[英]Send mail without Gmail using javax mail
I'm trying to send an email without Gmail and using javax.mail
. 我正在尝试不使用Gmail并使用
javax.mail
发送电子邮件。 In particular, I use two files: mailSender.java
and the MainActivity
. 特别是,我使用两个文件:
mailSender.java
和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 = {"user1@hotmail.it", "user2@gmail.com"};
private String fromAddr = "from@gmail.com";
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;
}
In the MainActivity.java
: 在
MainActivity.java
:
mailSender sender = new mailSender("from@gmail.com","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()));
}
I insert the INTERNET
permission in manifest file and i ping correctly smtp.gmail.com
, but the application generate this exception: 我在清单文件中插入
INTERNET
权限,并正确ping smtp.gmail.com
,但应用程序生成此异常:
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
What is the problem? 问题是什么?
Try this it might help you. 试试这个可能对您有帮助。
mailSender sender = new mailSender("from@gmail.com","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) {
if(e.getMessage() != null)
Log.e("error", String.valueOf(e.getMessage()));
}
Your code seems correct, check if you're receiving the mail or not. 您的代码似乎正确,请检查您是否收到邮件。 The exception occurs because there is no message relating to the exception.
发生异常是因为没有与该异常有关的消息。 Try this to avoid the
NullPointerException
: 尝试这样做以避免
NullPointerException
:
Log.e("error", String.valueOf(e));
Update: For better a logic regarding exception handling using javamail, follow this: 更新:有关使用javamail进行异常处理的更好逻辑,请遵循以下步骤:
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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