Spring Boot结合Velocity模板发送邮件

MailSender: 是核心的发送邮件的接口
SimpleMailMessage: 可以设置邮件的发送者，以及接收者(接受者可以有多个)
具体很多Spring封装的类的用法参考官方文档：
http://docs.spring.io/spring/docs/4.2.5.RELEASE/spring-framework-reference/htmlsingle/#mail

1、首先项目是一个maven项目，在pom文件中加入starter的依赖：

    
    org.springframework.boot            
    spring-boot-starter-mail

    
    org.springframework.boot   
    spring-boot-starter-velocity

2、在Spring Boot的配置文件里加入如下配置：

#application.yml
spring:  
  velocity:    
    resource-loader-path: classpath:/templates/    
    charset: UTF-8
mail:  
  host: [email protected]  # 发送邮件的smtp服务器  
  username: ijiaobu  # 用户名  
  password: so$nice   # 登陆smtp服务器的密码  
  from: [email protected]    #注册的smtp服务器的邮箱

并定义对应的properties配置：

// MailProperties.java
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@ConfigurationProperties(prefix = "mail")
@Component
public class MailProperties {
    private String host;
    private String username;
    private String password;
    private String from;

    public String getHost() {
        return host;
    }

    public void setHost(String host) {
        this.host = host;
    }

    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;
    }

    public String getFrom() {
        return from;
    }

    public void setFrom(String from) {
        this.from = from;
    }

    @Override
    public String toString() {
        return "EboxEmailProperties{" +
                "host='" + host + '\'' +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", from='" + from + '\'' +
                '}';
    }
}

3、JavaMailSender读取配置并注入到Spring的IOC容器中：

// MailingConfiguration.java
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.JavaMailSenderImpl;

import java.util.Properties;

@Configuration
public class MailingConfiguration {
    @Autowired
    private BulbEmailProperties portalEmailProperties;

    @Bean
    public JavaMailSender getJavaMailSender() {
        JavaMailSenderImpl javaMailSender = new JavaMailSenderImpl();
        javaMailSender.setProtocol("smtp");
        javaMailSender.setHost(portalEmailProperties.getHost());
        javaMailSender.setUsername(portalEmailProperties.getUsername());
        javaMailSender.setPassword(portalEmailProperties.getPassword());
        javaMailSender.setJavaMailProperties(getMailProperties());

        return javaMailSender;

    }

    private Properties getMailProperties() {
        Properties properties = new Properties();
        properties.setProperty("mail.smtp.auth", "true");
        properties.setProperty("mail.smtp.starttls.enable", "true");
        properties.setProperty("mail.debug", "false");
        return properties;
    }
}

4、使用Velocity定义邮件模板：
在resources目录下：

Paste_Image.png

建立对应的模板文件：

    
        
Hi friend, we are testing registration confirmation :)!
        Click this link to activate...........
        

            
 ${url}
        
        ${currentDate}
    

5、下面写一个controller测试一下吧，balabala

import org.apache.velocity.app.VelocityEngine;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.mail.javamail.MimeMessagePreparator;
import org.springframework.ui.velocity.VelocityEngineUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

@RestController
public class TestSendMail {
    @Autowired
    private BulbEmailProperties portalEmailProperties;
    @Autowired
    private JavaMailSender javaMailSender;
    @Autowired
    private VelocityEngine velocityEngine;

    @RequestMapping("/testSendMail")
    public String testSendMail() {
        sendRegist("http://www.jiaobuchong.com/uuid/userId/1242425353");
        return "ok";
    }

    private void sendRegist(String url) {
        MimeMessagePreparator preparator = new MimeMessagePreparator() {
            @Override
            public void prepare(MimeMessage mimeMessage) throws Exception {
                MimeMessageHelper message = new MimeMessageHelper(mimeMessage, "utf-8");   // 设置 utf-8防止出现乱码
                message.setTo("[email protected]");
                message.setFrom(new InternetAddress(portalEmailProperties.getFrom()));
                message.setSubject("Registration Confirmation");
                Map model = new HashMap<>();
                model.put("url", url);
                model.put("currentDate", "2016-03-31");

                message.setText(VelocityEngineUtils.mergeTemplateIntoString(velocityEngine, "register.vm", "utf-8", model), true);
            }
        };
      try {
          this.javaMailSender.send(preparator);
      } catch (MailException ex) {
          ex.printStackTrace();
      }
    }
}

That's all, 玩去吧！！！
参考链接：

http://www.quweiji.com/%E5%8F%91%E9%80%81%E9%82%AE%E4%BB%B6-spring-velocity/
http://andresmerida1.blogspot.com/2016/03/mailing-with-spring-framework-425.html
http://blog.codeleak.pl/2014/09/testing-mail-code-in-spring-boot.html
http://m.blog.csdn.net/article/details?id=46545491