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使用javamail發送html郵件比較復雜

1 package org.tatan.mail;
2
3 import javax.mail.internet.InternetAddress;
4 import javax.mail.internet.MimeMessage;
5 import javax.mail.internet.MimeUtility;
6 import javax.mail.Session;
7 import javax.mail.MessagingException;
8 import javax.mail.Transport;
9
10 public class SendHtmlMail {
11     public static void sendMessage(String smtpHost,
12                                    String from, String to,
13                                    String subject, String messageText)
14             throws MessagingException,java.io.UnsupportedEncodingException {
15
16         // Step 1:  Configure the mail session
17         System.out.println("Configuring mail session for: " + smtpHost);
18         java.util.Properties props = new java.util.Properties();
19         props.setProperty("mail.smtp.auth", "true");//指定是否需要SMTP驗證
20         props.setProperty("mail.smtp.host", smtpHost);//指定SMTP服務器
21         props.put("mail.transport.protocol", "smtp");
22         Session mailSession = Session.getDefaultInstance(props);
23         mailSession.setDebug(true);//是否在控制臺顯示debug信息
24
25         // Step 2:  Construct the message
26         System.out.println("Constructing message -  from=" + from + "  to=" + to);
27         InternetAddress fromAddress = new InternetAddress(from);
28         InternetAddress toAddress = new InternetAddress(to);
29
30         MimeMessage testMessage = new MimeMessage(mailSession);
31         testMessage.setFrom(fromAddress);
32         testMessage.addRecipient(javax.mail.Message.RecipientType.TO, toAddress);
33         testMessage.setSentDate(new java.util.Date());
34         testMessage.setSubject(MimeUtility.encodeText(subject,"gb2312","B"));
35
36         testMessage.setContent(messageText, "text/html;charset=gb2312");
37         System.out.println("Message constructed");
38
39         // Step 3:  Now send the message
40         Transport transport = mailSession.getTransport("smtp");
41         transport.connect(smtpHost, "webmaster", "password");
42         transport.sendMessage(testMessage, testMessage.getAllRecipients());
43         transport.close();
44
45
46         System.out.println("Message sent!");
47     }
48
49     public static void main(String[] args) {
50
51         String smtpHost = "localhost";
52         String from = "webmaster@mymail.com";
53         String to = "mfc42d@sohu.com";
54         String subject = "html郵件測試"; //subject javamail自動轉碼
55
56         StringBuffer theMessage = new StringBuffer();
57         theMessage.append("<h2><font color=red>這倒霉孩子</font></h2>");
58         theMessage.append("<hr>");
59         theMessage.append("<i>年年失望年年望</i>");
60
61         try {
62             SendHtmlMail.sendMessage(smtpHost, from, to, subject, theMessage.toString());
63         }
64         catch (javax.mail.MessagingException exc) {
65             exc.printStackTrace();
66         }
67         catch (java.io.UnsupportedEncodingException exc) {
68             exc.printStackTrace();
69         }
70     }
71 }
72

郵件頭(參見RFC822，RFC2047)只能包含US-ASCII字符。
郵件頭中任何包含非US-ASCII字符的部分必須進行編碼，使其只包含US-ASCII字符。
但是java mail可以根據JVM發送中文郵件自行編碼，，用它自帶的MimeUtility類的encodeText方法對中文信息進行編碼也可以。
郵件正文必須有charset=gb2312否則為
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit
打開郵件為亂碼,設置charset=gb2312后
Content-Type: text/html;charset=gb2312
Content-Transfer-Encoding: quoted-printable
它不能用MimeUtility里的方法來編碼。
郵件正文的編碼方式的信息是要放在Content-Transfer-Encoding這個郵件頭參數中的，
而MimeUtility里面的方法是將編碼方式的信息放在編碼后的正文內容中。
所以如果你對正文也用MimeUtility進行處理，那么其他郵件程序就不會正常顯示你編碼的郵件，
因為其他郵件軟件如outlook,foxmail只會根據Content-Transfer-Encoding這個里面的信息來對郵件正文進行解碼。