Java以邮件附件的方式发送excel文件

思路：Java创建Excel,返回一个ByteArrayOutputStream 流   ==>   sendEmail()接受ByteArrayOutputStream 流以附件的形式发送出去

创建Excel表格：

public class CreatExcel {
	public static ByteArrayOutputStream creatExcel(String[] title, JSONArray all) {
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		//创建一个表格
		Workbook workbook = new XSSFWorkbook();
		// 创建一个工作薄对象
		XSSFSheet sheet = (XSSFSheet) workbook.createSheet("sheet1");
		//设置首行
		XSSFRow row0 = sheet.createRow(0);
		for(int i=0;i

Java 邮件发送附件：

public class SendEmail {
	public static boolean sendEmail(String to,ByteArrayOutputStream baos) {
        // 发件人电子邮箱
        String from = "*****@qq.com";
        // 获取系统属性
        Properties properties = System.getProperties();
        // 设置邮件服务器 ->QQ 邮件服务器
        properties.setProperty("mail.smtp.host", "smtp.qq.com");
        properties.put("mail.smtp.auth", "true");
        // 获取默认session对象
        Session session = Session.getDefaultInstance(properties,new Authenticator(){
          public PasswordAuthentication getPasswordAuthentication()
          {
           return new PasswordAuthentication("*******@qq.com", "******"); //发件人邮件用户名、授权码
          }
         });
   
        try{
           // 创建默认的 MimeMessage 对象
           MimeMessage message = new MimeMessage(session);
           // Set From: 头部头字段
           message.setFrom(new InternetAddress(from));
           // Set To: 头部头字段
           message.addRecipient(Message.RecipientType.TO,new InternetAddress(to));
           // Set Subject: 头部头字段
           message.setSubject("This is the Subject Line!");
           /*添加附件*/
           Multipart multipart = new MimeMultipart();   
           if(baos != null) {
               MimeBodyPart fileBody = new MimeBodyPart();
               DataSource source = new ByteArrayDataSource(baos.toByteArray(), "application/msexcel");
               fileBody.setDataHandler(new DataHandler(source));
               // 中文乱码问题
               fileBody.setFileName(MimeUtility.encodeText("ww.xlsx"));
               multipart.addBodyPart(fileBody);
           }
           message.setContent(multipart);
           // 发送消息
           Transport.send(message);
           System.out.println("Sent message successfully....from runoob.com");
        }catch (MessagingException mex) {
           mex.printStackTrace();
        } catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return false;
	}
	public static void main(String[] args) {
		JSONArray all = new JSONArray();
		String[] title = {"哈哈","hahahah"};
		ByteArrayOutputStream  baos = CreatExcel.creatExcel(title, all);
		SendEmail.sendEmail("******@qq.com",baos);
	}
}