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>