前言：

時(shí)隔5年再次在項(xiàng)目中需要遠(yuǎn)程獲取設(shè)備上的Log信息來定位程序Bug的場景，應(yīng)用程序把Log以txt文本的形式存儲到指定SD卡的目錄下咆畏，然后通過遠(yuǎn)程給指定的設(shè)備發(fā)送一條讀取Log的消息（消息里帶有接收郵件的郵箱信息）來觸發(fā)讀取設(shè)備本地記錄的Log文本信息琐脏，然后通過發(fā)送帶附件郵件的形式發(fā)送到指定的接收郵箱里攒砖，實(shí)現(xiàn)遠(yuǎn)程讀取設(shè)備Log信息。

項(xiàng)目簡介：

項(xiàng)目是一個(gè)智能輪椅項(xiàng)目：1：藍(lán)牙通信實(shí)現(xiàn)手機(jī)端遙控功能日裙；2：攝像頭獲取視頻流上傳到服務(wù)器吹艇，手機(jī)端獲取視頻流數(shù)據(jù)查看輪椅周圍的環(huán)境；3：使用騰訊實(shí)時(shí)音視頻（TRTC）實(shí)現(xiàn)視頻通話功能昂拂；4：集成思必馳（DUI）SDK實(shí)現(xiàn)語音交互功能受神；

準(zhǔn)備工作

在編碼之前首先需要在我們的AS項(xiàng)目中的build.gradle的dependencies模塊里引入發(fā)送郵箱相關(guān)的依賴庫：

    // E_mail
    implementation 'com.sun.mail:android-mail:1.5.5'
    implementation 'com.sun.mail:android-activation:1.5.5'

然后在AndroidStudio的清單文件AndroidManifest.xml里添加網(wǎng)絡(luò)訪問權(quán)限及SD卡讀寫權(quán)限。

    <!-- 網(wǎng)絡(luò)權(quán)限 -->
    <uses-permission android:name="android.permission.INTERNET" />
     <!-- SD_Card權(quán)限 -->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

編碼

新建一個(gè)E_MailUtils.java的工具類政钟，把發(fā)送郵件的操作都放里面路克，直接上代碼：

package com.roy.www.smartbox.e_ｍail;

import android.os.Environment;
import android.util.Log;


import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
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.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeUtility;

/**
 * Created by Roy
 * On 2021/7/17
 * Email: 631934797@qq.com
 * Description: 利用JavaMail的API來創(chuàng)建和發(fā)送郵件工具類
 */

public class E_MailUtils {

    private static final String MAIL_SERVER = "smtp.163.com";
    private static final String MAILBOX = "******@163.com";//這里替換成自己的發(fā)送郵件的郵箱地址
    private static final String PASSWORD = "******";
    private E_MailInfoBean mEmailInfo;
    private String path;

    public E_MailUtils(String path){
        this.path = path;
    }

    /**
     * 以文本格式發(fā)送郵件
     * @param mailInfo 待發(fā)送的郵件信息
     * @return
     */
    public boolean sendTextEmail(E_MailInfoBean mailInfo){
        mEmailInfo = mailInfo;
        //判斷是否需要身份驗(yàn)證
        Properties properties = mailInfo.getProperties();
        //1、根據(jù)郵件會話屬性和密碼驗(yàn)證器構(gòu)造一個(gè)發(fā)送郵件的session
        Session sendMailSession  = Session.getDefaultInstance(properties);
        //開啟Session的debug模式养交，這樣就可以查看到程序發(fā)送Email的運(yùn)行狀態(tài)
        sendMailSession.setDebug(true);
        try {

