JavaMail Send message instance with attachment in Java

Mail.java Code

The code is as follows

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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

The code is as follows	Copy Code
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 messages sent to 163 are all signed with an attachment, whether or not the attachment is sent