Android 使用javaMail jar包发送邮件到指定邮箱，并可以发送图片附件

Android发送邮件到指定邮箱一种是调用系统发邮件的软件，可以添加邮箱账号就可以发送邮件；第二种是使用javamail来发送邮件，使用javamail来发送邮件需要使用javaMail的jar包 mail.jar 、additionnal.jar 、activation.jar 这三个包。关键代码如下：

import java.io.File;import java.util.Date;import java.util.Properties;import javax.activation.DataHandler;import javax.activation.FileDataSource;import javax.mail.Message;import javax.mail.MessagingException;import javax.mail.Session;import javax.mail.Transport;import javax.mail.internet.AddressException;import javax.mail.internet.InternetAddress;import javax.mail.internet.MimeBodyPart;import javax.mail.internet.MimeMessage;import javax.mail.internet.MimeMultipart;/** * Created by Ryan on 2017/12/10. */public class EmailSender {    private Properties properties;    private Session session;    private Message message;    private MimeMultipart multipart;    public EmailSender() {        super();        this.properties = new Properties();    }    public void setProperties(String host,String post){        //地址        this.properties.put("mail.smtp.host",host);        //端口号        this.properties.put("mail.smtp.post",post);        //是否验证        this.properties.put("mail.smtp.auth",true);        this.session= Session.getInstance(properties);        this.message = new MimeMessage(session);        this.multipart = new MimeMultipart("mixed");    }    /**     * 设置收件人     * @param receiver     * @throws MessagingException     */    public void setReceiver(String[] receiver) throws MessagingException{        javax.mail.Address[] address = new InternetAddress[receiver.length];        for(int i=0;ilength;i++){            address[i] = new InternetAddress(receiver[i]);        }        this.message.setRecipients(Message.RecipientType.TO, address);    }    /**     * 设置邮件     * @param from 来源     * @param title 标题     * @param content 内容     * @throws AddressException     * @throws MessagingException     */    public void setMessage(String from,String title,String content) throws AddressException, MessagingException{        this.message.setFrom(new InternetAddress(from));        this.message.setSubject(title);        //纯文本的话用setText()就行，不过有附件就显示不出来内容了        MimeBodyPart textBody = new MimeBodyPart();        textBody.setContent(content,"text/html;charset=gbk");        this.multipart.addBodyPart(textBody);    }    /**     * 添加附件     * @param filePath 文件路径     * @throws MessagingException     */    public void addAttachment(String filePath) throws MessagingException {        FileDataSource fileDataSource = new FileDataSource(new File(filePath));        DataHandler dataHandler = new DataHandler(fileDataSource);        MimeBodyPart mimeBodyPart = new MimeBodyPart();        mimeBodyPart.setDataHandler(dataHandler);        mimeBodyPart.setFileName(fileDataSource.getName());        this.multipart.addBodyPart(mimeBodyPart);    }    /**     * 发送邮件     * @param host 地址     * @param account 账户名     * @param pwd 密码     * @throws MessagingException     */    public void sendEmail(String host,String account,String pwd) throws MessagingException{        //发送时间        this.message.setSentDate(new Date());        //发送的内容，文本和附件        this.message.setContent(this.multipart);        this.message.saveChanges();        //创建邮件发送对象，并指定其使用SMTP协议发送邮件        Transport transport=session.getTransport("smtp");        //登录邮箱        transport.connect(host,account,pwd);        //发送邮件        transport.sendMessage(message, message.getAllRecipients());        //关闭连接        transport.close();    }}

import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import java.io.File;import javax.mail.MessagingException;import javax.mail.internet.AddressException;public class SendMailActivity extends Activity {    private Button btnSend = null;    private static final String TAG = "SendMailActivity";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_send_mail);        btnSend = (Button) findViewById(R.id.btnSend);        btnSend.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                //耗时操作要起线程...有几个新手都是这个问题                new Thread(new Runnable() {                    @Override                    public void run() {                        try {                            EmailSender sender = new EmailSender();                            //设置服务器地址和端口，网上搜的到                            sender.setProperties("smtp.163.com", "25");                            //分别设置发件人，邮件标题和文本内容                            sender.setMessage("[email protected]", "This is title", "This is content！");                            //设置收件人的邮箱                            sender.setReceiver(new String[]{"[email protected]"});                            File file = new File("/sdcard/DCIM/Camera/IMG_20150917_141427.jpg");                            if(file.exists()) {                                Log.d(TAG,"file.exists()------>>>>>>");                                //添加附件                                //这个附件的路径是我手机里的啊，要发你得换成你手机里正确的路径                                sender.addAttachment("/sdcard/DCIM/Camera/IMG_20150917_141427.jpg");                            } else {                                Log.d(TAG,"file.notexists()------>>>>>>");                            }                            //发送邮件,sender.setMessage("你的163邮箱账号", "EmailS//ender", "Java Mail ！");这里面两个邮箱账号要一致                            sender.sendEmail("smtp.163.com", "[email protected]", "password");                        } catch (AddressException e) {                            // TODO Auto-generated catch block                            e.printStackTrace();                        } catch (MessagingException e) {                            // TODO Auto-generated catch block                            e.printStackTrace();                        }                    }                }).start();            }        });    }}

源码下载地址：https://github.com/Ryan-HANG/EMailSend.git

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