            //2精算、通過session得到transport對象,以便連接郵箱并發(fā)送
            Transport transport = sendMailSession.getTransport();
            //3、使用郵箱的用戶名和密碼連上郵件服務(wù)器碎连，發(fā)送郵件時(shí)灰羽，發(fā)件人需要提交郵箱的用戶名和密碼給SMTP服務(wù)器，用戶名和密碼都通過驗(yàn)證之后才能夠正常發(fā)送郵件給收件人鱼辙。
            transport.connect(MAIL_SERVER, MAILBOX, PASSWORD );
            //4廉嚼、創(chuàng)建郵件消息
            Message mailMessage = createSimpleMail(sendMailSession);
            //5、發(fā)送郵件消息
            transport.sendMessage(mailMessage, mailMessage.getAllRecipients());
            transport.close();
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
        return false;
    }

    /**
     * 發(fā)送內(nèi)容帶有圖片的郵件
     *
     * @return
     */
    public boolean sendImageEmail(E_MailInfoBean mailInfo){
        mEmailInfo = mailInfo;
        Properties properties = mailInfo.getProperties();
        //1倒戏、根據(jù)郵件會話屬性和密碼驗(yàn)證器構(gòu)造一個(gè)發(fā)送郵件的session
        Session sendMailSession  = Session.getDefaultInstance(properties);
        //開啟Session的debug模式怠噪，這樣就可以查看到程序發(fā)送Email的運(yùn)行狀態(tài)
        sendMailSession.setDebug(true);
        try {

            //2、通過session得到transport對象,以便連接郵箱并發(fā)送
            Transport transport = sendMailSession.getTransport();
            //3杜跷、使用郵箱的用戶名和密碼連上郵件服務(wù)器傍念，發(fā)送郵件時(shí)矫夷，發(fā)件人需要提交郵箱的用戶名和密碼給SMTP服務(wù)器，用戶名和密碼都通過驗(yàn)證之后才能夠正常發(fā)送郵件給收件人憋槐。
            transport.connect(MAIL_SERVER, MAILBOX, PASSWORD );
            //4双藕、創(chuàng)建郵件消息
            Message mailMessage = createImageMail(sendMailSession);
            //5、發(fā)送郵件消息
            transport.sendMessage(mailMessage, mailMessage.getAllRecipients());
            transport.close();
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }

        return true;
    }
    /**
     * 發(fā)送帶有附件的郵件
     *
     * @param mailInfo
     * @return
     */
    public boolean sendAttachmentEmail(E_MailInfoBean mailInfo, ArrayList<String> list){
        mEmailInfo = mailInfo;
        Properties properties = mailInfo.getProperties();
        //1阳仔、根據(jù)郵件會話屬性和密碼驗(yàn)證器構(gòu)造一個(gè)發(fā)送郵件的session
        Session sendMailSession  = Session.getDefaultInstance(properties);
        //開啟Session的debug模式忧陪，這樣就可以查看到程序發(fā)送Email的運(yùn)行狀態(tài)
        sendMailSession.setDebug(true);
        try {
            //2、通過session得到transport對象,以便連接郵箱并發(fā)送
            Transport transport = sendMailSession.getTransport();
            //3近范、使用郵箱的用戶名和密碼連上郵件服務(wù)器嘶摊，發(fā)送郵件時(shí)，發(fā)件人需要提交郵箱的用戶名和密碼給SMTP服務(wù)器顺又，用戶名和密碼都通過驗(yàn)證之后才能夠正常發(fā)送郵件給收件人更卒。
            transport.connect(MAIL_SERVER, MAILBOX, PASSWORD );
            //4等孵、創(chuàng)建郵件消息
            Message mailMessage = createAttachmentMail(sendMailSession,list);
            //5稚照、發(fā)送郵件消息
            transport.sendMessage(mailMessage, mailMessage.getAllRecipients());
            transport.close();
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }

