如何调试使用JavaMail API的应用程序？
要在运行Java邮件程序时要求Java邮件打印出调试消息，可以添加mail.debug并将其值设置true为用于创建会话对象的属性。
另一种方法是使用session.setDebug()方法设置会话的调试设置并true作为参数传递。这还将打开Java邮件程序中的调试消息。
package org.nhooo.example.mail;
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Date;
import java.util.Properties;
public class MailDebugDemo {
public static void main(String[] args) {
MailDebugDemo.sendMail("nhooo@gmail.com", "nhooo@gmail.com",
"Debug Demo", "Mail Debug Demo");
}
private static void sendMail(String mailFrom, String mailTo, String mailSubject,
String mailText) {
Properties props = new Properties() {{
put("mail.smtp.auth", "true");
put("mail.smtp.host", "smtp.gmail.com");
put("mail.smtp.port", "587");
put("mail.smtp.starttls.enable", "true");
put("mail.debug", "true");
}};
//创建一个邮件会话。我们需要提供用户名和
//GMail验证的密码。
Session session = Session.getInstance(props, new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("nhooo", "********");
}
});
try {
//创建电子邮件
Message message = new MimeMessage(session);
message.setSentDate(new Date());
message.setFrom(new InternetAddress(mailFrom));
message.setRecipient(Message.RecipientType.TO,
new InternetAddress(mailTo));
message.setSubject(mailSubject);
message.setText(mailText);
//发送消息
Transport.send(message, "nhooo", "********");
} catch (MessagingException e) {
e.printStackTrace();
}
}
}这是使用GmailSMTP服务器发送电子邮件时JavaMailAPI生成的调试信息的示例。
DEBUG: JavaMail version 1.5.6
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,Oracle], com.sun.mail.smtp.SMTPTransport=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle], com.sun.mail.imap.IMAPSSLStore=javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Oracle], com.sun.mail.pop3.POP3SSLStore=javax.mail.Provider[STORE,pop3s,com.sun.mail.pop3.POP3SSLStore,Oracle], com.sun.mail.imap.IMAPStore=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Oracle], com.sun.mail.pop3.POP3Store=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Oracle]}
DEBUG: Providers Listed By Protocol: {imaps=javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Oracle], imap=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Oracle], smtps=javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Oracle], pop3=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Oracle], pop3s=javax.mail.Provider[STORE,pop3s,com.sun.mail.pop3.POP3SSLStore,Oracle], smtp=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]}
DEBUG: successfully loaded resource: /META-INF/javamail.default.address.map
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "smtp.gmail.com", port 587, isSSL false
220 smtp.gmail.com ESMTP e64sm51975202pfl.49 - gsmtp
DEBUG SMTP: connected to host "smtp.gmail.com", port: 587
EHLO pluto
250-smtp.gmail.com at your service, [180.252.60.172]
250-SIZE 35882577
250-8BITMIME
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-CHUNKING
250 SMTPUTF8
DEBUG SMTP: Found extension "SIZE", arg "35882577"
DEBUG SMTP: Found extension "8BITMIME", arg ""
DEBUG SMTP: Found extension "STARTTLS", arg ""
DEBUG SMTP: Found extension "ENHANCEDSTATUSCODES", arg ""
DEBUG SMTP: Found extension "PIPELINING", arg ""
DEBUG SMTP: Found extension "CHUNKING", arg ""
DEBUG SMTP: Found extension "SMTPUTF8", arg ""
STARTTLS
220 2.0.0 Ready to start TLS
EHLO pluto
250-smtp.gmail.com at your service, [180.252.60.172]
250-SIZE 35882577
250-8BITMIME
250-AUTH LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-CHUNKING
250 SMTPUTF8
DEBUG SMTP: Found extension "SIZE", arg "35882577"
DEBUG SMTP: Found extension "8BITMIME", arg ""
DEBUG SMTP: Found extension "AUTH", arg "LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH"
DEBUG SMTP: Found extension "ENHANCEDSTATUSCODES", arg ""
DEBUG SMTP: Found extension "PIPELINING", arg ""
DEBUG SMTP: Found extension "CHUNKING", arg ""
DEBUG SMTP: Found extension "SMTPUTF8", arg ""
DEBUG SMTP: Attempt to authenticate using mechanisms: LOGIN PLAIN DIGEST-MD5 NTLM
DEBUG SMTP: AUTH LOGIN command trace suppressed
DEBUG SMTP: AUTH LOGIN succeeded
DEBUG SMTP: use8bit false
MAIL FROM:<nhooo@gmail.com>
250 2.1.0 OK e64sm51975202pfl.49 - gsmtp
RCPT TO:<nhooo@gmail.com>
250 2.1.5 OK e64sm51975202pfl.49 - gsmtp
DEBUG SMTP: Verified Addresses
DEBUG SMTP: nhooo@gmail.com
DATA
354 Go ahead e64sm51975202pfl.49 - gsmtp
Date: Mon, 5 Jun 2017 12:12:54 +0800 (WITA)
From: nhooo@gmail.com
To: nhooo@gmail.com
Message-ID: <1368884364.0.1496635974662@pluto>
Subject: Debug Demo
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Mail Debug Demo
.
250 2.0.0 OK 1496635979 e64sm51975202pfl.49 - gsmtp
QUIT
221 2.0.0 closing connection e64sm51975202pfl.49 - gsmtpMaven依赖
<!-- http://repo1.maven.org/maven2/javax/mail/javax.mail-api/1.5.6/javax.mail-api-1.5.6.jar -->
<dependency>
<groupId>javax.mail</groupId>
<artifactId>javax.mail-api</artifactId>
<version>1.5.6</version>
</dependency>
<!-- http://repo1.maven.org/maven2/javax/mail/mail/1.4.7/mail-1.4.7.jar -->
<dependency>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
<version>1.4.7</version>
</dependency>