如何使用JavaMail從電子郵件正文獲取圖像

Question

我需要從閱讀時電子郵件正文中包含的圖像中獲取cid：的值，以能夠將cid：的值替換為圖像的base64，但是我無法獲取此值，有人有什么建議嗎？

            try {
       MimeMultipart multipart = (MimeMultipart) msg.getDataHandler().getContent();
       int temp = 0, temp2 = 0;
       for (int k = 0; k < multipart.getCount(); k++) {
          MimeBodyPart bodyPart = (MimeBodyPart) multipart.getBodyPart(k);
          String splited[] = new String[15];
          splited = bodyPart.getContentType().split(" ");

          if (!splited[0].equals("text/plain;") && !splited[0].equals("text/html;")) {
             MimeBodyPart part = bodyPart;
             MimeMultipart p = (MimeMultipart) part.getDataHandler().getContent();
             int count = 0;
             for (int i = 0; i < p.getCount(); i++) {
                String mimeSplited[] = new String[15];
                ByteArrayOutputStream bos = new ByteArrayOutputStream();
                Base64 decoder64 = new Base64();
                StringBuilder s = new StringBuilder(eMail.getCorpoEmail());

                System.out.println("CID NAME" + i + " :" + p.getBodyPart(i).getFileName());
                System.out.println("CID TYPE" + i + " :" + p.getBodyPart(i).getContentType());

                if (i != p.getCount() - 1) {
                   p.getBodyPart(i + 1).getDataHandler().writeTo(bos);
                   mimeSplited = p.getBodyPart(i + 1).getContentType().split(" ");
                   s.insert(s.indexOf(":part" + (i + 1)) - 3, "data:" + mimeSplited[0] + " base64," + decoder64.encodeToString(bos.toByteArray()));
                } else {
                   p.getBodyPart(i).getDataHandler().writeTo(bos);
                   mimeSplited = p.getBodyPart(i).getContentType().split(" ");
                   s.insert(s.indexOf(":part" + i) - 3, "data:" + mimeSplited[0] + " base64," + decoder64.encodeToString(bos.toByteArray()));

                }
                eMail.setCorpoEmail(s.toString());
             }
          } else {
          }

到目前為止，這是我的代碼。

我的新代碼：

            try {
           MimeMultipart multipart = (MimeMultipart) msg.getDataHandler().getContent();
           int temp = 0, temp2 = 0;
           System.out.println("EMAIL BODY ->\n"+eMail.getCorpoEmail());
           for (int k = 0; k < multipart.getCount(); k++) {
              MimeBodyPart bodyPart = (MimeBodyPart) multipart.getBodyPart(k);
              String splited[] = new String[15];
              splited = bodyPart.getContentType().split(" ");

              ByteArrayOutputStream bos = new ByteArrayOutputStream();
              String mimeSplited[] = new String[15];
              Base64 decoder64 = new Base64();
              StringBuilder s = new StringBuilder(eMail.getCorpoEmail());
              String editedBody = "";
              int tempPosition = 0;
              if (bodyPart.getContentType().contains("image/")) {
                 MimeBodyPart part = bodyPart;
                 MimeMultipart p = (MimeMultipart) part.getDataHandler().getContent();

                 //THAT FUNCTION RETURNS NULL EVERY TIME
                 System.out.println("ID -> "+part.getContentID());

                 for (int i = 0; i < p.getCount(); i++) {
                    if (i != p.getCount() - 1) {
                       p.getBodyPart(i + 1).getDataHandler().writeTo(bos);
                       mimeSplited = p.getBodyPart(i + 1).getContentType().split(" ");

                       if (mimeSplited[0].equals("text/html;") || mimeSplited[0].equals("text/plain;")) {
                          s.insert(s.indexOf("src=") + 5, "data:" + "image/png;" + " base64," + decoder64.encodeToString(bos.toByteArray()));

                       } else {
                          s.insert(s.indexOf("src=") + 5, "data:" + mimeSplited[0] + " base64," + decoder64.encodeToString(bos.toByteArray()));

                       }
                       tempPosition = (s.indexOf("src=") + 5) + 23 + decoder64.encodeToString(bos.toByteArray()).length();
                       editedBody = editedBody.concat(s.substring(0, tempPosition));
                       s.delete(0, tempPosition);

                    } else {
                       p.getBodyPart(i).getDataHandler().writeTo(bos);
                       mimeSplited = p.getBodyPart(i).getContentType().split(" ");
//                       s.insert(s.indexOf("src=") + 5, "data:" + mimeSplited[0] + " base64," + decoder64.encodeToString(bos.toByteArray()));
                       tempPosition = (s.indexOf("src=") + 5) + 23 + decoder64.encodeToString(bos.toByteArray()).length();
                       editedBody = editedBody.concat(s.toString());
                    }
                    eMail.setCorpoEmail(editedBody);
                    bos.reset();
                 }
              } else {
              }
           }
        } catch (Exception e) {
           System.out.println("error: " + e);
        }

