Send mail via javamail. I will understand it after reading it.

/** RecieveMail. java ** Created on 2008.7.9, pm2: 40 ** To change this template, choose Tools | Template Manager * and open the template in the editor. */package mail; import javax. mail. *; import javax. mail. internet. *; import java. util. *; import java. io. *; /***** @ author user ** generate zookeeper token when generating zookeeper, Zookeeper, and zookeeper. extends extends */public class RecieveMail {private String _ popServer = ""; Private String _ popUser = ""; private String _ popPassword = ""; public void getMails () {try {// recieve mail receive ();} catch (Exception ex) {Logger. println ("Usage: java com. lotontech. mail. POPMail "+" popServer popUser popPassword ") ;}} private void receive () {Store store = null; Folder folder = null; try {// prepare to open mails pool Properties props = System. getProperties (); Session session = Session. getDefaultInstance (props, null); store = session. getStore ("pop3"); store. connect (_ popServer, _ popUser, _ popPassword); folder = store. getDefaultFolder (); if (folder = null) throw new Exception ("No default folder"); folder = folder. getFolder ("INBOX"); if (folder = null) throw new Exception ("No POP3 INBOX"); // inbox folder // make it writeable folder. open (Folder. READ_WRITE); // array mails I N msgs Message [] msgs = folder. getMessages (); for (int msgNum = 0; msgNum <msgs. length; msgNum ++) {// read mail Logger. println ("this the" + (msgNum + 1) + "mail in the server INBOX"); printMessage (msgs [msgNum]); checkMessage (msgs [msgNum]); // delete readen mail msgs [msgNum]. setFlag (Flags. flag. DELETED, true) ;}} catch (Exception ex) {Logger. println (ex. getMessage ();} finally {try {// set true to af Firm the operation if (folder! = Null) folder. close (true); if (store! = Null) store. close ();} catch (Exception ex2) {Logger. println (ex2.getMessage () ;}} private void printMessage (Message message) {try {Logger. println ("mail info ------ start ------"); // from address String from = (InternetAddress) message. getFrom () [0]). getPersonal (); if (from = null) from = (InternetAddress) message. getFrom () [0]). getAddress (); Logger. println ("FROM:" + from); // subject String subject = messa Ge. getSubject (); Logger. println ("SUBJECT:" + subject); // headers String [] header = message. getHeader ("X-IFArea"); if (header. length> 0) Logger. println ("X-IFArea:" + header [0]); // content Part messagePart = message; Object content = messagePart. getContent (); if (content instanceof Multipart) {for (int m = 0; m <(Multipart) content ). getCount (); m ++) {if (Multipart) content ). getBodyPart (m ). getFileName ()! = Null) {Logger. println ("affix:" + (Multipart) content ). getBodyPart (m ). getFileName () ;}} Logger. println ("mail info ------ end ------");} catch (Exception ex) {Logger. println (ex. getMessage () ;}} private void checkMessage (Message message) {try {// subject String subject = message. getSubject (); // headers String [] header = message. getHeader ("X-IFArea"); if (header. length <1) throw new Exception ("mail ch Eck error, there is no X-IFArea "); String x_IFArea = header [0]; // error reports List x_err_IFAreas = new ArrayList (); for (int I = 1; I <= 3; I ++) {String [] error = message. getHeader ("X-Ex" + I + "-IFArea"); if (error! = Null & error. length> 0) x_err_IFAreas.add ("X-Ex" + I + "-IFArea" + error [0]);} // content Part messagePart = message; Object content = messagePart. getContent (); List files = new ArrayList (); if (content instanceof Multipart) {for (int fileNumber = 0; fileNumber <(Multipart) content ). getCount (); fileNumber ++) {messagePart = (Multipart) content ). getBodyPart (fileNumber); if (messagePart. getFileName () = null) continue; BlobData data = new BlobData (); data. setBlobName (messagePart. getFileName (); data. setStream (messagePart. getInputStream (); files. add (data) ;}// create TransmitIncepters to deal the message String className = ""; Property property Property = Property. getInstance (); // if (subject. equalsIgnoreCase (property. getProperty ("titleRegist "). trim () {className = CONSTANT. mail_class_Regist;} else if (subject. equalsIgnoreCase (property. getProperty ("titleDeleteRegist "). trim () {className = CONSTANT. mail_class_DeleteRegist;} else if (subject. equalsIgnoreCase (property. getProperty ("titleAccept "). trim () {className = CONSTANT. mail_class_Accept;} else {throw new Exception ("wrong title, can not incept the mail to db");} // desine for only get the name from subject string TransmitIncepter incepter = TransmitIncepter. getInstance (className); incepter. setSubject (subject); incepter. setX_IFArea (x_IFArea); incepter. setX_err_IFAreaList (x_err_IFAreas); incepter. setFileList (files); incepter. setSentDate (message. getSentDate (); incepter. run ();} catch (Exception ex) {Logger. println (ex. getMessage () ;}} public void setPopServer (String popServer) {_ popServer = popServer;} public void setPopUser (String popUser) {_ popUser = popUser ;} public void setPopPassword (String popPassword) {_ popPassword = popPassword ;}}
