Spring Mail常见问题分析和解决办法

2019-11-08 02:59:37

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背景说明

JDK自带的Mail类库封装的简直就是一坨屎（大家不要骂我），用起来怎么看怎么变扭，所以一开始我就想到了SPRing Mail这个优雅的封装集成类库。下面就说说，我使用Spring Mail遇到的几个问题。

核心代码

public void sendMail(List<String> tos, List<String> ccs, String subject, String centent, List<File> attachments){ javaMailSenderImpl sender = new JavaMailSenderImpl(); sender.setHost(host); sender.setProtocol("smtp"); //默认是smtp【smtps协议端口465 smtp协议端口25】 sender.setPort(Integer.parseInt(port)); sender.setUsername(username); sender.setPassWord(password); Properties mail = System.getProperties(); mail.put("mail.smtp.auth", "true"); sender.setJavaMailProperties(mail); MimeMessage message = sender.createMimeMessage(); MimeMessageHelper helper = new MimeMessageHelper(message); try { helper.setSubject(subject); helper.setFrom(username); helper.setTo(tos.toArray(new String[]{})); if(CollectionUtils.isEmpty(bccs)){ helper.setCc(bccs.toArray(new String[]{})); } helper.setText(centent); if(!CollectionUtils.isEmpty(attachments)){ for(File file: attachments){ if(file.exists() && file.isFile()){ FileSystemResource fsr = new FileSystemResource(file); helper.addAttachment(file.getName(), fsr); } else{ log.warn("file: {} is not exists or directory.", file.getPath()); } } } sender.send(message); } catch (MessagingException e) { log.error(e.getMessage(), e); // 养成一个好习惯，把捕获异常包装为运行时异常，方便调用者 throw new RuntimeException(e.getMessage(), e); }}

问题一（邮箱发件人设置）

com.sun.mail.smtp.SMTPSendFailedException: 500 Error: bad syntax

Exception in thread "main" org.springframework.mail.MailSendException: Failed messages: com.sun.mail.smtp.SMTPSendFailedException: 500 Error: bad syntax; message exception details (1) are:Failed message 1:com.sun.mail.smtp.SMTPSendFailedException: 500 Error: bad syntax at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:1388) at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:959) at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:583) at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:433) at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:345) at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:340)

由于平时工作使用邮件不多，一开始遇到这个问题，没看懂这个错误是什么意识，也是弄了好久。最后用蓝灯神器搜到了跟我这个异常差不多的文章。 http://stackoverflow.com/questions/38889504/smtp-protocol-500-error-bad-syntax

总结我没有加上helper.setFrom(username); 这段代码。刚开始我以为 sender.setUsername(username);这段代码就是设置了邮件的发送人，可实际上不是的。

问题二（权限认证设置）

com.sun.mail.smtp.SMTPSendFailedException: 553 authentication is required

Exception in thread "main" org.springframework.mail.MailSendException: Failed messages: com.sun.mail.smtp.SMTPSendFailedException: 553 authentication is required; message exception details (1) are:Failed message 1:com.sun.mail.smtp.SMTPSendFailedException: 553 authentication is required at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:1388) at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:959) at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:583) at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:433) at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:345) at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:340)

这个错误相对于第一个错误来说，还是比较容易懂（认证的问题）。刚开始我以为是邮箱的账号和密码设置有问题，在Foxmail中验证了一下没问题，就排除了这个原因。最后只能开启搜索模式啦！ http://www.cnblogs.com/liuling/archive/2013/03/25/asdfasdf.html

总结少写了下面这段代码，我估计默认这个mail.smtp.auth属性值是false吧！Properties mail = System.getProperties();mail.put("mail.smtp.auth", "true");sender.setJavaMailProperties(mail);

问题三（协议端口设置）

javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection

Exception in thread "main" org.springframework.mail.MailSendException: Mail server connection failed; nested exception is javax.mail.MessagingException: Exception reading response; nested exception is: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?. Failed messages: javax.mail.MessagingException: Exception reading response; nested exception is: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?; message exception details (1) are:Failed message 1:javax.mail.MessagingException: Exception reading response; nested exception is: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection? at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:1462) at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1260) at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:370) at javax.mail.Service.connect(Service.java:275) at org.springframework.mail.javamail.JavaMailSenderImpl.connectTransport(JavaMailSenderImpl.java:486) at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:406) at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:345) at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:340)

大概意识是，你使用了ssl安全连接协议，但是传输的数据是明文。

sender.setProtocol("smtps"); //默认是smtp【smtps协议端口465 smtp协议端口25】sender.setPort(25);总结 Spring Mail默认使用的是smtp协议，也就是说，如果你不设置邮件协议，端口只能设置为25。如果您不是太清楚邮件的设置，可以参考foxmail 这里写图片描述