依赖javax.mail.jar,地址：https://java.net/projects/javamail/pages/Home
完整示例代码如下：
1 package com.jadic.utils; 2 3 import java.io.UnsupportedEncodingException; 4 import java.util.ArrayList; 5 import java.util.Date; 6 import java.util.List; 7 import java.util.Properties; 8 import java.util.regex.Pattern; 9 10 import javax.mail.Authenticator; 11 import javax.mail.Message; 12 import javax.mail.MessagingException; 13 import javax.mail.PasswordAuthentication; 14 import javax.mail.Session; 15 import javax.mail.Transport; 16 import javax.mail.internet.AddressException; 17 import javax.mail.internet.InternetAddress; 18 import javax.mail.internet.MimeBodyPart; 19 import javax.mail.internet.MimeMessage; 20 import javax.mail.internet.MimeMultipart; 21 import javax.mail.internet.MimeUtility; 22 23 /** 24 * 简易邮件发送<br> 25 * 需提供邮件服务提供商的smtp地址、邮箱账号、密码收件人邮箱<br><br> 26 * 使用方式:<br> 27 * 1.实例化JMail对象，适合多次利用相同账号信息发送到相同收件人<br> 28 * JMail jMail = new JMail(...);<br> 29 * jMail.sendMail(subject, content);<br> 30 * 2.直接调用JMail静态方法发送，需每次都将smtp、账号、收件人、内容提供<br> 31 * JMail.sendMail(smtp, fromUserAddress, fromUserPass,recipients,subject,content); 32 * @author Jadic 33 * @created 2014-5-13 34 */ 35 public class JMail { 36 37 private String smtpHost;// smtp服务器地址 38 private String userName;// 发送方账号 39 private String userPass;// 发送方密码 40 private List<String> recipientList;// 收件人列表 41 42 private Message msg; 43 private boolean isMailConfigInited; 44 45 private final static String VALID_EMAIL_REGEX = "^[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,6}$"; 46 private final static Pattern VALID_EMAIL_PATTERN = Pattern.compile(VALID_EMAIL_REGEX, Pattern.CASE_INSENSITIVE); 47 48 private final static String SEND_MAIL_OK = "OK"; 49 private final static String SEND_MAIL_NO_RECIPIENTS = "Fail:no valid recipient set"; 50 51 private JMail(String smtp, String fromUserAddress, String fromUserPass) { 52 this.smtpHost = smtp; 53 this.userName = fromUserAddress; 54 this.userPass = fromUserPass; 55 56 recipientList = new ArrayList<String>(); 57 isMailConfigInited = false; 58 } 59 60 /** 61 * @param smtp smtp服务地址 62 * @param fromUserAddress 发件人邮箱账号 63 * @param fromUserPass 发件人邮箱密码 64 * @param recipient 收件人地址(列表),支持多个收件人以";"分割 65 */ 66 public JMail(String smtp, String fromUserAddress, String fromUserPass, String recipient) { 67 this(smtp, fromUserAddress, fromUserPass); 68 String[] recs = recipient.split(";"); 69 for (String rec : recs) { 70 if (isValidEmail(rec)) { 71 this.recipientList.add(rec); 72 } 73 } 74 } 75 76 /** 77 * @param smtp smtp服务地址 78 * @param fromUserAddress 发件人邮箱账号 79 * @param fromUserPass 发件人邮箱密码 80 * @param recipients 收件人地址列表 81 */ 82 public JMail(String smtp, String fromUserAddress, String fromUserPass, String... recipients) { 83 this(smtp, fromUserAddress, fromUserPass); 84 for (String recipient : recipients) { 85 if (isValidEmail(recipient)) { 86 this.recipientList.add(recipient); 87 } 88 } 89 } 90 91 /** 92 * @param smtp smtp服务地址 93 * @param fromUserAddress 发件人邮箱账号 94 * @param fromUserPass 发件人邮箱密码 95 * @param recipientList 收件人地址列表 96 */ 97 public JMail(String smtp, String fromUserAddress, String fromUserPass, List<String> recipientList) { 98 this(smtp, fromUserAddress, fromUserPass); 99 for (String recipient : recipientList) { 100 if (isValidEmail(recipient)) { 101 this.recipientList.add(recipient); 102 } 103 } 104 } 105 106 /** 107 * 发送邮件,主题默认"default" 108 * @param content 发送内容 109 * @return "ok" 成功发送，否则返回失败提示 110 */ 111 public String sendMail(String content) { 112 return sendMail("default", content); 113 } 114 115 /** 116 * @param subject 邮件主题 117 * @param content 邮件内容 118 * @return "ok" 成功发送，否则返回失败提示 119 */ 120 public String sendMail(String subject, String content) { 121 if (this.recipientList.size() <= 0) { 122 return SEND_MAIL_NO_RECIPIENTS; 123 } 124 125 if (!isMailConfigInited) { 126 try { 127 initMailConfig(); 128 } catch (AddressException e) { 129 return "fail: address err[" + e.getMessage().trim() + "]"; 130 } catch (MessagingException e) { 131 return "fail: MessagingErr[" + e.getMessage().trim() + "]"; 132 } 133 } 134 try { 135 msg.setSentDate(new Date()); 136 } catch (MessagingException e) { 137 e.printStackTrace(); 138 } 139 try { 140 msg.setSubject(MimeUtility.encodeText(subject, "gbk", "B")); 141 142 MimeMultipart mmp = new MimeMultipart(); 143 MimeBodyPart mbp = new MimeBodyPart(); 144 mbp.setContent(content, "text/plain;charset=gbk"); 145 mmp.addBodyPart(mbp); 146 msg.setContent(mmp); 147 Transport.send(msg); 148 } catch (UnsupportedEncodingException e) { 149 return "fail: unsupported encoding[" + e.getMessage().trim() + "]"; 150 } catch (MessagingException e) { 151 return "fail: MessagingErr[" + e.getMessage().trim() + "]"; 152 } 153 154 return SEND_MAIL_OK; 155 } 156 157 private void initMailConfig() throws AddressException, MessagingException { 158 Properties props = new Properties(); 159 // 发送服务器需要身份验证 160 props.setProperty("mail.smtp.auth", "true"); 161 // 设置邮件服务器主机名 162 props.setProperty("mail.host", smtpHost); 163 // 发送邮件协议名称 164 props.setProperty("mail.transport.protocol", "smtp"); 165 166 Session session = Session.getInstance(props, new Authenticator() { 167 @Override 168 protected PasswordAuthentication getPasswordAuthentication() { 169 return new PasswordAuthentication(userName, userPass); 170 } 171 }); 172 msg = new MimeMessage(session); 173 msg.setFrom(new InternetAddress(userName)); 174 msg.addRecipients(Message.RecipientType.TO, getRecipients()); 175 isMailConfigInited = true; 176 } 177 178 /** 179 * 180 * @param smtp smtp地址 181 * @param fromUserAddress 发件人账号 182 * @param fromUserPass 发件人账号密码 183 * @param recipients 收件人(列表),多个收件人以";"分割 184 * @param subject 邮件主题 185 * @param content 邮件内容 186 * @return "ok" 成功发送，否则返回失败提示 187 */ 188 public static String sendMail(String smtp, String fromUserAddress, String fromUserPass, String recipients, String subject, 189 String content) { 190 final String userName = fromUserAddress; 191 final String userPass = fromUserPass; 192 Properties props = new Properties(); 193 // 发送服务器需要身份验证 194 props.setProperty("mail.smtp.auth", "true"); 195 // 设置邮件服务器主机名 196 props.setProperty("mail.host", smtp); 197 // 发送邮件协议名称 198 props.setProperty("mail.transport.protocol", "smtp"); 199 200 Session session = Session.getInstance(props, new Authenticator() { 201 @Override 202 protected PasswordAuthentication getPasswordAuthentication() { 203 return new PasswordAuthentication(userName, userPass); 204 } 205 }); 206 Message msg = new MimeMessage(session); 207 try { 208 msg.setFrom(new InternetAddress(userName)); 209 String[] recipientAry = recipients.split(";"); 210 InternetAddress[] recipientsAddress = new InternetAddress[recipientAry.length]; 211 for (int i = 0; i < recipientAry.length; i++) { 212 if (isValidEmail(recipientAry[i])) { 213 recipientsAddress[i] = new InternetAddress(recipientAry[i]); 214 } 215 } 216 msg.addRecipients(Message.RecipientType.TO, recipientsAddress); 217 msg.setSentDate(new Date()); 218 msg.setSubject(MimeUtility.encodeText(subject, "gbk", "B")); 219 220 MimeMultipart mmp = new MimeMultipart(); 221 MimeBodyPart mbp = new MimeBodyPart(); 222 mbp.setContent(content, "text/plain;charset=gbk"); 223 mmp.addBodyPart(mbp); 224 msg.setContent(mmp); 225 Transport.send(msg); 226 } catch (UnsupportedEncodingException e) { 227 return "fail: unsupported encoding[" + e.getMessage().trim() + "]"; 228 } catch (MessagingException e) { 229 return "fail: MessagingErr[" + e.getMessage().trim() + "]"; 230 } 231 232 return SEND_MAIL_OK; 233 } 234 235 private InternetAddress[] getRecipients() throws AddressException { 236 if (recipientList.size() > 0) { 237 InternetAddress[] recipients = new InternetAddress[recipientList.size()]; 238 for (int i = 0; i < recipients.length; i++) { 239 recipients[i] = new InternetAddress(this.recipientList.get(i)); 240 } 241 return recipients; 242 } 243 return new InternetAddress[0]; 244 } 245 246 private static boolean isValidEmail(String email) { 247 return email != null && VALID_EMAIL_PATTERN.matcher(email).find(); 248 } 249 }