SSLHandshakeException:握手过程中远程主机关闭连接

Question

我有以下方法可以使用imap从Gmail中检索消息

public static void main(String[] args)
    {
        Properties props = new Properties();
        try
        {
            props.load(new FileInputStream(new File("smtp.properties")));
            Session session = Session.getDefaultInstance(props, null);

            Store store = session.getStore("imaps");
            store.connect("smtp.gmail.com", "******@gmail.com", "mypass");

            Folder inbox = store.getFolder("inbox");
            inbox.open(Folder.READ_ONLY);
            int messageCount = inbox.getMessageCount();

            Message[] messages = inbox.getMessages();
            System.out.println("------------------------------");
            for (int i = 0; i < 10; i++)
            {
                System.out.println("Mail Subject:- " + messages[i].getSubject());
            }
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

我的smtp.properties包含

 mail.smtp.host=smtp.gmail.com
 mail.smtp.socketFactory.port=465
 mail.smtp.socketFactory.class=javax.net.ssl.SSLSocketFactory
 mail.smtp.auth=true
 mail.smtp.port=465

当我运行这个程序时，我得到了以下信息

javax.mail.MessagingException: Remote host closed connection during handshake;
  nested exception is:
    javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake
    at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:695)
    at javax.mail.Service.connect(Service.java:345)
    at javax.mail.Service.connect(Service.java:226)
    at gmailsmpt.Main.main(Main.java:25)
Caused by: javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake
    at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
    at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:532)
    at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:337)
    at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:229)
    at com.sun.mail.iap.Protocol.<init>(Protocol.java:116)
    at com.sun.mail.imap.protocol.IMAPProtocol.<init>(IMAPProtocol.java:121)
    at com.sun.mail.imap.IMAPStore.newIMAPProtocol(IMAPStore.java:710)
    at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:659)
    ... 3 more
Caused by: java.io.EOFException: SSL peer shut down incorrectly
    at sun.security.ssl.InputRecord.read(Unknown Source)
    ... 14 more

我如何解决这个问题？

Answer 1

首先，清理所有这些common mistakes。您不需要任何套接字工厂。

然后试试这些connection debugging tips。

可能您有防火墙或防病毒程序阻止您连接。

Answer 2

问题是JavaTLS1.0中的默认jre1.8.0_141版本，但是由于1.0中的漏洞，许多电子邮件服务器不再接受连接。为了在代码中直接使用1.2，在创建发送邮件的属性时，这条指令对我很有效：

props.put("mail.smtp.ssl.protocols", "TLSv1.2");

例如：

Properties props = System.getProperties();
props.put("mail.smtp.host", mailHost);
props.put("mail.smtps.auth", mailAuth);
props.put("mail.transport.protocol", mailProtocol);
props.put("mail.smtp.ssl.protocols", "TLSv1.2");

// Get a Session object
Session sess = Session.getInstance(props, null);

// construct the message
MimeMessage msg = new MimeMessage(sess);
msg.setFrom(new InternetAddress(mailUser));

还要注意，您可以只在try块开始处加载的属性文件(smtp.properties)中设置相同的属性。

Answer 3

还有更多的堆栈跟踪吗？较早的Java版本在与超过1024位的RSA密钥的TLS握手方面存在问题(也可能与具有确切位字节的密钥有关)。

此问题已在Java 1.7或Java 1.8中修复。