JAVA/JSP Learning Series 10

A: condition must download sun's JavaMail API package, address: http://java.sun.com/products/javamail/

I use version 1.2 here and add the relevant package (jar file) to CLASSPATH.

II. This program is very simple, and we don't need to consider a lot of ground layer things, because the API has helped us do these things well. Below is a simple e-mail Servlet: (for people familiar with it, i'm afraid it's a simple servlet)

Import java. io .*;

Import javax. servlet .*;

Import javax. servlet. http .*;

Import sun.net. smtp .*;

Public class SendMailServlet extends HttpServlet {

Public static String MAIL_FROM = "from ";

Public static String MAIL_TO = "";

Public static String MAIL_SUBJECT = "subject ";

Public static String MAIL_BODY = "body ";

Public static String MAIL_HOST = "mailhost ";

Public void doGet (HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException

{

Resp. setContentType ("text/html; charset = gb2312 ");

PrintWriter out = resp. getWriter ();

Out. println ("<form method = POST action =" "+ req. getRequestURI () +" "> ");

Out. println ("<table> ");

Out. println ("<tr> <td> send mail server: </td> ");

Out. println ("<td> <input type = text name =" + MAIL_HOST + "size = 30> </td> </tr> ");

Out. println ("<tr> <td> from: </td> ");

Out. println ("<td> <input type = text name =" + MAIL_FROM + "size = 30> </td> </tr> ");

Out. println ("<tr> <td> to: </td> ");

Out. println ("<td> <input type = text name =" + MAIL_TO + "size = 30> </td> </tr> ");

Out. println ("<tr> <td> subject: </td> ");

Out. println ("<td> <input type = text name =" + MAIL_SUBJECT + "size = 30> </td> </tr> ");

Out. println ("<tr> <td> text: </td> ");

Out. println ("<td> <textarea name =" + MAIL_BODY + "cols = 40 rows = 10> </textarea> </td> </tr> ");

Out. println ("</table> <br> ");

Out. println ("<input type = submit value =" Send "> ");

Out. println ("<input type = reset value =" Reset "> ");

Out. println ("</form> ");

Out. flush ();

}

Public void doPost (HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException

{

Resp. setContentType ("text/html; charset = gb2312 ");

PrintWriter out = new PrintWriter (resp. getOutputStream ());

String from = req. getParameter (MAIL_FROM );

String to = req. getParameter (MAIL_TO );

String subject = req. getParameter (MAIL_SUBJECT );

String body = req. getParameter (MAIL_BODY );

String mailhost = req. getParameter (MAIL_HOST );

Try

{

SmtpClient mailer = new SmtpClient (mailhost );

Mailer. from (from );

Mailer. to ();

PrintStream ps = mailer. startMessage ();

Ps. println ("From:" + from );

Ps. println ("To:" + );

Ps. println ("Subject:" + subject );

Ps. println (body );

Mailer. closeServer ();

Out. println ("Success! ");

}

Catch (Exception ex)

{

Out. println ("An error about:" + ex. getMessage ());

}

Out. flush ();

}

Public void init (ServletConfig cfg) throws ServletException

{

Super. init (cfg );

}

Public void destroy ()

{

Super. destroy ();

}

}