javamail

来源：互联网发布：电吉他效果器软件app 编辑：程序博客网时间：2024/06/06 19:20

JavaMail

Java 官方提供了对电子邮件协议封装的 Java 类库，就是JavaMail，但并没有包含到标准的 JDK 中，需要我们自己去 Java 或 Oracle 官网下载。

下载地址:
https://java.net/projects/javamail/pages/Home
或者
http://www.oracle.com/technetwork/java/javamail/index.html

自建了一个发送类:

import java.util.Date;import java.util.Properties;import javax.mail.MessagingException;import javax.mail.NoSuchProviderException;import javax.mail.Session;import javax.mail.Transport;import javax.mail.internet.InternetAddress;import javax.mail.internet.MimeMessage;public class Mymail {    final String SMTP_QQ = "";    final String SMTP_163 = "smtp.163.com";        final int SMTP_PORT = 465;    final String sendHost = "smtp.xx.com";    final String sendMail = "xxx@xxx.com";    final String sendPwd = "xxxx";        public void sendVerficaionUrlBySelf(String receiveMail, String url)throws Exception{                String subject = "邮箱验证 Email verification";        String content ="点击以下链接激活：(如果无法直接打开，可将它复制到浏览器地址栏访问)" +                    "<br/>" +                    "Click the following link to activate: (if not directly open, please copy it to your browser's address bar to access)" +                    "<br/>" +                    "<a href='"+url+"'>"+url+"</a>";                baseSend(sendHost, sendMail, sendPwd, receiveMail, subject, content);    }        public void sendVerficaionUrlBySelfSSL(String receiveMail, String url)throws Exception{                String subject = "邮箱验证 Email verification";        String content ="点击以下链接激活：(如果无法直接打开，可将它复制到浏览器地址栏访问)" +                    "<br/>" +                    "Click the following link to activate: (if not directly open, please copy it to your browser's address bar to access)" +                    "<br/>" +                    "<a href='"+url+"'>"+url+"</a>";                sslSend(sendHost, sendMail, sendPwd, receiveMail, subject, content);    }                private Properties baseProperties(String myEmailSMTPHost){     // 用于连接邮件服务器的参数配置        Properties props = new Properties();                    // 参数配置        props.setProperty("mail.transport.protocol", "smtp");   // 使用的协议（JavaMail规范要求）        props.setProperty("mail.host", myEmailSMTPHost);        // 发件人的邮箱的 SMTP 服务器地址        props.setProperty("mail.smtp.auth", "true");            // 请求认证，参数名称与具体实现有关                        return props;    }        private Properties sslProperties(String myEmailSMTPHost){     // 用于连接邮件服务器的参数配置        Properties props = new Properties();                    // 参数配置        props.setProperty("mail.transport.protocol", "smtps");   // 使用的ssl协议（JavaMail规范要求）        props.setProperty("mail.smtps.host", myEmailSMTPHost);        // 发件人的邮箱的 SMTP 服务器地址        props.setProperty("mail.smtps.auth", "true");            // 请求认证，参数名称与具体实现有关                return props;    }        private MimeMessage createMiMsg(Session session, String sendMail, String receiveMail, String subject, String content) throws Exception {        MimeMessage miMsg = new MimeMessage(session);        // 发件人        miMsg.setFrom(new InternetAddress(sendMail, "SIRUI", "UTF-8"));        // To: 收件人（可以增加多个收件人、抄送、密送）        miMsg.setRecipient(MimeMessage.RecipientType.TO, new InternetAddress(receiveMail, "", "UTF-8"));        // 邮件主题        miMsg.setSubject(subject, "UTF-8");        // 邮件正文（可以使用html标签）        miMsg.setContent(content, "text/html;charset=UTF-8");        // 发件时间        miMsg.setSentDate(new Date());        // 保存设置        miMsg.saveChanges();        return miMsg;            }        private void baseSend(String smtphost, String sendMail, String sendPwd, String receiveMail, String subject,String content) throws Exception{             // 根据配置创建会话对象, 用于和邮件服务器交互        Session session = Session.getDefaultInstance(baseProperties(smtphost));     // 设置为debug模式, 可以查看详细的发送 log        session.setDebug(true);                        MimeMessage mimsg = createMiMsg(session, sendMail, receiveMail, subject, content);             // 获取邮件传输对象        Transport transport = session.getTransport();//        使用 邮箱账号 和 密码 连接邮件服务器        //    这里认证的邮箱必须与 message 中的发件人邮箱一致，否则报错//        transport.connect(sendMail, sendPwd);        //ssl        transport.connect(sendMail, sendPwd);     // 发送邮件, 发到所有的收件地址, getAllRecipients() 获取到的是在创建邮件对象时添加的所有收件人, 抄送人, 密送人//        transport.sendMessage(mimsg, mimsg.getAllRecipients());        transport.sendMessage(mimsg, mimsg.getRecipients(MimeMessage.RecipientType.TO));        // 关闭连接        transport.close();    }        private void sslSend(String smtphost, String sendMail, String sendPwd, String receiveMail, String subject,String content) throws Exception{                // 根据配置创建会话对象, 用于和邮件服务器交互           Session session = Session.getDefaultInstance(sslProperties(smtphost));        // 设置为debug模式, 可以查看详细的发送 log           session.setDebug(true);                                 MimeMessage mimsg = createMiMsg(session, sendMail, receiveMail, subject, content);                   // 获取邮件传输对象           Transport transport = session.getTransport();//           使用 邮箱账号 和 密码 连接邮件服务器           //    这里认证的邮箱必须与 message 中的发件人邮箱一致，否则报错//           transport.connect(sendMail, sendPwd);           //ssl           transport.connect(smtphost, SMTP_PORT,sendMail, sendPwd);        // 发送邮件, 发到所有的收件地址, getAllRecipients() 获取到的是在创建邮件对象时添加的所有收件人, 抄送人, 密送人//           transport.sendMessage(mimsg, mimsg.getAllRecipients());           transport.sendMessage(mimsg, mimsg.getRecipients(MimeMessage.RecipientType.TO));           // 关闭连接           transport.close();       }}