    /**
     * 發(fā)送復(fù)雜郵件
     * @param mailInfo
     */
    public void sendMixedEmail(E_MailInfoBean mailInfo, ArrayList<String> list){

        mEmailInfo = mailInfo;
        Properties properties = mailInfo.getProperties();
        //1、根據(jù)郵件會話屬性和密碼驗(yàn)證器構(gòu)造一個(gè)發(fā)送郵件的session
        Session sendMailSession  = Session.getDefaultInstance(properties);
        //開啟Session的debug模式俯萌，這樣就可以查看到程序發(fā)送Email的運(yùn)行狀態(tài)
        sendMailSession.setDebug(true);
        try {
            //2果录、通過session得到transport對象,以便連接郵箱并發(fā)送
            Transport transport = sendMailSession.getTransport();
            //3、使用郵箱的用戶名和密碼連上郵件服務(wù)器咐熙，發(fā)送郵件時(shí)弱恒，發(fā)件人需要提交郵箱的用戶名和密碼給SMTP服務(wù)器，用戶名和密碼都通過驗(yàn)證之后才能夠正常發(fā)送郵件給收件人棋恼。
            transport.connect(MAIL_SERVER, MAILBOX, PASSWORD );
            //4返弹、創(chuàng)建郵件消息
            Message mailMessage = createMixedMail(sendMailSession,list);
            //5、發(fā)送郵件消息
            transport.sendMessage(mailMessage, mailMessage.getAllRecipients());
            transport.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 創(chuàng)建復(fù)雜的郵件（包括圖片和多附件的郵件）
     * @param sendMailSession
     * @param list 是選中CSV文件的集合
     * @return
     */
    private Message createMixedMail(Session sendMailSession,ArrayList<String> list) {
        // 創(chuàng)建郵件
        MimeMessage message = null;
        try {
            message = new MimeMessage(sendMailSession);

            // 設(shè)置郵件的基本信息
            //創(chuàng)建郵件發(fā)送者地址
            Address from = new InternetAddress(mEmailInfo.getFromAddress());
            //設(shè)置郵件消息的發(fā)送者
            message.setFrom(from);
            //創(chuàng)建郵件的接受者地址爪飘，并設(shè)置到郵件消息中
            Address to = new InternetAddress(mEmailInfo.getToAddress());
            //設(shè)置郵件消息的接受者, Message.RecipientType.TO屬性表示接收者的類型為TO
            message.setRecipient(Message.RecipientType.TO, to);
            //郵件標(biāo)題
            message.setSubject(mEmailInfo.getSubject());

            // 正文
            MimeBodyPart text = new MimeBodyPart();
            text.setContent(mEmailInfo.getContent(),
                    "text/html;charset=UTF-8");

            /*// 圖片
            MimeBodyPart image = new MimeBodyPart();
            image.setDataHandler(new DataHandler(new FileDataSource(Environment.getExternalStorageDirectory().getPath()+"/貓咪.jpg")));
            image.setContentID("貓咪.jpg");*/

            // 附件1
            MimeBodyPart attach = new MimeBodyPart();
            DataHandler dh = new DataHandler(new FileDataSource(Environment.getExternalStorageDirectory().getPath()+"/zed_authorize.txt"));
            attach.setDataHandler(dh);
            attach.setFileName(dh.getName());

            // 附件2
            MimeBodyPart attach2 = new MimeBodyPart();
            DataHandler dh2 = new DataHandler(new FileDataSource(Environment.getExternalStorageDirectory().getPath()+"/error_log_z9.txt"));
            attach2.setDataHandler(dh2);
            attach2.setFileName(MimeUtility.encodeText(dh2.getName()));

            /*// 描述關(guān)系:正文和圖片
            MimeMultipart mp1 = new MimeMultipart();
            mp1.addBodyPart(image);
            mp1.setSubType("related");*/

            // 描述關(guān)系:正文和附件
            MimeMultipart mp2 = new MimeMultipart();
            mp2.addBodyPart(text);
            mp2.addBodyPart(attach);
            mp2.addBodyPart(attach2);

            /*// 代表正文的BodyPart
            MimeBodyPart content = new MimeBodyPart();
            content.setContent(mp1);
            mp2.addBodyPart(content);*/

            mp2.setSubType("mixed");
            message.setContent(mp2);
            message.saveChanges();

