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java 发送邮件

程序员文章站 2022-07-13 16:09:52
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之前没弄过java程序发送邮件的功能,因为公司要求所以弄了下,不过还是遇到很多问题,比如下面这个异常,应该是说域名错误,如果遇到这种问题的话,可将smtp改成mail就解决了我的问题!!

javax.mail.SendFailedException: Sending failed;
  nested exception is:
	class javax.mail.MessagingException: Unknown SMTP host: smtp.dgnetcop.com;

 下面把java发送邮件的代码贴出来

/**
 * 
 */
package javaMail;

import java.util.Date;
import java.util.Enumeration;
import java.util.Properties;
import java.util.Vector;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.PasswordAuthentication;
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;
import javax.mail.internet.MimeUtility;

/**
 * @author zj
 * 
 */
public class SendMail {

	String to = "";// 收件人
	String from = "";// 发件人
	String host = "";// smtp主机
	String username = "";
	String password = "";
	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

	/**
	 * <br>
	 * 方法说明:默认构造器 <br>
	 * 输入参数: <br>
	 * 返回类型:
	 */
	public SendMail() {
	}

	/**
	 * <br>
	 * 方法说明:构造器,提供直接的参数传入 <br>
	 * 输入参数: <br>
	 * 返回类型:
	 */
	public SendMail(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;
	}

	/**
	 * <br>
	 * 方法说明:设置邮件服务器地址 <br>
	 * 输入参数:String host 邮件服务器地址名称 <br>
	 * 返回类型:
	 */
	public void setHost(String host) {
		this.host = host;
	}

	/**
	 * <br>
	 * 方法说明:设置登录服务器校验密码 <br>
	 * 输入参数: <br>
	 * 返回类型:
	 */
	public void setPassWord(String pwd) {
		this.password = pwd;
	}

	/**
	 * <br>
	 * 方法说明:设置登录服务器校验用户 <br>
	 * 输入参数: <br>
	 * 返回类型:
	 */
	public void setUserName(String usn) {
		this.username = usn;
	}

	/**
	 * <br>
	 * 方法说明:设置邮件发送目的邮箱 <br>
	 * 输入参数: <br>
	 * 返回类型:
	 */
	public void setTo(String to) {
		this.to = to;
	}

	/**
	 * <br>
	 * 方法说明:设置邮件发送源邮箱 <br>
	 * 输入参数: <br>
	 * 返回类型:
	 */
	public void setFrom(String from) {
		this.from = from;
	}

	/**
	 * <br>
	 * 方法说明:设置邮件主题 <br>
	 * 输入参数: <br>
	 * 返回类型:
	 */
	public void setSubject(String subject) {
		this.subject = subject;
	}

	/**
	 * <br>
	 * 方法说明:设置邮件内容 <br>
	 * 输入参数: <br>
	 * 返回类型:
	 */
	public void setContent(String content) {
		this.content = content;
	}

	/**
	 * <br>
	 * 方法说明:把主题转换为中文 <br>
	 * 输入参数:String strText <br>
	 * 返回类型:
	 */
	public String transferChinese(String strText) {
		try {
			strText = MimeUtility.encodeText(new String(strText.getBytes(),
					"GB2312"), "GB2312", "B");
		} catch (Exception e) {
			e.printStackTrace();
		}
		return strText;
	}

	/**
	 * <br>
	 * 方法说明:往附件组合中添加附件 <br>
	 * 输入参数: <br>
	 * 返回类型:
	 */
	public void attachfile(String fname) {
		file.addElement(fname);
	}

	/**
	 * <br>
	 * 方法说明:发送邮件 <br>
	 * 输入参数: <br>
	 * 返回类型:boolean 成功为true,反之为false
	 */
	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;
	}

	/**
	 * <br>
	 * 方法说明:主方法,用于测试 <br>
	 * 输入参数: <br>
	 * 返回类型:
	 */
	public static void main(String[] args) {
		SendMail sendmail = new SendMail();
		sendmail.setHost("smtp.dgnetcop.com");//发送邮件的域名,这里如果报上面的错误,可将smtp改成mail
		sendmail.setUserName("uuu");//你的用户名
		sendmail.setPassWord("ppp");//你的密码
		sendmail.setTo("xxx.com"); //发送给哪个地址
		sendmail.setFrom("yyy.com");//你的邮箱
		sendmail.setSubject("你好,这是一个测试");
		sendmail.setContent("你好,这是一个测试!");
		//sendmail.attachfile("d:\\test.html");//附件物理地址
		sendmail.sendMail();
		System.out.println("成功!");
	}
}