Spring Mail常見問題分析和解決辦法

2019-11-08 02:59:37

字體：大中小

來源：轉載

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背景說明

JDK自帶的Mail類庫封裝的簡直就是一坨屎（大家不要罵我），用起來怎么看怎么變扭，所以一開始我就想到了SPRing Mail這個優雅的封裝集成類庫。下面就說說，我使用Spring Mail遇到的幾個問題。

核心代碼

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"); //默認是smtp【smtps協議端口465 smtp協議端口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); // 養成一個好習慣，把捕獲異常包裝為運行時異常，方便調用者 throw new RuntimeException(e.getMessage(), e); }}

問題一（郵箱發件人設置）

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)

由于平時工作使用郵件不多，一開始遇到這個問題，沒看懂這個錯誤是什么意識，也是弄了好久。最后用藍燈神器搜到了跟我這個異常差不多的文章。 http://stackoverflow.com/questions/38889504/smtp-protocol-500-error-bad-syntax

總結我沒有加上helper.setFrom(username); 這段代碼。剛開始我以為 sender.setUsername(username);這段代碼就是設置了郵件的發送人，可實際上不是的。

問題二（權限認證設置）

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)

這個錯誤相對于第一個錯誤來說，還是比較容易懂（認證的問題）。剛開始我以為是郵箱的賬號和密碼設置有問題，在Foxmail中驗證了一下沒問題，就排除了這個原因。最后只能開啟搜索模式啦！ http://www.cnblogs.com/liuling/archive/2013/03/25/asdfasdf.html

總結少寫了下面這段代碼，我估計默認這個mail.smtp.auth屬性值是false吧！Properties mail = System.getProperties();mail.put("mail.smtp.auth", "true");sender.setJavaMailProperties(mail);

問題三（協議端口設置）

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)

大概意識是，你使用了ssl安全連接協議，但是傳輸的數據是明文。

sender.setProtocol("smtps"); //默認是smtp【smtps協議端口465 smtp協議端口25】sender.setPort(25);總結 Spring Mail默認使用的是smtp協議，也就是說，如果你不設置郵件協議，端口只能設置為25。如果您不是太清楚郵件的設置，可以參考foxmail 這里寫圖片描述