java - 使用 AuthenticatingSMTPClient 和 SSL？

Question

我需要使用 SSL (SMTPS) 和身份验证发送电子邮件。然而，在 apache Commons Net 中似乎有 AuthenticatingSMTPClient（没有 SSL，虽然它扩展了 SMTPSClient？）或 SMTPSClient（没有身份验证？），我需要两者的组合（SSL + 身份验证）。任何人都知道我该怎么做？谢谢！

Answer 1

我知道现在回复这个为时已晚，但为了其他人的未来参考，AuthenticatingSMTPClient确实提供ssl + authentication，因为它正在扩展SMTPSClient.下面是示例代码，必须在我用数字（例如//1）注释的地方进行修改。

代码：

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.net.PrintCommandListener;
import org.apache.commons.net.io.Util;
import org.apache.commons.net.smtp.AuthenticatingSMTPClient;
import org.apache.commons.net.smtp.AuthenticatingSMTPClient.AUTH_METHOD;
import org.apache.commons.net.smtp.SMTPReply;
import org.apache.commons.net.smtp.SimpleSMTPHeader;

public final class SMTPMail
{
    public static void main(String[] args) throws InvalidKeyException, NoSuchAlgorithmException, InvalidKeySpecException
    {
        String sender, recipient, subject, filename, server;
        List<String> ccList = new ArrayList<String>();
        FileReader fileReader = null;
        Writer writer;
        SimpleSMTPHeader header;
        AuthenticatingSMTPClient client;

        server = "<smtp server>"; // 1
        try
        {
            sender = "<your user name>"; // 2
            recipient = "<recipient>"; // 3
            subject = "<mail subject>"; // 4

            header = new SimpleSMTPHeader(sender, recipient, subject);
            filename = "hello.txt"; //This will be the body of your mail //5

            try
            {
                fileReader = new FileReader(filename);
            }
            catch (FileNotFoundException e)
            {
                System.err.println("File not found. " + e.getMessage());
            }

            client = new AuthenticatingSMTPClient("TLS", false);
            client.addProtocolCommandListener(new PrintCommandListener(
                    new PrintWriter(System.out), true));

            client.connect(server);

            if (!SMTPReply.isPositiveCompletion(client.getReplyCode()))
            {
                client.disconnect();
                System.err.println("SMTP server refused connection.");
                System.exit(1);
            }

            client.login("hostname.testing.smtp.api"); //6

            if(client.execTLS())
            {
                if(client.auth(AUTH_METHOD.LOGIN, "<your user name>", "<your password>")) //7
                {
                    client.setSender(sender);
                    client.addRecipient(recipient);
                    for (String recpt : ccList) {
                        client.addRecipient(recpt);
                    }

                    writer = client.sendMessageData();

                    if (writer != null)
                    {
                        writer.write(header.toString());
                        Util.copyReader(fileReader, writer);
                        writer.close();
                        client.completePendingCommand();
                    }

                    if (fileReader != null ) {
                        fileReader.close();
                    }
                }
            }
            client.logout();
            client.disconnect();
        }
        catch (IOException e)
        {
            e.printStackTrace();
            System.exit(1);
        }
    }
}