Sending an e-mail in java without the JavaMail API
I'm developing an application, where users have the option to have sent an e-mail to a specified e-mail every x minutes.
I don't want to rely on JavaMail (i.e. rely on whether my users have added the JavaMail jar to their classpath).
I realize that I could go on and create a server for doing this and connect to it with the necessary details, but this is last option.
How would I go on sending an e-mail in this case?
Are there any online services etc (paid or free) that provides a solution for this? For example connecting to them and specifying recipient e-mail and message, they would handle the e-mail sending.
Are there any smart and/or reasonably easy ways of sending e-mails using the开发者_开发技巧 Java Core packages?
Thanks :)
Mike.
You can -- by opening a socket to the smtp server and then writing to that socket.
Socket socket=new Socket("your.smtp.server",25);
br= new BufferedReader(newInputStreamReader(socket.getInputStream()));
os = socket.getOutputStream();
smtp("HELLO " + toEmailAddress);
smtp("MAIL FROM: "+ fromEmailAddress);
smtp("DATA");
smtp(yourContent");
and your smtp method would just read from the bufferedreader and write to socket
public void smtp(String command) {
br.readLine();
os.write(command.getBytes());
}
Here is some old code I had lying around that might get you started:
import java.io.*;
import java.net.*;
class EMail2
{
public static void main(String args[])
{
if ( args.length != 5 )
{
System.out.print("usage: java EMail2 <smtp-host> <fromName> <toAddress>");
System.out.println(" <subject> <body>");
System.exit(-1);
}
try
{
send(args[0], args[1], args[2], args[3], args[4]);
}
catch(Exception e)
{
e.printStackTrace();
}
System.exit(0);
}
public static void send(String host, String from, String to, String subject, String message)
{
try
{
System.setProperty("mail.host", host);
// System.setProperty("mail.smtp.starttls.enable","true"); // not sure it this works or not
// open connection using java.net internal "mailto" protocol handler
URL url = new URL("mailto:" + to);
URLConnection conn = url.openConnection();
conn.connect();
// get writer into the stream
PrintWriter out = new PrintWriter(new OutputStreamWriter(conn.getOutputStream() ) );
// write out mail headers
// From header in the form From: "alias" <email>
out.println("From: \"" + from + "\" <" + from + ">");
out.println("To: " + to);
out.println("Subject: " + subject);
out.println(); // blank line to end the list of headers
// write out the message
out.println(message);
// close the stream to terminate the message
out.close();
}
catch(Exception err)
{
System.err.println(err);
}
}
}
加载中,请稍侯......
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