Android使用Javamail发送Email群发加附件

package com.example.mailtest;
import java.util.Date; 
import java.util.Properties; 
import javax.activation.CommandMap; 
import javax.activation.DataHandler; 
import javax.activation.DataSource; 
import javax.activation.FileDataSource; 
import javax.activation.MailcapCommandMap; 
import javax.mail.BodyPart; 
import javax.mail.Multipart; 
import javax.mail.PasswordAuthentication; 
import javax.mail.Session; 
import javax.mail.Transport; 
import javax.mail.internet.InternetAddress; 
import javax.mail.internet.MimeBodyPart; 
import javax.mail.internet.MimeMessage; 
import javax.mail.internet.MimeMultipart; 
public class Mail extends javax.mail.Authenticator { 
private String _user; 
private String _pass; 
private String[] _to; 
private String _from; 
private String _port; 
private String _sport; 
private String _host; 
private String _subject; 
private String _body; 
private boolean _auth; 
private boolean _debuggable; 
private Multipart _multipart; 
public Mail() { 
_host = "smtp.gmail.com"; // default smtp server 
_port = "465"; // default smtp port 
_sport = "465"; // default socketfactory port 
_user = ""; // username 
_pass = ""; // password 
_from = ""; // email sent from 
_subject = ""; // email subject 
_body = ""; // email body 
_debuggable = false; // debug mode on or off - default off 
_auth = true; // smtp authentication - default on 
_multipart = new MimeMultipart(); 
// There is something wrong with MailCap, javamail can not find a handler for the multipart/mixed part, so this bit needs to be added. 
MailcapCommandMap mc = (MailcapCommandMap) CommandMap.getDefaultCommandMap(); 
mc.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html"); 
mc.addMailcap("text/xml;; x-java-content-handler=com.sun.mail.handlers.text_xml"); 
mc.addMailcap("text/plain;; x-java-content-handler=com.sun.mail.handlers.text_plain"); 
mc.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed"); 
mc.addMailcap("message/rfc822;; x-java-content-handler=com.sun.mail.handlers.message_rfc822"); 
CommandMap.setDefaultCommandMap(mc); 
} 
public Mail(String user, String pass) { 
this(); 
_user = user; 
_pass = pass; 
} 
public void setTo(String[] toArr) {
this._to = toArr;
}
public void setFrom(String string) {
this._from = string;
}
public void setSubject(String string) {
this._subject = string;
}
public boolean send() throws Exception { 
Properties props = _setProperties(); 
if(!_user.equals("") && !_pass.equals("") && _to.length   0 && !_from.equals("") && !_subject.equals("") && !_body.equals("")) { 
Session session = Session.getInstance(props, this); 
MimeMessage msg = new MimeMessage(session); 
msg.setFrom(new InternetAddress(_from)); 
InternetAddress[] addressTo = new InternetAddress[_to.length]; 
for (int i = 0; i < _to.length; i++) { 
addressTo[i] = new InternetAddress(_to[i]); 
} 
msg.setRecipients(MimeMessage.RecipientType.TO, addressTo); 
msg.setSubject(_subject); 
msg.setSentDate(new Date()); 
// setup message body 
BodyPart messageBodyPart = new MimeBodyPart(); 
messageBodyPart.setText(_body); 
_multipart.addBodyPart(messageBodyPart); 
// Put parts in message 
msg.setContent(_multipart); 
// send email 
Transport.send(msg); 
return true; 
} else { 
return false; 
} 
} 
public void addAttachment(String filename) throws Exception { 
BodyPart messageBodyPart = new MimeBodyPart(); 
DataSource source = new FileDataSource(filename); 
messageBodyPart.setDataHandler(new DataHandler(source)); 
messageBodyPart.setFileName(filename); 
_multipart.addBodyPart(messageBodyPart); 
} 
@Override 
public PasswordAuthentication getPasswordAuthentication() { 
return new PasswordAuthentication(_user, _pass); 
} 
private Properties _setProperties() { 
Properties props = new Properties(); 
props.put("mail.smtp.host", _host); 
if(_debuggable) { 
props.put("mail.debug", "true"); 
} 
if(_auth) { 
props.put("mail.smtp.auth", "true"); 
} 
props.put("mail.smtp.port", _port); 
props.put("mail.smtp.socketFactory.port", _sport); 
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory"); 
props.put("mail.smtp.socketFactory.fallback", "false"); 
return props; 
} 
// the getters and setters 
public String getBody() { 
return _body; 
} 
public void setBody(String _body) { 
this._body = _body; 
} 
// more of the getters and setters ….. 
} 

package com.example.mailtest;
import java.util.Properties;
import javax.mail.Address;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.app.ProgressDialog;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class MailActivity extends Activity {
private Button sendBtn;
private String username;
private String password;
private Handler sendHandler;
private ProgressDialog progressDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mail);
sendBtn=(Button)findViewById(R.id.btnSend);
sendHandler = new Handler();
sendBtn.setOnClickListener(new View.OnClickListener() { 
public void onClick(View v) { 
SendTask sTask = new SendTask(); 
sTask.execute();
} 
}); 
} 
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_mail, menu);
return true;
}
class SendTask extends AsyncTask<Integer, Integer, String { 
//后面尖括号内分别是参数（例子里是线程休息时间），进度(publishProgress用到)，返回值 类型 
@Override 
protected void onPreExecute() { 
//第一个执行方法 
Toast.makeText(getApplicationContext(), "Begin Send!", Toast.LENGTH_SHORT).show(); 
super.onPreExecute(); 
} 
@Override 
protected String doInBackground(Integer... params) { 
//第二个执行方法,onPreExecute()执行完后执行 
// TODO Auto-generated method stub 
Mail m = new Mail("empty.shen@gmail.com", "*****"); 
String[] toArr = {"silangquan@gmail.com","k283228391@126.com"}; 
m.setTo(toArr); 
m.setFrom("wooo@wooo.com"); 
m.setSubject("JavamailTest"); 
m.setBody("Email body."); 
try {
//If you want add attachment use function addAttachment.
//m.addAttachment("/sdcard/filelocation"); 
if(m.send()) { 
System.out.println("Email was sent successfully."); 
} else { 
System.out.println("Email was not sent.");
} 
} catch(Exception e) { 
//Toast.makeText(MailApp.this, "There was a problem sending the email.", Toast.LENGTH_LONG).show(); 
Log.e("MailApp", "Could not send email", e); 
}
return ""; 
} 
@Override 
protected void onProgressUpdate(Integer... progress) { 
//这个函数在doInBackground调用publishProgress时触发，虽然调用时只有一个参数 
//但是这里取到的是一个数组,所以要用progesss[0]来取值 
//第n个参数就用progress[n]来取值  
super.onProgressUpdate(progress); 
} 
@Override 
protected void onPostExecute(String r) { 
//doInBackground返回时触发，换句话说，就是doInBackground执行完后触发 
//这里的result就是上面doInBackground执行后的返回值，所以这里是"执行完毕" 
//setTitle(result); 
super.onPostExecute(r); 
} 
} 
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MailActivity"  
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="@string/hello_world" / 
<Button
android:id="@+id/btnSend"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="19dp"
android:text="Send" / 
</RelativeLayout