java读取邮件excel附件的方法过程示例

<dependency>
  <groupId>com.sun.mail</groupId>
  <artifactId>jakarta.mail</artifactId>
  <version>{version}</version>
</dependency>

<dependency>
   <groupId>org.apache.poi</groupId>
   <artifactId>poi</artifactId>
   <version>{version}</version>
</dependency>
<dependency>
   <groupId>org.apache.poi</groupId>
   <artifactId>poi-ooxml</artifactId>
   <version>{version}</version>
</dependency>

//设置邮箱服务器地址、端口、用户
Properties props = new Properties();
props.setProperty("mail.imapStore.protocol","imap");
props.setProperty("mail.imap.host", "邮箱服务器host");
props.setProperty("mail.imap.port","邮箱服务端口");
// 是否启用ssl
if (useSsl.equals(1)) {
  MailSSLSocketFactory sf = new MailSSLSocketFactory();
  sf.setTrustAllHosts(true);
  props.put("mail.imap.ssl.enable", true);
  props.put("mail.imap.ssl.socketFactory", sf);
  props.put("mail.imap.ssl.protocols", "TLSv1.2");
}
Session session = Session.getInstance(props);
IMAPStore imapStore = (IMAPStore) session.getStore("imap");
// 输入邮箱及密码（授权码）
imapStore.connect("邮箱服务器host", "邮箱服务端口", "email地址","email密码(授权码)");
//打开收件箱
IMAPFolder imapFolder = (IMAPFolder) imapStore.getFolder("INBOX");
if (!imapFolder.isOpen()) {
   imapFolder.open(Folder.READ_ONLY);
}
//读取指定时间之后的邮件数据
SearchTerm searchTerm = new ReceivedDateTerm(ComparisonTerm.GT, new Date(时间戳));
// 取到文件夹中所有信息
Message[] messages = imapFolder.search(searchTerm);
// 循环处理读取到的邮件信息
for (Message message : messages) {
   // 读取附件
   readAttachment(message )   
}

public List<EmailAttachmentPojo> readAttachment(Part part) throws Exception {
        List<EmailAttachmentPojo> bodyParts = new LinkedList<>();
        if (part.isMimeType("multipart/*")) {
            Multipart multipart = (Multipart) part.getContent();    //复杂体邮件
            //复杂体邮件包含多个邮件体
            int partCount = multipart.getCount();
            for (int i = 0; i < partCount; i++) {
                // 获得复杂体邮件中其中一个邮件体
                BodyPart bodyPart = multipart.getBodyPart(i);
                // 某一个邮件体也有可能是由多个邮件体组成的复杂体
                String disposition = bodyPart.getDisposition();
                if (disposition != null && (disposition.equalsIgnoreCase(Part.ATTACHMENT) || disposition.equalsIgnoreCase(Part.INLINE))) {
                    bodyParts.add(EmailAttachmentPojo.builder()
                            .bodyPart(bodyPart)
                            .filename(decodeText(bodyPart.getFileName()))
                            .build());
                } else if (bodyPart.isMimeType("multipart/*")) {
                    bodyParts.addAll(readAttachment(bodyPart));
                } else {
                    String contentType = bodyPart.getContentType();
                    if (contentType.contains("name") || contentType.contains("application")) {
                        bodyParts.add(EmailAttachmentPojo.builder()
                                .bodyPart(bodyPart)
                                .filename(decodeText(bodyPart.getFileName()))
                                .build());
                    }
                }
            }
        } else if (part.isMimeType("message/rfc822")) {
            bodyParts.addAll(readAttachment((Part) part.getContent()));
        }
        return bodyParts;
}

// 1.获取工作簿
XSSFWorkbook workbook = new XSSFWorkbook("C:\\Users\\ghost\\Desktop\\hello.xlsx");
// 2.获取工作表
// xlsx第一个工作簿(Sheet1)，下标从0开始，0就是第一个
XSSFSheet sheet = workbook.getSheetAt(0);
// 开始索引(0) 结束索引
int lastRowNum = sheet.getLastRowNum(); //行的结束索引
for (int i = 0; i <= lastRowNum; i++) {
    // 拿到行
    XSSFRow row = sheet.getRow(i);
    if (row != null){
        short cellNum = row.getLastCellNum(); //单元格的结束索引
        for (int j = 0; j <= cellNum; j ++){
            XSSFCell cell = row.getCell(j);
            // 单元格不为空就去拿他的值
            if (cell != null){
                String stringCellValue = cell.getStringCellValue();
                System.out.println(stringCellValue);
            }
        }
    }
}
// 释放资源
workbook.close();