簡單發送郵件

jar包：

<!--發送郵件-->
<dependency>
 <groupId>javax.mail</groupId>
 <artifactId>javax.mail-api</artifactId>
 <version>1.5.5</version>
</dependency>
<dependency>
 <groupId>com.sun.mail</groupId>
 <artifactId>javax.mail</artifactId>
 <version>1.5.5</version>
</dependency>

EmailConfig:

package com.bwie.utils;


import java.util.Properties;

import static com.bwie.utils.PropterUtil.getProperties;

public class EmailConfig {
 private static EmailConfig email;
 private String from;
 private String user;
 private String pwd;
 private String host;

 public static EmailConfig initConfig() {

 if (email != null) {
 return email;
 } else {
 Properties p = getProperties("properties/jdbc.properties","utf-8");
 String from = p.getProperty("mail.smtp.from");
 String user = p.getProperty("mail.smtp.user");
 String pwd = p.getProperty("mail.smtp.pwd");
 String host = p.getProperty("mail.smtp.host");
 email = new EmailConfig(from,user,pwd,host);
 return email;
 }
 }


 public EmailConfig(String from, String user, String pwd, String host) {
 this.from = from;
 this.user = user;
 this.pwd = pwd;
 this.host = host;
 }

 public String getFrom() {
 return from;
 }

 public String getUser() {
 return user;
 }

 public String getPwd() {
 return pwd;
 }

 public String getHost() {
 return host;
 }

 public static EmailConfig getEmail() {
 return email;
 }

 public static void setEmail(EmailConfig email) {
 EmailConfig.email = email;
 }

 public void setFrom(String from) {
 this.from = from;
 }

 public void setUser(String user) {
 this.user = user;
 }

 public void setPwd(String pwd) {
 this.pwd = pwd;
 }

 public void setHost(String host) {
 this.host = host;
 }

 @Override
 public String toString() {
 return "EmailConfig{" +
 "from='" + from + '\'' +
 ", user='" + user + '\'' +
 ", pwd='" + pwd + '\'' +
 ", host='" + host + '\'' +
 '}';
 }
}

jdbc.properties：

mail.smtp.from=18333607118@163.com
mail.smtp.user=18333607118
mail.smtp.pwd=li201314
mail.smtp.host=smtp.163.com

SendEmailUtil：

package com.bwie.utils;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.util.ByteArrayDataSource;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Properties;

public class SendEmailUtil {

 /**
 * 發送郵件
 *
 * @param to
 * @param title
 * @param content
 * @return
 */
 public boolean sendEmail(String to, String title, String content) {
 return send(to, title, content, null, null, null);
 }

 /**
 * 發送帶附件的郵件
 *
 * @param to
 * @param title
 * @param content
 * @param affixPath
 * @param affixName
 * @return
 */
 public boolean sendEmail(String to, String title, String content, String affixPath, String affixName) {
 return send(to, title, content, affixPath, affixName, null);
 }

 /**
 * 發送帶附件的郵件，入參是文件流
 *
 * @param to
 * @param title
 * @param content
 * @param inputStream
 * @return
 */
 public boolean sendEmail(String to, String title, String content, InputStream inputStream) {
 return send(to, title, content, "", "", inputStream);
 }

 private boolean send(String to, String title, String content, String affixPath, String affixName, InputStream inputStream) {
 Properties props = new Properties();

 EmailConfig sendEmailUtil = EmailConfig.initConfig();
 // 設置發送郵件的郵件服務器的屬性（這裏使用網易的smtp服務器）
 //props.put("mail.smtp.host", this.host);
 props.put("mail.smtp.host", sendEmailUtil.getHost());
 // 須要通過受權，也就是有戶名和密碼的校驗，這樣才能經過驗證（必定要有這一條）
 props.put("mail.smtp.auth", "true");

 // 用剛剛設置好的props對象構建一個session
 Session session = Session.getDefaultInstance(props);

 // 有了這句即可以在發送郵件的過程當中在console處顯示過程信息，供調試使
 // 用（你能夠在控制檯（console)上看到發送郵件的過程）
 session.setDebug(false);

 // 用session爲參數定義消息對象
 MimeMessage message = new MimeMessage(session);
 try {
 // 加載發件人地址
 message.setFrom(new InternetAddress(sendEmailUtil.getFrom()));
 // 加載收件人地址
 message.addRecipients(Message.RecipientType.TO, to);
 List<InternetAddress> list = new ArrayList();//不能使用string類型的類型，這樣只能發送一個收件人
 String[] median = to.split(",");//對輸入的多個郵件進行逗號分割
 for (int i = 0; i < median.length; i++) {
 list.add(new InternetAddress(median[i]));
 }
 InternetAddress[] address = (InternetAddress[]) list.toArray(new InternetAddress[list.size()]);
 message.addRecipients(Message.RecipientType.TO, address);
 // 加載標題
 message.setSubject(title);

 // 向multipart對象中添加郵件的各個部份內容，包括文本內容和附件
 Multipart multipart = new MimeMultipart();

 // 設置郵件的文本內容
 BodyPart contentPart = new MimeBodyPart();
 contentPart.setText(content);
 multipart.addBodyPart(contentPart);
 // 添加附件
 BodyPart messageBodyPart = new MimeBodyPart();
 if (affixPath != null && !"".equals(affixPath)) {
 DataSource source = new FileDataSource(affixPath);
 // 添加附件的內容

 messageBodyPart.setDataHandler(new DataHandler(source));
 // 添加附件的標題
 // 這裏很重要，經過下面的Base64編碼的轉換能夠保證你的中文附件標題名在發送時不會變成亂碼
 sun.misc.BASE64Encoder enc = new sun.misc.BASE64Encoder();
 messageBodyPart.setFileName("=?GBK?B?" + enc.encode(affixName.getBytes()) + "?=");
 multipart.addBodyPart(messageBodyPart);
 } else {
 DataSource source = new ByteArrayDataSource(inputStream, "application/png");
 messageBodyPart.setDataHandler(new DataHandler(source));
 // 添加附件的標題
 // 這裏很重要，經過下面的Base64編碼的轉換能夠保證你的中文附件標題名在發送時不會變成亂碼
 sun.misc.BASE64Encoder enc = new sun.misc.BASE64Encoder();
 messageBodyPart.setFileName(new Date().getTime() + ".png");
 multipart.addBodyPart(messageBodyPart);
 }

 // 將multipart對象放到message中
 message.setContent(multipart);
 // 保存郵件
 message.saveChanges();
 // 發送郵件
 Transport transport = session.getTransport("smtp");
 // 鏈接服務器的郵箱
 transport.connect(sendEmailUtil.getHost(), sendEmailUtil.getUser(), sendEmailUtil.getPwd());
 // 把郵件發送出去
 transport.sendMessage(message, message.getAllRecipients());
 transport.close();
 return true;
 } catch (Exception e) {
 e.printStackTrace();
 return false;
 }
 }

 //測試發送郵件
 public static void main(String[] args) throws Exception {
 System.out.print("///////");
 SendEmailUtil cn = new SendEmailUtil();
 cn.sendEmail("1959241842@qq.com", "你幫我看看這張圖片啊", "幫我看下這個圖片，適合作頭像嗎", "f:\\1.png", "1.png"); }}