groovyとJavaMailでgmailのメールを受信する

groovyとJavaMailでgmailのメールを受信するには、以下のコードを実行します。

@Grab(group="javax.mail", module="mail", version="latest.integration")
import java.security.*
import java.util.*
import javax.mail.*
import javax.mail.search.*
import javax.mail.internet.*

popHost = "pop.gmail.com"
popPort = "995"
Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider())
Properties props = new Properties()
props.put("mail.pop3.host", popHost)
props.put("mail.pop3.port", popPort)
props.put("mail.pop3.socketFactory.port", popPort);
props.put("mail.pop3.socketFactory.class",
  "javax.net.ssl.SSLSocketFactory")
props.put("mail.pop3.socketFactory.fallback", "false")

Session session = Session.getDefaultInstance(props,
  [
    getPasswordAuthentication: {
      return new PasswordAuthentication("youraccount@gmail.com",
        'yourpassword')
    }
  ] as Authenticator
)
Store store = null
try
{
  store = session.getStore("pop3")
  store.connect()
  folder = store.getFolder("INBOX")
  folder.open(Folder.READ_ONLY)

  for( message in folder.getMessages() ){
    // 題名
    println("subject:" + message.getSubject())
    // 送信日付
    println("date:" + message.getSentDate())
    // from
    println("from:" + message.getFrom()[0].getAddress())
    println("content-type:" + message.getContentType())
    if( message.getContentType().startsWith("text/plain") ){
      // テキスト形式
      println("content:" + message.getContent())
    } else {
      if( message.getContent() instanceof Multipart){
        // Multipartの場合
        mp = message.getContent()
        for(int ip=0;ip<mp.getCount();ip++){
          println("content-type:" + mp.getBodyPart(ip).getContentType())
          disposition = mp.getBodyPart(ip).getDisposition()
          if( !disposition.equals(Part.ATTACHMENT) &&
            !disposition.equals(Part.INLINE) ){
            println("content:" + mp.getBodyPart(ip).getContent())
           }
         }
       }
    }
  }
  folder.close(false)
}
finally
{
  if( store != null )store.close()
}

動作環境
groovy 1.8.0, OpenJDK1.6.0_22