java 实现简单的邮件发送

1. 首先构建一个继承自javax.mail.Authenticator的具体类，重写里面的getPasswordAuthentication()方法。

/** * 邮箱认证信息 * @author Leon * */public class MyAuthenticator extends Authenticator {private String userName;private String password;public MyAuthenticator(){}public MyAuthenticator(String userName, String password) {this.userName = userName;this.password = password;}@Overrideprotected PasswordAuthentication getPasswordAuthentication() {return new PasswordAuthentication(userName, password);}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}}

2. 构建一个邮件pojo,注：提供get()/set()和toString()方法

/** * 邮件类 * @author Leon * */public class SimpleMail implements Serializable{/** 单发收件人邮箱 */private String recipient;/** 一大波收件人邮箱(若该属性有值，则采用群发) */private List<String> recipientList;/** 邮件主题 */private String subject;/** 邮件内容 */        private Object content;}

3.构建一个properties文件，该文件中存放SMTP服务器地址等参数。以及构造邮件内容等......

mail.username=[e-mail]=ffjwfvknqwmail.host=smtp.qq.commail.ssl=true#email templateemail.subject = Retrieve account password.email.header = <div>Hi, Dear user\:</div> <div>   we have already received your password request for password retrieve\: </div>email.footer = <div>Your Login password is %s.</div>

4. 接下来是怎样加载配置文件了，这里我是用的是Spring来加载

           <bean class="com.xuexi.utils.Config"><property name="ignoreUnresolvablePlaceholders" value="true"/><property name="locations"><list><value>classpath:/retrievePassword/*.properties</value></list></property></bean><bean id="simpleMail" class="com.xuexi.utils.mail.SimpleMailSender"><constructor-arg index="0" value="${mail.username}"/><constructor-arg index="1" value="${mail.pwd}"/><constructor-arg index="2" value="${mail.host}"/><constructor-arg index="3" value="${mail.ssl}"/></bean> 

5.构建好了邮件内容，并指定发送人，收信人，主题，内容等等。使用javax.mail.Transport工具类发送邮件。

import java.util.List;import java.util.Properties;import javax.mail.Message.RecipientType;import javax.mail.MessagingException;import javax.mail.Session;import javax.mail.Transport;import javax.mail.internet.AddressException;import javax.mail.internet.InternetAddress;import javax.mail.internet.MimeMessage;/** * 邮件发送类 * @author Leon * */public class SimpleMailSender {private Properties props;private MyAuthenticator auth;private Session session;/** * 发送邮件，若mail参数设置了recipientList属性，则采用群发，否则单发 * @param mail * @throws AddressException * @throws MessagingException */public void send(SimpleMail mail) throws AddressException, MessagingException{List<String> recipients = mail.getRecipientList();if(recipients != null && recipients.size() > 0){send(recipients, mail.getSubject(), mail.getContent());} else {send(mail.getRecipient(), mail.getSubject(), mail.getContent());}}public SimpleMailSender(){}/** *  * @param userName登录用户名  * @param password登录密码 * @param hostName邮箱服务名 */public SimpleMailSender(String userName, String password, String hostName){init(userName, password, hostName);}public SimpleMailSender(String userName, String password){// [e-mail] -> hostName=smtp.163.comString hostName = "smtp." + userName.split("@")[1];init(userName, password, hostName);}private void init(String userName, String password, String hostName){auth = new MyAuthenticator(userName, password);props = new Properties();props.put("mail.smtp.auth", "true");props.put("mail.smtp.host", hostName);session = Session.getInstance(props, auth);}public Properties getProps() {return props;}public void setProps(Properties props) {this.props = props;}public MyAuthenticator getAuth() {return auth;}public void setAuth(MyAuthenticator auth) {this.auth = auth;}public Session getSession() {return session;}public void setSession(Session session) {this.session = session;}/** * 单发 * @param recipient 收件人邮箱 * @param subject 主题 * @param content 内容 * @throws MessagingException  * @throws AddressException  */private void send(String recipient, String subject, Object content) throws AddressException, MessagingException{// 基于该session创建一封Mime邮件MimeMessage msg = new MimeMessage(session);// 设置发件人信息msg.setFrom(new InternetAddress(auth.getUserName()));// 设置收件人信息msg.setRecipient(RecipientType.TO, new InternetAddress(recipient));// 设置主题msg.setSubject(subject);// 设置内容及编码方式msg.setContent(content.toString(), "text/html;charset=utf-8");// 发送Transport.send(msg);}/** * 群发 * @param recipients 一大波收件人 * @param subject 邮件主题 * @param content 邮件内容 * @throws AddressException * @throws MessagingException */private void send(List<String> recipients, String subject, Object content) throws AddressException, MessagingException{MimeMessage msg = new MimeMessage(session);msg.setFrom(new InternetAddress(auth.getUserName()));// 一大波收件人的地址InternetAddress[] addrs = new InternetAddress[recipients.size()];for (int i = 0; i < addrs.length; i++) {addrs[i].setAddress(recipients.get(i));}// 设置收件人信息msg.setRecipients(RecipientType.TO, addrs);msg.setSubject(subject);msg.setContent(content.toString(), "text/html;charset=utf-8");Transport.send(msg);}}

6.测试结果