android app利用javax.mail.Authenticator與java.security.Provider完成google gmail寄信的功能!

GMailSender.java

package com.example.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 android.util.Log;

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 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
    {
	try
	{
	    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);
	}
	catch (Exception e)
	{
	    Log.e("", e.getMessage());
	}
    }

    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");
	}

    }
}

JSSEProvider.java

package com.example.mail;

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

/**
 * @author Alexander Y. Kleymenov
 * @version $Revision$
 */

import java.security.AccessController;
import java.security.Provider;

public final class JSSEProvider extends Provider
{

    public JSSEProvider()
    {
	super("HarmonyJSSE", 1.0, "Harmony JSSE Provider");
	AccessController.doPrivileged(new java.security.PrivilegedAction<Void>()
	{
	    public Void run()
	    {
		put("SSLContext.TLS", "org.apache.harmony.xnet.provider.jsse.SSLContextImpl");
		put("Alg.Alias.SSLContext.TLSv1", "TLS");
		put("KeyManagerFactory.X509", "org.apache.harmony.xnet.provider.jsse.KeyManagerFactoryImpl");
		put("TrustManagerFactory.X509", "org.apache.harmony.xnet.provider.jsse.TrustManagerFactoryImpl");
		return null;
	    }
	});
    }
}

MainActivity.java

package com.example.mail;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;

public class MainActivity extends Activity
{

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);
	GMailSender sender = new GMailSender("寄件者帳號", "寄件者密碼");
	try
	{
	    sender.sendMail("主旨", "內容", "寄件者", "收件者");
	}
	catch (Exception e)
	{
	    // TODO 自動產生的 catch 區塊
	    e.printStackTrace();
	}
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
	// Inflate the menu; this adds items to the action bar if it is present.
	getMenuInflater().inflate(R.menu.main, menu);
	return true;
    }

}