Miles' Blog

天涯何處無幹話,何必要講實務話

Email

要用 Android 寄送郵件有幾種方法:

解決方法一,可以用 Intent 來開啟對應 App 來寄信。

解決方法二,使用 Java native 寄信,需要 SMTP 伺服器的支援。

需要建立幾個 class

GmailSender.java

import javax.activation.DataHandler;   
import javax.activation.DataSource;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.Security;
import java.util.Properties;

public class GMailSender extends javax.mail.Authenticator {
private String mailhost = "smtp.gmail.com";
private String user;
private String password;
private Session session;

static {
Security.addProvider(new com.provider.JSSEProvider());
}

public GMailSender(String user, String password) {
this.user = user;
this.password = password;

Properties props = new Properties();
props.setProperty("mail.transport.protocol", "smtp");
props.setProperty("mail.host", mailhost);
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.port", "465");
props.put("mail.smtp.socketFactory.port", "465");
props.put("mail.smtp.socketFactory.class",
"javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.socketFactory.fallback", "false");
props.setProperty("mail.smtp.quitwait", "false");

session = Session.getDefaultInstance(props, this);
}

protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(user, password);
}

public synchronized void sendMail(String subject, String body, String sender, String recipients) throws Exception {
try{
MimeMessage message = new MimeMessage(session);
DataHandler handler = new DataHandler(new ByteArrayDataSource(body.getBytes(), "text/plain"));
message.setSender(new InternetAddress(sender));
message.setSubject(subject);
message.setDataHandler(handler);
if (recipients.indexOf(',') > 0)
message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipients));
else
message.setRecipient(Message.RecipientType.TO, new InternetAddress(recipients));
Transport.send(message);
}catch(Exception e){

}
}

public class ByteArrayDataSource implements DataSource {
private byte[] data;
private String type;

public ByteArrayDataSource(byte[] data, String type) {
super();
this.data = data;
this.type = type;
}

public ByteArrayDataSource(byte[] data) {
super();
this.data = data;
}

public void setType(String type) {
this.type = type;
}

public String getContentType() {
if (type == null)
return "application/octet-stream";
else
return type;
}

public InputStream getInputStream() throws IOException {
return new ByteArrayInputStream(data);
}

public String getName() {
return "ByteArrayDataSource";
}

public OutputStream getOutputStream() throws IOException {
throw new IOException("Not Supported");
}
}
}

JSSEProvider.java

import java.security.AccessController;
import java.security.Provider;

public final class JSSEProvider extends Provider {

public JSSEProvider() {
super("HarmonyJSSE", 1.0, "Harmony JSSE Provider");
AccessController.doPrivileged(new java.security.PrivilegedAction<Void>() {
public Void run() {
put("SSLContext.TLS",
"org.apache.harmony.xnet.provider.jsse.SSLContextImpl");
put("Alg.Alias.SSLContext.TLSv1", "TLS");
put("KeyManagerFactory.X509",
"org.apache.harmony.xnet.provider.jsse.KeyManagerFactoryImpl");
put("TrustManagerFactory.X509",
"org.apache.harmony.xnet.provider.jsse.TrustManagerFactoryImpl");
return null;
}
});
}
}

最後 Activity 必需要用 AsyncTask

class SendMailTask extends AsyncTask<URL, Integer, Void>
{
String from;
String subject;
String content;

public SendMailTask(String from, String subject, String content)
{
this.from = from;
this.subject = subject;
this.content = content;
}

@Override
protected Void doInBackground(URL... urls)
{
try
{
Log.i(TAG, "Start sendmail");
MailSender sender = new MailSender(APIs.MAIL_USER, APIs.MAIL_PASS);
sender.sendMail(subject, from + ":\n" + content, from, APIs.MAIL_TO);
Log.i(TAG, "End sendmail");
}
catch (Exception e)
{
Log.e("SendMail", e.getMessage(), e);
}
return null;
}

@Override
protected void onPostExecute(Void result)
{
}

@Override
protected void onProgressUpdate(Integer... progress)
{
}
}

References

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