Android 使用 SMTP 发送邮件

package org.apache.android.mail;

import javax.activation.DataHandler;  

import javax.activation.DataSource;  

import javax.mail.Message;  

import javax.mail.PasswordAuthentication;  

import javax.mail.Session;  

import javax.mail.Transport;  

import javax.mail.internet.InternetAddress;  

import javax.mail.internet.MimeMessage;  

import java.io.ByteArrayInputStream;  

import java.io.IOException;  

import java.io.InputStream;  

import java.io.OutputStream;  

import java.security.Security;  

import java.util.Properties;  

public class GMailSender extends javax.mail.Authenticator {  

    private String mailhost = "smtp.gmail.com";  

    private String user;  

    private String password;  

    private Session session;  

    static {  

        Security.addProvider(new org.apache.harmony.xnet.provider.jsse.JSSEProvider());  

    }  

    public GMailSender(String user, String password) {  

        this.user = user;  

        this.password = password;  

        Properties props = new Properties();  

        props.setProperty("mail.transport.protocol", "smtp");  

        props.setProperty("mail.host", mailhost);  

        props.put("mail.smtp.auth", "true");  

        props.put("mail.smtp.port", "465");  

        props.put("mail.smtp.socketFactory.port", "465");  

        props.put("mail.smtp.socketFactory.class",  

                "javax.net.ssl.SSLSocketFactory");  

        props.put("mail.smtp.socketFactory.fallback", "false");  

        props.setProperty("mail.smtp.quitwait", "false");  

        session = Session.getDefaultInstance(props, this);  

    }  

    protected PasswordAuthentication getPasswordAuthentication() {  

        return new PasswordAuthentication(user, password);  

    }  

    public synchronized void sendMail(String subject, String body, 

    String sender, String recipients) throws Exception {  

        MimeMessage message = new MimeMessage(session);  

        DataHandler handler = new DataHandler(new ByteArrayDataSource(body.getBytes(), "text/plain"));  

        message.setSender(new InternetAddress(sender));  

        message.setSubject(subject);  

        message.setDataHandler(handler);  

        if (recipients.indexOf(',') > 0)  

            message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipients));  

        else  

            message.setRecipient(Message.RecipientType.TO, new InternetAddress(recipients));  

        Transport.send(message);  

    }  

    public class ByteArrayDataSource implements DataSource {  

        private byte[] data;  

        private String type;  

        public ByteArrayDataSource(byte[] data, String type) {  

            super();  

            this.data = data;  

            this.type = type;  

        }  

        public ByteArrayDataSource(byte[] data) {  

            super();  

            this.data = data;  

        }  

        public void setType(String type) {  

            this.type = type;  

        }  

        public String getContentType() {  

            if (type == null)  

                return "application/octet-stream";  

            else  

                return type;  

        }  

        public InputStream getInputStream() throws IOException {  

            return new ByteArrayInputStream(data);  

        }  

        public String getName() {  

            return "ByteArrayDataSource";  

        }  

        public OutputStream getOutputStream() throws IOException {  

            throw new IOException("Not Supported");  

        }  

    }  

}