25、springboot发送邮件

啊·虽然现在短信验证已经最流行也是最常用的验证方式；但是邮件验证还是必不可少，依然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都是可以使用邮件发送功能的。最早期使用JavaMail的相关api来进行发送邮件的功能开发，后来spring整合了JavaMail的相关api推出了JavaMailSender更加简化了邮件发送的代码编写，现在springboot对此进行了封装就有了现在的spring-boot-starter-mail。

1、新建项目sc-mail，对应的pom.xml文件如下

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>spring-cloud</groupId>
    <artifactId>sc-mail</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>sc-mail</name>
    <url>http://maven.apache.org</url>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
    </parent>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

        </dependencies>
    </dependencyManagement>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>

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


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

    </dependencies>
</project>

2、新建配置文件application.yml

spring:
  application:
    name: sc-mail
  mail:
    host: smtp.qq.com #邮箱服务器地址
    port: 465
    username: [e-mail] #用户名
    password: vfcqhwsnnwugbhcx #密码 （改成自己的密码）
    default-encoding: UTF-8
    properties:
      mail:
        smtp:
          ssl:
            enable:
              true

3、新建邮件发送服务类

package sc.mail.service.impl;

import java.io.File;

import javax.mail.internet.MimeMessage;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.FileSystemResource;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;

import sc.mail.service.MailService;

@Service
public class MailServiceImpl implements MailService {

    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    @Autowired
    private JavaMailSender mailSender;

    /**
     * 文本
     * @param from
     * @param to
     * @param subject
     * @param content
     */
    @Override
    public void sendSimpleMail(String from, String to, String subject, String content) {
        SimpleMailMessage message = new SimpleMailMessage();
        message.setFrom(from);
        message.setTo(to);
        message.setSubject(subject);
        message.setText(content);
        try {
            mailSender.send(message);
            logger.info("simple mail had send。");
        } catch (Exception e) {
            logger.error("send mail error", e);
        }
    }

    /**
     * @param from
     * @param to
     * @param subject
     * @param content
     */
    public void sendTemplateMail(String from, String to, String subject, String content) {
        MimeMessage message = mailSender.createMimeMessage();
        try {
            //true表示需要创建一个multipart message
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
            helper.setFrom(from);
            helper.setTo(to);
            helper.setSubject(subject);
            helper.setText(content, true);
            mailSender.send(message);
            logger.info("send template success");
        } catch (Exception e) {
            logger.error("send template eror", e);
        }
    }


    /**
     * 附件
     * 
     * @param from
     * @param to
     * @param subject
     * @param content
     * @param filePath
     */
    public void sendAttachmentsMail(String from, String to, String subject, String content, String filePath){
        MimeMessage message = mailSender.createMimeMessage();
        try {
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
            helper.setFrom(from);
            helper.setTo(to);
            helper.setSubject(subject);
            helper.setText(content, true);
            FileSystemResource file = new FileSystemResource(new File(filePath));
            String fileName = filePath.substring(filePath.lastIndexOf(File.separator));
            helper.addAttachment(fileName, file);
            mailSender.send(message);
            logger.info("send mail with attach success。");
        } catch (Exception e) {
            logger.error("send mail with attach success", e);
        }
    }


    /**
     * 发送内嵌图片
     * 
     * @param from
     * @param to
     * @param subject
     * @param content
     * @param imgPath
     * @param imgId
     */
    public void sendInlineResourceMail(String from, String to, String subject, String content,
            String imgPath, String imgId){
        MimeMessage message = mailSender.createMimeMessage();
        try {
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
            helper.setFrom(from);
            helper.setTo(to);
            helper.setSubject(subject);
            helper.setText(content, true);
            FileSystemResource res = new FileSystemResource(new File(imgPath));
            helper.addInline(imgId, res);
            mailSender.send(message);
            logger.info("send inner resources success。");
        } catch (Exception e) {
            logger.error("send inner resources fail", e);
        }
    }

}

4、新建测试类

package sc.mail;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import sc.mail.service.MailService;

@RunWith(SpringRunner.class)
@SpringBootTest
public class MailSendTest {

    @Autowired
    private MailService mailService;

    @Test
    public void sendSimpleMailTest() {
        mailService.sendSimpleMail("[e-mail]", "[e-mail]", 
                "sendSimpleMailTest", "sendSimpleMailTest from [e-mail]");
    }

    @Test
    public void sendTemplateMailTest() {
        String html = "<html><body>"
                + " <div> "
                + "    sendTemplateMailTest from [e-mail] </br>"
                + "    <b>这是模板邮件</b>"
                + "</div>"
                + "</body></html>";
        mailService.sendTemplateMail("[e-mail]", "[e-mail]", 
                "sendTemplateMailTest", html);
    }

    @Test
    public void sendAttachmentsMailTest() {
        String filePath = "D:\\springcloudws\\sc-mail\\src\\main\\java\\sc\\mail\\service\\impl\\MailServiceImpl.java";
        mailService.sendAttachmentsMail("[e-mail]", "[e-mail]", 
                "sendAttachmentsMailTest", "sendAttachmentsMailTest from [e-mail]", filePath);
    }

    @Test
    public void sendInlineResourceMailTest() {
        String imgId = "img1";

        String content = "<html><body>"
                + "sendInlineResourceMailTest：<img src=\'cid:" + imgId + "\' >"
                        + "</body></html>";

        String imgPath = "D:\\springcloudws\\sc-mail\\src\\main\\resources\\20181015223228.jpg";

        mailService.sendInlineResourceMail("[e-mail]", "[e-mail]", 
                "sendAttachmentsMailTest", content, imgPath, imgId);
    }

}

5、运行测试类验证是否发送邮件成功
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简单邮件

模板邮件


附件邮件

内嵌图片邮件