            // 將創(chuàng)建的Email寫入到E盤存儲
            //message.writeTo(new FileOutputStream("E:\\MixedMail.eml"));
        } catch (Exception e) {
            Log.e("TAG", "創(chuàng)建復(fù)雜郵件失敗");
            e.printStackTrace();
        }
        // 返回創(chuàng)建好的的郵件
        return message;

    }
    /**
     * 創(chuàng)建帶有附件的郵件
     * @param sendMailSession
     * @param list 選中的CSV文件的集合
     * @return
     */
    private Message createAttachmentMail(Session sendMailSession,ArrayList<String> list) {
        //創(chuàng)建郵件
        MimeMessage message = null;
        try {
            message = new MimeMessage(sendMailSession);
            // 設(shè)置郵件的基本信息
            //創(chuàng)建郵件發(fā)送者地址
            Address from = new InternetAddress(mEmailInfo.getFromAddress());
            //設(shè)置郵件消息的發(fā)送者
            message.setFrom(from);
            //創(chuàng)建郵件的接受者地址义起，并設(shè)置到郵件消息中
            Address to = new InternetAddress(mEmailInfo.getToAddress());
            //設(shè)置郵件消息的接受者, Message.RecipientType.TO屬性表示接收者的類型為TO
            message.setRecipient(Message.RecipientType.TO, to);
            //郵件標(biāo)題
            message.setSubject(mEmailInfo.getSubject());

            // 創(chuàng)建郵件正文，為了避免郵件正文中文亂碼問題师崎，需要使用CharSet=UTF-8指明字符編碼
            MimeBodyPart text = new MimeBodyPart();
            text.setContent(mEmailInfo.getContent(), "text/html;charset=UTF-8");

