java代码导出excel表格，然后excel表格发送给指定邮箱，java代码如何实现

要实现Java代码导出Excel表格并发送到指定邮箱，可以使用Apache POI库来操作Excel文件，以及JavaMail库来发送邮件。下面是一个简单的示例代码：

1. 导出Excel表格：

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

import java.io.FileOutputStream;
import java.io.IOException;

public class ExcelExporter {
    public static void exportToExcel() {
        // 创建工作簿
        Workbook workbook = new XSSFWorkbook();
        // 创建工作表
        Sheet sheet = workbook.createSheet("Sheet1");

        // 创建行和单元格，并填充数据
        Row row = sheet.createRow(0);
        Cell cell = row.createCell(0);
        cell.setCellValue("Hello");

        // 保存Excel文件
        try (FileOutputStream outputStream = new FileOutputStream("output.xlsx")) {
            workbook.write(outputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

2. 发送Excel表格到指定邮箱：

import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Properties;

public class EmailSender {
    public static void sendEmailWithAttachment(String recipient, String subject, String body, String attachmentPath) {
        // 邮件发送者的配置信息
        String senderEmail = "your_email@example.com";
        String senderPassword = "your_password";

        // 邮件服务器的配置信息
        String host = "smtp.example.com";
        int port = 587;

        // 创建邮件会话
        Properties props = new Properties();
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.host", host);
        props.put("mail.smtp.port", port);

        Session session = Session.getInstance(props, new Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(senderEmail, senderPassword);
            }
        });

        try {
            // 创建邮件消息
            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress(senderEmail));
            message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipient));
            message.setSubject(subject);

            // 添加邮件正文
            BodyPart messageBodyPart = new MimeBodyPart();
            messageBodyPart.setText(body);

            // 添加附件
            BodyPart attachmentBodyPart = new MimeBodyPart();
            attachmentBodyPart.attachFile(attachmentPath);

            // 组装邮件内容
            Multipart multipart = new MimeMultipart();
            multipart.addBodyPart(messageBodyPart);
            multipart.addBodyPart(attachmentBodyPart);

            message.setContent(multipart);

            // 发送邮件
            Transport.send(message);
        } catch (MessagingException | IOException e) {
            e.printStackTrace();
        }
    }
}

你可以根据需要调用这两个类中的方法来实现导出Excel表格并发送到指定邮箱。记得替换示例代码中的邮箱地址、密码、服务器信息等为你自己的配置。