一 概念简介
Secure Socket Layer，为Netscape所研发，用以保障在Internet上数据传输之安全，利用数据加密(Encryption)技术，可确保数据在网络上之传输过程中不会被截取及窃听。一般通用之规格为40 bit之安全标准，美国则已推出128 bit之更高安全标准，但限制出境。只要3.0版本以上之I.E.或Netscape浏览器即可支持SSL。
当前版本为3.0。它已被广泛地用于Web浏览器与服务器之间的身份认证和加密数据传输。
（PS:来至百度百科）
二 在JavaMail中使用SSL对邮件发送进行加密
实际上大部分操作都跟普通的邮件发送是一样的，只是有两个地方有所变化。（1）传输端口从25改成465；（2）替换默认的socketFactory
下面我以163邮箱实现的SSL传输举例说明，下图是163邮箱官方给出的相关配置信息：
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package
javamail.zifangsky.com;
import
java.io.UnsupportedEncodingException;
import
java.util.ArrayList;
import
java.util.Date;
import
java.util.List;
import
java.util.Properties;
import
javax.activation.DataHandler;
import
javax.activation.FileDataSource;
import
javax.mail.Address;
import
javax.mail.BodyPart;
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;
import
javax.mail.internet.MimeUtility;
public
class
SendMailBySSL {
private
final
String SSL_FACTORY =
"javax.net.ssl.SSLSocketFactory"
;
private
String smtpServer;
// SMTP服务器地址
private
String port;
// 端口
private
String username;
// 登录SMTP服务器的用户名
private
String password;
// 登录SMTP服务器的密码
private
List<String> recipients =
new
ArrayList<String>();
// 收件人地址集合
private
String subject;
// 邮件主题
private
String content;
// 邮件正文
private
List<String> attachmentNames =
new
ArrayList<String>();
// 附件路径信息集合
public
SendMailBySSL() {
}
public
SendMailBySSL(String smtpServer, String port, String username,
String password, List<String> recipients, String subject,
String content, List<String> attachmentNames) {
this
.smtpServer = smtpServer;
this
.port = port;
this
.username = username;
this
.password = password;
this
.recipients = recipients;
this
.subject = subject;
this
.content = content;
this
.attachmentNames = attachmentNames;
}
public
void
setSmtpServer(String smtpServer) {
this
.smtpServer = smtpServer;
}
public
void
setPort(String port) {
this
.port = port;
}
public
void
setUsername(String username) {
this
.username = username;
}
public
void
setPassword(String password) {
this
.password = password;
}
public
void
setRecipients(List<String> recipients) {
this
.recipients = recipients;
}
public
void
setSubject(String subject) {
this
.subject = subject;
}
public
void
setContent(String content) {
this
.content = content;
}
public
void
setAttachmentNames(List<String> attachmentNames) {
this
.attachmentNames = attachmentNames;
}
/**
* 进行base64加密，防止中文乱码
* */
public
String changeEncode(String str) {
try
{
str = MimeUtility.encodeText(
new
String(str.getBytes(),
"UTF-8"
),
"UTF-8"
,
"B"
);
// "B"代表Base64
}
catch
(UnsupportedEncodingException e) {
e.printStackTrace();
}
return
str;
}
/**
* 正式发邮件
* */
public
boolean
sendMail() {
Properties properties =
new
Properties();
properties.put(
"mail.smtp.host"
, smtpServer);
properties.put(
"mail.smtp.auth"
,
"true"
);
properties.put(
"mail.smtp.socketFactory.class"
, SSL_FACTORY);
//使用JSSE的SSL socketfactory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);
Session session = Session.getInstance(properties);
session.setDebug(
true
);
MimeMessage message =
new
MimeMessage(session);
try
{
// 发件人
Address address =
new
InternetAddress(username);
message.setFrom(address);
// 收件人
for
(String recipient : recipients) {
System.out.println(
"收件人："
+ recipient);
Address toAddress =
new
InternetAddress(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(
new
Date());
Multipart multipart =
new
MimeMultipart();
// 添加文本
BodyPart text =
new
MimeBodyPart();
text.setText(content);
multipart.addBodyPart(text);
// 添加附件
for
(String fileName : attachmentNames) {
BodyPart adjunct =
new
MimeBodyPart();
FileDataSource fileDataSource =
new
FileDataSource(fileName);
adjunct.setDataHandler(
new
DataHandler(fileDataSource));
adjunct.setFileName(changeEncode(fileDataSource.getName()));
multipart.addBodyPart(adjunct);
}
// 清空收件人集合，附件集合
recipients.clear();
attachmentNames.clear();
message.setContent(multipart);
message.saveChanges();
}
catch
(Exception e) {
e.printStackTrace();
return
false
;
}
try
{
Transport transport = session.getTransport(
"smtp"
);
transport.connect(smtpServer, username, password);
transport.sendMessage(message, message.getAllRecipients());
transport.close();
}
catch
(Exception e) {
e.printStackTrace();
return
false
;
}
return
true
;
}
public
static
void
main(String[] args) {
List<String> recipients =
new
ArrayList<String>();
// recipients.add("123456789@qq.com");
recipients.add(
"admin@zifangsky.cn"
);
String subject =
"这封邮件是为了测试SMTP的SSL加密传输"
;
String content =
"这是这封邮件的正文"
;
List<String> attachmentNames =
new
ArrayList<String>();
attachmentNames.add(
"C://Users//Administrator//Desktop//kali.txt"
);
SendMailBySSL sendMailBySSL =
new
SendMailBySSL(
"smtp.163.com"
,
"465"
,
"youname@163.com"
,
"youpassword"
, recipients, subject, content,
attachmentNames);
sendMailBySSL.sendMail();
}
}
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三 测试结果如下
本文转自 pangfc 51CTO博客，原文链接：http://blog.51cto.com/983836259/1721164，如需转载请自行联系原作者
