spring boot学习第十一篇:发邮件

1、pom.xml文件内容如下（是我所有学习内容需要的，不再单独分出来，包不会冲突）：

    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.6.4
         
    
    com.hm-email
    hm-email
    0.0.1-SNAPSHOT
    hm-email
    hm-email
    
        8
        1.2.8
        1.16
        7.9.2
    
    
        
        
            com.alibaba
            druid-spring-boot-starter
            ${druid.version}
        

        
            org.springframework.boot
            spring-boot-starter
        

        
            org.springframework.boot
            spring-boot-starter-test
            test
        

        
        
            com.baomidou
            mybatis-plus-boot-starter
            3.5.3.1
        

        
            org.springframework.boot
            spring-boot-starter-web
        

        
            org.springframework.boot
            spring-boot-starter-test
        

        
            org.projectlombok
            lombok
            true
        

        
        
            mysql
            mysql-connector-java
            runtime
        

        
        
            org.projectlombok
            lombok
            true
        

        
        
            org.bgee.log4jdbc-log4j2
            log4jdbc-log4j2-jdbc4.1
            ${log4jdbc.version}
        

        
            com.alibaba
            fastjson
            1.2.9
        

        
            redis.clients
            jedis
        

        
            org.apache.kafka
            kafka-clients

        

        
            org.springframework.kafka
            spring-kafka

        

        
        
            org.elasticsearch.client
            elasticsearch-rest-high-level-client
            ${es.version}
            
                
                    org.elasticsearch
                    elasticsearch
                
                
                    org.elasticsearch.client
                    elasticsearch-rest-client
                
            
        

        
        
            org.elasticsearch
            elasticsearch
            ${es.version}
        
        
            org.elasticsearch.client
            elasticsearch-rest-client
            ${es.version}
        
        
            junit
            junit
        

        
            org.springframework.boot
            spring-boot-starter-data-mongodb
        

        
            org.springframework.boot
            spring-boot-starter-security
        

        
            org.springframework.security.oauth.boot
            spring-security-oauth2-autoconfigure
            2.4.0
        

        
            org.springframework.boot
            spring-boot-starter-mail
        

    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

2、application.yml内容如下：

server:
  port: 8081
  servlet.context-path: /

#配置数据源
spring:
  datasource:
    druid:
      db-type: com.alibaba.druid.pool.DruidDataSource
      driverClassName: net.sf.log4jdbc.sql.jdbcapi.DriverSpy
      url: jdbc:log4jdbc:mysql://${DB_HOST:localhost}:${DB_PORT:3306}/${DB_NAME:eladmin}?serverTimezone=Asia/Shanghai&characterEncoding=utf8&useSSL=false
      username: ${DB_USER:root}
      password: ${DB_PWD:123456}
  redis:
    host: localhost
    port: 6379
    password: heming
    database: 10
  data:
    mongodb:
      host: 43.138.0.199
      port: 27017
      username: hmblogs
      password: Woaihm13141314!
      database: hmblogs
      authentication-database: admin
  mail:
    host: smtp.163.com # smtp地址，开通的时候会显示
    username: [email protected] # 你的邮箱账号
    password: FFJEPDMVMOPCOKAH # 你的邮箱授权码
    properties:
      mail:
        smtp:
          auth: true
          starttls:
            enable: true
    protocol: smtp

es:
  host: 43.138.0.199
  port: 9200
  scheme: http
  user: elastic
  password: Woaihm13141314!

3、BackendApplication内容如下：

package com.hmblogs.backend;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class BackendApplication {

    public static void main(String[] args) {
        SpringApplication.run(BackendApplication.class, args);
    }

}

4、EmailService文件内容如下：

package com.hmblogs.backend.service;

import lombok.extern.slf4j.Slf4j;
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.Service;

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import java.io.File;

@Service
@Slf4j
public class EmailService {

    @Autowired
    private JavaMailSender mailSender;

    @Value("${spring.mail.username}")
    private String username;

    /**
     * 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
     */
    public  void sendSimpleMail(String to, String subject, String content, String... cc) {
        SimpleMailMessage message = new SimpleMailMessage();
        message.setFrom(username);
        message.setTo(to);
        message.setSubject(subject);
        message.setText(content);
        if (cc!=null) {
            message.setCc(cc);
        }
        mailSender.send(message);
    }

    /**
     * 发送HTML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
     */
    public  void sendHtmlMail(String to, String subject, String content, String... cc) {
        try {
            MimeMessage message = mailSender.createMimeMessage();
            MimeMessageHelper helper = new MimeMessageHelper(message, true,"UTF-8");
            helper.setFrom(username);
            helper.setTo(to);
            helper.setSubject(subject);
            helper.setText(content, true);
            if (cc!=null) {
                helper.setCc(cc);
            }
            mailSender.send(message);
        } catch (MessagingException e) {
            log.error("发送邮件失败,收件人:{}", to, e);
        }
    }

