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springboot之注册发送邮件

具体使用

以前使用JavaMail实现邮件发送，但是使用比较繁琐，容易出错，为此spring为我们封装了下，通过使用javamailsender简化了我们的操作，springboot则是 Spring 的一套快速配置脚手架，对spring进行了封装，这里我就使用springboot集成邮件注册。

pom依赖添加

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-mail</artifactId>
</dependency>
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邮件工具类

package com.lytw13.demo.util;

import javax.mail.internet.MimeMessage;


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.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Component;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;
import org.thymeleaf.context.EngineContext;
import org.thymeleaf.context.IContext;

import java.io.File;
import java.util.List;

@Component
public class MailUtil {
   private static String from;
   private static String subject;
   private static String text;
   private static JavaMailSender sender;
   private static TemplateEngine templateEngine;

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"{spring.mail.username}")
   private  void setFrom(String from) {
       MailUtil.from = from;
   }
   @Value(value = "¨E123Espring.mail.username¨E125E")privatevoidsetFrom(Stringfrom)¨E123EMailUtil.from¨E61Efrom;¨E125E@Value(value¨E61E"{spring.mail.subject}")
   private  void setSubject(String subject) {
       MailUtil.subject = subject;
   }
   @Value(value = "${spring.mail.text}")
   private  void setText(String text) {
       MailUtil.text = text;
   }
   @Autowired
   private void setJavaMailSender(JavaMailSender javaMailSender){
       MailUtil.sender = javaMailSender;
   }
   @Autowired
   private void setTemplateEngine(TemplateEngine templateEngine) {
       MailUtil.templateEngine = templateEngine;
   }
   private static Logger logger = LoggerFactory.getLogger(MailUtil.class);

   public static void sendSimpleMail(String to) {
       try {
           SimpleMailMessage simpleMailMessage = new SimpleMailMessage();
           simpleMailMessage.setFrom(from);
           simpleMailMessage.setTo(to);
           simpleMailMessage.setSubject(subject);
           simpleMailMessage.setText(text);
           sender.send(simpleMailMessage);
           logger.info("发送邮件成功！");
       }catch(Exception e) {
           logger.error("发送邮件出现错误！",e);
       }
   }
   public static void sendHtmlMail(String to,String content, List<String> attachFileList) {
       try {
           MimeMessage mimeMessage = sender.createMimeMessage();
           MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMessage,true);
           mimeMessageHelper.setFrom(from);
           mimeMessageHelper.setTo(to);
           mimeMessageHelper.setSubject(subject);
           mimeMessageHelper.setText(content,true);
           if(attachFileList != null && attachFileList.size() > 0) {
               for (String filePath:attachFileList
                    ) {
                   File file = new File(filePath);
                   String fileName = filePath.substring(filePath.lastIndexOf("//")+1);
                   mimeMessageHelper.addAttachment(fileName,file);
               }
           }
           sender.send(mimeMessage);
           logger.info("发送邮件成功！");
       } catch (Exception e) {
           logger.error("发送邮件出现错误！",e);
       }
   }

   public static void sendHtmlTemplateMail(String to, String name, List<String> attachFileList) {
       try {
           MimeMessage mimeMessage = sender.createMimeMessage();
           MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMessage,true);
           mimeMessageHelper.setFrom(from);
           mimeMessageHelper.setTo(to);
           mimeMessageHelper.setSubject(subject);
           //存放变量
           Context context = new Context();
           context.setVariable("name", name);
           String template = templateEngine.process("mailTemplate", context);
           mimeMessageHelper.setText(template,true);
           if(attachFileList != null && attachFileList.size() > 0) {
               for (String filePath:attachFileList
               ) {
                   File file = new File(filePath);
                   String fileName = filePath.substring(filePath.lastIndexOf("//")+1);
                   mimeMessageHelper.addAttachment(fileName,file);
               }
           }
           sender.send(mimeMessage);
           logger.info("发送邮件成功！");
       } catch (Exception e) {
           logger.error("发送邮件出现错误！",e);
       }
   }
}
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上面我写了3个方法，sendSimpleMail只能发送简单邮件，不能添加附件，sendHtmlMail方法能添加附件，并支持发送HTML邮件内容，最后一个方法则是支持使用HTML模板发送邮件，支持附件。日常生活中，我们可能有时候会收到类似这样的邮件：

尊敬的用户xxxxx,您好！欢迎您加入lytw13网站！
  您的lytw13账号已经成功创建，请点击这里激活账号。
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可以看到我们上面的只有注册者名字会变化，这时候我们直接定义一个模板，然后为里面设置用户名即可。前两种方法比较简单，而且实际中相对较少，所以下面我就以模板方式发送邮件。

application.yml配置文件

server:
 port: 8080
spring:
 mail:
   host: smtp.163.com  //邮件服务器地址
   username: lytw1315@163.com 
   password: lllllll  
   subject: "欢迎注册！"
   text: "欢迎注册lytw13's blog！"
 datasource:
   username: root
   password: 123456
   driver-class-name: com.mysql.cj.jdbc.Driver
   url: jdbc:mysql://localhost:3306/db_demo_sys?serverTimezone=Asia/Shanghai
mybatis:
 mapper-locations: classpath:mapper/*.xml
 config-location: classpath:mybatis/mybatis.xml
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controller

@RestController
@RequestMapping("user")
public class UserController {
   @Autowired
   UserService userService;

   @PostMapping("save")
   public String save(@RequestBody TbUser user) {
       userService.save(user);
       return "success";
   }
}
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service

package com.lytw13.demo.service.impl;

import com.lytw13.demo.dao.UserMapper;
import com.lytw13.demo.model.TbUser;
import com.lytw13.demo.service.UserService;
import com.lytw13.demo.util.MailUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;

@Service
public class UserServiceImpl implements UserService {
   @Autowired
   UserMapper userMapper;
   @Override
   public void save(TbUser user) {
       long startTime = System.currentTimeMillis();
       userMapper.insert(user);
       List<String> fileList = new ArrayList<>();
       fileList.add("E://others//MyBlog//新建文本文档1.txt");
       fileList.add("E://others//MyBlog//新建文本文档.txt");
       MailUtil.sendHtmlTemplateMail(user.getEmail(),user.getName(),fileList);
       long endTime = System.currentTimeMillis();
       System.out.println("耗时："+(endTime-startTime));
   }
}
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dao和mapper就不粘贴了。

邮件模板

这里我使用的是thymeleaf，上面封装解析模板的也是用的thymeleaf专有的方法，使用freemarker还得自己修改下上面的方法。

I. pom依赖

     <dependency>
        <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-thymeleaf</artifactId>
 </dependency>
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II. HTML邮件模板

 <!DOCTYPE html>
 <html xmlns:th="http://www.thymeleaf.org">
 <head>
 <meta charset="UTF-8">
 <title>Insert title here</title>
 </head>
 <body>
     <div>
         尊敬的用户<span th:text="${name}"></span>,您好！欢迎您加入lytw13网站！
     <br>
         您的lytw13账号已经成功创建，请点击<a th:href="@{localhost:8080/user/activeUser(name=${name},ustatus=1)}">这里</a>激活账号。

     </div>
 </body>
 </html>
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