借助javaMail来发送邮件之代码篇

1 端口说明:

邮件经过安全加密处理后，端口号会发生相应的变化。

POP3服务器端口：995

支持SSL

SMTP服务器端口： 端口：465 或者 587

支持SSL（TSL）

465端口是SSL/TLS通讯协议的 内容一开始就被保护起来了 是看不到原文的。

587端口是STARTTLS协议的 属于TLS通讯协议 只是他是在STARTTLS命令执行后才对之后的原文进行保护的。

2 发送邮件准备

1) 确认执行邮件发送程序的机器能够联通。 邮件发送服务器服务 如 我现在想连接 smtp.myCom.com。可以ping一下。

2) 生成一个SSL邮件认证文件。 sun网站上有相应的InstallCert.java文件。网上也有很多下载的地方。

InstallCert.java 的类文件全部内容为:

****************************************************

/*

* Copyright 2006 Sun Microsystems, Inc. All Rights Reserved.

*

* Redistribution and use in source and binary forms, with or without

* modification, are permitted provided that the following conditions

* are met:

*

* - Redistributions of source code must retain the above copyright

* notice, this list of conditions and the following disclaimer.

*

* - Redistributions in binary form must reproduce the above copyright

* notice, this list of conditions and the following disclaimer in the

* documentation and/or other materials provided with the distribution.

*

* - Neither the name of Sun Microsystems nor the names of its

* contributors may be used to endorse or promote products derived

* from this software without specific prior written permission.

*

* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR

* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

import java.io.*;

import java.net.URL;

import java.security.*;

import java.security.cert.*;

import javax.net.ssl.*;

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);

}

}

}

******************************************************

运行 javac InstallCert.java 生成 InstallCert.class文件。

运行 java InstallCert smtp.myCom.com:587。

得到jssecacerts文件后复制到一个文件夹目录下，如我放的路径为 D:\MailServer文件夹路径下。

3 发送邮件的主要代码如下：

主要的引用类为

import java.io.IOException;

import java.io.InputStream;

import java.io.UnsupportedEncodingException;

import java.security.Security;

import java.util.Date;

import java.util.Properties;

import java.util.logging.Level;

import javax.mail.Authenticator;

import javax.mail.Message;

import javax.mail.MessagingException;

import javax.mail.PasswordAuthentication;

import javax.mail.Session;

import javax.mail.Transport;

import javax.mail.internet.AddressException;

import javax.mail.internet.InternetAddress;

import javax.mail.internet.MimeMessage;

protected void sentMail() throws SQLException {

// 邮箱的用户名

String username = "weiguolee";

//邮件的密码

String password = "weiguolee123";

//安全认证文件地址 网上有现成的安全认证文件的原类，以及生成安全认证文件的具体方法。是一个jssecacerts文件

String address = "D:\MailServer\jssecacerts";

Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());

final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";

// Get a Properties object

System.setProperty("javax.net.ssl.trustStore", address);

Properties props = System.getProperties();

//smtp.myCom.com 为 公司邮件服务器的发送邮件服务

props.setProperty("mail.smtp.host", "smtp.myCom.com");

props.setProperty("mail.smtp.starttls.enable", "true");

props.setProperty("mail.smtp.socketFactory.fallback", "false");

props.setProperty("mail.smtp.port", "587");

props.setProperty("mail.smtp.socketFactory.port", "587");

props.put("mail.smtp.auth", "true");

Session session = Session.getDefaultInstance(props,

new Authenticator() {

protected PasswordAuthentication getPasswordAuthentication() {

return new PasswordAuthentication(username, password);

}

});

Message msg = new MimeMessage(session);

try {

// "公司邮件通知系统" 为 发送邮件时候，在别人邮箱中显示的发件人名称。

msg.setFrom(new InternetAddress(username + "@myCom.com","公司邮件通知系统"));

//发送人为 weiguo@myCom.com

String sendMail="weiguo@myCom.com";

msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(sendMail,false));

msg.setSubject("这是发送邮件的标题");

msg.setText("这是发送邮件的主要内容");

//邮件的发送日期

msg.setSentDate(new Date());

// 调用javaMail中的发送对象和方法进行邮件发送。

Transport.send(msg);

} catch (AddressException e) {

e.printStackTrace();

} catch (MessagingException e) {

e.printStackTrace();

}catch (UnsupportedEncodingException e) {

e.printStackTrace();

}

}