使用的javax邮箱发送邮件的Gmail无 [英] Send mail without Gmail using javax mail

问题描述

我试图发送电子邮件没有Gmail和使用 javax.mail 。特别是，我用两个文件：
mailSender.java 和 MainActivity 。

I'm trying to send an email without Gmail and using javax.mail. In particular, I use two files: mailSender.java and the MainActivity.

mailSender.java

mailSender.java:

package com.polito.gmail;

import java.util.Date;
import java.util.Properties;

import javax.activation.CommandMap;
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 mailSender extends javax.mail.Authenticator {
    private String _user;
    private String _pass;

    private String[] destAddr = {"[e-mail]", "[e-mail]"};
    private String fromAddr = "[e-mail]";

    private String _port;
    private String _sport;

    private String _host;

    private String _subject = "New Mail";
    private String _body;

    private boolean _auth;

    private boolean _debuggable;

    private Multipart _multipart;

    public mailSender() {
        _host = "smtp.gmail.com"; // default smtp server
        _port = "465"; // default smtp port
        _sport = "465"; // default socketfactory port

        _user = ""; // username
        _pass = ""; // password
        _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 mailSender(String user, String pass) {
        this();
        _user = user;
        _pass = pass;
    }

    public boolean send() throws Exception {
        Properties props = _setProperties();

        if (!_user.equals("") && !_pass.equals("") && destAddr.length > 0
                && !fromAddr.equals("") && !_subject.equals("")
                && !_body.equals("")) {
            Session session = Session.getInstance(props, this);

            MimeMessage msg = new MimeMessage(session);

            msg.setFrom(new InternetAddress(fromAddr));

            InternetAddress[] addressTo = new InternetAddress[destAddr.length];
            for (int i = 0; i < destAddr.length; i++) {
                addressTo[i] = new InternetAddress(destAddr[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;
        }
    }

    @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", "false");
        }

        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;
    }

在 MainActivity.java

In the MainActivity.java:

mailSender sender = new mailSender("[e-mail]","password");
        sender.setBody(prepareBody());
        try {

            if(sender.send()) { 
                    Toast.makeText(MainActivity.this, "Mail send", Toast.LENGTH_LONG).show();
                } else { 
                    Toast.makeText(MainActivity.this, "Mail not send", Toast.LENGTH_LONG).show();
                } 
} catch (Exception e) {
            Log.e("error", String.valueOf(e.getMessage()));
        }

我插入互联网清单文件许可和我正确执行ping smtp.gmail.com ，但应用程序产生这种异常：

I insert the INTERNET permission in manifest file and i ping correctly smtp.gmail.com, but the application generate this exception:

01-10 11:06:52.238: E/AndroidRuntime(2001): FATAL EXCEPTION: main
01-10 11:06:52.238: E/AndroidRuntime(2001): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.polito.gmail/com.polito.gmail.MainActivity}: java.lang.NullPointerException
01-10 11:06:52.238: E/AndroidRuntime(2001):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2185)
01-10 11:06:52.238: E/AndroidRuntime(2001):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2210)
01-10 11:06:52.238: E/AndroidRuntime(2001):     at android.app.ActivityThread.access$600(ActivityThread.java:142)
01-10 11:06:52.238: E/AndroidRuntime(2001):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1208)
01-10 11:06:52.238: E/AndroidRuntime(2001):     at android.os.Handler.dispatchMessage(Handler.java:99)
01-10 11:06:52.238: E/AndroidRuntime(2001):     at android.os.Looper.loop(Looper.java:137)
01-10 11:06:52.238: E/AndroidRuntime(2001):     at android.app.ActivityThread.main(ActivityThread.java:4931)
01-10 11:06:52.238: E/AndroidRuntime(2001):     at java.lang.reflect.Method.invokeNative(Native Method)
01-10 11:06:52.238: E/AndroidRuntime(2001):     at java.lang.reflect.Method.invoke(Method.java:511)
01-10 11:06:52.238: E/AndroidRuntime(2001):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
01-10 11:06:52.238: E/AndroidRuntime(2001):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
01-10 11:06:52.238: E/AndroidRuntime(2001):     at dalvik.system.NativeStart.main(Native Method)
01-10 11:06:52.238: E/AndroidRuntime(2001): Caused by: java.lang.NullPointerException
01-10 11:06:52.238: E/AndroidRuntime(2001):     at com.polito.gmail.MainActivity.onCreate(MainActivity.java:48)
01-10 11:06:52.238: E/AndroidRuntime(2001):     at android.app.Activity.performCreate(Activity.java:5008)
01-10 11:06:52.238: E/AndroidRuntime(2001):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
01-10 11:06:52.238: E/AndroidRuntime(2001):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2139)
01-10 11:06:52.238: E/AndroidRuntime(2001):     ... 11 more

这是什么问题？

推荐答案

您code似乎是正确的，请检查您收到邮件或没有。发生异常，因为没有涉及到异常没有消息。试试这个，以避免 NullPointerException异常：

Your code seems correct, check if you're receiving the mail or not. The exception occurs because there is no message relating to the exception. Try this to avoid the NullPointerException:

Log.e("error", String.valueOf(e));

更新：
为了更好的使用JavaMail有关的异常处理逻辑，遵循此：

Update: For better a logic regarding exception handling using javamail, follow this:

            try {
                sender.send();
               Toast.makeText(MainActivity.this, "Mail send", Toast.LENGTH_LONG).show();
            }
            catch (Exception e) {                   

                if (e.toString().equals("java.lang.NullPointerException"))                      
                    Toast.makeText(MainActivity.this, "Mail not send: Mail settings not configured", Toast.LENGTH_LONG).show();

                else if (e.toString().equals("javax.mail.AuthenticationFailedException"))                       
                    Toast.makeText(MainActivity.this, "Mail not send: Wrong Username or Password", Toast.LENGTH_LONG).show();

                else if (e.toString().equals("Invalid Addresses"))                      
                    Toast.makeText(MainActivity.this, "Mail not send: Invalid Address(es)", Toast.LENGTH_LONG).show();

                else
                    Toast.makeText(MainActivity.this, "Mail not send", Toast.LENGTH_LONG).show();                   

                }

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