Spring中使用JavaMailSenderImpl发送邮件
### ApplicationContext.xml：
```html
<!-- JavaMail相关配置 -->
<bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl" >
<property name="host" value="发件服务器"></property>
<property name="username" value="用户名"></property>
<property name="password" value="密码"></property>
<property name="protocol" value="smtp"></property>
<property name="defaultEncoding" value="utf-8"></property>
<property name="javaMailProperties">
<props>
<prop key="mail.smtp.auth">true</prop>
<prop key="mail.smtp.from">demo@zhenzhigu.com</prop>
<prop key="mail.debug">true</prop>
</props>
</property>
</bean>
```
### 使用注解从Spring容器中注入mailSender对象：
```
@Autowired
private JavaMailSenderImpl sender;
```
准备一封简单的邮件：
```
// 构建简单邮件对象，见名知意
SimpleMailMessage smm = new SimpleMailMessage();
// 设定邮件参数
smm.setFrom(sender.getUsername());
smm.setTo("1500506007@qq.com");
smm.setSubject("Hello world");
smm.setText("Hello world via spring mail sender");
```
发送邮件：
```
sender.send(smm);
```
如果你想发送带有附件的邮件：
```java
/**
* 发送带附件的邮件，可指定附件名
* @param to
* @param subject
* @param text
* @param file
* @throws MessagingException
*/
public static void send(String to,String subject,String text,
String fileName,File file) throws MessagigException{
//使用JavaMail的MimeMessage，支付更加复杂的邮件格式和内容
MimeMessage msg = sender.createMimeMessage();
//创建MimeMessageHelper对象，处理MimeMessage的辅助类
MimeMessageHelper helper = new MimeMessageHelper(msg, true);
//使用辅助类MimeMessage设定参数
helper.setFrom(sender.getUsername());
helper.setTo(to);
helper.setSubject(subject);
helper.setText(text,true);
//加入附件
if(file!=null)helper.addAttachment(fileName, file);
//发送邮件
sender.send(msg);
}
```