需求：
邮件发送 使用jdk源生API——java.mail实现发邮件功能
(当然也有第三方工具，封装源码也十分抢眼，不做太多分享，可在csdn上自行查找)
以下代码即可发送邮件，以qq邮箱为例
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package com.example.demo.emailInfo;import javax.mail.Message;import javax.mail.MessagingException;import javax.mail.Session;import javax.mail.Transport;import javax.mail.internet.InternetAddress;import javax.mail.internet.MimeMessage;import java.io.UnsupportedEncodingException;import java.util.*;public class SendEmailInfo { public static void main(String[] args) throws MessagingException, UnsupportedEncodingException { String smtpServer = "smtp.qq.com"; String username = "939089358@qq.com"; //这里是你开通smtp协议的授权码，若是公司自定义服务器，可无需授权码，但需要配置证书，文章后面有详解 String password = "***********"; String receiver = "939089358@qq.com"; String receiver2 = "低调AI实验室@126.com"; //这里的配置可以自己抽取成工具 Properties properties = new Properties(); Map<String, Object> map = new HashMap<>(); //常用smtp使用配置，可以在其他文章中获取：这里针对使用qq发送邮件 map.put("mail.transport.protocol","smtp"); map.put("mail.smtp.host",smtpServer); map.put("mail.smtp.auth","true"); map.put("mail.smtp.port","465"); map.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory"); map.put("mail.smtp.socketFactory.fallback",false); map.put("mail.smtp.socketFactory.port","465"); map.put("mail.smtp.starttls.enable","true"); properties.putAll(map); //创建会话对象，用户邮件和服务器的交互 Session session = Session.getDefaultInstance(properties);// session.setDebug(true); //查看发送邮件的log //创建一邮件 MimeMessage message = new MimeMessage(session); InternetAddress senderAddress = new InternetAddress(username,"设置自定义发件人名称","UTF-8"); message.setFrom(senderAddress); message.setRecipient(Message.RecipientType.TO,new InternetAddress(receiver,"收件人自定义名称","UTF-8")); message.setSubject("设置发送的主题：比如：邀请函","UTF-8"); message.setContent("内容：邀请你和我一起约会，在屋顶吹晚风，看星星，吃水果","text/html;charset=UTF-8"); message.setSentDate(new Date()); message.saveChanges(); //用session 获取传输对象,然后连接发件人 Transport transport = session.getTransport(); transport.connect(username,password); transport.sendMessage(message,message.getAllRecipients()); transport.close(); System.out.println("发送成功"); }} |
若要使用企业内部自搭服务器，则需要在jdk文件中配置一个授权证书，操作如下：
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/* * 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); } } } |
证书生成步骤：
1、完整复制以上Java代码，放到桌面上新建了一个跟类名相同的.java文件，并放入新建文件夹中
2、cmd打开命令窗口，编译：javac InstallCert.java文件
3、运行：java InstallCert Java请求出错的站点URL
即自行搭建的服务器域名：例如：smtp.AIRow.com
4、然后输入1退出。
5、检查桌面，会生成一个jssecacerts的文件，把该文件设置到你的JDK下的/jre/lib/security目录下即可
6、若要上线功能，需要运维添加并导入证书。
7、若不使用企业或个人自搭服务器发送邮件，则无需配置证书。
总结
到此这篇关于使用Java自带的mail API实现邮件发送功能的文章就介绍到这了,更多相关Java mail API实现邮件发送内容请搜索服务器之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持服务器之家！
原文链接：https://blog.csdn.net/like_start/article/details/129935101
