使用javamail發送html郵件比較復雜

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package org.tatan.mail;

import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeUtility;
import javax.mail.Session;
import javax.mail.MessagingException;
import javax.mail.Transport;

public class SendHtmlMail {
??? public static void sendMessage(String smtpHost,
?????????????????????????????????? String from, String to,
?????????????????????????????????? String subject, String messageText)
??????????? throws MessagingException,java.io.UnsupportedEncodingException {

??????? // Step 1:? Configure the mail session
??????? System.out.println("Configuring mail session for: " + smtpHost);
??????? java.util.Properties props = new java.util.Properties();
??????? props.setProperty("mail.smtp.auth", "true");//指定是否需要SMTP驗證
??????? props.setProperty("mail.smtp.host", smtpHost);//指定SMTP服務器
??????? props.put("mail.transport.protocol", "smtp");
??????? Session mailSession = Session.getDefaultInstance(props);
??????? mailSession.setDebug(true);//是否在控制臺顯示debug信息

??????? // Step 2:? Construct the message
??????? System.out.println("Constructing message -? from=" + from + "? to=" + to);
??????? InternetAddress fromAddress = new InternetAddress(from);
??????? InternetAddress toAddress = new InternetAddress(to);

??????? MimeMessage testMessage = new MimeMessage(mailSession);
??????? testMessage.setFrom(fromAddress);
??????? testMessage.addRecipient(javax.mail.Message.RecipientType.TO, toAddress);
??????? testMessage.setSentDate(new java.util.Date());
??????? testMessage.setSubject(MimeUtility.encodeText(subject,"gb2312","B"));

??????? testMessage.setContent(messageText, "text/html;charset=gb2312");
??????? System.out.println("Message constructed");

??????? // Step 3:? Now send the message
??????? Transport transport = mailSession.getTransport("smtp");
??????? transport.connect(smtpHost, "webmaster", "password");
??????? transport.sendMessage(testMessage, testMessage.getAllRecipients());
??????? transport.close();

??????? System.out.println("Message sent!");
??? }

??? public static void main(String[] args) {

??????? String smtpHost = "localhost";
??????? String from = "webmaster@mymail.com";
??????? String to = "mfc42d@sohu.com";
??????? String subject = "html郵件測試"; //subject javamail自動轉碼

??????? StringBuffer theMessage = new StringBuffer();
??????? theMessage.append("<h2><font color=red>這倒霉孩子</font></h2>");
??????? theMessage.append("<hr>");
??????? theMessage.append("<i>年年失望年年望</i>");

??????? try {
??????????? SendHtmlMail.sendMessage(smtpHost, from, to, subject, theMessage.toString());
??????? }
??????? catch (javax.mail.MessagingException exc) {
??????????? exc.printStackTrace();
??????? }
??????? catch (java.io.UnsupportedEncodingException exc) {
??????????? exc.printStackTrace();
??????? }
??? }
}
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。