java 发送电子邮件实现实例

需要activation.jar和mail.jar  两个jar包

1.Demo.java   邮件发送控制类

package zzb.test;

import cn.cgw.util.mail.Mail;
/**
 * 发送邮件的main
 * @author zhao
 *
 */
public class Demo {

public static void main(String[] args){
String smtp = "smtp.126.com";//SMTP服务器
String from = "[email protected]";//发信人
String to = "[email protected]";//收信人
String copyto = "[email protected]";//抄送人
String subject = "好好学习";//邮件主题
String content = "来自你二大爷";//邮件内容
String username="zhao_zi_bo";//用户名
String password="scw1234";//密码
String filename = "H:\\学习\\表情包.zip";//附件路径，如：F:\\笔记\\struts2与mvc.txt
Mail.sendAndCc(smtp, from, to, copyto, subject, content, username, password, filename);
}

}

2.为邮件发送提供接口的类Mail.java

package cn.cgw.util.mail;


import java.util.Properties;


import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Address;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;




public class Mail { 


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 
//smtp认证用户名和密码 
private String username; 
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 
 
/**
* Constructor
* @param smtp 邮件发送服务器
*/
public Mail(String smtp){ 
setSmtpHost(smtp); 
createMimeMessage(); 
} 


/**
* 设置邮件发送服务器
* @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 
} 




/**
* 创建MIME邮件对象  
* @return
*/
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; 
} 
}

/**
* 设置SMTP是否需要验证
* @param need
*/
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"); 
} 
} 


/**
* 设置用户名和密码
* @param name
* @param pass
*/
public void setNamePass(String name,String pass) { 
username = name; 
password = pass; 
} 


/**
* 设置邮件主题
* @param mailSubject
* @return
*/
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; 
} 
}

/** 
* 设置邮件正文
* @param mailBody String 
*/ 
public boolean setBody(String mailBody) { 
try{ 
BodyPart bp = new MimeBodyPart(); 
bp.setContent(""+mailBody,"text/html;charset=GBK"); 
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; 
} 
} 
/** 
* 添加附件
* @param filename 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; 
} 
} 

/** 
* 设置发信人
* @param from 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; 
} 
} 
/** 
* 设置收信人
* @param to 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; 
}
} 

/** 
* 设置抄送人
* @param copyto 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; } 
} 

/** 
* 发送邮件
*/ 
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.sendMessage(mimeMsg,mimeMsg.getRecipients(Message.RecipientType.CC)); 
//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; 
} 
} 


/**
* 调用sendOut方法完成邮件发送
* @param smtp
* @param from
* @param to
* @param subject
* @param content
* @param username
* @param password
* @return boolean
*/
public static boolean send(String smtp,String from,String to,String subject,String content,String username,String password) {
Mail theMail = new Mail(smtp);
theMail.setNeedAuth(true); //需要验证

if(!theMail.setSubject(subject)) return false;
if(!theMail.setBody(content)) return false;
if(!theMail.setTo(to)) return false;
if(!theMail.setFrom(from)) return false;
theMail.setNamePass(username,password);

if(!theMail.sendOut()) return false;
return true;
}

/**
* 调用sendOut方法完成邮件发送,带抄送
* @param smtp
* @param from
* @param to
* @param copyto
* @param subject
* @param content
* @param username
* @param password
* @return boolean
*/
public static boolean sendAndCc(String smtp,String from,String to,String copyto,String subject,String content,String username,String password) {
Mail theMail = new Mail(smtp);
theMail.setNeedAuth(true); //需要验证

if(!theMail.setSubject(subject)) return false;
if(!theMail.setBody(content)) return false;
if(!theMail.setTo(to)) return false;
if(!theMail.setCopyTo(copyto)) return false;
if(!theMail.setFrom(from)) return false;
theMail.setNamePass(username,password);

if(!theMail.sendOut()) return false;
return true;
}

/**
* 调用sendOut方法完成邮件发送,带附件
* @param smtp
* @param from
* @param to
* @param subject
* @param content
* @param username
* @param password
* @param filename 附件路径
* @return
*/
public static boolean send(String smtp,String from,String to,String subject,String content,String username,String password,String filename) {
Mail theMail = new Mail(smtp);
theMail.setNeedAuth(true); //需要验证

if(!theMail.setSubject(subject)) return false;
if(!theMail.setBody(content)) return false;
if(!theMail.addFileAffix(filename)) return false; 
if(!theMail.setTo(to)) return false;
if(!theMail.setFrom(from)) return false;
theMail.setNamePass(username,password);

if(!theMail.sendOut()) return false;
return true;
}

/**
* 调用sendOut方法完成邮件发送,带附件和抄送
* @param smtp
* @param from
* @param to
* @param copyto
* @param subject
* @param content
* @param username
* @param password
* @param filename
* @return
*/
public static boolean sendAndCc(String smtp,String from,String to,String copyto,String subject,String content,String username,String password,String filename) {
Mail theMail = new Mail(smtp);
theMail.setNeedAuth(true); //需要验证

if(!theMail.setSubject(subject)) return false;
if(!theMail.setBody(content)) return false;
if(!theMail.addFileAffix(filename)) return false; 
if(!theMail.setTo(to)) return false;
if(!theMail.setCopyTo(copyto)) return false;
if(!theMail.setFrom(from)) return false;
theMail.setNamePass(username,password);

if(!theMail.sendOut()) return false;
return true;
}

}