/*
在java版经常看到有人问如何用javamail发送邮件？如何接收邮件？如何访问多个文件夹等。问题零散，而历史的回复早已经淹没在问题的海洋之中。

本人之前所做过一个java项目，其中包含有WebMail功能，当初为用java实现而对javamail摸索了一段时间，总算有点收获。看到论坛中的经常有此方面的问题，因此把我的一些经验帖出来，希望对大家有些帮助。

此篇仅介绍用javamail实现发送邮件功能，其中涉及smtp认证，邮件附件发送，及HTML内容邮件等。
其它有关多邮箱的实现，接收POP3邮件及IMAP等内容，将在后续文章中介绍。

如下程序需要：javamail，JAF包，j2ee.jar包含了上述两个包，建议大家安装J2SDKEE或直接拷贝j2ee.jar，将其添加到jbuilder的library中，或系统ClassPath中

*/

package com.me.util.mail;

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;
import java.util.Date;
import javax.activation.*;
import java.io.*;
import com.me.util.*;

public class sendMail {

private MimeMessage mimeMsg; //MIME邮件对象

private Session session; //邮件会话对象
private Properties props; //系统属性
private boolean needAuth = false; //smtp是否需要认证

private String username = ""; //smtp认证用户名和密码
private String password = "";

private Multipart mp; //Multipart对象,邮件内容,标题,附件等内容均添加到其中后再生成MimeMessage对象



/**
*
*/
public sendMail() {
setSmtpHost(getConfig.mailHost);//如果没有指定邮件服务器,就从getConfig类中获取
createMimeMessage();
}

public sendMail(String smtp){
setSmtpHost(smtp);
createMimeMessage();
}



/**
* @param hostName String
*/
public void setSmtpHost(String hostName) {
System.out.println("设置系统属性：mail.smtp.host = "+hostName);
if(props == null)props = System.getProperties(); //获得系统属性对象

props.put("mail.smtp.host",hostName); //设置SMTP主机
}


/**
* @return boolean
*/
public boolean createMimeMessage()
{
try{
System.out.println("准备获取邮件会话对象！";
session = Session.getDefaultInstance(props,null); //获得邮件会话对象
}
catch(Exception e){
System.err.println("获取邮件会话对象时发生错误！"+e);
return false;
}

System.out.println("准备创建MIME邮件对象！";
try{
mimeMsg = new MimeMessage(session); //创建MIME邮件对象
mp = new MimeMultipart();

return true;
}
catch(Exception e){
System.err.println("创建MIME邮件对象失败！"+e);
return false;
}
}



/**
* @param need boolean
*/
public void setNeedAuth(boolean need) {
System.out.println("设置smtp身份认证：mail.smtp.auth = "+need);
if(props == null)props = System.getProperties();

if(need){
props.put("mail.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) {
System.out.println("设置邮件主题！";
try{
mimeMsg.setSubject(mailSubject);
return true;
}
catch(Exception e) {
System.err.println("设置邮件主题发生错误！";
return 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=gb2312>"+mailBody,"text/html;charset=GB2312";
mp.addBodyPart(bp);

return true;
}
catch(Exception e){
System.err.println("设置邮件正文时发生错误！"+e);
return false;
}
}


/**
* @param name String
* @param pass String
*/
public boolean addFileAffix(String filename) {

System.out.println("增加邮件附件："+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){
System.err.println("增加邮件附件："+filename+"发生错误！"+e);
return false;
}
}



/**
* @param name String
* @param pass String
*/
public boolean setFrom(String from) {
System.out.println("设置发信人！";
try{
mimeMsg.setFrom(new InternetAddress(from)); //设置发信人
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 String
* @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();
System.out.println("正在发送邮件....";

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);

System.out.println("发送邮件成功！";
transport.close();

return true;
}
catch(Exception e)
{
System.err.println("邮件发送失败！"+e);
return false;
}
}


/**
* Just do it as this
*/
public static void main(String[] args) {

String mailbody = "<meta http-equiv=Content-Type content=text/html; charset=gb2312>"+
"<div align=center><a href=http://www.4ico.com> csdn </a></div>";

sendMail themail = new sendMail("smtp.msn.com";
themail.setNeedAuth(true);

if(themail.setSubject("标题" == false) return;
if(themail.setBody(mailbody) == false) return;
if(themail.setTo("gates@msn.com" == false) return;
if(themail.setFrom("bill@msn.com" == false) return;
if(themail.addFileAffix("c:\\boot.ini" == false) return;
themail.setNamePass("user","password";

if(themail.sendout() == false) return;
}
}