源代码如下：
<html>
<head>
<title> CH17 - JavaMail2.jsp </title>
</head>
<body>
<h2> 利用JavaMail来传送电子邮件 - HTML格式 </h2>
<%@ page import= "java.util.* " %>
<%@ page import= "javax.mail.* " %>
<%@ page import= "javax.activation.* " %>
<%@ page import= "javax.mail.internet.* " %>
<%@ page contentType= "text/html;charset=GB2312 " %>
<%
request.setCharacterEncoding( "GB2312 ");
String host = "smtp.gmail.com ";
String rec = request.getParameter( "To ");
String sen = request.getParameter( "From ");
String sub = request.getParameter( "Subject ");
String mess = request.getParameter( "Message ");
String username = "test ";
String password = "123456 ";
boolean sessionDebug = false;
Properties prop = System.getProperties();
prop.put( "mail.host ",host);
prop.put( "mail.transport.protocol ", "smtp ");
prop.put( "mail.smtp.auth ", "true ");
javax.mail.Session mailsess = Session.getDefaultInstance(prop, null);
mailsess.setDebug(sessionDebug);
Message msg = new MimeMessage(mailsess);
msg.setFrom(new InternetAddress(sen));
InternetAddress[] address= {new InternetAddress(rec)};
msg.setRecipients(Message.RecipientType.TO, address);
msg.setSubject(sub);
msg.setText(mess);
Transport transport = mailsess.getTransport( "smtp ");
transport.connect(host, username, password);
transport.sendMessage(msg,msg.getAllRecipients());
transport.close();
//transport.send(msg);
%>
出错提示：
exception
org.apache.jasper.JasperException: Could not connect to SMTP host: smtp.gmail.com, port: 25
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:512)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
javax.servlet.ServletException: Could not connect to SMTP host: smtp.gmail.com, port: 25
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:843)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:776)
org.apache.jsp.JavaMail_jsp._jspService(JavaMail_jsp.java:159)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)