此 demo 主要演示了 Spring Boot 如何整合邮件功能，包括发送简单文本邮件。
邮件服务在开发中非常常见，比如用邮件注册账号、邮件作为找回密码的途径、用于订阅内容定期邮件推送等等，下面就简单的介绍下邮件实现方式。
代码实现1.pom.xml依赖
<dependencies> <!-- Spring Boot 邮件依赖 --> <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>2.application.yml配置
spring: mail: host: smtp.qq.com username: 271657370@qq.com password: #***** //授权码，注意这里不是直接填密码 default-encoding: UTF-8 properties: mail.smtp.auth: true mail.smtp.starttls.enable: true mail.smtp.starttls.required: true mail.smtp.ssl.enable: true mail.display.sendmail: spring-boot-demo注意
spring.mail.username指的是发送邮件的QQ邮箱
spring.mail.password指的是该邮箱的授权码，而不是该邮箱的密码
3.编写简单邮件发送接口
@Service public class MailServiceImpl implements MailService { @Autowired private JavaMailSender mailSender; @Value("${spring.mail.username}") private String from; /** * 发送文本邮件 * * @param to 收件人地址 * @param subject 邮件主题 * @param content 邮件内容 * @param cc 抄送地址 */ @Override public void sendSimpleMail(String to, String subject, String content, String... cc) { SimpleMailMessage message = new SimpleMailMessage(); message.setFrom(from); message.setTo(to); message.setSubject(subject); message.setText(content); message.setCc(cc); mailSender.send(message); } }4.编写测试用例
public class MailServiceTest extends EmailApplicationTests { @Autowired private MailService mailService; /** * 测试简单邮件 */ @Test public void sendSimpleMail() { mailService.sendSimpleMail("smltq@126.com", "这是一封简单邮件", "这是一封普通的SpringBoot测试邮件"); } }运行测试用例,发现成功收到邮件了
可能会遇到的异常 org.springframework.mail.MailAuthenticationException: Authentication failed; nested exception is javax.mail.AuthenticationFailedException: [EOF] at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:440) at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:323) at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:312) at com.easy.email.service.impl.MailServiceImpl.sendSimpleMail(MailServiceImpl.java:35) at com.easy.email.service.MailServiceTest.sendSimpleMail(MailServiceTest.java:16) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74) at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84) at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75) at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86) at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190) at org.junit.runner.JUnitCore.run(JUnitCore.java:137) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68) at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70) Caused by: javax.mail.AuthenticationFailedException: [EOF] at com.sun.mail.smtp.SMTPTransport$Authenticator.authenticate(SMTPTransport.java:965) at com.sun.mail.smtp.SMTPTransport.authenticate(SMTPTransport.java:876) at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:780) at javax.mail.Service.connect(Service.java:366) at org.springframework.mail.javamail.JavaMailSenderImpl.connectTransport(JavaMailSenderImpl.java:518) at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:437) ... 34 more这是因为还没有去邮箱那里设置开启POP3/SMTP服务，操作步骤如下：
邮箱—>设置—>账户，然后拉下来，找到POP3/IMAP/SMTP/Exchange/CardDAV/CalDAV服务
开启服务：POP3/SMTP服务
开启好了POP3/SMTP服务之后，会有一个授权码，这个授权码就是application.yml的spring.mail.password
参考示例代码-github