1.配置项目文件目录，我配置的是这样的：

2：配置pom.xml

参照对比添加包依赖

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- 邮件 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-mail</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <dependency> <groupId>com.vaadin.external.google</groupId> <artifactId>android-json</artifactId> <version>RELEASE</version> <scope>compile</scope> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.testng</groupId> <artifactId>testng</artifactId> <version>RELEASE</version> <scope>compile</scope> </dependency>

3：配置application.properties文件

获取邮箱授权码的方式可以自行百度。

#邮箱服务器地址 spring.mail.host=smtp.qq.com #发件人地址 spring.mail.username=xxxx@qq.com #邮箱的授权码 spring.mail.password=xxxxx spring.mail.default-encoding=utf-8 #发件人 mail.fromMail.addr=xxxxx@qq.com

4. 配置MailService和MailServiceImpl文件

MailService文件

package com.email.service; public interface MailService { //发送普通邮件 void sendSimpleMail(String to,String subject,String content); //发送Html邮件 void sendHtmlMail(String to,String subject,String content); //发送带附件的邮件 void sendAttachmentMail(String to,String subject,String content,String filePath); }

 MailServiceImpl文件

package com.email.service.impl; import com.email.service.MailService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Value; 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.Component; import org.springframework.stereotype.Service; import javax.mail.MessagingException; import javax.mail.internet.MimeMessage; import java.io.File; @Service @Component public class MailServiceImpl implements MailService { @Autowired private JavaMailSender mailSender; @Value("${mail.fromMail.addr}") private String from; @Override public void sendSimpleMail(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); System.out.println("success"); }catch (Exception e){ System.out.println("fail"+e); } } @Override public void sendHtmlMail(String to, String subject, String content) { MimeMessage message = mailSender.createMimeMessage(); try { MimeMessageHelper helper = new MimeMessageHelper(message, true); //true表示需要创建一个multipart message helper.setFrom(from); helper.setTo(to); helper.setSubject(subject); helper.setText(content, true); mailSender.send(message); System.out.println("html邮件发送成功"); } catch (MessagingException e) { System.out.println("发送html邮件时发生异常！"+e); } } @Override public void sendAttachmentMail(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); //helper.addAttachment("test"+fileName, file); mailSender.send(message); System.out.println("带附件的邮件已经发送。"); } catch (MessagingException e) { System.out.println("发送带附件的邮件时发生异常！"+e); } } }

 5:MailController文件

package com.email.controller; import org.testng.annotations.Test; import com.email.service.MailService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import org.thymeleaf.TemplateEngine; import org.thymeleaf.context.Context; @RestController @RequestMapping("/mail") public class MailController { @Autowired private MailService mailService; @Autowired private TemplateEngine templateEngine; @RequestMapping("/sendSimpleMail") public String sendSimpleMail() { String to = "xxxx@qq.com"; String subject = "test html mail"; String content = "hello, this is html mail！"; mailService.sendSimpleMail(to, subject, content); return "success"; } @RequestMapping("/sendHtmlMail") public String sendHtmlMail() { String to = "xxxx@qq.com"; String subject = "test html mail"; String content = "hello, this is html mail"; mailService.sendHtmlMail(to, subject, content); return "success"; } @Test @RequestMapping("/sendAttachmentsMail") public String sendAttachmentsMail() { String filePath="E:\\11111.txt"; mailService.sendAttachmentMail("xxxx@qq.com", "主题：带附件的邮件", "有附件，请查收！", filePath); return "success"; } @Test @RequestMapping("/sendTemplateMail") public String sendTemplateMail() { //创建邮件正文 Context context = new Context(); context.setVariable("user", "1111"); context.setVariable("web", "tttt"); context.setVariable("company", "我是一个公司"); context.setVariable("product","我是一个产品"); String emailContent = templateEngine.process("emailTemplate", context); mailService.sendHtmlMail("xxxx@qq.com","主题：这是模板邮件",emailContent); return "success"; } }

6：emailTemplate.html文件

<!DOCTYPE html> <html lang="zh" xmlns:th="http://www.thymeleaf.org"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <p th:text="'尊敬的 ' + ${user} + '用户:'"></p> <p th:text=" '恭喜您注册成为'+${web}+'网的用户,同时感谢您对'+${company}+'的关注与支持并欢迎您使用'+${product}+'的产品与服务。'"></p> </body> </html>

 7：比较重要的EmailApplication启动文件

package com.email; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.annotation.ComponentScan; @SpringBootApplication @ComponentScan(basePackages = "com.email.*") public class EmailApplication { public static void main(String[] args) { SpringApplication.run(EmailApplication.class, args); System.out.println("Success"); } }

8:运行EmailApplication右击run。在浏览器输入http://localhost:8080/mail/+对应的方法名即可发送成功。例如：

即可成功。

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扩展：修改项目为邮件内容可编辑，收件人可自我选择

1.新建email类

package com.email.email; public class Email { private String to; private String object; private String content; public String getTo() { return to; } public void setTo(String to) { this.to = to; } public String getObject() { return object; } public void setObject(String object) { this.object = object; } public String getContent() { return content; } public void setContent(String content) { this.content = content; } @Override public String toString() { return "Email{" + "to='" + to + '\'' + ", object='" + object + '\'' + ", content='" + content + '\'' + '}'; } }

 2.新建一个方法

@ResponseBody @RequestMapping("/sendSimpleMail") public String sendSimpleMail(@RequestBody Email email) { mailService.sendSimpleMail(email.getTo(),email.getObject(),email.getContent()); return "success"; }

3.在templates文件中新建html文件 

<!DOCTYPE html> <html lang="en" xmlns:th="http://www.w3.org/1999/xhtml"> <head> <meta charset="UTF-8"/> <title>第一个HTML页面</title> <script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js"></script> </head> <body> <h1>Hello Spring Boot!!!</h1> <p th:text="${hello}"></p> 收件人：<input type="text" id="shou"> <br> 标题：<input type="text" id="title"> <br> 内容：<input type="text" id="content"> <br> 附件：<input type="file" id="file"> <br> <button id="b1">发送</button> </body> <script> $(document).ready(function(){ $("#b1").click(function(){ $.ajax({ type:"post", url:"/mail/sendSimpleMail", dataType : "json", data:JSON.stringify({ to :$("#shou").val(), object : $("#title").val(), content : $("#content").val() }), contentType: "application/json", success : function () { $("input[name='test']").val("").focus(); } }) }); }); </script> </html>

 4.注：要在application.properties里配置新的内容。如下：

spring: thymeleaf: prefix: classpath:/templates/

 5：注：在html页面中使用ajax时，data数据要JSON.Stringify（），不然会报错，如下：

6:附件部分获取不到文件地址，如有大佬，看到请指教怎么获取到file的地址。感谢！！！ 

注：参考https://blog.csdn.net/ZZ2713634772/article/details/79576930