java邮件保持传输对象连接 [英] java mail keeping Transport object connected

问题描述

我已经在我的代码中将这个代码写入了一个简单的Web应用程序中的类文件：

/ p>

  @Resource（name =myMailServer）
 private Session mailSession; 
 
运输运输; 
 
 public boolean sendMail（String recipient，String subject，String text）{
 boolean exe = false; 
 
属性p = new Properties（）; 
 
字符串用户名=[e-mail]; 
字符串密码=密码; 
 
 InitialContext c = null; 
 
尝试
 {
 c = new InitialContext（）; 
 mailSession =（javax.mail.Session）c.lookup（java：comp / env / myMailServer）; 
} 
 catch（NamingException ne）
 {
 ne.printStackTrace（）; 
} 
 
 try 
 {
 Message msg = new MimeMessage（mailSession）; 
 msg.setRecipients（Message.RecipientType.TO，InternetAddress.parse（recipient，false））; 
 msg.setSubject（subject）; 
 msg.setText（text）; 
 msg.setHeader（MIME-Version，1.0）; 
 msg.setHeader（Content-Type，text / html）; 
 msg.setHeader（X-Mailer，Recommend-It Mailer V2.03c02）; 
 msg.saveChanges（）; 
 
 //Transport.send(msg）; 
 if（transport == null）{
 transport = mailSession.getTransport（smtps）; 
 System.out.println（+ transport.isConnected（））; 
 if（！transport.isConnected（））{
 transport.connect（username，password）; 
} 
} 
 
 transport.sendMessage（msg，msg.getAllRecipients（））; 
 exe = true; 
} 
 catch（AddressException e）
 {
 e.printStackTrace（）; 
 exe = false; 
} 
 catch（MessagingException e）
 {
 e.printStackTrace（）; 
 exe = false; 
 
 finally {
 / * try {
 if（transport！= null）
 transport.close（）; 
} 
 catch（MessagingException me）{
 me.printStackTrace（）; 
} 
 catch（Exception e）{
 e.printStackTrace（）; 
} * / 
} 
 
 return exe; 
} 
  

完整代码这里

现在我每次运行这段代码都需要一段时间才能连接邮件服务器/>
和行

  System.out.println（+ transport.isConnected（））; 
  

会打印一个假的

我如何保留对象传输，因为它会得到空值并进入块

  if（transport == null）{
  

或传输对象保持连接状态...

谢谢

Pradyut

解决方案

代码应该是....

与传输对象的静态初始化

没有任何问题
但可以用函数
静态传输getTransport（）方法很好

  @Resource（name =myMailServer）
 private Session mailSession; 
 
静态运输运输; 
 
 public boolean sendMail（String recipient，String subject，String text）{
 boolean exe = false; 
 
属性p = new Properties（）; 
 
字符串用户名=[e-mail]; 
字符串密码=密码; 
 
 InitialContext c = null; 
 
尝试
 {
 c = new InitialContext（）; 
 mailSession =（javax.mail.Session）c.lookup（java：comp / env / myMailServer）; 
} 
 catch（NamingException ne）
 {
 ne.printStackTrace（）; 
} 
 
 try 
 {
 Message msg = new MimeMessage（mailSession）; 
 msg.setRecipients（Message.RecipientType.TO，InternetAddress.parse（recipient，false））; 
 msg.setSubject（subject）; 
 msg.setText（text）; 
 msg.setHeader（MIME-Version，1.0）; 
 msg.setHeader（Content-Type，text / html）; 
 msg.setHeader（X-Mailer，Recommend-It Mailer V2.03c02）; 
 msg.saveChanges（）; 
 
 //Transport.send(msg）; 
 if（transport == null）{
 
 transport = mailSession.getTransport（smtps）; （！！transport.isConnected（））{
 
 transport.connect（username，password）; 
 
 
 
 
} 
 
 transport.sendMessage（msg，msg.getAllRecipients（））; 
 exe = true; 
} 
 catch（AddressException e）
 {
 e.printStackTrace（）; 
 exe = false; 
} 
 catch（MessagingException e）
 {
 e.printStackTrace（）; 
 exe = false; 
 
 finally {
 / * try {
 if（transport！= null）
 transport.close（）; 
} 
 catch（MessagingException me）{
 me.printStackTrace（）; 
} 
 catch（Exception e）{
 e.printStackTrace（）; 
} * / 
} 
 
 return exe; 
} 
  

谢谢

问候

Pradyut

How do i keep the java mail transport object alive or connected.

