使用JavaMail发送电子邮件，获取；“拒绝连接”；因为",；“连接太多”为什么？

我的站点基于JSP页面和servlet。我在vps上运行Tomcat 6

我正在使用JavaMail 1.4版在我的网站上发送电子邮件

我可以在会议期间发送一些电子邮件，但今天我的网站提交页面上出现了一个空白页面。所以我看了Tomcat日志，下面是发生的事情-

INFO | jvm 1 | 2010/12/15 10:29:13 | DEBUG: setDebug: JavaMail version 1.4.1 INFO | jvm 1 | 2010/12/15 10:29:13 | DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc] INFO | jvm 1 | 2010/12/15 10:29:13 | DEBUG SMTP: useEhlo true, useAuth true INFO | jvm 1 | 2010/12/15 10:29:13 | DEBUG SMTP: trying to connect to host "smtp.myisprovider.net", port 25, isSSL false INFO | jvm 1 | 2010/12/15 10:29:14 | 421 4.7.1 - Connection Refused - - Too many connections INFO | jvm 1 | 2010/12/15 10:29:14 | DEBUG SMTP: could not connect to host "smtp.myisprovider.net", port: 25, response: 421 INFO | jvm 1 | 2010/12/15 10:29:14 | INFO | jvm 1 | 2010/12/15 10:29:14 | javax.mail.MessagingException: Could not connect to SMTP host: smtp.myisprovider.net, port: 25, response: 421 INFO | jvm 1 | 2010/12/15 10:29:14 | at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1379) INFO | jvm 1 | 2010/12/15 10:29:14 | at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:412) INFO | jvm 1 | 2010/12/15 10:29:14 | at javax.mail.Service.connect(Service.java:288) INFO | jvm 1 | 2010/12/15 10:29:14 | at javax.mail.Service.connect(Service.java:169) INFO | jvm 1 | 2010/12/15 10:29:14 | at spyder.servlets.email.MessageCenterServlet.cancelService(MessageCenterServlet.java:836) INFO | jvm 1 | 2010/12/15 10:29:14 | at spyder.servlets.email.MessageCenterServlet.doPost(MessageCenterServlet.java:172) INFO | jvm 1 | 2010/12/15 10:29:14 | at spyder.servlets.email.MessageCenterServlet.doGet(MessageCenterServlet.java:39) INFO | jvm 1 | 2010/12/15 10:29:14 | at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) INFO | jvm 1 | 2010/12/15 10:29:14 | at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) INFO | jvm 1 | 2010/12/15 10:29:14 | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) INFO | jvm 1 | 2010/12/15 10:29:14 | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) INFO | jvm 1 | 2010/12/15 10:29:14 | at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) INFO | jvm 1 | 2010/12/15 10:29:14 | at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) INFO | jvm 1 | 2010/12/15 10:29:14 | at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) INFO | jvm 1 | 2010/12/15 10:29:14 | at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) INFO | jvm 1 | 2010/12/15 10:29:14 | at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) INFO | jvm 1 | 2010/12/15 10:29:14 | at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) INFO | jvm 1 | 2010/12/15 10:29:14 | at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190) INFO | jvm 1 | 2010/12/15 10:29:14 | at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:291) INFO | jvm 1 | 2010/12/15 10:29:14 | at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:774) INFO | jvm 1 | 2010/12/15 10:29:14 | at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:703) INFO | jvm 1 | 2010/12/15 10:29:14 | at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:896) INFO | jvm 1 | 2010/12/15 10:29:14 | at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690) INFO | jvm 1 | 2010/12/15 10:29:14 | at java.lang.Thread.run(Thread.java:595)

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我假设您在某个地方有这样一块代码：

Transport transport = session.getTransport("smtp");
transport.connect();
transport.sendMessage(message, message.getAllRecipients());
transport.close();

你在调用close方法吗

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另外，拨打这个电话的频率是多少？它可能只是您的提供商在练习防止垃圾邮件。

我在传输对象上调用close（），我只是检查了我的代码。事实上，我将发布一个我在我的一个servlet中用于发送电子邮件的方法的片段。也许你会发现一些我没有看到的东西。我将把代码附加到我的原始问题中…我也想知道，如果提供者限制了我。对于我在我的网站上测试的这个特定过程，将发送2封电子邮件。一个给我自己，一个给客户。我第一次尝试它时，它是成功的。两封电子邮件都已发送。第二次，只有第一次去了，然后就错了。7分钟后，我通过不同的jsp/servlet页面发送了一封电子邮件，邮件通过了。我想问题已经解决了。在我的servlet中有一个发送两封电子邮件的方法。这个问题是，我已经建立了两个连接到传输，一个接一个，因为我有两封电子邮件要发送。每次请求连接后都需要关闭传输对象。我做了一些测试，邮件发送成功。所以现在问题已经解决了：）谢谢你的帮助。

