我用maven：重要的项目：
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>4.1.6.RELEASE</version>
</dependency>
<!-- java mail -->
<dependency>
<groupId>javax.mail</groupId>
<artifactId>javax.mail-api</artifactId>
<version>1.5.2</version>
</dependency>
<dependency>
<groupId>com.sun.mail</groupId>
<artifactId>javax.mail</artifactId>
<version>1.5.2</version>
</dependency>
配置org.springframework.mail.javamail.JavaMailSenderImpl：
<!-- Spring 代理 Javamail，这里使用网易邮箱 -->
<!-- 注意:这里的参数(如用户名、密码)都是针对邮件发送者的 -->
<bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
<property name="host">
<value>smtp.163.com</value>
</property>
<property name="javaMailProperties">
<props>
<prop key="mail.smtp.auth">true</prop>
<prop key="mail.smtp.timeout">25000</prop>
</props>
</property>
<property name="username">
<value>[email protected]</value>
</property>
<property name="password">
<value>xxxxxxxxxx</value>
</property>
</bean>
把org.springframework.mail.javamail.JavaMailSenderImpl注入其他bean并且调用以下方法：
/**
* Spring 代理 Javamail 发送邮件
* @param email
* @throws MessagingException
*/
private void sendMail(String email) throws MessagingException {
JavaMailSenderImpl senderImpl = new JavaMailSenderImpl();
MimeMessage mailMessage = senderImpl.createMimeMessage();
//设置utf-8或GBK编码，否则邮件会有乱码
MimeMessageHelper messageHelper = new MimeMessageHelper(mailMessage,true,"utf-8");
try {
messageHelper.setTo(email);//接受者
messageHelper.setFrom("[email protected]");//发送者
messageHelper.setSubject("欢迎加入 JAVAEYE™ 社区");//主题
//邮件内容，注意加参数true，表示启用html格式
String emailContent = "<html><head></head><body><h1>您已经注册！！</h1>"
+ "<h2>点击以下超链接激活账户以完成注册</h2><a href='http://localhost:8080/JavaEye/register_active?id="+user.getId()+"'>点击该超链接激活您的账户</a><br/>"
+ "<span>温馨提示：请勿回复本邮件</span></body></html>";
messageHelper.setText(emailContent,true);
sender.send(mailMessage);
/**
* 获取邮箱类型
*/
String emailType = user.getEmail().substring(user.getEmail().indexOf("@") + 1, user.getEmail().indexOf("."));
ActionContext actionContext = ActionContext.getContext();
Map<String, Object> session = actionContext.getSession();
session.put("emailType", emailType);
} catch (Exception e) {
e.printStackTrace();
}
}