Java 实现发送邮件功能

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.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;

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
private String username = ""; // smtp认证用户名和密码
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

public Mail(String smtp) {
setSmtpHost(smtp);
createMimeMessage();
}

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
}

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(); // mp 一个multipart对象
// Multipart is a container that holds multiple body parts.
return true;
} catch (Exception e) {
System.err.println("创建MIME邮件对象失败！" + e);
return false;
}
}

public void setNeedAuth(boolean need) {
needAuth = need;
System.out.println("设置smtp身份认证：mail.smtp.auth = " + need);
if (props == null)
props = System.getProperties();
if (needAuth) {
props.put("mail.smtp.auth", "true");
} else {
props.put("mail.smtp.auth", "false");
}
}

public void setNamePass(String name, String pass) {
System.out.println("程序得到用户名与密码");
username = name;
password = pass;
}

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;
}
}

public boolean setBody(String mailBody) {
try {
System.out.println("设置邮件体格式");
BodyPart bp = new MimeBodyPart();
bp.setContent(
"<meta http-equiv=Content-Type content=text/html; charset=gb2312>"
+ mailBody, "text/html;charset=GB2312");
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;
}
}

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;
}
}

public boolean setFile(Object o, String type) {
try {
mimeMsg.setContent(o, type);
} catch (MessagingException e) {
e.printStackTrace();
return false;
}
return true;
}

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;
}
}

public boolean setTo(String to) {
System.out.println("设置收信人");
if (to == null)
return false;
try {
mimeMsg.setRecipients(Message.RecipientType.TO,
InternetAddress.parse(to));
return true;
} catch (Exception e) {
return false;
}
}

public boolean setCopyTo(String copyto) {
System.out.println("发送附件到");
if (copyto == null)
return false;
try {
mimeMsg.setRecipients(Message.RecipientType.CC,
(Address[]) InternetAddress.parse(copyto));
return true;
} catch (Exception e) {
return false;
}
}

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.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;
}
}
}

public static int sendEmail(String subject, String mailBody,
String attachmentDir, String smtpString, boolean needAuth,
String to, String from, String password, Object file, String type) {

int result = 0;
Mail mMail = new Mail(smtpString);
mMail.setNeedAuth(needAuth);
mMail.setNamePass(from, password);
if (subject == null) {
subject = "Test Result";
}
if (!mMail.setSubject(subject)) {
return -1;
}
if (!mMail.setBody(mailBody)) {
return -2;
}
if (!mMail.setTo(to)) {
return -3;
}
if (!mMail.setFrom(from)) {
return -4;
}
if (attachmentDir != null) {
if (!mMail.addFileAffix(attachmentDir)) {
return -5;
}
}

if (file != null && type != null) {
if (!mMail.setFile(file, type)) {
return -7;
}
}

if (!mMail.sendout()) {
return -6;
}
return result;
}