关键技术： 1、MimeMessage的setRecipients方法设置邮件的收件人，其中Message.RecipientType.TO常量表示收件人类型是邮件接收者，Message.RecipientType.CC常量表示收件人类型是抄送者，Message.RecipientType.BCC常量表示收件人的类型是密送着。2、在调用MimeMessage的setRecipients方法时，除了可以指定收件人的类型外，还可以传入一个数组，指定多个收件人的地址。
SourceCode:import javax.mail.Address;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;public class MultiMailsender {/*** 发送邮件给多个接收者* @param mailInfo    带发送邮件的信息* @return*/public static boolean sendMailtoMultiReceiver(MultiMailSenderInfo mailInfo){MyAuthenticator authenticator = null;if (mailInfo.isValidate()) {authenticator = new MyAuthenticator(mailInfo.getUserName(),mailInfo.getPassword());}Session sendMailSession = Session.getInstance(mailInfo.getProperties(), authenticator);try {Message mailMessage = new MimeMessage(sendMailSession);// 创建邮件发送者地址Address from = new InternetAddress(mailInfo.getFromAddress());mailMessage.setFrom(from);// 创建邮件的接收者地址，并设置到邮件消息中Address[] tos = null;String[] receivers = mailInfo.getReceivers();if (receivers != null){// 为每个邮件接收者创建一个地址tos = new InternetAddress[receivers.length + 1];tos[0] = new InternetAddress(mailInfo.getToAddress());for (int i=0; i<receivers.length; i++){tos[i+1] = new InternetAddress(receivers[i]);}} else {tos = new InternetAddress[1];tos[0] = new InternetAddress(mailInfo.getToAddress());}// 将所有接收者地址都添加到邮件接收者属性中mailMessage.setRecipients(Message.RecipientType.TO, tos);mailMessage.setSubject(mailInfo.getSubject());mailMessage.setSentDate(new Date());// 设置邮件内容Multipart mainPart = new MimeMultipart();BodyPart html = new MimeBodyPart();html.setContent(mailInfo.getContent(), "text/html; charset=GBK");mainPart.addBodyPart(html);mailMessage.setContent(mainPart);// 发送邮件Transport.send(mailMessage);return true;} catch (MessagingException ex) {ex.printStackTrace();}return false;}/*** 发送带抄送的邮件* @param mailInfo    待发送邮件的消息* @return*/public static boolean sendMailtoMultiCC(MultiMailSenderInfo mailInfo){MyAuthenticator authenticator = null;if (mailInfo.isValidate()) {authenticator = new MyAuthenticator(mailInfo.getUserName(),mailInfo.getPassword());}Session sendMailSession = Session.getInstance(mailInfo.getProperties(), authenticator);try {Message mailMessage = new MimeMessage(sendMailSession);// 创建邮件发送者地址Address from = new InternetAddress(mailInfo.getFromAddress());mailMessage.setFrom(from);// 创建邮件的接收者地址，并设置到邮件消息中Address to = new InternetAddress(mailInfo.getToAddress());mailMessage.setRecipient(Message.RecipientType.TO, to);// 获取抄送者信息String[] ccs = mailInfo.getCcs();if (ccs != null){// 为每个邮件接收者创建一个地址Address[] ccAdresses = new InternetAddress[ccs.length];for (int i=0; i<ccs.length; i++){ccAdresses[i] = new InternetAddress(ccs[i]);}// 将抄送者信息设置到邮件信息中，注意类型为Message.RecipientType.CCmailMessage.setRecipients(Message.RecipientType.CC, ccAdresses);} mailMessage.setSubject(mailInfo.getSubject());mailMessage.setSentDate(new Date());// 设置邮件内容Multipart mainPart = new MimeMultipart();BodyPart html = new MimeBodyPart();html.setContent(mailInfo.getContent(), "text/html; charset=GBK");mainPart.addBodyPart(html);mailMessage.setContent(mainPart);// 发送邮件Transport.send(mailMessage);return true;} catch (MessagingException ex) {ex.printStackTrace();}return false;}public static void main(String[] args) {// 创建邮件信息MultiMailSenderInfo mailInfo = new MultiMailSenderInfo();mailInfo.setMailServerHost("smtp.sina.com.cn");mailInfo.setMailServerPort("25");mailInfo.setValidate(true);mailInfo.setUserName("***");mailInfo.setPassword("***");mailInfo.setFromAddress("***@sina.com");mailInfo.setToAddress("***@163.com");mailInfo.setSubject("MyMail测试");mailInfo.setContent("我的邮件测试/n/rMy test mail/n/r");String[] receivers = new String[]{"***@163.com", "***@tom.com"};String[] ccs = receivers;mailInfo.setReceivers(receivers);mailInfo.setCcs(ccs);MultiMailsender.sendMailtoMultiReceiver(mailInfo);MultiMailsender.sendMailtoMultiCC(mailInfo);}/*** 发送多接收者类型邮件的基本信息*/public static class MultiMailSenderInfo extends MailSenderInfo{// 邮件的接收者，可以有多个private String[] receivers;// 邮件的抄送者，可以有多个private String[] ccs;public String[] getCcs() {return ccs;}public void setCcs(String[] ccs) {this.ccs = ccs;}public String[] getReceivers() {return receivers;}public void setReceivers(String[] receivers) {this.receivers = receivers;}}
}