使用SSL加密邮件的示例：

例如在JavaMail中使用SSL对邮件发送进行加密，源码如下：

packagejavamail.yisu.com;
importjava.io.UnsupportedEncodingException;
importjava.util.ArrayList;
importjava.util.Date;
importjava.util.List;
importjava.util.Properties;
importjavax.activation.DataHandler;
importjavax.activation.FileDataSource;
importjavax.mail.Address;
importjavax.mail.BodyPart;
importjavax.mail.Multipart;
importjavax.mail.Session;
importjavax.mail.Transport;
importjavax.mail.internet.InternetAddress;
importjavax.mail.internet.MimeBodyPart;
importjavax.mail.internet.MimeMessage;
importjavax.mail.internet.MimeMultipart;
importjavax.mail.internet.MimeUtility;
publicclassSendMailBySSL{
privatefinalStringSSL_FACTORY="javax.net.ssl.SSLSocketFactory";
privateStringsmtpServer;//SMTP服务器地址
privateStringport;//端口
privateStringusername;//登录SMTP服务器的用户名
privateStringpassword;//登录SMTP服务器的密码
privateListrecipients=newArrayList();//收件人地址集合
privateStringsubject;//邮件主题
privateStringcontent;//邮件正文
privateListp_w_uploadNames=newArrayList();//附件路径信息集合
publicSendMailBySSL(){
}
publicSendMailBySSL(StringsmtpServer,Stringport,Stringusername,
Stringpassword,Listrecipients,Stringsubject,
Stringcontent,Listp_w_uploadNames){
this.smtpServer=smtpServer;
this.port=port;
this.username=username;
this.password=password;
this.recipients=recipients;
this.subject=subject;
this.content=content;
this.p_w_uploadNames=p_w_uploadNames;
}
publicvoidsetSmtpServer(StringsmtpServer){
this.smtpServer=smtpServer;
}
publicvoidsetPort(Stringport){
this.port=port;
}
publicvoidsetUsername(Stringusername){
this.username=username;
}
publicvoidsetPassword(Stringpassword){
this.password=password;
}
publicvoidsetRecipients(Listrecipients){
this.recipients=recipients;
}
publicvoidsetSubject(Stringsubject){
this.subject=subject;
}
publicvoidsetContent(Stringcontent){
this.content=content;
}
publicvoidsetAttachmentNames(Listp_w_uploadNames){
this.p_w_uploadNames=p_w_uploadNames;
}
/**
*进行base64加密，防止中文乱码
**/
publicStringchangeEncode(Stringstr){
try{
str=MimeUtility.encodeText(newString(str.getBytes(),"UTF-8"),
"UTF-8","B");//"B"代表Base64
}catch(UnsupportedEncodingExceptione){
e.printStackTrace();
}
returnstr;
}
/**
*正式发邮件
**/
publicbooleansendMail(){
Propertiesproperties=newProperties();
properties.put("mail.smtp.host",smtpServer);
properties.put("mail.smtp.auth","true");
properties.put("mail.smtp.socketFactory.class",SSL_FACTORY);//使用JSSE的SSLsocketfactory来取代默认的socketfactory
properties.put("mail.smtp.socketFactory.fallback","false");//只处理SSL的连接,对于非SSL的连接不做处理
properties.put("mail.smtp.port",port);
properties.put("mail.smtp.socketFactory.port",port);
Sessionsession=Session.getInstance(properties);
session.setDebug(true);
MimeMessagemessage=newMimeMessage(session);
try{
//发件人
Addressaddress=newInternetAddress(username);
message.setFrom(address);
//收件人
for(Stringrecipient:recipients){
System.out.println("收件人："+recipient);
AddresstoAddress=newInternetAddress(recipient);
message.setRecipient(MimeMessage.RecipientType.TO,toAddress);//设置收件人,并设置其接收类型为TO
/**
*TO：代表有健的主要接收者。CC：代表有健的抄送接收者。BCC：代表邮件的暗送接收者。
**/
}
//主题
message.setSubject(changeEncode(subject));
//时间
message.setSentDate(newDate());
Multipartmultipart=newMimeMultipart();
//添加文本
BodyParttext=newMimeBodyPart();
text.setText(content);
multipart.addBodyPart(text);
//添加附件
for(StringfileName:p_w_uploadNames){
BodyPartadjunct=newMimeBodyPart();
FileDataSourcefileDataSource=newFileDataSource(fileName);
adjunct.setDataHandler(newDataHandler(fileDataSource));
adjunct.setFileName(changeEncode(fileDataSource.getName()));
multipart.addBodyPart(adjunct);
}
//清空收件人集合，附件集合
recipients.clear();
p_w_uploadNames.clear();
message.setContent(multipart);
message.saveChanges();
}catch(Exceptione){
e.printStackTrace();
returnfalse;
}
try{
Transporttransport=session.getTransport("smtp");
transport.connect(smtpServer,username,password);
transport.sendMessage(message,message.getAllRecipients());
transport.close();
}catch(Exceptione){
e.printStackTrace();
returnfalse;
}
returntrue;
}
publicstaticvoidmain(String[]args){
Listrecipients=newArrayList();
//recipients.add("123456789@qq.com");
recipients.add("admin@yisu.cn");
Stringsubject="这封邮件是为了测试SMTP的SSL加密传输";
Stringcontent="这是这封邮件的正文";
Listp_w_uploadNames=newArrayList();
p_w_uploadNames.add("C://Users//Administrator//Desktop//kali.txt");
SendMailBySSLsendMailBySSL=newSendMailBySSL("smtp.163.com","465",
"youname@163.com","youpassword",recipients,subject,content,
p_w_uploadNames);
sendMailBySSL.sendMail();
}
}