Javaを使用してフォームデータのインポートおよびエクスポート機能を開発する

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.File;
import java.io.FileInputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;

public class FormImportExample {
    public static void main(String[] args) {
        try {
            // 连接数据库
            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/myDB", "username", "password");

            // 打开Excel文件
            FileInputStream file = new FileInputStream(new File("data.xlsx"));
            
            // 创建工作簿
            Workbook workbook = new XSSFWorkbook(file);

            // 获取第一个工作表
            Sheet sheet = workbook.getSheetAt(0);

            // 遍历每一行
            for (Row row : sheet) {
                // 读取每一列的数据
                String col1 = row.getCell(0).getStringCellValue();
                int col2 = (int) row.getCell(1).getNumericCellValue();
                String col3 = row.getCell(2).getStringCellValue();
                
                // 将数据存储到数据库
                String sql = "INSERT INTO myTable (col1, col2, col3) VALUES (?, ?, ?)";
                PreparedStatement stmt = conn.prepareStatement(sql);
                stmt.setString(1, col1);
                stmt.setInt(2, col2);
                stmt.setString(3, col3);
                stmt.executeUpdate();
                stmt.close();
            }

            // 关闭文件和数据库连接
            file.close();
            conn.close();
            
            System.out.println("数据导入成功！");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.FileOutputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class FormExportExample {
    public static void main(String[] args) {
        try {
            // 连接数据库
            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/myDB", "username", "password");

            // 获取数据
            Statement stmt = conn.createStatement();
            ResultSet rs = stmt.executeQuery("SELECT * FROM myTable");

            // 创建工作簿
            Workbook workbook = new XSSFWorkbook();
            Sheet sheet = workbook.createSheet("Data");

            // 创建表头
            Row header = sheet.createRow(0);
            header.createCell(0).setCellValue("Col1");
            header.createCell(1).setCellValue("Col2");
            header.createCell(2).setCellValue("Col3");

            // 填充数据
            int rowIndex = 1;
            while (rs.next()) {
                Row row = sheet.createRow(rowIndex++);
                row.createCell(0).setCellValue(rs.getString("col1"));
                row.createCell(1).setCellValue(rs.getInt("col2"));
                row.createCell(2).setCellValue(rs.getString("col3"));
            }

            // 导出文件
            FileOutputStream file = new FileOutputStream("exported_data.xlsx");
            workbook.write(file);
            
            // 关闭文件和数据库连接
            file.close();
            stmt.close();
            conn.close();
            
            System.out.println("数据导出成功！");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}