This article gives an example of how the JavaMail sends a message with attachments in Java. Share to everyone for your reference. The specific analysis is as follows:
JavaMail, as the name suggests, provides a programming interface for developers to work with e-mail. It's a sun-released API for handling emails. It can easily perform some of the most commonly used mail transmissions, JavaMail is optional, so if you need to use it, you need to download it first from the Java official web site. Currently the latest version is JavaMail1.5.0, let's look at the JavaMail send a message with an attachment instance
Mail.java Code:
Copy Code code as follows:
Package mail;
Import java.util.*;
Import java.io.*;
Import javax.mail.*;
Import javax.mail.internet.*;
Import javax.activation.*;
public class Mail {
Define sender, recipient, SMTP server, user name, password, subject, content, etc.
Private String DisplayName;
Private String to;
Private String from;
Private String SmtpServer;
Private String username;
private String password;
Private String subject;
Private String content;
Private Boolean Ifauth; Whether the server wants authentication
Private String filename= "";
Private vector file = new vector (); A collection of file names used to save send attachments
/**
* Set SMTP server address
*/
public void Setsmtpserver (String smtpserver) {
This.smtpserver=smtpserver;
}
/**
* Set the sender's address
*/
public void Setfrom (String from) {
This.from=from;
}
/**
* Set the display name
*/
public void Setdisplayname (String displayName) {
This.displayname=displayname;
}
/**
* Set whether the server requires identity authentication
*/
public void Setifauth (Boolean Ifauth) {
This.ifauth=ifauth;
}
/**
* Set e-mail user name
*/
public void Setusername (String username) {
This.username=username;
}
/**
* Set e-mail password
*/
public void SetPassword (String password) {
This.password=password;
}
/**
* Set Receiver
*/
public void Setto (String to) {
This.to=to;
}
/**
* Set Theme
*/
public void Setsubject (String subject) {
This.subject=subject;
}
/**
* Set Body Content
*/
public void SetContent (String content) {
This.content=content;
}
/**
* This method is used to collect attachment names
*/
public void Addattachfile (String fname) {
File.addelement (fname);
}
Public Mail () {
}
/**
* Initialize SMTP server address, sender e-mail address, username, password, receiver, subject, content
*/
Public Mail (String smtpserver,string from,string displayname,string username,string password,string to,String subject, String content) {
This.smtpserver=smtpserver;
This.from=from;
This.displayname=displayname;
This.ifauth=true;
This.username=username;
This.password=password;
This.to=to;
This.subject=subject;
This.content=content;
}
/**
* Initialize SMTP server address, sender e-mail address, receiver, subject, content
*/
Public Mail (String smtpserver,string from,string displayname,string to,string subject,string content) {
This.smtpserver=smtpserver;
This.from=from;
This.displayname=displayname;
This.ifauth=false;
This.to=to;
This.subject=subject;
This.content=content;
}
/**
* Send mail
*/
Public HashMap Send () {
HashMap map=new HashMap ();
Map.put ("state", "success");
String message= "message sent successfully!" ";
Session Session=null;
Properties props = System.getproperties ();
Props.put ("Mail.smtp.host", smtpserver);
if (Ifauth) {//server requires identity authentication
Props.put ("Mail.smtp.auth", "true");
Smtpauth smtpauth=new Smtpauth (Username,password);
Session=session.getdefaultinstance (props, Smtpauth);
}else{
Props.put ("Mail.smtp.auth", "false");
Session=session.getdefaultinstance (props, null);
}
Session.setdebug (TRUE);
Transport trans = null;
try {
msg = new MimeMessage (session);
try{
Address from_address = new InternetAddress (from, displayName);
Msg.setfrom (from_address);
}catch (Java.io.UnsupportedEncodingException e) {
E.printstacktrace ();
}
Internetaddress[] Address={new internetaddress (To)};
Msg.setrecipients (message.recipienttype.to,address);
Msg.setsubject (subject);
Multipart MP = new Mimemultipart ();
MimeBodyPart MBP = new MimeBodyPart ();
Mbp.setcontent (Content.tostring (), "text/html;charset=gb2312");
Mp.addbodypart (MBP);
if (!file.isempty ()) {//have attachments
Enumeration efile=file.elements ();
while (Efile.hasmoreelements ()) {
Mbp=new MimeBodyPart ();
Filename=efile.nextelement (). toString (); Select each attachment name
Filedatasource fds=new filedatasource (filename); Get the data source
Mbp.setdatahandler (New DataHandler (FDS)); Get the attachment itself and into the bodypart
Mbp.setfilename (Fds.getname ()); Get file name same to enter BodyPart
Mp.addbodypart (MBP);
}
File.removeallelements ();
}
Msg.setcontent (MP); Multipart joined the letter
Msg.setsentdate (New Date ()); Set the date the letter header was sent
Send a letter
Msg.savechanges ();
trans = Session.gettransport ("SMTP");
Trans.connect (smtpserver, username, password);
Trans.sendmessage (MSG, msg.getallrecipients ());
Trans.close ();
}catch (Authenticationfailedexception e) {
Map.put ("state", "failed");
Message= "message sent failed! Error reason: \ n "+" Authentication Error! ";
E.printstacktrace ();
}catch (Messagingexception e) {
Message= "message sent failed! Error reason: \ n "+e.getmessage" ();
Map.put ("state", "failed");
E.printstacktrace ();
Exception ex = null;
if (ex = E.getnextexception ())!= null) {
System.out.println (Ex.tostring ());
Ex.printstacktrace ();
}
}
System.out.println ("\ n prompt information:" +message);
Map.put ("message", message);
return map;
}
}
Smtpauth.java Code:
Copy Code code as follows:
Package mail;
public class Smtpauth extends Javax.mail.Authenticator {
Private String Username,password;
Public Smtpauth (String username,string password) {
This.username = Username;
This.password = password;
}
Protected Javax.mail.PasswordAuthentication getpasswordauthentication () {
return new Javax.mail.PasswordAuthentication (Username,password);
}
}
The problem is that the message sent to 163 with an attachment symbol, whether or not to send attachments, interested friends can be improved and perfected.
I hope this article will help you with your Java programming.
