JavaMail发送邮件

1.首先建立一个web工程

2.编写代码：第一个类MailSenderInfo.java 

package com.onlyfun.JavaEmail;

/** 
* 发送邮件需要使用的基本信息 
*/ 
import java.util.Properties; 
public class MailSenderInfo { 
	// 发送邮件的服务器的IP和端口 
	private String mailServerHost; 
	private String mailServerPort = "25"; 
	// 邮件发送者的地址 
	private String fromAddress; 
	// 邮件接收者的地址 
	private String toAddress; 
	// 登陆邮件发送服务器的用户名和密码 
	private String userName; 
	private String password; 
	// 是否需要身份验证 
	private boolean validate = false; 
	// 邮件主题 
	private String subject; 
	// 邮件的文本内容 
	private String content; 
	// 邮件附件的文件名 
	private String[] attachFileNames; 	
	/** 
	  * 获得邮件会话属性 
	  */ 
	public Properties getProperties(){ 
	  Properties p = new Properties(); 
	  p.put("mail.smtp.host", this.mailServerHost); 
	  p.put("mail.smtp.port", this.mailServerPort); 
	  p.put("mail.smtp.auth", validate ? "true" : "false"); 
	  return p; 
	} 
	public String getMailServerHost() { 
	  return mailServerHost; 
	} 
	public void setMailServerHost(String mailServerHost) { 
	  this.mailServerHost = mailServerHost; 
	}
	public String getMailServerPort() { 
	  return mailServerPort; 
	}
	public void setMailServerPort(String mailServerPort) { 
	  this.mailServerPort = mailServerPort; 
	}
	public boolean isValidate() { 
	  return validate; 
	}
	public void setValidate(boolean validate) { 
	  this.validate = validate; 
	}
	public String[] getAttachFileNames() { 
	  return attachFileNames; 
	}
	public void setAttachFileNames(String[] fileNames) { 
	  this.attachFileNames = fileNames; 
	}
	public String getFromAddress() { 
	  return fromAddress; 
	} 
	public void setFromAddress(String fromAddress) { 
	  this.fromAddress = fromAddress; 
	}
	public String getPassword() { 
	  return password; 
	}
	public void setPassword(String password) { 
	  this.password = password; 
	}
	public String getToAddress() { 
	  return toAddress; 
	} 
	public void setToAddress(String toAddress) { 
	  this.toAddress = toAddress; 
	} 
	public String getUserName() { 
	  return userName; 
	}
	public void setUserName(String userName) { 
	  this.userName = userName; 
	}
	public String getSubject() { 
	  return subject; 
	}
	public void setSubject(String subject) { 
	  this.subject = subject; 
	}
	public String getContent() { 
	  return content; 
	}
	public void setContent(String textContent) { 
	  this.content = textContent; 
	} 
} 

 第二个类：SimpleMailSender.java 

package com.util.mail;

import java.util.Date; 
import java.util.Properties;
import javax.mail.Address; 
import javax.mail.BodyPart; 
import javax.mail.Message; 
import javax.mail.MessagingException; 
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; 

/** 
* 简单邮件（不带附件的邮件）发送器 
*/ 
public class SimpleMailSender  { 
/** 
  * 以文本格式发送邮件 
  * @param mailInfo 待发送的邮件的信息 
  */ 
	public boolean sendTextMail(MailSenderInfo mailInfo) { 
	  // 判断是否需要身份认证 
	  MyAuthenticator authenticator = null; 
	  Properties pro = mailInfo.getProperties();
	  if (mailInfo.isValidate()) { 
	  // 如果需要身份认证，则创建一个密码验证器 
		authenticator = new MyAuthenticator(mailInfo.getUserName(), mailInfo.getPassword()); 
	  }
	  // 根据邮件会话属性和密码验证器构造一个发送邮件的session 
	  Session sendMailSession = Session.getDefaultInstance(pro,authenticator); 
	  try { 
	  // 根据session创建一个邮件消息 
	  Message mailMessage = new MimeMessage(sendMailSession); 
	  // 创建邮件发送者地址 
	  Address from = new InternetAddress(mailInfo.getFromAddress()); 
	  // 设置邮件消息的发送者 
	  mailMessage.setFrom(from); 
	  // 创建邮件的接收者地址，并设置到邮件消息中 
	  Address to = new InternetAddress(mailInfo.getToAddress()); 
	  mailMessage.setRecipient(Message.RecipientType.TO,to); 
	  // 设置邮件消息的主题 
	  mailMessage.setSubject(mailInfo.getSubject()); 
	  // 设置邮件消息发送的时间 
	  mailMessage.setSentDate(new Date()); 
	  // 设置邮件消息的主要内容 
	  String mailContent = mailInfo.getContent(); 
	  mailMessage.setText(mailContent); 
	  // 发送邮件 
	  Transport.send(mailMessage);
	  return true; 
	  } catch (MessagingException ex) { 
		  ex.printStackTrace(); 
	  } 
	  return false; 
	} 
	
