Java实现发邮件功能
代码如下:
package com.weimob.finance.utils;
import java.io.UnsupportedEncodingException;
import java.util.Date;
import java.util.List;
import java.util.Properties;
import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
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;
/**
* Java Mail 工具类
*
* @author XueQi
* @version 1.0
*
*/
public class MailUtils {
private static String host;
private static String username;
private static String password;
private static String from;
private static String nick;
static {
try {
// Test Data
host = "smtp.qq.com";
username = "yourqq@qq.com";
password = "*******";
from = "yourqq@qq.com";
nick = "nickinfo";
// nick + from 组成邮箱的发件人信息
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 发送邮件
*
* @param to
* 收件人列表，以","分割
* @param subject
* 标题
* @param body
* 内容
* @param filepath
* 附件列表,无附件传递null
* @return
* @throws MessagingException
* @throws AddressException
* @throws UnsupportedEncodingException
*/
public static boolean sendMail(String to, String subject, String body,
List<String> filepath) throws AddressException, MessagingException,
UnsupportedEncodingException {
// 参数修饰
if (body == null) {
body = "";
}
if (subject == null) {
subject = "无主题";
}
// 创建Properties对象
Properties props = System.getProperties();
// 创建信件服务器
props.put("mail.smtp.host", host);
props.put("mail.smtp.auth", "true"); // 通过验证
props.put("mail.smtp.port", "465");
props.put("mail.transport.protocol", "smtp");
props.put("mail.smtp.ssl.enable", "true");
//props.put("mail.debug", "true");
// 得到默认的对话对象
Session session = Session.getDefaultInstance(props, null);
// 创建一个消息，并初始化该消息的各项元素
MimeMessage msg = new MimeMessage(session);
nick = MimeUtility.encodeText(nick);
msg.setFrom(new InternetAddress(nick + "<" + from + ">"));
// 创建收件人列表
if (to != null && to.trim().length() > 0) {
String[] arr = to.split(",");
int receiverCount = arr.length;
if (receiverCount > 0) {
InternetAddress[] address = new InternetAddress[receiverCount];
for (int i = 0; i < receiverCount; i++) {
address[i] = new InternetAddress(arr[i]);
}
msg.addRecipients(Message.RecipientType.TO, address);
msg.setSubject(subject);
// 后面的BodyPart将加入到此处创建的Multipart中
Multipart mp = new MimeMultipart();
// 附件操作
if (filepath != null && filepath.size() > 0) {
for (String filename : filepath) {
MimeBodyPart mbp = new MimeBodyPart();
// 得到数据源
FileDataSource fds = new FileDataSource(filename);
// 得到附件本身并至入BodyPart
mbp.setDataHandler(new DataHandler(fds));
// 得到文件名同样至入BodyPart
mbp.setFileName(fds.getName());
mp.addBodyPart(mbp);
}
MimeBodyPart mbp = new MimeBodyPart();
mbp.setText(body);
mp.addBodyPart(mbp);
// 移走集合中的所有元素
filepath.clear();
// Multipart加入到信件
msg.setContent(mp);
} else {
// 设置邮件正文
msg.setText(body);
}
// 设置信件头的发送日期
msg.setSentDate(new Date());
msg.saveChanges();
// 发送信件
Transport transport = session.getTransport("smtp");
transport.connect(username, password);
transport.sendMessage(msg,
msg.getRecipients(Message.RecipientType.TO));
transport.close();
return true;
} else {
System.out.println("None receiver!");
return false;
}
} else {
System.out.println("None receiver!");
return false;
}
}
public static void main(String[] args) throws AddressException,
UnsupportedEncodingException, MessagingException {
sendMail("toother@qq.com,yourqq@qq.com", "注册信息邮件", "注册邮件，有附件", null);
System.out.println("sendMail success!");
}
}
准备过程:
1.QQ邮箱两个
2.发送邮件的jar包
mail.jar
<dependency>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
<version>1.5.0-b01</version>
</dependency>
3.用QQ给QQ发送邮件，发送方得开启第三方登录，也就是授权登录，下面就是获取授权码解释链接
需要开始POP3和SMTP，还有点击生成授权码
4.java代码(上面已附)
5运行,最后显示 250 Mail OK即发送成功
中间可能遇到的问题:
1.邮箱，帐号，密码配置不正确导致报connection failed error!
2.邮箱没有开启smpt协议。如上面步骤3操作
3.报 java.io.FileNotFoundException:
原因是,eclipse 自带的mail jar包与maven导入的mail jar包冲突，删除掉j2ee中mail jar ，冲突即可解决！