    /**
     * 发送带附件的邮件
     *
     * @param to       收件人地址
     * @param subject  邮件主题
     * @param content  邮件内容
     * @param filePath 附件地址
     * @param cc       抄送地址
     */
    public  void sendAttachmentsMail(String to, String subject, String content, String filePath, String... cc) {
        try {
            MimeMessage message = mailSender.createMimeMessage();
            MimeMessageHelper helper = new MimeMessageHelper(message, true,"UTF-8");
            helper.setFrom(username);
            helper.setTo(to);
            helper.setSubject(subject);
            helper.setText(content, true);
            if (cc!=null) {
                helper.setCc(cc);
            }
            File file = new File(filePath);
            String fileName = filePath.substring(filePath.lastIndexOf(File.separator));
            helper.addAttachment(fileName, file);
            mailSender.send(message);
        } catch (MessagingException e) {
            log.error("发送邮件失败,收件人:{}", to, e);
        }
    }

    /**
     * 发送正文中有静态资源的邮件
     *
     * @param to      收件人地址
     * @param subject 邮件主题
     * @param content 邮件内容
     * @param rscPath 静态资源地址
     * @param rscId   静态资源id
     * @param cc      抄送地址
     */
    public  void sendResourceMail(String to, String subject, String content, String rscPath, String rscId, String... cc) {
        try {
            MimeMessage message = mailSender.createMimeMessage();
            MimeMessageHelper helper = new MimeMessageHelper(message, true,"UTF-8");
            helper.setFrom(username);
            helper.setTo(to);
            helper.setSubject(subject);
            helper.setText(content, true);
            if (cc!=null) {
                helper.setCc(cc);
            }
            File res = new File(rscPath);
            helper.addInline(rscId, res);
            mailSender.send(message);
        } catch (MessagingException e) {
            log.error("发送邮件失败,收件人:{}", to, e);
        }
    }
}

5、EmailServiceTest测试类内容如下：

package com.hmblogs.backend.util;

import com.hmblogs.backend.BackendApplication;
import com.hmblogs.backend.service.EmailService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import javax.annotation.Resource;

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes={BackendApplication.class, EmailServiceTest.class})
public class EmailServiceTest {

    @Resource
    private EmailService emailService;

    @Test
    public void test(){
        emailService.sendSimpleMail("[email protected]","测试","测试");
    }
}

启动服务，执行该方法，报错如下：

org.springframework.mail.MailSendException: Mail server connection failed; nested exception is javax.mail.MessagingException: Could not convert socket to TLS;
  nested exception is:
	javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target. Failed messages: javax.mail.MessagingException: Could not convert socket to TLS;
  nested exception is:
	javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
; message exception details (1) are:
Failed message 1:
javax.mail.MessagingException: Could not convert socket to TLS;
  nested exception is:
	javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
	at com.sun.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:2140)
	at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:734)
	at javax.mail.Service.connect(Service.java:342)
	at org.springframework.mail.javamail.JavaMailSenderImpl.connectTransport(JavaMailSenderImpl.java:518)
	at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:437)
	at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:323)
	at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:312)
	at com.hmblogs.backend.service.EmailService.sendSimpleMail(EmailService.java:42)
	at com.hmblogs.backend.util.EmailServiceTest.test(EmailServiceTest.java:21)
	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:59)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
	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:366)
	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$4.run(ParentRunner.java:331)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
	at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
	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$3.evaluate(ParentRunner.java:306)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
	at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38)
	at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11)
	at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35)
	at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:232)
	at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:55)
Caused by: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
	at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
	at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1949)
	at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:302)
	at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:296)
	at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1514)
	at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:216)
	at sun.security.ssl.Handshaker.processLoop(Handshaker.java:1026)
	at sun.security.ssl.Handshaker.process_record(Handshaker.java:961)
	at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1062)
	at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1375)
	at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1403)
	at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1387)
	at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:602)
	at com.sun.mail.util.SocketFetcher.startTLS(SocketFetcher.java:529)
	at com.sun.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:2135)
	... 41 more
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
	at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:387)
	at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:292)
	at sun.security.validator.Validator.validate(Validator.java:260)
	at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:324)
	at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:229)
	at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:124)
	at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1496)
	... 51 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
	at sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:141)
	at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:126)
	at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:280)
	at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:382)
	... 57 more