【Android】发送Email(内置Gmail和JavaMail)

Android发送Email的两种方法：

 

方法一：通过Intent调用内置的Gmail发送邮件

优点：简单、方便

缺点：缺少灵活性，只能使用关联的gmail发送邮件

 

示例代码：

 

 

String[] recipients = {"接收方邮件地址", "接收方邮件地址"};
String subject = "邮件标题";
String text = "邮件内容";
Intent intent = new Intent();
intent.setAction(Intent.ACTION_SEND);
intent.putExtra(Intent.EXTRA_EMAIL, recipients);
intent.putExtra(Intent.EXTRA_SUBJECT, subject);
intent.putExtra(Intent.EXTRA_TEXT, text);
startActivity(Intent.createChooser(intent, "Sending..."));

 

方法二：使用JavaMail发送邮件

优点：灵活

缺点：复杂，配置麻烦

 

配置步骤：

 

1. 下载Android版本JavaMail包，additional.jar、mail.jar和activation.jar，下载地址JavaMail-Android

2. 在项目与src同一目录级别下，新建文件夹lib，将下载的3个jar包放入该文件夹

3. 右键->Properties->Java Build Path->Libraries，选择Add External JARs，找到项目下lib目录的3个jar包

实现步骤：

 

1. 建立与邮件服务器间的会话Session

2. 构建邮件消息MINEMessage

3. Transport发送邮件

注意：

AndroidManifest下添加网络权限

配置会话Session的Properties时，值为String型"true"和"false"，而不是布尔型

 

 

示例代码：

 

package dyingbleed.iteye;

import java.util.Properties;

import javax.activation.DataHandler;
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;
import javax.mail.util.ByteArrayDataSource;

public class MailSender extends Authenticator {
	
	public static final String host = "smtp.gmail.com"; 
	
	private final String userName;
	private final String password;
	
	private Session session;
	
	public MailSender(String userName, String password) {
		this.userName = userName;
		this.password = password;
		
		initialize(); //初始化
	}
	
	private void initialize() {
		Properties props = new Properties();
		props.setProperty("mail.transport.protocol", "smtp");
		props.setProperty("mail.host", host);
		props.put("mail.smtp.auth", true);
		
		session = Session.getDefaultInstance(props, this);
	}

	@Override
	protected PasswordAuthentication getPasswordAuthentication() {
		return new PasswordAuthentication(userName, password);
	}
	
	/**
	 * 发送Email
	 * @param subject 标题
	 * @param body 内容
	 * @param sender 发送者
	 * @param recipients 接收者
	 * @throws MessagingException 
	 * @throws AddressException 
	 * */
	public synchronized void sendMail(String subject, String body, String sender, String recipients) throws AddressException, MessagingException {
		MimeMessage message = new MimeMessage(session);
		DataHandler handler = new DataHandler(new ByteArrayDataSource(body.getBytes(), "text/plain"));
		
		/*
		 * 设置MIME消息
		 * */
		message.setSender(new InternetAddress(sender));
		message.setSubject(subject);
		message.setDataHandler(handler);
		if(recipients.contains(",")) {
			message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipients));
		} else {
			message.setRecipient(Message.RecipientType.TO, new InternetAddress(recipients));
		}
		
		Transport.send(message); //发送
	}
}