如何用Spring发送电子邮件
Spring基于javax.mail封装了一套用于发送电子邮件的API，位于org.springframework.mail包下，下面将介绍下发送普通文本邮件和基于thymeleaf模版的邮件。
普通邮件导入javax.mail依赖<!-- ...... --><!-- 省略Spring依赖 --><dependency> <groupId>com.sun.mail</groupId> <artifactId>javax.mail</artifactId> <version>1.6.2</version></dependency>Spring配置类
@PropertySource(value='classpath:mail.properties')@Configurationpublic class SpringConfig {@AutowiredEnvironment environment;/** * Spring邮件配置 */@Beanpublic JavaMailSenderImpl javaMailSenderImpl(){JavaMailSenderImpl javaMailSenderImpl = new JavaMailSenderImpl();javaMailSenderImpl.setHost(environment.getProperty('mail.host'));javaMailSenderImpl.setUsername(environment.getProperty('mail.username'));javaMailSenderImpl.setPassword(environment.getProperty('mail.password'));javaMailSenderImpl.setDefaultEncoding(environment.getProperty('mail.encoding'));return javaMailSenderImpl;}}邮件配置：mail.properties
#QQ邮箱发送邮件服务器mail.host=smtp.qq.com#QQ邮箱账户名mail.username=xxxxxx@qq.com#QQ邮箱授权码，开启IMAP/SMTP服务时会生成mail.password=lrorsapyffcwbegg#邮件发送编码mail.encoding=UTF-8测试
@RunWith(SpringRunner.class)@ContextConfiguration(classes=SpringConfig.class)public class MailTest {@Autowiredprivate JavaMailSenderImpl javaMailSenderImpl;@Testpublic void testSimpleMail() throws MessagingException{MimeMessage message = javaMailSenderImpl.createMimeMessage();//发送带附件和内联元素的邮件需要将第二个参数设置为trueMimeMessageHelper helper = new MimeMessageHelper(message, true);//发送方邮箱，和配置文件中的mail.username要一致helper.setFrom('xxxxxx@qq.com');//接收方helper.setTo('xxxxxx@qq.com');//主题helper.setSubject('邮件测试');//邮件内容helper.setText('<html><body><img src=’cid:myphoto’></body></html>', true);//邮件内容内嵌的图片,addInline中的contentId要和邮件内容中的cid相对应FileSystemResource res = new FileSystemResource(new File('e:/yc/1.jpg'));helper.addInline('myphoto', res);//邮件附件FileSystemResource file = new FileSystemResource(new File('e:/yc/myphoto.zip'));helper.addAttachment('myphoto.zip', file);javaMailSenderImpl.send(message);}}
<dependency> <groupId>org.thymeleaf</groupId> <artifactId>thymeleaf-spring4</artifactId> <version>3.0.11.RELEASE</version></dependency>Spring配置类中添加thymeleaf模板配置
@Bean public TemplateEngine emailTemplateEngine() { SpringTemplateEngine templateEngine = new SpringTemplateEngine(); ClassLoaderTemplateResolver templateResolver = new ClassLoaderTemplateResolver(); templateResolver.setResolvablePatterns(Collections.singleton('*.html')); templateResolver.setPrefix('/templates/'); templateResolver.setSuffix('.html'); templateResolver.setTemplateMode(TemplateMode.HTML); templateResolver.setCharacterEncoding('UTF-8'); templateResolver.setCacheable(false); templateEngine.addTemplateResolver(templateResolver); return templateEngine; }模版文件：/src/main/resources/templates/msg.html
<!DOCTYPE html><html xmlns:th='http://www.thymeleaf.org'> <head> <meta http-equiv='Content-Type' content='text/html; charset=UTF-8' /> <style type='text/css'>span{color:orange}</style> </head> <body> <p> 您好， <span th:text='${name}'>xxx</span>，感谢您使用XXX服务，您正在进行邮箱验证，本次请求的验证码为： </p> <p><span th:text='${validCode}'>1111</span>(为了保障您帐号的安全性，请在1小时内完成验证。)</p> <p> XXX团队<br /> 2019年06月06日 </p> </body></html>测试
@Autowiredprivate TemplateEngine emailTemplateEngine;@Testpublic void testTemplateMail() throws MessagingException{MimeMessage message = javaMailSenderImpl.createMimeMessage();MimeMessageHelper helper = new MimeMessageHelper(message, true);helper.setFrom('xxxxxx@qq.com');helper.setTo('xxxxxx@qq.com');helper.setSubject('邮件测试');//thymeleaf模版解析成StringContext ctx = new Context();ctx.setVariable('name', '小姐姐');ctx.setVariable('validCode', '88888888');String htmlContent = emailTemplateEngine.process('msg.html', ctx);helper.setText(htmlContent, true);javaMailSenderImpl.send(message);}
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