/** SendMail. java ** Created on 2008.7.9, am11: 47 ** To change this template, choose Tools | Template Manager * and open the template in the editor. */package mail; import java. util. *; import javax. mail. *; import javax. mail. internet. *; import java. util. date; import javax. activation. *; import oracle. SQL. BLOB; import java. io. *; public class SendMail {private MimeMessage mimeMsg; private Session session; Private Properties props; // your desired region has been private boolean needAuth = false; // smtp token has been used when your desired region has been encrypted using private String username = ""; // smtp authentication name private String password = ""; // smtp authentication using encrypted private Multipart mp; // The Multipart authentication image contains the following content, table topic: Add a parameter containing the parameter MimeMessage photo image/******/public SendMail () {setSmtpHost (""); // Please specify whether or not the specified parameter has been specified, and whether or not the specified parameter has been specified before using createmememessage ();} public SendMail (String smtp) {setSmtpHost (smtp); createMim EMessage ();}/***** @ param hostName String **/public void setSmtpHost (String hostName) {Logger. println ("system property: mail. smtp. host = "+ hostName); if (props = null) props = System. getProperties. put ("mail. smtp. host ", hostName); // SMTP reschedule register name}/***** @ return boolean **/public boolean createMimeMessage () {try {Logger. println ("prepare to read mail body object"); se Ssion = Session. getDefaultInstance (props, null); // catch (Exception e) {System. err. println ("error ecured in getting mail body" + e); return false;} Logger. println ("create mime mail body! "); Try {mimeMsg = new MimeMessage (session); // create an mp = new MimeMultipart (); return true;} catch (Exception e) {System. err. println ("fail to create mime body" + e); return false ;}/ ***** @ param need boolean ***/public void setNeedAuth (boolean need) {Logger. println ("config smtp auth: mail. smtp. auth = "+ need); if (props = null) props = System. getProperties (); if (need) {props. put ("mai L. smtp. auth "," true ");} else {props. put ("mail. smtp. auth "," false ") ;}}/***** @ param name String ** @ param pass String ***/public void setNamePass (String name, String pass) {username = name; password = pass;}/***** @ param mailSubject String ** @ return boolean **/public boolean setSubject (String mailSubject) {Logger. println ("config mail subject"); try {mimeMsg. setSubject (mailSubject); Return true;} catch (Exception e) {System. err. println ("fail to config mail subject"); return false ;}/ ***** @ param mailSubject String *** @ return boolean ***/public boolean setHeader (String name, string context) {Logger. println ("config mail header:" + name); try {mimeMsg. setHeader (name, context); return true;} catch (Exception e) {System. err. println ("fail to config mail header"); retu Rn false;}/***** @ param mailBody String **/public boolean setBody (String mailBody) {try {BodyPart bp = new MimeBodyPart (); bp. setContent ("<meta http-equiv = Content-Type content = text/html; charset = iso-2022-jp>" + mailBody, "text/html; charset = iso-2022-jp"); mp. addBodyPart (bp); return true;} catch (Exception e) {System. err. println ("config mail main body" + e); return false ;}} public bool Ean addFileAffix (String filename, BLOB blob) {Logger. println ("add file affix:" + filename); try {BodyPart bp = new MimeBodyPart (); BlobDataSource streamds = new BlobDataSource (filename, blob); bp. setDataHandler (new DataHandler (streamds); bp. setFileName (streamds. getName (); bp. setHeader ("Content-Transfer-Encoding", "base64"); mp. addBodyPart (bp); return true;} catch (Exception e) {System. err. print Ln ("add file affix:" + filename + "error ecured" + e); return false ;}} public boolean addFileAffix (String filename) {Logger. println ("add file affix:" + filename); try {BodyPart bp = new MimeBodyPart (); FileDataSource fileds = new FileDataSource (filename); bp. setDataHandler (new DataHandler (fileds); bp. setFileName (fileds. getName (); mp. addBodyPart (bp); return true;} catch (Exception e) {Syst Em. err. println ("add file affix:" + filename + "error ecured" + e); return false ;}} public boolean addFileAffix (BlobData [] blobs) {try {for (int I = 0; I <blobs. length; I ++) {Logger. println ("add file affix:" + blobs [I]. getBlobName (); BodyPart bp = new MimeBodyPart (); BlobDataSource streamds = new BlobDataSource (blobs [I]. getBlobName (), blobs [I]. getBlob (); bp. setDataHandler (new DataHandler (stre Amds); bp. setFileName (streamds. getName (); mp. addBodyPart (bp);} return true;} catch (Exception e) {System. err. println ("add file affix, error ecured" + e); return false ;}} /***** @ param name String ** @ param pass String **/public boolean setFrom (String from) {Logger. println ("set fromer! "); Try {mimeMsg. setFrom (new InternetAddress (from); // the sender of the message must have been successfully set to return true;} catch (Exception e) {return false ;}} /***** @ param name String ** @ param pass String **/public boolean setTo (String to) {if (to = null) return false; try {mimeMsg. setRecipients (Message. recipientType. TO, InternetAddress. parse (to); return true;} catch (Exception e) {return false;}/*** @ param name S Tring ** @ param pass String **/public boolean setCopyTo (String copyto) {if (copyto = null) return false; try {mimeMsg. setRecipients (Message. recipientType. CC, (Address []) InternetAddress. parse (copyto); return true;} catch (Exception e) {return false ;}} /***** @ param name String ** @ param pass String **/public boolean sendout () {try {mimeMsg. setContent (mp); mimeMsg. saveChanges (); L Ogger. println ("sending mail .... "); Session mailSession = Session. getInstance (props, null); Transport transport = mailSession. getTransport ("smtp"); transport. connect (String) props. get ("mail. smtp. host "), username, password); transport. sendMessage (mimeMsg, mimeMsg. getRecipients (Message. recipientType. TO); // transport. send (mimeMsg); Logger. println ("sending mail succeed! "); Transport. close (); return true;} catch (Exception e) {System. err. println (" Fail to send mail! "+ E); return false ;}}}
 
 
When receiving mail attachments, it applies to the input stream. Here, it is easy to generate unnecessary things. When reading the input stream, it is best to use while (int = in. read ())! =-1) to receive the actual length, otherwise the file will be added with some inexplicable spaces.