SpringBoot整合Mail

前言

SpringBoot实现邮件功能是很是的方便快捷的，由于SpringBoot默认有starter实现了Mail。
发送邮件应该是网站的必备功能之一，什么注册验证，忘记密码或者是给用户发送营销信息。
最先期的时候咱们会使用JavaMail相关api来写发送邮件的相关代码，后来spring退出了
JavaMailSender更加简化了邮件发送的过程，在以后springboot对此进行了封装就有了
如今的spring-boot-starter-mail。

1、基础配置

1.1 引入依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-mail</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-freemarker</artifactId>
</dependency>

1.2 获取QQ邮箱受权码

QQ邮箱->设置->帐户->POP3/SMTP服务:开启服务后会得到QQ的受权码.

1.3 Mail配置文件

1）qq邮箱的配置

# JavaMailSender 邮件发送的配置
spring.mail.host=smtp.qq.com
spring.mail.username=用户qq邮箱
#QQ邮箱的受权码
spring.mail.password=受权码
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true
spring.mail.properties.mail.smtp.starttls.required=true
spring.mail.default-encoding=UTF-8

2）163邮箱配置

spring.mail.host=smtp.163.com
spring.mail.username=用户163邮箱
spring.mail.password=邮箱密码
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true
spring.mail.properties.mail.smtp.starttls.required=true
spring.mail.default-encoding=UTF-8

2、实现过程

2.1 配置文件

spring:
  #邮箱配置
  mail:
    host: smtp.qq.com
    username: 917484312@qq.com
    #QQ邮箱的受权码
    password: 本身申请
    default-encoding: UTF-8
    properties:
      mail:
        smtp:
          auth: true
          starttls:
            enable: true
            required: true
  freemarker:
    content-type: text/html
    #后缀名
    suffix: .ftl
    template-loader-path: classpath:/templates
    charset: UTF-8
    check-template-location: true

  #freemarker配置




#设置一个邮件发送人
lance:
  mail:
    sender: 917484312@qq.com

2.2 实体Bean

/**
 * @author lance(ZYH)
 * @function  发送邮件-封装接受者信息
 * @date 2018-07-07 13:11
 */
@Data
public class MailBean implements Serializable {
    private String recipient;   //邮件接收人
    private String subject; //邮件主题
    private String content; //邮件内容

}

2.3 发送一个简单格式的邮件

public void sendSimpleMail(MailBean mailBean) {
        try {
            SimpleMailMessage simpleMailMessage = new SimpleMailMessage();
            //邮件发送人
            simpleMailMessage.setFrom(MAIL_SENDER);
            //邮件接收人
            simpleMailMessage.setTo(mailBean.getRecipient());
            //邮件主题
            simpleMailMessage.setSubject(mailBean.getSubject());
            //邮件内容
            simpleMailMessage.setText(mailBean.getContent());
            javaMailSender.send(simpleMailMessage);
        } catch (Exception e) {
            logger.error("邮件发送失败", e.getMessage());
        }
    }

2.4 发送一个HTML格式的邮件

public void sendHTMLMail(MailBean mailBean) {
        MimeMessage mimeMailMessage = null;
        try {
            mimeMailMessage = javaMailSender.createMimeMessage();
            MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMailMessage, true);
            mimeMessageHelper.setFrom(MAIL_SENDER);
            mimeMessageHelper.setTo(mailBean.getRecipient());
            mimeMessageHelper.setSubject(mailBean.getSubject());
            StringBuilder sb = new StringBuilder();
            sb.append("<h1>SpirngBoot测试邮件HTML</h1>")
                    .append("\"<p style='color:#F00'>你是真的太棒了！</p>")
                    .append("<p style='text-align:right'>右对齐</p>");
            mimeMessageHelper.setText(sb.toString(), true);
            javaMailSender.send(mimeMailMessage);
        } catch (Exception e) {
            logger.error("邮件发送失败", e.getMessage());
        }
    }

