第一步

首先登录你的邮箱，进入页面，点击设置->账户

 
讯享网

 点击管理账户

生成授权码

发送短信，这样你就拿到了属于你邮箱的授权码了。

接下来，导入我们的整合依赖JMail。

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

resources下的配置文件application.properties

讯享网#配置邮件服务器的地址
spring.mail.host=smtp..com
#发送邮件人的邮箱
spring.mail.username=你的邮箱
#邮箱设置里SMTP服务生成的授权码
spring.mail.password=授权码
#SSL连接配置
spring.mail.properties.mail.smtp.ssl.enable=true
#配置默认编码
spring.mail.default-encoding=utf-8

spring.thymeleaf.encoding=utf-8
spring.thymeleaf.mode=HTML5
spring.thymeleaf.prefix=classpath:/templates/
spring.thymeleaf.suffix=.html
spring.thymeleaf.cache=true

在项目下创建domain包，创建一个用于封装邮箱的实体类MailDO

package com.example.exe5.domain; import java.util.Map; public class MailDO { // 标题 private String title; // 内容 private String content; // 接收人邮件地址 private String email; // 附加，value文件的绝对地址/动态模板数据 private Map<String,Object> attachment; public MailDO() { } public MailDO(String title, String content, String email, Map<String, Object> attachment) { this.title = title; this.content = content; this.email = email; this.attachment = attachment; } public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } public String getContent() { return content; } public void setContent(String content) { this.content = content; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public Map<String, Object> getAttachment() { return attachment; } public void setAttachment(Map<String, Object> attachment) { this.attachment = attachment; } } 

在项目下创建Service包，创建一个MailService用来封装Mail的业务层逻辑

讯享网package com.example.exe5.service; import com.example.exe5.domain.MailDO; import org.omg.CORBA.SystemException; import org.springframework.mail.javamail.MimeMessageHelper; public interface MailService { void sendTextMail(MailDO mailDO) throws SystemException; void sendHtmlMail(MailDO mailDO,boolean isShowHtml); void sendTemplateMail(MailDO mailDO); // 发送附件 void sendComplexEmail(MailDO mailDO,String filePath,String rscId,String rscPath); } 

在项目的Service包中，继续创建一个Impl包，创建一个MailServiceImpl类对业务接口进行实现

package com.example.exe5.service.impl; import com.example.exe5.domain.MailDO; import com.example.exe5.service.MailService; import org.omg.CORBA.SystemException; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Value; import org.springframework.core.io.FileSystemResource; import org.springframework.mail.MailException; import org.springframework.mail.SimpleMailMessage; import org.springframework.mail.javamail.JavaMailSender; import org.springframework.mail.javamail.MimeMessageHelper; import org.springframework.scheduling.annotation.Async; import org.springframework.stereotype.Service; import org.thymeleaf.TemplateEngine; import org.thymeleaf.standard.expression.MessageExpression; import javax.mail.MessagingException; import javax.mail.internet.MimeMessage; import java.io.File; @Service public class MailServiceImpl implements MailService { private final static Logger log = LoggerFactory.getLogger(MailServiceImpl.class); @Autowired private TemplateEngine templateEngine; @Autowired private JavaMailSender javaMailSender; @Value("${spring.mail.username}") private String from; @Async @Override public void sendTextMail(MailDO mail) throws SystemException { // 建立邮件消息 SimpleMailMessage message = new SimpleMailMessage(); message.setFrom(from); message.setSubject(mail.getTitle()); message.setTo(mail.getEmail()); message.setText(mail.getContent()); try { javaMailSender.send(message); }catch (MailException e){ log.error("纯文本邮件发送失败->message:{}",e.getMessage()); System.out.println("邮件发送失败"); } } @Override public void sendHtmlMail(MailDO mailDO, boolean isShowHtml) { try{ MimeMessage mimeMessage = javaMailSender.createMimeMessage(); MimeMessageHelper messageHelper = new MimeMessageHelper(mimeMessage,true); messageHelper.setFrom(from); messageHelper.setTo(mailDO.getEmail()); messageHelper.setSubject(mailDO.getTitle()); messageHelper.setText(mailDO.getContent(),isShowHtml); // 判断是否有附加图片等 if(mailDO.getAttachment()!=null&&mailDO.getAttachment().size()>0){ mailDO.getAttachment().entrySet().stream().forEach(entrySet->{ try{ File file = new File(String.valueOf(entrySet.getValue())); if(file.exists()){ messageHelper.addAttachment(entrySet.getKey(),new FileSystemResource(file)); } }catch (MessagingException e){ log.error("附件发送失败->message:{}",e.getMessage()); System.out.println("附件发送失败"); } }); } //发送 javaMailSender.send(mimeMessage); }catch (MessagingException e){ log.error("富文本邮件发送失败->message:{}",e.getMessage()); System.out.println("附件发送失败"); } } @Override public void sendTemplateMail(MailDO mailDO) { } @Override public void sendComplexEmail(MailDO mailDO,String filePath, String rscId, String rscPath) { MimeMessage message = javaMailSender.createMimeMessage(); try{ MimeMessageHelper helper = new MimeMessageHelper(message,true); helper.setFrom(from); helper.setTo(mailDO.getEmail()); helper.setSubject(mailDO.getTitle()); helper.setText(mailDO.getContent(),true); // 设置邮件静态资源 FileSystemResource res = new FileSystemResource(new File(rscPath)); helper.addInline(rscId,res); // 设置邮件附件 FileSystemResource file = new FileSystemResource(new File(filePath)); String fileName = filePath.substring(filePath.lastIndexOf(File.separator)); helper.addAttachment(fileName,file); // 发送邮件 javaMailSender.send(message); System.out.println("复杂邮件发送成功"); }catch (MessagingException e){ System.out.println("复杂邮件发送失败"); e.printStackTrace(); } } } 

在项目下创建controller包，创建一个MailController控制器类

讯享网package com.example.exe5.controller;

import com.example.exe5.domain.MailDO;
import com.example.exe5.service.MailService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;

@Controller
public class MailOperation {
    private MailDO mailDO;

    @Autowired
    private MailService mailService;

    @GetMapping("/toSendMail")
    public String toSendMail(){
        return "sendmail";
    }
    @RequestMapping("/sendMail")
    public String sendMail(HttpServletRequest request){
        String title = request.getParameter("title");
        String to = request.getParameter("to");
        String content = request.getParameter("content");
        mailDO = new MailDO(title,content,to,null);
        mailService.sendTextMail(mailDO);
        return "redirect:/toSendMail";
    }
    @RequestMapping("/sendComplexMail")
    public String sendComplexMail(HttpServletRequest request){
        String title = "复杂附件测试";
        String to = "1048001021@.com";
        StringBuilder text = new StringBuilder();
        text.append("<html><head></head>");
        text.append("<body><h1>复杂附件</h1>");
        String rscId = "img001";
        text.append("<img src='cid:"+rscId+"'/></body></html>");
        String rscPath = "E:\\files\\复杂img.jpg";
        String filePath = "E:\\复杂附件测试.txt";
//        发送复杂邮件
        mailDO = new MailDO(title,text.toString(),to,null);
        mailService.sendComplexEmail(mailDO,filePath,rscId,rscPath);
        return "redirect:/toSendMail";
    }

}

到最后，启动项目的主启动类，这样你的邮箱就收到了消息。

如果你学习到这里，并没有成功运行，可以私信我寻求帮助哦！