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我正在尝试使用 javax.mail 解析电子邮件。我想同时获取文本内容和所有附件(最好是内联图片/附件)。

我有以下代码,但它似乎与具有多个嵌套多部分的更复杂的邮件中断。

我已经阅读了常见问题解答并在谷歌上搜索了一整天,但没有找到解决方案。

请帮忙。

public static String fetchEmailcontent(Part message, String messageid) throws IOException, MessagingException {

        StringWriter sw = new StringWriter(1024);

        if (message != null && message.getContent() != null) {
            if (message.getContent() instanceof Multipart) {
                Multipart parts = (Multipart) message.getContent();
                BodyPart p;
                boolean alternative = parts.getContentType().trim().toLowerCase().startsWith("multipart/alternative") ? true : false;

                InputStreamReader isr;
                int retrieved;
                char[] buffer = new char[512];
                for (int i = 0; i < parts.getCount(); i++) {
                    p = parts.getBodyPart(i);

                    if (p.getContentType().toLowerCase().startsWith("multipart")) {
                        sw.write(fetchEmailcontent(p, messageid));
                        break;
                    } else if ((Part.INLINE.equalsIgnoreCase(p.getDisposition()) || p.getDisposition() == null) && p.getContentType().toLowerCase().startsWith("text") && p.getFileName() == null) {

                        if (InputStream.class.isInstance(p.getContent())) {
                            InputStream ip = p.getInputStream();

                            StringWriter subwriter = new StringWriter(ip.available());
                            isr = new InputStreamReader(ip);
                            while (isr.ready()) {
                                retrieved = isr.read(buffer, 0, 512);
                                subwriter.write(buffer, 0, retrieved);
                            }
                            sw.write(subwriter.toString());
                        } else {
                            Object content = p.getContent();
                            if (java.io.ByteArrayInputStream.class.isInstance(content)) {
                                int bcount = ((java.io.ByteArrayInputStream) content).available();
                                byte[] c = new byte[bcount];
                                ((java.io.ByteArrayInputStream) content).read(c, 0, bcount);
                                sw.write(new String(c));
                            } else {
                                sw.write(content.toString());
                            }
                        }
                        if (alternative && !"".equals(sw.toString().trim())) {
                            break;
                        }
                        sw.write("\r\n");
                    } else if (p.getDisposition() != null && (p.getDisposition().equalsIgnoreCase(Part.ATTACHMENT) || p.getDisposition().equalsIgnoreCase(Part.INLINE))) {
                        saveFile(MimeUtility.decodeText(p.getFileName()), p.getInputStream(), messageid);
                    }
                }
            } else if (message.getContentType().toLowerCase().startsWith("text")) {
                sw.write(message.getContent().toString());
            }
        }
        return sw.toString();
    }

这是无法从中获取附件的邮件示例:(我已删除标题和附件的 BASE64 代码以节省空间.. 否则它们很好)

Content-Type: multipart/mixed; boundary=f46d04016b4779522904c58fb5b4

--f46d04016b4779522904c58fb5b4
Content-Type: multipart/alternative; boundary=f46d04016b4779522104c58fb5b2

--f46d04016b4779522104c58fb5b2
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

test


sdljpjdpjsd


=E5=E4=F6

--f46d04016b4779522104c58fb5b2
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div>test </div><div>=A0</div><div>=A0</div><div>sdljpjdpjsd</div><div>=A0<=
/div><div>=A0</div><div>=E5=E4=F6</div>

--f46d04016b4779522104c58fb5b2--
--f46d04016b4779522904c58fb5b4
Content-Type: image/jpeg; name="blah.jpg"
Content-Disposition: attachment; filename="blah.jpg"
Content-Transfer-Encoding: base64
X-Attachment-Id: f_h50rhk180

BUNCH OF BASE64
--f46d04016b4779522904c58fb5b4
Content-Type: application/pdf; name="blah2.pdf"
Content-Disposition: attachment; filename="blah2.pdf"
Content-Transfer-Encoding: base64
X-Attachment-Id: f_h50ria042

BUNCH OF BASE64
--f46d04016b4779522904c58fb5b4--

预期的输出是消息正文中的文本以及保存到磁盘的所有附件。函数 saveFile() 可以做到这一点,但它太初级了,我决定不包括它。我确定这不是罪魁祸首。

提前致谢。

4

1 回答 1

0

在您的代码中...

if (InputStream.class.isInstance(p.getContent()))可以是假的,但是, InputStream ip = p.getInputStream();仍然可以成功!

希望这可以帮助。

于 2012-09-26T07:59:39.613 回答