mailservlet.java

Session session = null;
        try {
            Context initCtx = new InitialContext();
            session = (Session) initCtx.lookup("java:comp/env/mail/Session");
        } catch (Exception ex) {
            System.out.println("lookup error");
            System.out.println(ex.getMessage());
            ex.printStackTrace();
        }

web inf/web.xml

<web-app>
    <resource-ref>
        <description>mail Session</description>
        <res-ref-name>mail/Session</res-ref-name>
        <res-type>jakarta.mail.Session</res-type>
        <res-auth>Container</res-auth>
    </resource-ref>
......
</web-app>

meta inf/context.xml

<Context>
    <Resource name="mail/Session" auth="Container" type="jakarta.mail.Session"
    mail.transport.protocol="smtp"
    mail.smtp.auth="true"
    mail.smtp.host="smtp.gmail.com"
    mail.smtp.port="465"
    mail.smtp.user="xxxxxxx"
    password="xxxxxxxx"
    mail.from="xxxxxxx@gmail.com"
    mail.smtp.quitwait="false"
    mail.smtp.starttls.enable="true"
    mail.smtp.socketFactory.class="jakarta.net.ssl.SSLSocketFactory"
    mail.debug="true"/>
</Context>

错误：com.sun.mail.util.mailconnectexception:无法连接到主机，端口：localhost，25；超时-1；
我试图做的是通过tomcat创建一个邮件会话示例，并从这个mailid发送电子邮件。我搜索了很多tomcat的how to's。http://tomcat.apache.org/tomcat-7.0-doc/jndi-resources-howto.html#javamail_sessions. 但我找不到导致这种情况的错误。