2.5 发送带附件格式的邮件

public void sendAttachmentMail(MailBean mailBean) {
        MimeMessage mimeMailMessage = null;
        try {
            mimeMailMessage = javaMailSender.createMimeMessage();
            MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMailMessage, true);
            mimeMessageHelper.setFrom(MAIL_SENDER);
            mimeMessageHelper.setTo(mailBean.getRecipient());
            mimeMessageHelper.setSubject(mailBean.getSubject());
            mimeMessageHelper.setText(mailBean.getContent());
            //文件路径
            FileSystemResource file = new FileSystemResource(new File("src/main/resources/static/image/mail.png"));
            mimeMessageHelper.addAttachment("mail.png", file);

            javaMailSender.send(mimeMailMessage);
        } catch (Exception e) {
            logger.error("邮件发送失败", e.getMessage());
        }
    }

效果：

2.6 发送带静态资源的邮件

public void sendInlineMail(MailBean mailBean) {
        MimeMessage mimeMailMessage = null;
        try {
            mimeMailMessage = javaMailSender.createMimeMessage();
            MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMailMessage, true);
            mimeMessageHelper.setFrom(MAIL_SENDER);
            mimeMessageHelper.setTo(mailBean.getRecipient());
            mimeMessageHelper.setSubject(mailBean.getSubject());
            mimeMessageHelper.setText("<html><body>带静态资源的邮件内容，这个一张IDEA配置的照片:<img src='cid:picture' /></body></html>", true);
            //文件路径
            FileSystemResource file = new FileSystemResource(new File("src/main/resources/static/image/mail.png"));
            mimeMessageHelper.addInline("picture", file);

            javaMailSender.send(mimeMailMessage);
        } catch (Exception e) {
            logger.error("邮件发送失败", e.getMessage());
        }
    }

2.7 发送基于Freemarker模板的邮件

public void sendTemplateMail(MailBean mailBean) {
        MimeMessage mimeMailMessage = null;
        try {
            mimeMailMessage = javaMailSender.createMimeMessage();
            MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMailMessage, true);
            mimeMessageHelper.setFrom(MAIL_SENDER);
            mimeMessageHelper.setTo(mailBean.getRecipient());
            mimeMessageHelper.setSubject(mailBean.getSubject());

            Map<String, Object> model = new HashMap<String, Object>();
            model.put("content", mailBean.getContent());
            model.put("title", "标题Mail中使用了FreeMarker");
            Template template = configuration.getTemplate("mail.ftl");
            String text = FreeMarkerTemplateUtils.processTemplateIntoString(template, model);
            mimeMessageHelper.setText(text, true);

            javaMailSender.send(mimeMailMessage);
        } catch (Exception e) {
            logger.error("邮件发送失败", e.getMessage());
        }

    }

效果：

2.8 发送基于 thymeleaf为模板的邮件

1）pom中导入thymeleaf的包

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

2）在resorces/templates下建立emailTemplate.html

<!DOCTYPE html>
<html lang="zh" xmlns:th="http://www.thymeleaf.org">
    <head>
        <meta charset="UTF-8"/>
        <title>Title</title>
    </head>
    <body>
        您好,这是验证邮件,请点击下面的连接完成验证,<br/>
        <a href="#" th:href="@{ http://www.ityouknow.com/neo/{id}(id=${id}) }">激活帐号</a>
    </body>
</html>

3）解析模板并发送

@Test
public void sendTemplateMail() {
    //建立邮件正文
    Context context = new Context();
    context.setVariable("id", "006");
    String emailContent = templateEngine.process("emailTemplate", context);

    mailService.sendHtmlMail("ityouknow@126.com","主题：这是模板邮件",emailContent);
}

3、邮件服务的问题

3.1 邮件发送失败

由于各类缘由，总会有邮件发送失败的状况，好比：邮件发送过于频繁、网络异常等。在出现这种状况的时候，
咱们通常会考虑从新重试发送邮件，会分为如下几个步骤来实现：

• 接收到发送邮件请求，首先记录请求而且入库。
• 调用邮件发送接口发送邮件，而且将发送结果记录入库。
• 启动定时系统扫描时间段内，未发送成功而且重试次数小于3次的邮件，进行再次发送。

3.2 邮件异步发送

不少时候邮件发送并非咱们主业务必须关注的结果，好比通知类、提醒类的业务能够容许延时或者失败。
这个时候能够采用异步的方式来发送邮件，加快主交易执行速度，在实际项目中能够采用MQ发送邮件相关
参数，监听到消息队列以后启动发送邮件。

4、项目代码地址

https://github.com/LanceToBigData/SpringBootLearning/tree/develop/SpringBoot-Mail