java实现邮件发送

一.第一步:导入两个jar包。

     activation.jar  和 mail.jar,            一定要添加到构建路径(不然找不到包)

两个用于Java发送邮件的jar包-Java文档类资源-优快云下载

二、创建邮箱工具类:Mail.java

import java.util.*;
import java.io.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;

public class Mail {

	String to = "";// 收件邮箱
	String from = "";// 发件邮箱
	String host = "";// smtp主机   服务器地址         
	String username = "";   //登录服务器校验用户
	String password = "";   //登录服务器校验密码
	String filename = "";// 附件文件名
	String subject = "";// 邮件主题
	String content = "";// 邮件正文
	Vector file = new Vector();// 附件文件集合
	
	
	public Mail() {
	}

	//构造器，提供直接的参数传入
	public Mail(String to, String from, String smtpServer, String username, String password, String subject,
			String content) {
		this.to = to;
		this.from = from;
		this.host = smtpServer;
		this.username = username;
		this.password = password;
		this.subject = subject;
		this.content = content;
	}

	//设置邮件服务器地址
	public void setHost(String host) {
		this.host = host;
	}

	//设置登录服务器校验密码
	public void setPassWord(String pwd) {
		this.password = pwd;
	}

	//设置登录服务器校验用户
	public void setUserName(String usn) {
		this.username = usn;
	}

	//设置邮件发送目的邮箱
	public void setTo(String to) {
		this.to = to;
	}

	//设置邮件发送源邮箱
	public void setFrom(String from) {
		this.from = from;
	}

	//设置邮件主题
	public void setSubject(String subject) {
		this.subject = subject;
	}

	//设置邮件内容
	public void setContent(String content) {
		this.content = content;
	}

	//把主题转换为中文
	public String transferChinese(String strText) {
		try {
			strText = MimeUtility.encodeText(new String(strText.getBytes(), "GB2312"), "GB2312", "B");
		} catch (Exception e) {
			e.printStackTrace();
		}
		return strText;
	}

	//往附件组合中添加附件
	public void attachfile(String fname) {
		file.addElement(fname);
	}

	
	//发送邮件
	public boolean sendMail() {

		// 构造mail session
		Properties props = System.getProperties();
		props.put("mail.smtp.host", host);
		props.put("mail.smtp.auth", "true");
		Session session = Session.getDefaultInstance(props, new Authenticator() {
			public PasswordAuthentication getPasswordAuthentication() {
				return new PasswordAuthentication(username, password);
			}
		});

		try {
			// 构造MimeMessage 并设定基本的值
			MimeMessage msg = new MimeMessage(session);
			msg.setFrom(new InternetAddress(from));
			InternetAddress[] address = { new InternetAddress(to) };
			msg.setRecipients(Message.RecipientType.TO, address);
			subject = transferChinese(subject);
			msg.setSubject(subject);

			// 构造Multipart
			Multipart mp = new MimeMultipart();

			// 向Multipart添加正文
			MimeBodyPart mbpContent = new MimeBodyPart();
			mbpContent.setText(content);
			// 向MimeMessage添加（Multipart代表正文）
			mp.addBodyPart(mbpContent);

			// 向Multipart添加附件
			Enumeration efile = file.elements();
			while (efile.hasMoreElements()) {

				MimeBodyPart mbpFile = new MimeBodyPart();
				filename = efile.nextElement().toString();
				FileDataSource fds = new FileDataSource(filename);
				mbpFile.setDataHandler(new DataHandler(fds));
				mbpFile.setFileName(fds.getName());
				// 向MimeMessage添加（Multipart代表附件）
				mp.addBodyPart(mbpFile);

			}

			file.removeAllElements();
			// 向Multipart添加MimeMessage
			msg.setContent(mp);
			msg.setSentDate(new Date());
			// 发送邮件
			Transport.send(msg);

		} catch (MessagingException mex) {
			mex.printStackTrace();
			Exception ex = null;
			if ((ex = mex.getNextException()) != null) {
				ex.printStackTrace();
			}
			return false;
		}
		return true;
	}

}

三、实例化，配置邮箱并发送邮件

//测试发送邮件

public class testMail {
	public static void main(String[] args){
		  Mail sendmail = new Mail();
		  sendmail.setHost("smtp.qq.com");           //服务器地址
		  sendmail.setUserName("xxxxxxxxxx@qq.com"); //登录服务器校验用户
		  sendmail.setPassWord("xxxxxxxxxxxxxxxxx");  //登录服务器校验密码
		                                    
		  
		  
		  sendmail.setTo("xxxxxxxxxxx@qq.com");       //收件人
		  sendmail.setFrom("xxxxxxxxx@qq.com");     //发件人          
		  sendmail.setSubject("新的账单");           //主题(标题)
		  sendmail.setContent("这是六月份的账单");   //内容
		  //Mail sendmail = new 
Mail("aaaaaaaaa@163.com","aaaaaaaaa@163.com","smtp.163.com","aaaaaaaaa","aaaaaaaaa","你好","喂，你好吗？");//也可以一条语句设置
		 
		  
		  //添加附件     
		  sendmail.attachfile("D:\\1.png");
		  //sendmail.attachfile("D:\\hhh.xls");  // 可以有多个附件，调用一次就就添加一个附件文件 
		  
		  
		  
		  //发送邮件
		  boolean flag=sendmail.sendMail();
		  if(flag==true) {
			  System.out.println("发送成功！");
		  }else {
			  System.out.println("发送失败！");
		  }

	}

}

以QQ邮箱为例，服务器地址为smtp.qq.com ，不同的邮箱会有差异  

这里的PassWord不是邮箱的密码，这个要登录邮箱去获取，我把它理解成 授权码/验证码，

有了这个程序就能用你的账号发送邮件，获取方法我放在下面