            // 創(chuàng)建容器描述數(shù)據(jù)關(guān)系
            MimeMultipart mp = new MimeMultipart();
            mp.addBodyPart(text);
            for (int i = 0; i < list.size(); i++) {
                // 創(chuàng)建郵件附件
                MimeBodyPart attach = new MimeBodyPart();
                DataHandler dh = new DataHandler(new FileDataSource(path + list.get(i)));
                attach.setDataHandler(dh);
                attach.setFileName(MimeUtility.encodeText(dh.getName()));
                mp.addBodyPart(attach);
            }
            mp.setSubType("mixed");
            message.setContent(mp);
            message.saveChanges();
            // 將創(chuàng)建的Email寫入到E盤存儲
            //message.writeTo(new FileOutputStream("E:\\attachMail.eml"));
        } catch (Exception e) {
            Log.e("TAG", "創(chuàng)建帶附件的郵件失敗");
            e.printStackTrace();
        }
        // 返回生成的郵件
        return message;
    }
    /**
     *生成一封郵件正文帶圖片的郵件
     * @param sendMailSession
     * @return
     */
    private MimeMessage createImageMail(Session sendMailSession) {
        //創(chuàng)建郵件
        MimeMessage mailMessage = null;
        try {
            mailMessage = new MimeMessage(sendMailSession);
            // 設(shè)置郵件的基本信息
            //創(chuàng)建郵件發(fā)送者地址
            Address from = new InternetAddress(mEmailInfo.getFromAddress());
            //設(shè)置郵件消息的發(fā)送者
            mailMessage.setFrom(from);
            //創(chuàng)建郵件的接受者地址默终，并設(shè)置到郵件消息中
            Address to = new InternetAddress(mEmailInfo.getToAddress());
            //設(shè)置郵件消息的接受者, Message.RecipientType.TO屬性表示接收者的類型為TO
            mailMessage.setRecipient(Message.RecipientType.TO, to);
            //郵件標(biāo)題
            mailMessage.setSubject(mEmailInfo.getSubject());
            // 準(zhǔn)備郵件數(shù)據(jù)
            // 準(zhǔn)備郵件正文數(shù)據(jù)
            MimeBodyPart text = new MimeBodyPart();
            text.setContent("這是一封郵件正文帶圖片<img src='cid:xxx.jpg'>的郵件", "text/html;charset=UTF-8");
            // 準(zhǔn)備圖片數(shù)據(jù)
            MimeBodyPart image = new MimeBodyPart();
            DataHandler dh = new DataHandler(new FileDataSource("src\\1.jpg"));
            image.setDataHandler(dh);
            image.setContentID("xxx.jpg");
            // 描述數(shù)據(jù)關(guān)系
            MimeMultipart mm = new MimeMultipart();
            mm.addBodyPart(text);
            mm.addBodyPart(image);
            mm.setSubType("related");
            mailMessage.setContent(mm);
            mailMessage.saveChanges();
            //將創(chuàng)建好的郵件寫入到E盤以文件的形式進(jìn)行保存
            mailMessage.writeTo(new FileOutputStream("E:\\ImageMail.eml"));
            //返回創(chuàng)建好的郵件
        } catch (Exception e) {
            Log.e("TAG", "創(chuàng)建帶有圖片的郵件消息失敗");
            e.printStackTrace();
        }
        return mailMessage;
    }
    /**
     * 創(chuàng)建純文本內(nèi)容的郵件消息
     * @param sendMailSession
     * @return
     */
    public MimeMessage createSimpleMail(Session sendMailSession){
        MimeMessage mailMessage = null;
        try {
            //根據(jù)session創(chuàng)建一條郵件信息
            mailMessage = new MimeMessage(sendMailSession);
            //創(chuàng)建郵件發(fā)送者地址
            Address from = new InternetAddress(mEmailInfo.getFromAddress());
            //設(shè)置郵件消息的發(fā)送者
            mailMessage.setFrom(from);
            //創(chuàng)建郵件的接受者地址，并設(shè)置到郵件消息中
            Address to = new InternetAddress(mEmailInfo.getToAddress());
            //設(shè)置郵件消息的接受者, Message.RecipientType.TO屬性表示接收者的類型為TO
            mailMessage.setRecipient(Message.RecipientType.TO, to);
            //設(shè)置郵件標(biāo)題
            mailMessage.setSubject(mEmailInfo.getSubject());
            //設(shè)置郵件內(nèi)容
            mailMessage.setText(mEmailInfo.getContent());
            //設(shè)置郵件發(fā)送的時(shí)間
            mailMessage.setSentDate(new Date());
        } catch (Exception e) {
            Log.e("TAG", "郵件消息創(chuàng)建失敗");
            e.printStackTrace();
        }
        return mailMessage;
    }
}

再新建一個(gè)E_MailInfoBean.java的實(shí)體類犁罩，用來配置郵件配置信息齐蔽，也是直接上代碼：

package com.roy.www.smartbox.e_ｍail;

import java.util.Properties;

/**
 * Created by Roy
 * On 2021/7/17
 * Email: 631934797@qq.com
 * Description: 
 */

public class E_MailInfoBean {
    /**
     * 發(fā)送郵件的服務(wù)器的IP和端口
     */
    private String mailServerHost;
    private String mailServerPort;
    /**
     * 郵件發(fā)送者的郵件地址
     */
    private String fromAddress;
    /**
     * 郵件接受者的郵件地址
     */
    private String toAddress;
    /**
     * 登陸郵件發(fā)送服務(wù)器的用戶名和密碼
     */
    private String userName;
    private String passWord;
    /**
     * 是否需要身份驗(yàn)證
     */
    private boolean validate = false;
    /**
     * 郵件發(fā)送的主題
     */
    private String subject;
    /**
     * 郵件發(fā)送的內(nèi)容
     */
    private String content;
    /**
     * 郵件附件的文件名
     */
    private String[] attachFileNames;

