android后台发送Email(不借助Intent)
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Android的SDK使得它很容易从一个应用程序发送电子邮件,但只能通过Intent的方法,就是通过内置的邮件应用程序。这能满足大多数的需求,但如果你想在后台发送,就不行了。
在这篇文章中,我将告诉你怎样在没有用户干预的情况下,在后台发送一封电子邮件。
这是所有Gmail(谷歌)SMTP服务器连接。
在这篇文章中,我将告诉你怎样在没有用户干预的情况下,在后台发送一封电子邮件。
开始之前需要先下载一个特殊版本的JavaMail API,这是专门为Android编写的。
http://code.google.com/p/javamail-android/downloads/list
如果你被墙屏蔽了,也可以去这里下载,里面的附件里有全部需要的东西,包括如何在Android应用的Activity中使用:
http://download.csdn.net/detail/jacklce/4896856
我们开始吧,下面是对邮件发送功能的封装,使用这些方法可以很容易地发送电子邮件,甚至可以添加附件。
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 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); } 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 ….. }
And now I'm going to go through each bit of code
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; }
在这段代码中,我们初始化了类mail属性,并设置为默认值。
另外,里面的JavaMail MIME类型需要注意看。里面有一个注释说明。
里面的两个2个构造函数也要仔细看,你可以通过其中一个传递用户名跟密码进去。
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; } }
这是发送的方法,里面有设置了数据属性,然后执行了发送操作。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); }
这是添加附件的函数,不过需要在发送之前调用。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; }
在这里,我们设置了邮件认证的属性 - 默认是SMTP认证。这是所有Gmail(谷歌)SMTP服务器连接。
完整代码: http://download.csdn.net/detail/jacklce/4896961
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