I have written this in my code in a simple class file inside a web application : -

@Resource(name = "myMailServer")
    private Session mailSession;

    Transport transport ;

public boolean sendMail(String recipient, String subject, String text) {
    boolean exe = false;

    Properties p = new Properties();

    String username = "[e-mail]";
    String password = "password";

    InitialContext c = null;

    try
    {
         c = new InitialContext();
          mailSession = (javax.mail.Session) c.lookup("java:comp/env/myMailServer");
    }
    catch(NamingException ne)
    {
        ne.printStackTrace();
    }

    try
    {
        Message msg = new MimeMessage(mailSession);
        msg.setRecipients(Message.RecipientType.TO,InternetAddress.parse(recipient, false));
        msg.setSubject(subject);
        msg.setText(text);
        msg.setHeader("MIME-Version" , "1.0" );
        msg.setHeader("Content-Type" , "text/html" );
        msg.setHeader("X-Mailer", "Recommend-It Mailer V2.03c02");
        msg.saveChanges();

        //Transport.send(msg);
        if(transport == null) {
            transport = mailSession.getTransport("smtps");
            System.out.println("" + transport.isConnected());
            if(!transport.isConnected()) {
                transport.connect(username, password);
            }
        }

        transport.sendMessage(msg, msg.getAllRecipients());
        exe = true;
    }
    catch (AddressException e)
    {
        e.printStackTrace();
        exe = false;
    }
    catch (MessagingException e)
    {
        e.printStackTrace();
        exe = false;
    }
    finally {
        /*try {
            if(transport != null)
                transport.close();
        }
        catch(MessagingException me) {
            me.printStackTrace();
        }
        catch(Exception e) {
            e.printStackTrace();
        }*/
    }

    return exe;
}

the full code here
Now everytime i run this code it takes some time to connect with the mail server
and the line

System.out.println("" + transport.isConnected());

prints a false

How do i retain the object transport as it does gets null and into the block

if(transport == null) {

or the transport object remains connected...

Thanks
Pradyut

解决方案

the code should be....
with a static initialization of transport object
without any problems
but can be good with a function static Transport getTransport() method

@Resource(name = "myMailServer")
    private Session mailSession;

    static Transport transport ;

    public boolean sendMail(String recipient, String subject, String text) {
    boolean exe = false;

    Properties p = new Properties();

    String username = "[e-mail]";
    String password = "password";

    InitialContext c = null;

    try
    {
         c = new InitialContext();
          mailSession = (javax.mail.Session) c.lookup("java:comp/env/myMailServer");
    }
    catch(NamingException ne)
    {
        ne.printStackTrace();
    }

    try
    {
        Message msg = new MimeMessage(mailSession);
        msg.setRecipients(Message.RecipientType.TO,InternetAddress.parse(recipient, false));
        msg.setSubject(subject);
        msg.setText(text);
        msg.setHeader("MIME-Version" , "1.0" );
        msg.setHeader("Content-Type" , "text/html" );
        msg.setHeader("X-Mailer", "Recommend-It Mailer V2.03c02");
        msg.saveChanges();

        //Transport.send(msg);
        if(transport == null) {

            transport = mailSession.getTransport("smtps");


        }
        if(!transport.isConnected()) {

                transport.connect(username, password);
            }

        transport.sendMessage(msg, msg.getAllRecipients());
        exe = true;
    }
    catch (AddressException e)
    {
        e.printStackTrace();
        exe = false;
    }
    catch (MessagingException e)
    {
        e.printStackTrace();
        exe = false;
    }
    finally {
        /*try {
            if(transport != null)
                transport.close();
        }
        catch(MessagingException me) {
            me.printStackTrace();
        }
        catch(Exception e) {
            e.printStackTrace();
        }*/
    }

    return exe;
}

Thanks
Regards
Pradyut

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