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1.引入pom依赖
<!-- 邮箱 --> <dependency> <groupId>org.apache.commons</groupId> <artifactId>
commons-email</artifactId> <version>1.4</version> </dependency> <!-- easyexcel--
> <dependency> <groupId>cn.afterturn</groupId> <artifactId>easypoi-spring-boot-
starter</artifactId> <version>4.0.0</version> </dependency> <dependency> <
groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>4.1.2</
version> </dependency>
1.创建邮箱是实体类`
import lombok.Data; import java.util.List; /** * 创建邮箱实体类 * * @author ZL */
@Data public class CreateExcelSendEmailVo<T> { /** * 生成excel的数据 */ private List<
T>dataList; /** * excel的表头 */ private List<String> tableHeadList; /** * 邮件的标题 */
private String emailTitle; /** * 邮件内容 */ private String emailContent; /** *
邮件收件人邮箱，支持多个收件人邮箱 */ private List<String> acceptAddressList; }
2.工具类（这里是两个工具类，别看错了）
import com.alibaba.excel.metadata.BaseRowModel; import org.springframework.
stereotype.Component; /** * @author ZL */ @Component public class ExcelFactory<T
extends BaseRowModel> { public ExportExcelUtil<T> createExportExcel() { return
new ExportExcelUtil<>(); } } import com.alibaba.excel.ExcelWriter; import com.
alibaba.excel.metadata.BaseRowModel; import com.alibaba.excel.metadata.Sheet;
import com.alibaba.excel.metadata.Table; import com.alibaba.excel.support.
ExcelTypeEnum; import lombok.extern.slf4j.Slf4j; import org.springframework.
stereotype.Component; import java.io.ByteArrayOutputStream; import java.io.
IOException; import java.util.ArrayList; import java.util.List; /** *
Excel创建工具类 * * @author ZL */ @Component @Slf4j public class ExportExcelUtil<T
extends BaseRowModel> { public ExportExcelUtil() { } /** * 创建excel表 * * @param
out * @param data * @param tableHeadList * @throws IOException */ public void
createExcel(ByteArrayOutputStream out, List<T> data, List<String> tableHeadList)
throws IOException { try { List<List<String>> head = getExcelHead(tableHeadList)
; ExcelWriter writer = new ExcelWriter(null, out, ExcelTypeEnum.XLSX, true);
Table table = new Table(0); table.setHead(head); Sheet sheet1 = new Sheet(1, 0);
sheet1.setAutoWidth(true); sheet1.setSheetName("sheet1"); writer.write(data,
sheet1, table); writer.finish(); out.flush(); } finally { if (out != null) { out
.close(); } } } /** * 创建excel表头 * * @param tableHeadList * @return */ private
List<List<String>> getExcelHead(List<String> tableHeadList) { List<List<String>>
head= new ArrayList<List<String>>(); for (String s : tableHeadList) { List<
String> column = new ArrayList<String>(); column.add(s); head.add(column); }
return head; } }
3.创建邮箱业务类
import lombok.extern.slf4j.Slf4j; import org.springframework.beans.factory.
annotation.Value; import org.springframework.stereotype.Component; import javax.
activation.DataHandler; import javax.activation.DataSource; import javax.mail.*;
import javax.mail.internet.*; import javax.mail.util.ByteArrayDataSource; import
java.io.ByteArrayInputStream; import java.util.List; import java.util.Properties
; /** * 创建邮箱业务类 * * @author ZL */ @Component @Slf4j public class EmailService {
@Value("${email.userName:null}") private String userName; @Value(
"${email.passWord:null}") private String passWord; /** * 消息发送方法 * @param
acceptAddressList * @param title * @param text * @param affixName * @param
inputstream */ public void sendMsgFileDs(List<String> acceptAddressList, String
title, String text, String affixName, ByteArrayInputStream inputstream) {
Session session = assembleSession(); Message msg = new MimeMessage(session); try
{ msg.setFrom(new InternetAddress(userName)); msg.setSubject(title); Address[]
addressArr= acceptAddressList(acceptAddressList); msg.setRecipients(Message.
RecipientType.TO, addressArr); MimeBodyPart contentPart = (MimeBodyPart)
createContent(text, inputstream, affixName);//参数为正文内容和附件流 MimeMultipart mime =
new MimeMultipart("mixed"); mime.addBodyPart(contentPart); msg.setContent(mime);
Transport.send(msg); } catch (Exception e) { log.error("创建消息失败,{}",e); } } /**
* 创建邮件消息接收者 * * @param acceptAddressList * @return */ public Address[]
acceptAddressList(List<String> acceptAddressList) { Address[] tos = new
InternetAddress[acceptAddressList.size()]; try { for (int i = 0; i <
acceptAddressList.size(); i++) { tos[i] = new InternetAddress(acceptAddressList.