/*SIMPLE EMAIL TO GMAIL OR YAHOO MAIL USING JAVA*/
import java.awt.HeadlessException;
import java.util.Properties;
import javax.mail.Address;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class JavaMail {

    public static void main(String args[]) {
        new JavaMail().email();
    }

    public void email() {
        String from = "your_email@domain.com";
        String password = "your_secret_password";
        String to = "email_to@domain.com";
        String subject = "email_subject";
        String msg = "email_message";
        Properties properties = System.getProperties();
        properties = setProp(from, to);
        Session session = Session.getDefaultInstance(properties);

        try {
            Address address = new InternetAddress(to, "LovenishGoyal");
            MimeMessage message = new MimeMessage(session);
            message.setFrom(address);
            message.addRecipient(Message.RecipientType.TO, address);
            message.setSubject(subject);
            message.setText(msg);
            message.saveChanges();
            Transport transport = session.getTransport();
            System.out.println("connecting...");
            transport.connect(from, password);
            System.out.println("connected!");
            System.out.println("sending...");
            transport.sendMessage(message, message.getAllRecipients());
            transport.close();
            System.out.println("Sent message successfully....");

        } catch (Exception mex) {
            mex.printStackTrace();
        }

    }

    private Properties setProp(String email, String targetEmail) {
        Properties props = null;
        try {
            props = System.getProperties();
            if (email.contains(",") || targetEmail.contains(",")) {
                System.out.println("Please send one email to one person at a time...");
            } else if (email.contains("@yahoo.com")) {
                props.put("mail.smtp.host", "smtp.mail.yahoo.com");
                props.put("mail.smtp.socketFactory.port", "465");
                props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
                props.put("mail.smtp.host", "smtp.mail.yahoo.com");
                props.put("mail.smtp.auth", true);
            } else if (email.contains("@gmail.com")) {
                props.put("mail.smtp.host", "smtp.gmail.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");
            } else {
                System.out.println("Your Email Address is invalid\n or host not supported!");
            }

        } catch (HeadlessException exp) {
            System.out.println(exp);
        }
        return props;
    }

}

/*SIMPLE EMAIL TO GMAIL OR YAHOO MAIL USING JAVA*/
import java.awt.HeadlessException;
import java.util.Properties;
import javax.mail.Address;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class JavaMail {

    public static void main(String args[]) {
        new JavaMail().email();
    }

    public void email() {
        String from = "your_email@domain.com";
        String password = "your_secret_password";
        String to = "email_to@domain.com";
        String subject = "email_subject";
        String msg = "email_message";
        Properties properties = System.getProperties();
        properties = setProp(from, to);
        Session session = Session.getDefaultInstance(properties);

        try {
            Address address = new InternetAddress(to, "LovenishGoyal");
            MimeMessage message = new MimeMessage(session);
            message.setFrom(address);
            message.addRecipient(Message.RecipientType.TO, address);
            message.setSubject(subject);
            message.setText(msg);
            message.saveChanges();
            Transport transport = session.getTransport();
            System.out.println("connecting...");
            transport.connect(from, password);
            System.out.println("connected!");
            System.out.println("sending...");
            transport.sendMessage(message, message.getAllRecipients());
            transport.close();
            System.out.println("Sent message successfully....");

        } catch (Exception mex) {
            mex.printStackTrace();
        }

    }

    private Properties setProp(String email, String targetEmail) {
        Properties props = null;
        try {
            props = System.getProperties();
            if (email.contains(",") || targetEmail.contains(",")) {
                System.out.println("Please send one email to one person at a time...");
            } else if (email.contains("@yahoo.com")) {
                props.put("mail.smtp.host", "smtp.mail.yahoo.com");
                props.put("mail.smtp.socketFactory.port", "465");
                props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
                props.put("mail.smtp.host", "smtp.mail.yahoo.com");
                props.put("mail.smtp.auth", true);
            } else if (email.contains("@gmail.com")) {
                props.put("mail.smtp.host", "smtp.gmail.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");
            } else {
                System.out.println("Your Email Address is invalid\n or host not supported!");
            }

        } catch (HeadlessException exp) {
            System.out.println(exp);
        }
        return props;
    }

}