java发送邮件功能,以发送qq邮件为例

本文仅供参考,转载请注明出处,谢谢
我的开源中国博客地址:https://my.oschina.net/u/2486137/blog/1513638

问题①: java发送qq邮件出现如下错误的解决方法:
   503 Error: need EHLO and AUTH first !

pop.put("mail.smtp.auth", "true");//注意value值不能不设置,并且不能是Boolean类型,应为字符串,否则会报如上所示错误

问题②: Could not connect to SMTP host: smtp.qq.com, port: 465, response: -1

原因:  465端口是为SMTPS（SMTP-over-SSL）协议服务开放的，这是
SMTP协议基于SSL安全协议之上的一种变种协议.
解决方法: 配置文件需要加上如下代码即可解决.

pop.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");

附上所有的代码:

配置文件:
说明: 配置文件采用的是yml文件,跟properties相比,优点是结构化清晰,少写很多代码

> mail:
    mailhost: smtp.qq.com
    mailport: 465
    user: 邮箱用户名
    password: 密码(qq为授权码)
    mailFrom: [e-mail] #发送者的邮箱,
    mailTo: [e-mail],[e-mail],[e-mail] #接收者的邮箱,群发请以逗号隔开
    properties:
      mail:
        smtp:
          auth: true
          mailtimeout: 1000
          mailssl: javax.net.ssl.SSLSocketFactory
          starttls: 
             enable: true
             required: true

> 
> java代码:`
`   @Value("${mailhost}")
    private String host;
    @Value("${mailport}")
    private Integer port;
    @Value("${user}")
    private String username;

    @Value("${password}")
    private String password;
    @Value("${mailFrom}")
    private String from;

    @Value("${mailTo}")
    private String [] to;

    @Value("${auth}")
    private String auth;

    @Value("${enable}")
    private Boolean enable;

    @Value("${required}")
    private Boolean required;

    @Value("${mailtimeout}")
    private Integer timeout;

    @Value("${mailssl}")
    private String ssl;
    public void onApplicationEvent(ApplicationEvent event) {
        System.out.println("email cfg....");
        System.out.println("print:"+this.toString());
        //创建一个发送者对象
        JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
        mailSender.setHost(this.host);
        mailSender.setPort(this.port);
        mailSender.setUsername(this.username);
        mailSender.setPassword(this.password);
        // 加认证机制
        Properties pop = new Properties();
        pop.put("mail.smtp.host", this.host);
//      pop.put("mail.smtp.port", this.port);//已经在上面加过
        pop.put("mail.smtp.auth", this.auth);//必须是字符串而不能是boolean否则报错
        pop.put("mail.smtp.starttls.enable", this.enable);
        pop.put("mail.smtp.timeout", this.timeout);
        pop.put("mail.smtp.socketFactory.class", this.ssl);
        mailSender.setJavaMailProperties(pop);

        //组织邮件参数并执行发送
        SimpleMailMessage message = new SimpleMailMessage();
        message.setFrom(this.from);
        message.setTo(this.to);
        message.setSubject("主题：测试,spring boot发送邮件.");
        message.setText("测 试\n 邮件为程序发送,是否收到?请回答");
        mailSender.send(message);
        System.out.println("send end....");
    }
    @Override
    public String toString() {
        return "EmailConfiguration [host=" + host + ", port=" + port + ", username=" + username
                + ", password=" + password + ", from=" + from + ", to=" + to + ", auth=" + auth
                + ", enable=" + enable + ", required=" + required + ", timeout=" + timeout + "]";
    }