Java 邮件超时和连接超时处理
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Java Mail timeout & connectiontimeout handling
提问by Gnanam
I'm using JavaMail to send email requests to an SMTP server.
我正在使用 JavaMail 向 SMTP 服务器发送电子邮件请求。
I would like to set both "mail.smtp.connectiontimeout"and "mail.smtp.timeout"properties within my code.
我想在我的代码中设置“mail.smtp.connectiontimeout”和“mail.smtp.timeout”属性。
Programmatically, I want to catch both when timeoutand/or connectiontimeoutoperations are reached in Java and handle things accordingly. Handling in the sense, I need to retry the same email once again the next time.
以编程方式，我想在 Java 中达到超时和/或连接超时操作时捕获并相应地处理事情。从某种意义上说，下次我需要再次重试同一封电子邮件。
How do I handle this in Java/JavaMail? Is it possible to catch & handle this timeout operations?
我如何在 Java/JavaMail 中处理这个问题？是否可以捕获并处理此超时操作？
EDIT
编辑
Also, is it possible to simulate/reproduce this timeout operation on my own assuming I've complete administration access to the SMTP server?
另外，假设我对 SMTP 服务器有完整的管理访问权限，是否可以自己模拟/重现此超时操作？
采纳答案by Janning
Answering your second question: On your test machine just DROP all outgoing connections to your SMTP Server with iptables:
回答您的第二个问题：在您的测试机器上，只需使用 iptables DROP 到您的 SMTP 服务器的所有传出连接：
iptables -I OUTPUT 1 -p tcp -s 192.168.1.20 --dport 25 -j DROP
This way it does look like an unresponsive smtp server and you can test your exception handling.
这样它看起来就像一个没有响应的 smtp 服务器，你可以测试你的异常处理。
回答by Gnanam
All:
全部：
Am answering my question, after experiencing this on my own.
在我自己经历了这个之后，我正在回答我的问题。
How do I handle this in Java/JavaMail? Is it possible to catch & handle this timeout operations?
我如何在 Java/JavaMail 中处理这个问题？是否可以捕获并处理此超时操作？
Yes, it is automatically thrown as javax.mail.MessagingException.
是的，它会自动作为javax.mail.MessagingException抛出。
javax.mail.MessagingException: Exception reading response;
nested exception is:
java.net.SocketTimeoutException: Read timed out
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:297)
at javax.mail.Service.connect(Service.java:156)
at javax.mail.Service.connect(Service.java:105)
This exception is thrown exactly at this line:
这个异常正是在这一行抛出：
Transport.connect();
运输.connect();
Only open question I've now is "Is it possible to simulate/reproduce this timeout operation on my own assuming I've complete administration access to the SMTP server?"
我现在唯一的悬而未决的问题是“假设我拥有对 SMTP 服务器的完整管理访问权限，是否可以自己模拟/重现此超时操作？”
Any ideas from experts?
来自专家的任何想法？
