用java 写一个execl导入

非常感谢您的提问！以下是一个简单的 Java 代码示例，可以用于将 Excel 文件导入到数据库中：

import java.io.File;
import java.io.FileInputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Iterator;

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 ExcelImporter {
    public static void main(String[] args) {
        String jdbcUrl = "jdbc:mysql://localhost:3306/mydatabase";
        String username = "myusername";
        String password = "mypassword";
        String excelFilePath = "path/to/excel/file.xlsx";
        String tableName = "mytable";

        try (Connection connection = DriverManager.getConnection(jdbcUrl, username, password)) {
            FileInputStream inputStream = new FileInputStream(new File(excelFilePath));

            Workbook workbook = WorkbookFactory.create(inputStream);
            Sheet sheet = workbook.getSheetAt(0);
            Iterator<Row> rowIterator = sheet.iterator();

            String sql = "INSERT INTO " + tableName + " (column1, column2, column3) VALUES (?, ?, ?)";
            PreparedStatement statement = connection.prepareStatement(sql);

            int batchSize = 20;
            int count = 0;

            while (rowIterator.hasNext()) {
                Row row = rowIterator.next();

                Cell cell1 = row.getCell(0);
                Cell cell2 = row.getCell(1);
                Cell cell3 = row.getCell(2);

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

                statement.addBatch();

                if (++count % batchSize == 0) {
                    statement.executeBatch();
                }
            }

            statement.executeBatch();

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

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

请注意，这只是一个简单的示例，您需要根据您的具体需求进行修改和调整。同时，您需要确保您已经正确地安装了 MySQL 数据库和相关的 JDBC 驱动程序。