Java使用Spring发邮件

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mail.MailSender;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.stereotype.Service;

@Service("mailService")
public class MailService {

    @Autowired
    private MailSender mailSender;
    @Autowired
    private SimpleMailMessage alertMailMessage;

    public void sendMail(String from, String to, String subject, String body) {

        SimpleMailMessage message = new SimpleMailMessage();

        message.setFrom(from);
        message.setTo(to);
        message.setSubject(subject);
        message.setText(body);
        mailSender.send(message);

    }

    public void sendAlertMail(String alert) {

        SimpleMailMessage mailMessage = new SimpleMailMessage(alertMailMessage);
        mailMessage.setText(alert);
        mailSender.send(mailMessage);

    }

}

用了spring就得配置xml，配置文件如下：

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:jee="http://www.springframework.org/schema/jee" 
    xmlns:task="http://www.springframework.org/schema/task"
    xsi:schemaLocation="
            http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
            http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
            http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd
            http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
            http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.0.xsd"
>

    <context:component-scan base-package="cn.outofmemory.spring.mail" />    

    <bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
        <property name="host" value="smtp.gmail.com"/>
        <property name="port" value="25"/>
        <property name="username" value="myusername@gmail.com"/>
        <property name="password" value="mypassword"/>
        <property name="javaMailProperties">
            <props>
                <!-- Use SMTP transport protocol -->
                <prop key="mail.transport.protocol">smtp</prop>
                <!-- Use SMTP-AUTH to authenticate to SMTP server -->
                <prop key="mail.smtp.auth">true</prop>
                <!-- Use TLS to encrypt communication with SMTP server -->
                <prop key="mail.smtp.starttls.enable">true</prop>
                <prop key="mail.debug">true</prop>
            </props>
        </property>
    </bean>

    <bean id="alertMailMessage" class="org.springframework.mail.SimpleMailMessage">
        <property name="from">            
            <value>myusername@gmail.com</value>
        </property>
        <property name="to">            
            <value>myusername@gmail.com</value>
        </property>
        <property name="subject" value="Alert - Exception occurred. Please investigate"/>
    </bean>

</beans>

如果你要用Gmail发邮件，需要确认JavaMail属性正确配置：

host=smtp.gmail.com
port=25 username=your-gmail-username
password=your-gmail-password
mail.transport.protocol=smtp
mail.smtp.auth=true mail.smtp.starttls.enable=true

最后是测试代码：

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;

public class MailServiceTest {

    public static void main(String[] args) {

        ApplicationContext context = new FileSystemXmlApplicationContext("conf/spring.xml");

        MailService mailService = (MailService) context.getBean("mailService");

        mailService.sendMail("myusername@gmail.com", "myusername@gmail.com", "Testing123", "Testing only \n\n Hello Spring Email Sender");

        mailService.sendAlertMail("Exception occurred");

    }

}

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