get(i)); } } catch (AddressException e) { log.error("创建邮件消息接收者失败,{}",e); }
return tos; } /** * 以QQ邮箱为例，邮箱配置类 * * @return */ public Session assembleSession(
) { String host = "host"; String mailStoreType = "smtp"; String popPort = "587";
final Properties props = new Properties(); props.put("mail.smtp.auth", "true");
props.put("mail.smtp.host", host); props.put("mail.store.protocol",
mailStoreType); props.put("mail.smtp.port", popPort); //开启SSL props.put(
"mail.smtp.starttls.enable", "true"); props.put("mail.smtp.socketFactory.port",
popPort); props.put("mail.smtp.socketFactory.fallback", "false"); Session
session= Session.getDefaultInstance(props, new MyAuthenricator(userName,
passWord)); return session; } /** * 输出的excel文件配置 * * @param content * @param
inputstream * @param affixName * @return */ static Part createContent(String
content, ByteArrayInputStream inputstream, String affixName) { MimeBodyPart
contentPart= null; try { contentPart = new MimeBodyPart(); MimeMultipart
contentMultipart= new MimeMultipart("related"); MimeBodyPart htmlPart = new
MimeBodyPart(); htmlPart.setContent(content, "text/html;charset=gbk");
contentMultipart.addBodyPart(htmlPart); //附件部分 MimeBodyPart excelBodyPart = new
MimeBodyPart(); DataSource dataSource = new ByteArrayDataSource(inputstream,
"application/excel"); DataHandler dataHandler = new DataHandler(dataSource);
excelBodyPart.setDataHandler(dataHandler); excelBodyPart.setFileName(MimeUtility
.encodeText(affixName)); contentMultipart.addBodyPart(excelBodyPart);
contentPart.setContent(contentMultipart); } catch (Exception e) { e.
printStackTrace(); } return contentPart; } /** *
用户名密码验证，需要实现抽象类Authenticator的抽象方法PasswordAuthentication *
注意：这里的用户密码不是邮箱登录密码，而是授权码 */ static class MyAuthenricator extends Authenticator {
String u = null; String p = null; public MyAuthenricator(String u, String p) {
this.u = u; this.p = p; } @Override protected PasswordAuthentication
getPasswordAuthentication() { return new PasswordAuthentication(u, p); } } }
4.邮件发送工具类
import com.alibaba.excel.metadata.BaseRowModel; import lombok.extern.slf4j.
Slf4j; import org.springframework.beans.factory.annotation.Autowired; import org
.springframework.stereotype.Component; import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream; import java.util.List; import java.util.
Random; /** * 邮件发送工具类 * * @author ZL */ @Component @Slf4j public class EmailUtil
<T extends BaseRowModel> { @Autowired private ExcelFactory excelFactory;
@Autowired private EmailService emailService; /** * @Author ZL * @Describetion
发送邮件的入口方法 */ public void sendEmail(CreateExcelSendEmailVo vo) { try { log.info(
"开始发送邮件: {}", vo); generateExcelSendEmail(vo.getDataList(), vo.getTableHeadList(
), vo.getAcceptAddressList(), vo.getEmailTitle(), vo.getEmailContent()); log.
info("发送邮件成功"); } catch (Exception e) { log.info("发送邮件失败", e); } } /** *
@Author ZL * @Describetion 生成excel并发送邮件 */ public void generateExcelSendEmail(
List<T> dataList, List<String> tableHeadList, List<String> acceptAddressList,
String emailTitle, String content) { try { ByteArrayOutputStream out = new
ByteArrayOutputStream(); String fileName = "email_" + new Random().nextInt(10000
) + System.currentTimeMillis() + ".xlsx"; //生成excel excelFactory.
createExportExcel().createExcel(out, dataList, tableHeadList); // 发送邮件
emailService.sendMsgFileDs(acceptAddressList, emailTitle, content, fileName, new
ByteArrayInputStream(out.toByteArray())); } catch (Exception e) { log.error(
"发送邮件时出错：{}", e); } } }
4.测试（以上代码可直接使用）
/** * 测试 */ @Test public void test() { CreateExcelSendEmailVo vo = new
CreateExcelSendEmailVo<>(); // 1.构建导出数据内容，这里我是查询自己的用户表 List<Usre> usreList =
userService.getUserList; vo.setDataList(usreList); // 2.设置表头 List<String>
headList= new ArrayList<>(); headList.add("姓名"); headList.add("年龄"); vo.
setTableHeadList(headList); // 3.设置email的title vo.setEmailTitle("测试");
//4.设置email的内容 vo.setEmailContent("学生表"); // 5.设置收件人 List<String>
acceptAddressList= new ArrayList<>(); acceptAddressList.add("[email protected]"); vo.
setAcceptAddressList(acceptAddressList); // 6.发送邮件 emailUtil.sendEmail(vo); }