java JavaMail：套接字读取超时
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JavaMail: Socket read timeout
提问by Clark
I'm using JavaMail and I want it to work through proxy for every threads (I have multithreading application). I'm using SMTPTransport.connect(Socket socket) for this.
我正在使用 JavaMail，我希望它通过代理为每个线程工作（我有多线程应用程序）。我为此使用 SMTPTransport.connect(Socket socket)。
Here is socket initialization:
这是套接字初始化：
socket = new Socket();
socket.setSoTimeout(10000);
socket.connect(new InetSocketAddress(smtpHost, smtpPort));
Here is SMTPTransport call:
这是 SMTPTransport 调用：
SMTPTransport transport = null;
try
{
transport = (SMTPTransport) mail.getTransport("smtp");
transport.connect(socket);
System.out.println("ok");
And so on. But I this error happens:
等等。但我发生了这个错误：
DEBUG: JavaMail version 1.4.4 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,Sun Microsystems, Inc], com.sun.mail.smtp.SMTPTransport=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc], com.sun.mail.imap.IMAPSSLStore=javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Sun Microsystems, Inc], com.sun.mail.pop3.POP3SSLStore=javax.mail.Provider[STORE,pop3s,com.sun.mail.pop3.POP3SSLStore,Sun Microsystems, Inc], com.sun.mail.imap.IMAPStore=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Sun Microsystems, Inc], com.sun.mail.pop3.POP3Store=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Sun Microsystems, Inc]} DEBUG: Providers Listed By Protocol: {imaps=javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Sun Microsystems, Inc], imap=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Sun Microsystems, Inc], smtps=javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Sun Microsystems, Inc], pop3=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Sun Microsystems, Inc], pop3s=javax.mail.Provider[STORE,pop3s,com.sun.mail.pop3.POP3SSLStore,Sun Microsystems, Inc], smtp=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]} DEBUG: successfully loaded resource: /META-INF/javamail.default.address.map DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc] DEBUG SMTP: useEhlo true, useAuth true DEBUG SMTP: useEhlo true, useAuth true DEBUG SMTP: starting protocol to host "smtp.googlemail.com", port 465 DEBUG SMTP: exception reading response: java.net.SocketTimeoutException: Read timed out Exception reading response javax.mail.MessagingException: Exception reading response; nested exception is: java.net.SocketTimeoutException: Read timed out at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:2153) at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1956) at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:636) at javax.mail.Service.connect(Service.java:317) at javax.mail.Service.connect(Service.java:176) at javax.mail.Service.connect(Service.java:125) at com.sun.mail.smtp.SMTPTransport.connect(SMTPTransport.java:274) at lsmtpc.CheckAccount.run(CheckAccount.java:203) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) at java.util.concurrent.FutureTask.run(FutureTask.java:166) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:722) Caused by: java.net.SocketTimeoutException: Read timed out at java.net.SocketInputStream.socketRead0(Native Method) at java.net.SocketInputStream.read(SocketInputStream.java:150) at java.net.SocketInputStream.read(SocketInputStream.java:121) at com.sun.mail.util.TraceInputStream.read(TraceInputStream.java:110) at java.io.BufferedInputStream.fill(BufferedInputStream.java:235) at java.io.BufferedInputStream.read(BufferedInputStream.java:254) at com.sun.mail.util.LineInputStream.readLine(LineInputStream.java:89) at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:2131) ... 13 more
Sun Microsystems, Inc] DEBUG SMTP：useEhlo true，useAuth true DEBUG SMTP：useEhlo true，useAuth true DEBUG SMTP：启动协议到主机“smtp.googlemail.com”，端口 465 DEBUG SMTP：异常读取响应：java.net.SocketTimeoutException ：读取超时异常读取响应javax.mail.MessagingException：异常读取响应；嵌套异常是：java.net.SocketTimeoutException：读取超时在 com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:2153) 在 com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1956) ) 在 com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:636) 在 javax.mail.Service.connect(Service.java:317) 在 javax.mail.Service.connect(Service.java:176)在 com.sun.mail 的 javax.mail.Service.connect(Service.java:125)。
So as I see JavaMail can't read from socket. So what am I doing wrong? If I try to use transport.connect() method without using Socket in constructor all works perfectly and smtpHost/smtpPort are accessible from the telnet and I have no any firewalls/antiviruses.
所以我看到 JavaMail 无法从套接字读取。那我做错了什么？如果我尝试在构造函数中不使用 Socket 的情况下尝试使用 transport.connect() 方法，则一切正常，并且可以从 telnet 访问 smtpHost/smtpPort，并且我没有任何防火墙/防病毒软件。
回答by Perception
From the documentation for com.sun.mail.smtp.SMTPTransport:
来自 com.sun.mail.smtp.SMTPTransport 的文档：
In general, applications should not need to use the classes in this package directly. Instead, they should use the APIs defined by javax.mail package (and subpackages). Applications should never construct instances of SMTPTransport directly. Instead, they should use the Session method getTransport to acquire an appropriate Transport object.
WARNING: The APIs unique to this package should be considered EXPERIMENTAL. They may be changed in the future in ways that are incompatible with applications using the current APIs.
一般来说，应用程序不需要直接使用这个包中的类。相反，他们应该使用 javax.mail 包（和子包）定义的 API。应用程序不应直接构造 SMTPTransport 的实例。相反，他们应该使用 Session 方法 getTransport 来获取适当的 Transport 对象。
警告：此包独有的 API 应被视为实验性的。将来它们可能会以与使用当前 API 的应用程序不兼容的方式进行更改。
JavaMail tutorial: http://java.sun.com/developer/onlineTraining/JavaMail/contents.html
JavaMail 教程：http: //java.sun.com/developer/onlineTraining/JavaMail/contents.html
Could be you are not passing authentication information. Could be you are connecting to a secured host using a plain socket. You might want to read the tutorial linked for the best way to use JavaMail.
可能是您没有传递身份验证信息。可能是您使用普通套接字连接到安全主机。您可能想要阅读链接的教程，以了解使用 JavaMail 的最佳方式。
