本文共 5971 字，大约阅读时间需要 19 分钟。
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：
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 | 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(); } } |
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