Android中 使用Javamail发送Email带群发加附件(绝对可用！)

之前写了一篇关于Android中发送Email的文章，里面用到的是隐式的intent来激活系统自带的邮件发送功能。

今天花了一天来自己实现这个邮件发送功能（主要是网上的代码太坑...）

这里用gmail作为发送方的邮箱，其他网易，新浪什么的应该也ok，QQ貌似不行。

资源来自：javamail-android

下面是实现步骤及相关代码。

项目添加jar包

将activation.jar,additionnal.jar,mail.jar放到项目的libs 文件夹。然后在项目中选中这三个包，右击->Build Path->Add to buildPath.

添加成功后项目就像这样.

项目中添加Mail类

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 ….. 
} 

MailActivity调用

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("[email protected]", "*****"); 

			String[] toArr = {"[email protected]","[email protected]"}; 
			m.setTo(toArr); 
			m.setFrom("[email protected]"); 
			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);    
		}    

	}    

}

这里用到了AsyncTask，应为直接在UI线程中连接互联网的话，或爆 android.os.NetworkOnMainThreadException异常。

 布局文件

主界面的布局文件，非常简单。

<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>

运行效果：

点击发送之后