import java.util.List;
import java.util.Properties;import javax.mail.Authenticator;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMessage.RecipientType;/*** 简单邮件发送器，可单发，群发。* * @author humingfeng* */
public class MailServer {/*** 发送邮件的props文件*/private final transient Properties props = System.getProperties();/*** 邮件服务器登录验证*/private transient MailAuthenticator authenticator;/*** 邮箱session*/private transient Session session;/*** 初始化邮件发送器* * @param smtpHostName*            SMTP邮件服务器地址* @param username*            发送邮件的用户名(地址)* @param password*            发送邮件的密码*/public MailServer(final String smtpHostName, final String username,final String password) {init(username, password, smtpHostName);}/*** 初始化邮件发送器* * @param username*            发送邮件的用户名(地址)，并以此解析SMTP服务器地址* @param password*            发送邮件的密码*/public MailServer(final String username, final String password) {// 通过邮箱地址解析出smtp服务器，对大多数邮箱都管用final String smtpHostName = "smtp." + username.split("@")[1];init(username, password, smtpHostName);}/*** 初始化* * @param username*            发送邮件的用户名(地址)* @param password*            密码* @param smtpHostName*            SMTP主机地址*/private void init(String username, String password, String smtpHostName) {// 初始化propsprops.put("mail.smtp.auth", "true");props.put("mail.smtp.host", smtpHostName);if(smtpHostName==null)props.put("mail.smtp.host", smtpHostName);// 验证authenticator = new MailAuthenticator(username, password);// 创建sessionsession = Session.getInstance(props, authenticator);}/*** 发送邮件* * @param recipient*            收件人邮箱地址* @param subject*            邮件主题* @param content*            邮件内容* @throws AddressException* @throws MessagingException*/public void send(String recipient, String subject, Object content)throws AddressException, MessagingException {// 创建mime类型邮件final MimeMessage message = new MimeMessage(session);// 设置发信人message.setFrom(new InternetAddress(authenticator.getUsername()));// 设置收件人if(recipient!=null&&recipient.indexOf(";")!=-1){//多收件人String[] rec = recipient.split(";");int len = rec.length;InternetAddress[] iad = new InternetAddress[len];for(int i=0; i<len; i++){iad[i] =  new InternetAddress(rec[i]);}message.setRecipients(RecipientType.TO, iad);}else{//单收件人message.setRecipient(RecipientType.TO, new InternetAddress(recipient));}// 设置主题message.setSubject(subject);// 设置邮件内容message.setContent(content.toString(), "text/html;charset=utf-8");
//      message.setText(content.toString(), "GBK");// 发送Transport.send(message);}/*** 群发邮件* * @param recipients*            收件人们* @param subject*            主题* @param content*            内容* @throws AddressException* @throws MessagingException*/public void send(List<String> recipients, String subject, Object content)throws AddressException, MessagingException {// 创建mime类型邮件final MimeMessage message = new MimeMessage(session);// 设置发信人message.setFrom(new InternetAddress(authenticator.getUsername()));// 设置收件人们final int num = recipients.size();InternetAddress[] addresses = new InternetAddress[num];for (int i = 0; i < num; i++) {addresses[i] = new InternetAddress(recipients.get(i));}message.setRecipients(RecipientType.TO, addresses);// 设置主题message.setSubject(subject);// 设置邮件内容message.setContent(content.toString(), "text/html;charset=utf-8");// 发送Transport.send(message);}/*** 服务器邮箱登录验证* * @author MZULE* */public class MailAuthenticator extends Authenticator {/*** 用户名（登录邮箱）*/private String username;/*** 密码*/private String password;/*** 初始化邮箱和密码* * @param username*            邮箱* @param password*            密码*/public MailAuthenticator(String username, String password) {this.username = username;this.password = password;}String getPassword() {return password;}@Overrideprotected PasswordAuthentication getPasswordAuthentication() {return new PasswordAuthentication(username, password);}String getUsername() {return username;}public void setPassword(String password) {this.password = password;}public void setUsername(String username) {this.username = username;}}
}

2.2 怎么简单使用

import javax.mail.MessagingException;
import javax.mail.internet.AddressException;/*** @author **/
public class MailSender {/*** 服务邮箱*/private static MailServer mailServer = null;//private static String userName;private static String password;private static String stmp;/*** @param userName the userName to set*/public void setUserName(String userName) {if(MailSender.userName==null)MailSender.userName = userName;}/*** @param password the password to set*/public void setPassword(String password) {if(MailSender.password==null)MailSender.password = password;}/*** @param stmp the stmp to set*/public void setStmp(String stmp) {if(MailSender.stmp==null)MailSender.stmp = stmp;}/*** 使用默认的用户名和密码发送邮件* @param recipient* @param subject* @param content* @throws MessagingException * @throws AddressException */public static void sendHtml(String recipient, String subject, Object content) throws AddressException, MessagingException{if (mailServer == null) mailServer = new MailServer(stmp,userName,password);mailServer.send(recipient, subject, content);}/*** 使用指定的用户名和密码发送邮件* @param server* @param password* @param recipient* @param subject* @param content* @throws MessagingException * @throws AddressException */public static void sendHtml(String server,String password,String stmpIp, String recipient, String subject, Object content) throws AddressException, MessagingException{new MailServer(stmpIp,server,password).send(recipient, subject, content);}public static void main(String[] args) {try {String s = "ceshi2:<br/>您好,我在给你们演示发邮件看见了没.";sendHtml("humf@vip.qq.com","password","IP", "humf@vip.qq.com", "我是是是", s);} catch (AddressException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (MessagingException e) {// TODO Auto-generated catch blocke.printStackTrace();}}
}