	/** 
	  * 以HTML格式发送邮件 
	  * @param mailInfo 待发送的邮件信息 
	  */ 
	public static boolean sendHtmlMail(MailSenderInfo mailInfo){ 
	  // 判断是否需要身份认证 
	  MyAuthenticator authenticator = null;
	  Properties pro = mailInfo.getProperties();
	  //如果需要身份认证，则创建一个密码验证器  
	  if (mailInfo.isValidate()) { 
		authenticator = new MyAuthenticator(mailInfo.getUserName(), mailInfo.getPassword());
	  } 
	  // 根据邮件会话属性和密码验证器构造一个发送邮件的session 
	  Session sendMailSession = Session.getDefaultInstance(pro,authenticator); 
	  try { 
	  // 根据session创建一个邮件消息 
	  Message mailMessage = new MimeMessage(sendMailSession); 
	  // 创建邮件发送者地址 
	  Address from = new InternetAddress(mailInfo.getFromAddress()); 
	  // 设置邮件消息的发送者 
	  mailMessage.setFrom(from); 
	  // 创建邮件的接收者地址，并设置到邮件消息中 
	  Address to = new InternetAddress(mailInfo.getToAddress()); 
	  // Message.RecipientType.TO属性表示接收者的类型为TO 
	  mailMessage.setRecipient(Message.RecipientType.TO,to); 
	  // 设置邮件消息的主题 
	  mailMessage.setSubject(mailInfo.getSubject()); 
	  // 设置邮件消息发送的时间 
	  mailMessage.setSentDate(new Date()); 
	  // MiniMultipart类是一个容器类，包含MimeBodyPart类型的对象 
	  Multipart mainPart = new MimeMultipart(); 
	  // 创建一个包含HTML内容的MimeBodyPart 
	  BodyPart html = new MimeBodyPart(); 
	  // 设置HTML内容 
	  html.setContent(mailInfo.getContent(), "text/html; charset=utf-8"); 
	  mainPart.addBodyPart(html); 
	  // 将MiniMultipart对象设置为邮件内容 
	  mailMessage.setContent(mainPart); 
	  // 发送邮件 
	  Transport.send(mailMessage); 
	  return true; 
	  } catch (MessagingException ex) { 
		  ex.printStackTrace(); 
	  } 
	  return false; 
	} 
} 

 第三个类：MyAuthenticator.java 

package com.util.mail;

import javax.mail.*;
  
public class MyAuthenticator extends Authenticator{
	String userName=null;
	String password=null;
	 
	public MyAuthenticator(){
	}
	public MyAuthenticator(String username, String password) { 
		this.userName = username; 
		this.password = password; 
	} 
	protected PasswordAuthentication getPasswordAuthentication(){
		return new PasswordAuthentication(userName, password);
	}
}
 

 下面给出使用上面三个类的测试代码：

public static void main(String[] args){
         //这个类主要是设置邮件
	  MailSenderInfo mailInfo = new MailSenderInfo(); 
	  mailInfo.setMailServerHost("smtp.163.com"); 
	  mailInfo.setMailServerPort("25"); 
	  mailInfo.setValidate(true); 
	  mailInfo.setUserName("[email protected]"); 
	  mailInfo.setPassword("**********");//您的邮箱密码 
	  mailInfo.setFromAddress("[email protected]"); 
	  mailInfo.setToAddress("[email protected]"); 
	  mailInfo.setSubject("设置邮箱标题"); 
	  mailInfo.setContent("设置邮箱内容"); 
         //这个类主要来发送邮件
	  SimpleMailSender sms = new SimpleMailSender();
          sms.sendTextMail(mailInfo);//发送文体格式 
          sms.sendHtmlMail(mailInfo);//发送html格式
	}

 

别着急，可能你在运行的时候会报

Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/mail/util

 原因是jar包不统一的缘故，即架包冲突；

删除Java EE 5 Libraries/javaee.jar/mail里的包有东西即可解决问题
具体方法如下:
用rar打开X:/Program Files/MyEclipse 6.0/myeclipse/eclipse/plugins/com.genuitec.eclipse.j2eedt.core_6.0.1.zmyeclipse601200710/data/libraryset/EE_5/javaee.jar
,然后删除mail,最后再重新导入mail.jar就可以正常发送了