.getConnection(url, username, password)) {
            String sql = "INSERT INTO table_name (column1, column2, column3) VALUES (?, ?, ?)";
            PreparedStatement statement = conn.prepareStatement(sql);

            FileInputStream inputStream = new FileInputStream(excelFilePath);
            Workbook workbook = WorkbookFactory.create(inputStream);
            Sheet sheet = workbook.getSheetAt(0);

            for (Row row : sheet) {
                Cell cell1 = row.getCell(0);
                Cell cell2 = row.getCell(1);
                Cell cell3 = row.getCell(2);

                statement.setString(1, cell1.getStringCellValue());
                statement.setDouble(2, cell2.getNumericCellValue());
                statement.setString(3, cell3.getStringCellValue());

                statement.executeUpdate();
            }

            workbook.close();
            inputStream.close();

            System.out.println("Data imported successfully!");
        } catch (SQLException | IOException e) {
            e.printStackTrace();
        }
    }
}

注意要替换程序中的excelFilePath、url、username、password、table_name和column1/2/3为实际值。程序只支持读取第一个sheet的前三列数据，可以根据需要进行修改。