简介：类似与http与 https协议, 邮件系统也有 ssl, 而明文的smtp端口是25, 加密的是465.

当用465时候，出现此报错： unable to find valid certification path to requested target

仔细一看，是找不到证书，问题很大，证书好像很遥远。。于是找到一个获取证书的类

import java.io.BufferedReader;  import java.io.File;  import java.io.FileInputStream;  import java.io.FileOutputStream;  import java.io.InputStream;  import java.io.InputStreamReader;  import java.io.OutputStream;  import java.security.KeyStore;  import java.security.MessageDigest;  import java.security.cert.CertificateException;  import java.security.cert.X509Certificate;    import javax.net.ssl.SSLContext;  import javax.net.ssl.SSLException;  import javax.net.ssl.SSLSocket;  import javax.net.ssl.SSLSocketFactory;  import javax.net.ssl.TrustManager;  import javax.net.ssl.TrustManagerFactory;  import javax.net.ssl.X509TrustManager; public class InstallCert {    public static void main(String[] args) throws Exception {          String host;          int port;          char[] passphrase;          if ((args.length == 1) || (args.length == 2)) {              String[] c = args[0].split(":");              host = c[0];              port = (c.length == 1) ? 443 : Integer.parseInt(c[1]);              String p = (args.length == 1) ? "changeit" : args[1];              passphrase = p.toCharArray();          } else {              System.out                      .println("Usage: java InstallCert <host>[:port] [passphrase]");              return;          }            File file = new File("jssecacerts");          if (file.isFile() == false) {              char SEP = File.separatorChar;              File dir = new File(System.getProperty("java.home") + SEP + "lib"                      + SEP + "security");              file = new File(dir, "jssecacerts");              if (file.isFile() == false) {                  file = new File(dir, "cacerts");              }          }          System.out.println("Loading KeyStore " + file + "...");          InputStream in = new FileInputStream(file);          KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());          ks.load(in, passphrase);          in.close();            SSLContext context = SSLContext.getInstance("TLS");          TrustManagerFactory tmf = TrustManagerFactory                  .getInstance(TrustManagerFactory.getDefaultAlgorithm());          tmf.init(ks);          X509TrustManager defaultTrustManager = (X509TrustManager) tmf                  .getTrustManagers()[0];          SavingTrustManager tm = new SavingTrustManager(defaultTrustManager);          context.init(null, new TrustManager[] { tm }, null);          SSLSocketFactory factory = context.getSocketFactory();            System.out                  .println("Opening connection to " + host + ":" + port + "...");          SSLSocket socket = (SSLSocket) factory.createSocket(host, port);          socket.setSoTimeout(10000);          try {              System.out.println("Starting SSL handshake...");              socket.startHandshake();              socket.close();              System.out.println();              System.out.println("No errors, certificate is already trusted");          } catch (SSLException e) {              System.out.println();              e.printStackTrace(System.out);          }            X509Certificate[] chain = tm.chain;          if (chain == null) {              System.out.println("Could not obtain server certificate chain");              return;          }            BufferedReader reader = new BufferedReader(new InputStreamReader(                  System.in));            System.out.println();          System.out.println("Server sent " + chain.length + " certificate(s):");          System.out.println();          MessageDigest sha1 = MessageDigest.getInstance("SHA1");          MessageDigest md5 = MessageDigest.getInstance("MD5");          for (int i = 0; i < chain.length; i++) {              X509Certificate cert = chain[i];              System.out.println(" " + (i + 1) + " Subject "                      + cert.getSubjectDN());              System.out.println("   Issuer  " + cert.getIssuerDN());              sha1.update(cert.getEncoded());              System.out.println("   sha1    " + toHexString(sha1.digest()));              md5.update(cert.getEncoded());              System.out.println("   md5     " + toHexString(md5.digest()));              System.out.println();          }            System.out                  .println("Enter certificate to add to trusted keystore or 'q' to quit: [1]");          String line = reader.readLine().trim();          int k;          try {              k = (line.length() == 0) ? 0 : Integer.parseInt(line) - 1;          } catch (NumberFormatException e) {              System.out.println("KeyStore not changed");              return;          }            X509Certificate cert = chain[k];          String alias = host + "-" + (k + 1);          ks.setCertificateEntry(alias, cert);            OutputStream out = new FileOutputStream("jssecacerts");          ks.store(out, passphrase);          out.close();            System.out.println();          System.out.println(cert);          System.out.println();          System.out                  .println("Added certificate to keystore 'jssecacerts' using alias '"                          + alias + "'");      }        private static final char[] HEXDIGITS = "0123456789abcdef".toCharArray();        private static String toHexString(byte[] bytes) {          StringBuilder sb = new StringBuilder(bytes.length * 3);          for (int b : bytes) {              b &= 0xff;              sb.append(HEXDIGITS[b >> 4]);              sb.append(HEXDIGITS[b & 15]);              sb.append(' ');          }          return sb.toString();      }        private static class SavingTrustManager implements X509TrustManager {            private final X509TrustManager tm;          private X509Certificate[] chain;            SavingTrustManager(X509TrustManager tm) {              this.tm = tm;          }            public X509Certificate[] getAcceptedIssuers() {              throw new UnsupportedOperationException();          }            public void checkClientTrusted(X509Certificate[] chain, String authType)                  throws CertificateException {              throw new UnsupportedOperationException();          }            public void checkServerTrusted(X509Certificate[] chain, String authType)                  throws CertificateException {              this.chain = chain;              tm.checkServerTrusted(chain, authType);          }      } }

神器啊，把它保存到D盘

编译它： javac InstallCert , 会在D盘看到生成好的class

执行：java InstallCert smtp.xxx.com:465 changeit

changeit是密码, main函数里可以修改

根据运行提示信息，输入1，回车，在当前目录下生成名为： jssecacerts 的证书

将证书放置到$JAVA_HOME/jre/lib/security目录下，切记该JDK的jre是工程所用的环境！！！

0 0