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：
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 recipients = new ArrayList(); // 收件人地址集合
private String subject; // 邮件主题
private String content; // 邮件正文
private List p_w_uploadNames = new ArrayList(); // 附件路径信息集合
public SendMailBySSL() {
}
public SendMailBySSL(String smtpServer, String port, String username,
String password, List recipients, String subject,
String content, List p_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;
}
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 recipients) {
this.recipients = recipients;
}
public void setSubject(String subject) {
this.subject = subject;
}
public void setContent(String content) {
this.content = content;
}
public void setAttachmentNames(List p_w_uploadNames) {
this.p_w_uploadNames = p_w_uploadNames;
}
/**
* 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 : p_w_uploadNames) {
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();
p_w_uploadNames.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 recipients = new ArrayList();
//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 p_w_uploadNames = new ArrayList();
p_w_uploadNames.add(“C://Users//Administrator//Desktop//kali.txt”);
SendMailBySSL sendMailBySSL = new SendMailBySSL(“smtp.163.com”, “465”,
“youname@163.com”, “youpassword”, recipients, subject, content,
p_w_uploadNames);
sendMailBySSL.sendMail();
}
}
三 测试结果如下
附：其他的几篇相关文章：