首先我使用glassfish4服务器。当我尝试从我的网络测试应用程序发送电子邮件时，我收到一个通常说的异常：
javax.mail.MessagingException：无法连接到 SMTP 主机：mail.host.com，端口：465，响应：-1
（我也有另一个例外，但我不记得了），但是从我的 SE 应用程序中，它每次都正确发送电子邮件。此外，我的同事在他的计算机上拥有与我相同的代码，并且代码有效。我还尝试使用 smtp.gmail.com 发送电子邮件，它的工作原理很有趣，但是当我尝试使用我们的私人服务器时，它不起作用。
这是我的网络应用程序中的代码：
@WebServlet("/email")
public class Email extends HttpServlet{
private static final String SUBJECT = "TEST";
private static final String CONTENT = "<h1>HI</h1>"
+ "<header style='width: 100%; height=20vh; background: #ffdd1a; color: #383e72;'>"
+ "<h1>TEST</h1>"
+ "<h2>KTHXBYE</h2>"
+ "</header>";
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String name = req.getParameter("name"),
eMail = req.getParameter("eMail"),
server = req.getParameter("server"),
port = req.getParameter("port"),
encryption = req.getParameter("encryption"),
mailTo = req.getParameter("mailTo");
final String username = req.getParameter("username"),
pass = req.getParameter("pass");
resp.setCharacterEncoding("UTF-8");
Session session;
// setup acc props
Properties props = System.getProperties();
props.put("mail.smtp.host", server);
props.put("mail.smtp.port", port);
props.put("mail.smtp.auth", "true");
props.put("mail.transport.protocol", "smtp");
switch (povezava) {
case "SSL":
props.put("mail.smtp.socketFactory.port", "port");
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
break;
case "TLS":
props.put("mail.smtp.starttls.enable", "true");
break;
case "NONE":
props.put("mail.smtp.ssl.enable", "false");
props.put("mail.smtp.starttls.enable", "false");
props.put("mail.smtp.ssl.trust", server);
break;
default:
resp.getWriter().print("ERROR");
return;
}
Authenticator auth = new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(username, pass);
}
};
// create msg
session = Session.getDefaultInstance(props, auth);
session.setDebug(true);
MimeMessage message = new MimeMessage(session);
try {
try {
message.setFrom(new InternetAddress(eMail, name));
message.setSubject(SUBJECT);
MimeMultipart multipart = new MimeMultipart("related");
BodyPart bodyPart = new MimeBodyPart();
bodyPart.setContent(CONTENT, "text/html; charset=utf-8");
multipart.addBodyPart(bodyPart);
message.setContent(multipart);
// send msg
message.setRecipient(Message.RecipientType.TO, new InternetAddress(mailTo));
// Transport transport = session.getTransport("smtp");
// transport.connect(server, username, pass);
// transport.sendMessage(message, message.getAllRecipients());
Transport.send(message);
resp.getWriter().print("Mail was send successfully");
return;
} catch (MessagingException ex) {
Logger.getLogger(Email.class.getName()).log(Level.SEVERE, null, ex);
}
} catch (UnsupportedEncodingException ex) {
Logger.getLogger(Email.class.getName()).log(Level.SEVERE, null, ex);
}
resp.getWriter().print("Sending mail failed");
}
}
来自上层代码的堆栈跟踪：
javax.mail.MessagingException: Could not connect to SMTP host: mail.host.com, port: 465, response: -1
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2042)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:697)
at javax.mail.Service.connect(Service.java:386)
at javax.mail.Service.connect(Service.java:245)
at javax.mail.Service.connect(Service.java:194)
at javax.mail.Transport.send0(Transport.java:253)
at javax.mail.Transport.send(Transport.java:124)
at com.zarja.testmail.Email.doPost(Email.java:113)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:416)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:283)
at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:283)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:200)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:132)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:111)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:536)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:591)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:571)
at java.lang.Thread.run(Thread.java:748)
现在我的 SE 应用代码：
public static void main(String[] args) {
System.out.println(sendMyMail());
}
public static String sendMyMail() {
try {
String from = "mailaddress"; // not actual mail
String pass = "password";
Authenticator auth = new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(from, pass);
}
};
Session session;
//setup account properties
Properties props = System.getProperties();
props.put("mail.smtp.host", "mail.host.com");
props.put("mail.smtp.socketFactory.port", "465");
props.put("mail.smtp.socketFactory.class",
"javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.port", "465");
session = Session.getDefaultInstance(props, auth);
session.setDebug(true);
MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress(from, "TEST"));
message.setSubject(SUBJECT);
MimeMultipart multipart = new MimeMultipart("related");
BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setContent(CONTENT, "text/html; charset=utf-8");
multipart.addBodyPart(messageBodyPart);
message.setContent(multipart);
//send message
try {
message.setRecipient(Message.RecipientType.TO, new InternetAddress("[email protected]"));
// Transport transport = session.getTransport("smtp");
// transport.connect("mail.host.com", from, pass);
// transport.sendMessage(message, message.get
AllRecipients());
Transport .send(message);
return "SENT";
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
return "FAILED";
}
我在这里先向您的帮助表示感谢！
编辑（代码应该看起来如何）：
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String name = req.getParameter("name"),
eMail = req.getParameter("eMail"),
server = req.getParameter("server"),
port = req.getParameter("port"),
encryption = req.getParameter("encryption"),
mailTo = req.getParameter("mailTo");
final String username = req.getParameter("username"),
pass = req.getParameter("pass");
resp.setCharacterEncoding("UTF-8");
Session session;
// setup acc props
Properties props = System.getProperties();
props.put("mail.smtp.host", server);
props.put("mail.smtp.port", port);
props.put("mail.smtp.auth", "true");
props.put("mail.transport.protocol", "imap");
switch (enryption) {
case "SSL":
props.put("mail.smtp.ssl.enable", "true");
break;
case "TLS":
props.put("mail.smtp.starttls.enable", "true");
break;
case "NONE":
props.put("mail.smtp.ssl.enable", "false");
props.put("mail.smtp.starttls.enable", "false");
props.put("mail.smtp.ssl.trust", server);
break;
default:
resp.getWriter().print("ERROR");
return;
}
// create msg
session = Session.getInstance(props);
session.setDebug(true);
MimeMessage message = new MimeMessage(session);
try {
try {
message.setFrom(new InternetAddress(eMail, name));
message.setSubject(SUBJECT);
MimeMultipart multipart = new MimeMultipart("related");
BodyPart bodyPart = new MimeBodyPart();
bodyPart.setContent(CONTENT, "text/html; charset=utf-8");
multipart.addBodyPart(bodyPart);
message.setContent(multipart);
// send msg
message.setRecipient(Message.RecipientType.TO, new InternetAddress(mailTp));
Transport transport = session.getTransport("imap");
transport.connect(streznikPoste, uporabniskoIme, geslo);
Transport.send(message);
resp.getWriter().print("Mail was send successfully");
return;
} catch (MessagingException ex) {
Logger.getLogger(Email.class.getName()).log(Level.SEVERE, null, ex);
}
} catch (UnsupportedEncodingException ex) {
Logger.getLogger(Email.class.getName()).log(Level.SEVERE, null, ex);
}
resp.getWriter().print("Sending mail failed");
}
编辑修复（这似乎有效）：
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String name = req.getParameter("name"),
eMail = req.getParameter("eMail"),
server = req.getParameter("server"),
port = req.getParameter("port"),
encryption = req.getParameter("encryption"),
mailTo = req.getParameter("mailTo");
final String username = req.getParameter("username"),
pass = req.getParameter("pass");
resp.setCharacterEncoding("UTF-8");
Session session;
// setup acc props
Properties props = System.getProperties();
props.put("mail.smtp.host", server);
props.put("mail.smtp.port", port);
props.put("mail.smtp.auth", "true");
props.put("mail.transport.protocol", "smtp");
props.put("mail.smtp.ssl.trust", server);
switch (encryption) {
case "SSL":
props.put("mail.smtp.ssl.enable", "true");
break;
case "TLS":
props.put("mail.smtp.starttls.enable", "true");
break;
case "NONE":
props.put("mail.smtp.ssl.enable", "false");
props.put("mail.smtp.starttls.enable", "false");
props.put("mail.smtp.ssl.trust", server);
break;
default:
resp.getWriter().print("ERROR");
return;
}
// create msg
session = Session.getInstance(props);
session.setDebug(true);
MimeMessage message = new MimeMessage(session);
try {
try {
message.setFrom(new InternetAddress(eMail, name));
message.setSubject(SUBJECT);
MimeMultipart multipart = new MimeMultipart("related");
BodyPart bodyPart = new MimeBodyPart();
bodyPart.setContent(CONTENT, "text/html; charset=utf-8");
multipart.addBodyPart(bodyPart);
message.setContent(multipart);
// send msg
message.setRecipient(Message.RecipientType.TO, new InternetAddress(mailTo));
Transport transport = session.getTransport();
transport.connect(server, username, pass);
Transport.send(message, username, pass);
resp.getWriter().print("Mail was send successfully");
return;
} catch (MessagingException ex) {
Logger.getLogger(Email.class.getName()).log(Level.SEVERE, null, ex);
}
} catch (UnsupportedEncodingException ex) {
Logger.getLogger(Email.class.getName()).log(Level.SEVERE, null, ex);
}
resp.getWriter().print("Sending mail failed");
}
首先，修复所有这些常见的 JavaMail 错误。
如果您可以连接到一台远程服务器但不能连接到另一台远程服务器，则说明您对该服务器的配置有误，或者您的防火墙阻止了连接。JavaMail FAQ提供了调试连接问题的技巧。
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