    /**
     * 獲取郵件會話屬性
     * @return
     */
    public Properties getProperties(){
        Properties p = new Properties();
        p.put("mail.smtp.host", this.mailServerHost);
        p.put("mail.smtp.port", this.mailServerPort);
        p.put("mail.transport.protocol", "smtp");
        p.put("mail.smtp.auth", validate ? "true" : "false");
        return p;
    }

    public String getMailServerHost() {
        return mailServerHost;
    }

    public void setMailServerHost(String mailServerHost) {
        this.mailServerHost = mailServerHost;
    }

    public String getMailServerPost() {
        return mailServerPort;
    }

    public void setMailServerPost(String mailServerPost) {
        this.mailServerPort = mailServerPost;
    }

    public String getFromAddress() {
        return fromAddress;
    }

    public void setFromAddress(String fromAddress) {
        this.fromAddress = fromAddress;
    }

    public String getToAddress() {
        return toAddress;
    }

    public void setToAddress(String toAddress) {
        this.toAddress = toAddress;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassWord() {
        return passWord;
    }

    public void setPassWord(String passWord) {
        this.passWord = passWord;
    }

    public boolean isValidate() {
        return validate;
    }

    public void setValidate(boolean validate) {
        this.validate = validate;
    }

    public String getSubject() {
        return subject;
    }

    public void setSubject(String subject) {
        this.subject = subject;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public String[] getAttachFileNames() {
        return attachFileNames;
    }

    public void setAttachFileNames(String[] attachFileNames) {
        this.attachFileNames = attachFileNames;
    }
}

以上就是核心代碼，這里在再把發(fā)送郵件的代碼也給附上：

/**
     *  發(fā)送郵件
     *
     * @param jsonResult
     */
    private static void sendE_Mail( String jsonResult) {
        // 先創(chuàng)建一個(gè)實(shí)體來配置郵件信息
        E_MailInfoBean info = new E_MailInfoBean();
        info.setMailServerHost("smtp.163.com");
        info.setMailServerPost("25");
        info.setValidate(true);
        info.setUserName("******@163.com");//郵箱
        info.setPassWord("******");//郵箱密碼
        info.setFromAddress("******@163.com");//發(fā)送郵件郵箱地址
        // 設(shè)置收件人郵箱（這里是從消息數(shù)據(jù)里獲取的）
        info.setToAddress(GsonUtil.acceptAndStopField(jsonResult,"mailbox"));
        // 設(shè)置郵件主題
        info.setSubject("Smart_Box_" + BoxApplication.Device_ID + "客戶端LOG_INFO");
        // 設(shè)置郵件內(nèi)容
        info.setContent("Smart_Box_" + BoxApplication.Device_ID + "客戶端日志信息床估。 祥見附件含滴！");
        // 獲取所有制定目錄下的所有Log文本
        ArrayList<String> fileName = SDCardUtil.readAllFile(Constant.SMART_BOX_LOG_PATH);
        // 這個(gè)類用來發(fā)送郵件 是否成功
        boolean state = new E_MailUtils(Constant.SMART_BOX_LOG_PATH).sendAttachmentEmail(info, fileName);
        Map<String, Object> map = new HashMap<>();
        map.put("state", state ? "success" : "err");
        map.put("device_id", BoxApplication.Device_ID);
        map.put("command", GsonUtil.acceptAndStopField(jsonResult,"command") + "_ack");
        map.put("protocol", GsonUtil.acceptAndStopField(jsonResult,"protocol"));
        String responseMsg = GsonUtil.ObjectToString(map);
        //響應(yīng)數(shù)據(jù)
        BoxMqttService.publishMessage(responseMsg);
    }

以上就是使用android-mail發(fā)送郵件給指定接收郵箱的核心代碼；

注：用來發(fā)送郵件的郵箱需要開啟相關(guān)的服務(wù)丐巫，這里就自行百度設(shè)置一下即可谈况；