電子郵件內文

 <html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <meta name=Generator content="Microsoft Word 14 (filtered medium)"> <!--[if !mso]><style>v\\:* {behavior:url(#default#VML);} o\\:* {behavior:url(#default#VML);} w\\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} </style><![endif]--> <style> <!-- /* Font Definitions */ @font-face { font-family: Calibri; panose-1: 2 15 5 2 2 2 4 3 2 4; } @font-face { font-family: Tahoma; panose-1: 2 11 6 4 3 5 4 4 2 4; } /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal { margin: 0cm; margin-bottom: .0001pt; font-size: 11.0pt; font-family: "Calibri", "sans-serif"; mso-fareast-language: EN-US; } a:link, span.MsoHyperlink { mso-style-priority: 99; color: blue; text-decoration: underline; } a:visited, span.MsoHyperlinkFollowed { mso-style-priority: 99; color: purple; text-decoration: underline; } p.MsoAcetate, li.MsoAcetate, div.MsoAcetate { mso-style-priority: 99; mso-style-link: "Texto de balão Char"; margin: 0cm; margin-bottom: .0001pt; font-size: 8.0pt; font-family: "Tahoma", "sans-serif"; mso-fareast-language: EN-US; } span.EstiloDeEmail17 { mso-style-type: personal-compose; font-family: "Calibri", "sans-serif"; color: windowtext; } span.TextodebaloChar { mso-style-name: "Texto de balão Char"; mso-style-priority: 99; mso-style-link: "Texto de balão"; font-family: "Tahoma", "sans-serif"; } .MsoChpDefault { mso-style-type: export-only; font-family: "Calibri", "sans-serif"; mso-fareast-language: EN-US; } @page WordSection1 { size: 612.0pt 792.0pt; margin: 70.85pt 3.0cm 70.85pt 3.0cm; } div.WordSection1 { page: WordSection1; } --> </style> <!--[if gte mso 9]><xml> <o:shapedefaults v:ext="edit" spidmax="1026" /> </xml><![endif]--> <!--[if gte mso 9]><xml> <o:shapelayout v:ext="edit"> <o:idmap v:ext="edit" data="1" /> </o:shapelayout></xml><![endif]--> </head> <body lang=PT-BR link=blue vlink=purple> <div class=WordSection1> <p class=MsoNormal>Teste <o:p></o:p> </p> <p class=MsoNormal>Teste <o:p></o:p> </p> <p class=MsoNormal>Teste <o:p></o:p> </p> <p class=MsoNormal> <o:p>&nbsp;</o:p> </p> <p class=MsoNormal> <span style='mso-fareast-language:PT-BR'> <img width=1678 height=1009 id="Imagem_x0020_2" src="cid:image001.png@01D3BA15.6E238EE0"> </span> <o:p></o:p> </p> <p class=MsoNormal> <o:p>&nbsp;</o:p> </p> <p class=MsoNormal>Teste <o:p></o:p> </p> <p class=MsoNormal>Teste <o:p></o:p> </p> <p class=MsoNormal>Teste <o:p></o:p> </p> <p class=MsoNormal> <span style='mso-fareast-language:PT-BR'> <img width=1679 height=595 id="Imagem_x0020_3" src="cid:image002.png@01D3BA15.6E238EE0"> </span> <o:p></o:p> </p> <p class=MsoNormal> <o:p>&nbsp;</o:p> </p> <p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:PT-BR'>Atenciosamente, <o:p></o:p> </span> </p> <table class=MsoNormalTable border=0 cellpadding=0> <tr> <td style='padding:.75pt .75pt .75pt .75pt'> <p class=MsoNormal style='margin-top:15.0pt'> <span style='font-size:8.5pt;mso-fareast-language:PT-BR'> <img width=35 height=115 id="Imagem_x0020_1" src="cid:image003.jpg@01D3BA15.6E238EE0" alt="Descrição: http://www.kmm.com.br/_imagens/logo_assinatura.jpg"> <o:p></o:p> </span> </p> </td> <td style='padding:.75pt .75pt .75pt 15.0pt'> <p class=MsoNormal style='margin-top:15.0pt'> <b> <span lang=EN-US style='font-size:8.5pt;color:#990000;mso-fareast-language:PT-BR'>Jeferson Luis Indejejczak</span> </b> <span lang=EN-US style='font-size:8.5pt;color:#333333;mso-fareast-language:PT-BR'> <br> </span> <b> <span lang=EN-US style='font-size:8.5pt;color:black;mso-fareast-language:PT-BR'>Teste</span> </b> <span lang=EN-US style='font-size:8.5pt;color:#333333;mso-fareast-language:PT-BR'> <br> </span> <span style='font-size:8.5pt;color:#333333;mso-fareast-language:PT-BR'> <a href="mailto:jeferson.indejejczak@kmm.com.br"> <span lang=EN-US style='color:blue'>jeferson.indejejczak@kmm.com.br</span> </a> </span> <span style='font-size:8.5pt;color:#333333;mso-fareast-language:PT-BR'> <span lang=EN-US> <o:p></o:p> </span> </span> </p> <p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <b> <span style='font-size:8.5pt;color:#333333;mso-fareast-language:PT-BR'>KMM Engenharia de Sistemas</span> </b> <span style='font-size:8.5pt;color:#333333;mso-fareast-language:PT-BR'> <br>Rua Padre Anacleto, 396 &#8211; Nova Rússia <br>CEP 84.070-320 &#8211; Ponta Grossa &#8211; PR <br>Tel: (42) 3026-3000 <br> <a href="http://www.kmm.com.br/"> <span style='color:blue'>www.kmm.com.br</span> </a> <o:p></o:p> </span> </p> </td> </tr> </table> <p class=MsoNormal> <span style='mso-fareast-language:PT-BR'> <o:p>&nbsp;</o:p> </span> </p> <p class=MsoNormal> <o:p>&nbsp;</o:p> </p> </div> </body> </html> error: java.lang.ClassCastException: com.sun.mail.util.BASE64DecoderStream cannot be cast to javax.mail.internet.MimeMultipart 

Answer 1

您可能想嘗試使用ContentType類來解析ContentType，而不是使用String.split。

可以通過MimeBodyPart.getContentID方法訪問每個圖像主體部分的Content-ID標頭。