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程序入口：
Test_Email_N.java

import java.io.IOException;
import java.util.Date;
import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

public class Test_Email_N {
    public static void main(String args[]){
        try {
            send_email();
        }catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void send_email() throws IOException, AddressException, MessagingException{

        String to = "1219999@qq.com";
        String subject = "subject";
        String content = "content";
        Properties properties = new Properties();
        properties.put("mail.smtp.host", "smtp.qq.com");
        properties.put("mail.smtp.port", "25");
        properties.put("mail.smtp.auth", "true");
        Authenticator authenticator = new Email_Authenticator("1219999@qq.com", "password");
        javax.mail.Session sendMailSession = javax.mail.Session.getDefaultInstance(properties, authenticator);
        MimeMessage mailMessage = new MimeMessage(sendMailSession);
        mailMessage.setFrom(new InternetAddress("1219999@qq.com"));
        // Message.RecipientType.TO屬性表示接收者的類型為TO
        mailMessage.setRecipient(Message.RecipientType.TO, new InternetAddress(to));
        mailMessage.setSubject(subject, "UTF-8");
        mailMessage.setSentDate(new Date());
        // MiniMultipart類是一個容器類，包含MimeBodyPart類型的對象
        Multipart mainPart = new MimeMultipart();
        // 創建一個包含HTML內容的MimeBodyPart
        BodyPart html = new MimeBodyPart();
        html.setContent(content.trim(), "text/html; charset=utf-8");
        mainPart.addBodyPart(html);
        mailMessage.setContent(mainPart);
        Transport.send(mailMessage);
    }
}

其中依賴的jar包為javax.mail,我這里是maven管理的，直接用maven去下載jar包,也可以到https://java.net/projects/javamail/pages/Home直接下載jar包.

復制代碼代碼如下:

	
	<dependency>

	            <groupId>javax.mail</groupId>

	            <artifactId>mail</artifactId>

	            <version>1.5.0-b01</version>

	        </dependency>

Email_Authenticator.java,這里繼承了Authenticator 類，用來封裝name,和password的：

復制代碼代碼如下:

package com.infomorrow.webtest.JuxinliTest.restdetect;

import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;
public class Email_Authenticator extends Authenticator {
    String userName = null;
    String password = null;
    public Email_Authenticator() {
    }
    public Email_Authenticator(String username, String password) {
        this.userName = username;
        this.password = password;
    }
    protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication(userName, password);
    }
}

配置就這么多，把郵箱密碼改成自己的就可以了，否則會報錯。程序到這就可以運行了！

下面介紹的是配置properties文件來管理賬號密碼:

新建一個email.propertis文件。

email.propertis:

復制代碼代碼如下:

	
	mail.smtp.host=smtp.qq.com

	mail.smtp.port=25

	username=1219999@qq.com

	password=password

Test_Email.java 代碼改為如下：

復制代碼代碼如下:

package com.infomorrow.webtest.JuxinliTest.restdetect;

import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.Properties;

public class Test_Email {

　　public static void main(String args[]){
        try {
            send_email();
        }catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void send_email() throws IOException, AddressException, MessagingException{

        String to = "1215186706@qq.com";
        String subject = "subject";//郵件主題
        String content = "content";//郵件內容
        Properties properties = new Properties();
        InputStream resourceAsStream = null;
        try {
             resourceAsStream = Object.class.getResourceAsStream("/email.properties");
            properties.load(resourceAsStream);
        } finally{
            if (resourceAsStream!=null) {
                resourceAsStream.close();
            }
        }
        System.err.println("properties:"+properties);
        properties.put("mail.smtp.host", properties.get("mail.smtp.host"));
        properties.put("mail.smtp.port", properties.get("mail.smtp.port"));
        properties.put("mail.smtp.auth", "true");
        Authenticator authenticator = new Email_Authenticator(properties.get("username").toString(), properties.get("password").toString());
        javax.mail.Session sendMailSession = javax.mail.Session.getDefaultInstance(properties, authenticator);
        MimeMessage mailMessage = new MimeMessage(sendMailSession);
        mailMessage.setFrom(new InternetAddress(properties.get("username").toString()));
        // Message.RecipientType.TO屬性表示接收者的類型為TO
        mailMessage.setRecipient(Message.RecipientType.TO, new InternetAddress(to));
        mailMessage.setSubject(subject, "UTF-8");
        mailMessage.setSentDate(new Date());
        // MiniMultipart類是一個容器類，包含MimeBodyPart類型的對象
        Multipart mainPart = new MimeMultipart();
        // 創建一個包含HTML內容的MimeBodyPart
        BodyPart html = new MimeBodyPart();
        html.setContent(content.trim(), "text/html; charset=utf-8");
        mainPart.addBodyPart(html);
        mailMessage.setContent(mainPart);
        Transport.send(mailMessage);
    }
}