使用javamail发送html邮件比较复杂
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验证
props.setProperty("mail.smtp.host", smtpHost);//指定SMTP服务器
props.put("mail.transport.protocol", "smtp");
Session mailSession = Session.getDefaultInstance(props);
mailSession.setDebug(true);//是否在控制台显示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邮件测试"; //subject javamail自动转码
StringBuffer theMessage = new StringBuffer();
theMessage.append("<h2><font color=red>这倒霉孩子</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();
}
}
}
邮件头(参见RFC822，RFC2047)只能包含US-ASCII字符。
邮件头中任何包含非US-ASCII字符的部分必须进行编码，使其只包含US-ASCII字符。
但是java mail可以根据JVM发送中文邮件自行编码，，用它自带的MimeUtility类的encodeText方法对中文信息进行编码也可以。
邮件正文必须有charset=gb2312否则为
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit
打开邮件为乱码,设置charset=gb2312后
Content-Type: text/html;charset=gb2312
Content-Transfer-Encoding: quoted-printable
它不能用MimeUtility里的方法来编码。
邮件正文的编码方式的信息是要放在Content-Transfer-Encoding这个邮件头参数中的，
而MimeUtility里面的方法是将编码方式的信息放在编码后的正文内容中。
所以如果你对正文也用MimeUtility进行处理，那么其他邮件程序就不会正常显示你编码的邮件，
因为其他邮件软件如outlook,foxmail只会根据Content-Transfer-Encoding这个里面的信息来对邮件正文进行解码。