这是我参与8月更文挑战的第4天，活动详情查看：8月更文挑战

问题描述

DEBUG: JavaMail version 1.6.1
DEBUG: successfully loaded resource: /META-INF/javamail.default.providers
DEBUG: Tables of loaded providers
DEBUG: Providers Listed By Class Name: {com.sun.mail.smtp.SMTPSSLTransport=javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Oracle], com.sun.mail.smtp.SMTPTransport=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle], com.sun.mail.imap.IMAPSSLStore=javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Oracle], com.sun.mail.pop3.POP3SSLStore=javax.mail.Provider[STORE,pop3s,com.sun.mail.pop3.POP3SSLStore,Oracle], com.sun.mail.imap.IMAPStore=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Oracle], com.sun.mail.pop3.POP3Store=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Oracle]}
DEBUG: Providers Listed By Protocol: {imaps=javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Oracle], imap=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Oracle], smtps=javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Oracle], pop3=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Oracle], pop3s=javax.mail.Provider[STORE,pop3s,com.sun.mail.pop3.POP3SSLStore,Oracle], smtp=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]}
DEBUG: successfully loaded resource: /META-INF/javamail.default.address.map
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]
DEBUG SMTP: useEhlo true, useAuth false
DEBUG SMTP: trying to connect to host "smtp.163.com", port 465, isSSL false
DEBUG SMTP: EOF: [EOF]
DEBUG SMTP: could not connect to host "smtp.163.com", port: 465, response: -1
2021-06-02 16:35:42.323 ERROR 11141 --- [nio-8999-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.mail.MailSendException: Mail server connection failed; nested exception is javax.mail.MessagingException: Could not connect to SMTP host: smtp.163.com, port: 465, response: -1. Failed messages: javax.mail.MessagingException: Could not connect to SMTP host: smtp.163.com, port: 465, response: -1; message exceptions (1) are:
Failed message 1: javax.mail.MessagingException: Could not connect to SMTP host: smtp.163.com, port: 465, response: -1] with root cause

javax.mail.MessagingException: Could not connect to SMTP host: smtp.163.com, port: 465, response: -1
	at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2197) ~[javax.mail-1.6.1.jar:1.6.1]
	at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:740) ~[javax.mail-1.6.1.jar:1.6.1]
	at javax.mail.Service.connect(Service.java:366) ~[javax.mail-1.6.1.jar:1.6.1]
	at org.springframework.mail.javamail.JavaMailSenderImpl.connectTransport(JavaMailSenderImpl.java:515) ~[spring-context-support-5.0.8.RELEASE.jar:5.0.8.RELEASE]
	at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:435) ~[spring-context-support-5.0.8.RELEASE.jar:5.0.8.RELEASE]
	at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:321) ~[spring-context-support-5.0.8.RELEASE.jar:5.0.8.RELEASE]

项目配置

spring:
  mail:
    # 配置 SMTP 服务器地址
    host: smtp.163.com
    # 发送者邮箱
    username: cocoococ@163.com
    # 配置密码，注意不是真正的密码，而是刚刚申请到的授权码
    password: ajhdasdkaklsjdl
    # 端口号465或587
    port: 465
    # 默认的邮件编码为UTF-8
    default-encoding: UTF-8
    # 配置SSL 加密工厂
    properties:
      mail:
        smtp:
          socketFactoryClass: javax.net.ssl.SSLSocketFactory
        #表示开启 DEBUG 模式，这样，邮件发送过程的日志会在控制台打印出来，方便排查错误
        debug: true

发送代码

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.Date;

@RestController
@RequestMapping("test")
public class TestController {

    @Autowired
    JavaMailSender javaMailSender;

    @GetMapping("sendMail")
    public void sendMail(){
        SimpleMailMessage message = new SimpleMailMessage();
        // 设置邮件主题
        message.setSubject("这是一封测试邮件");
        // 设置邮件发送者，这个跟application.yml中设置的要一致
        message.setFrom("cocoococ@163.com");
        // 设置邮件接收者，可以有多个接收者，中间用逗号隔开，以下类似
        // message.setTo("10*****16@qq.com","12****32*qq.com");
        message.setTo("222qwioqin@qq.com");
        // 设置邮件发送日期
        message.setSentDate(new Date());
        // 设置邮件的正文
        message.setText("这是测试邮件的正文");

        javaMailSender.send(message);

    }

}

问题调试

可疑点在于上面红线位置

• 我明明设置了账号、授权码登录，但是useAuth还是false
• isSsl 也是false

从报错堆栈中找到 com.sun.mail.smtp.SMTPTransport#protocolConnect

就是说 useAuth 其实是从属性中解析的，这里的name代表协议类型（smtp、pop3） 那么完整的属性名应该是 mail.smtp.auth

接着 com.sun.mail.smtp.SMTPTransport#openServer(java.lang.String, int) 这里的isSSL是成员属性

根据调试只有在构造函数中才会赋值 com.sun.mail.smtp.SMTPTransport#SMTPTransport(javax.mail.Session, javax.mail.URLName, java.lang.String, boolean) 那么完整的属性名应该是 mail.smtp.ssl.enable 所以只要修改yml文件即可

解决方案

	
spring:
  mail:
    # 配置 SMTP 服务器地址
    host: smtp.163.com
    # 发送者邮箱
    username: cocoococ@163.com
    # 配置密码，注意不是真正的密码，而是刚刚申请到的授权码
    password: ajhdasdkaklsjdl
    # 端口号465或587
    port: 465
    # 默认的邮件编码为UTF-8
    default-encoding: UTF-8
    # 配置SSL 加密工厂
    properties:
      mail:
        smtp:
          starttls:
            enable: true
          auth: true
          ssl:
            enable: true
          socketFactoryClass: javax.net.ssl.SSLSocketFactory
        #表示开启 DEBUG 模式，这样，邮件发送过程的日志会在控制台打印出来，方便排查错误
        debug: true
server:
  port: 8999
  servlet:
    path: /mall