javamail：即使mail.imap.ssl.enable = false和port = 143，爲什麼IMAPStore.connect切換到端口993？

Question

在下面的代碼（IBM Domino 9.0.1 Java代理）中，我試圖通過端口143將SSL連接到IMAP存儲。

package com.fm; 
import javax.mail.internet.*; 
import javax.mail.*; 
import java.net.ConnectException; 
import java.util.*; 
public class JSaveImap { 
    private Store store=null; 
    private String host; 
    private String port; 
    private String user; 
    private String password; 
    private javax.mail.Session mailSession=null; 
    private boolean doDebug; 

    public JSaveImap() { 
     System.out.println("Creato oggetto"); 
    } 

    public void saveMessage(MimeMessage message, String folderName) throws MessagingException 
    { 
     //http://stackoverflow.com/questions/11524716/save-draft-message-using-java-mail-api 

     Folder folder=null; 
     if (folderName.length()>0) { 
      folder= store.getFolder(folderName); 
     } else { 
      folder= store.getFolder("inbox"); 
     }  
     if (doDebug) {System.out.println("Folder aperto:" + folder.getFullName());} 
     folder.open(Folder.READ_WRITE); 
     //draftMessage.setFlag(Flag.DRAFT, true); 
     MimeMessage arrMessage[] = {message}; 
     folder.appendMessages(arrMessage); 
     folder.close(false); 
     folder=null; 
    } 

    public boolean connect(String pHost, String pPort, String pUser, String pPassword,boolean doDebug) { 
     boolean retVal=false; 
     this.doDebug=doDebug; 
     if (doDebug) {System.out.println(this.getClass().getName()+ ".connect");} 
     if (!(pHost.equalsIgnoreCase(host) && pPort.equalsIgnoreCase(port) && pUser.equalsIgnoreCase(user) && pPassword.equalsIgnoreCase(password))) { 
      // parametri differenti, resetta connessione precedente 
      recycle(); 
      host=pHost; 
      port=pPort; 
      user=pUser; 
      password=pPassword; 
     } 
     System.out.println("Host: " + host + ", port: " + port + ", user: " + user + ", password: " + password); 
     try { 
      System.out.println(this.getClass().getName() + " connettiamo?"); 
      //Properties props = System.getProperties();   
      Properties props =new Properties();   //Nuove proprietà per non avere conflitti con quelle gia in uso ad altri account IMAP 
      props.setProperty("mail.store.protocol", "imap"); 
      if (port.length()>0) { 
       props.setProperty("mail.imap.port", port); 
      } 
      props.setProperty("mail.imap.ssl.enable", "false");   //credo che non serva, oltretutto default =false, poi dovrebbe venire parametrico dall'account 
      props.setProperty("mail.imap.connectiontimeout", "5000"); 
      props.setProperty("mail.imap.timeout", "5000"); 
      mailSession = Session.getDefaultInstance(props, null); 

      if (doDebug) { 
       System.out.println("Proprietà correnti ************************************************************"); 
       Enumeration keys = props.keys(); 
       while (keys.hasMoreElements()) { 
        String key = (String)keys.nextElement(); 
        String value = (String)props.get(key); 
        System.out.println(key + ": " + value); 
       } 
      } 

      if (doDebug) { mailSession.setDebug(true); } 
      store = mailSession.getStore("imap"); 
      //store=mailSession.getStore(new URLName("imap",host,Integer.parseInt(port),null,user,password)); 
      //store.connect(host, user, password); 
      store.connect(host, Integer.parseInt(port), user, password); 
      System.out.println("connesso allo store "+ host + " for " +user); 
      retVal=true; 
     } catch(NoSuchProviderException ne) { 
      System.out.println("Exception in class " + ne.getStackTrace()[0].getClassName() + 
        " method: "+ ne.getStackTrace()[0].getMethodName()+ 
        ", row: " + ne.getStackTrace()[0].getLineNumber() + ": " + ne.toString()); 

      //Questa eccezione non la gestisco perchè è nel caso in cui il provider non supporti 
      // il protocollo. Lo escludo per ora    
      ne.printStackTrace(); 
      //throw new MessagingException("Errore nella connessione al provider"); 
     } catch (MessagingException ne) { 
      //throw new MessagingException ("MessagingException durante connessione:"+e.getMessage(),e); 
      System.out.println("Exception in class " + ne.getStackTrace()[0].getClassName() + 
        " method: "+ ne.getStackTrace()[0].getMethodName()+ 
        ", row: " + ne.getStackTrace()[0].getLineNumber() + ": " + ne.toString()); 
      ne.printStackTrace(); 

     } catch (Exception ne) { 
      System.out.println("Exception in class " + ne.getStackTrace()[0].getClassName() + 
        " method: "+ ne.getStackTrace()[0].getMethodName()+ 
        ", row: " + ne.getStackTrace()[0].getLineNumber() + ": " + ne.toString()); 
      ne.printStackTrace(); 
     } 
     if (doDebug) System.out.println("Connect terminata"); 

     return retVal; 
    } 

    public void recycle() { 
     try { 
      host=""; 
      port=""; 
      user=""; 
      password=""; 
      //if (folder.isOpen()) { folder.close(true);} 
      if (store!=null) { 
       if (store.isConnected()) {store.close();} 
      } 

     } catch (Exception ne) { 
      System.out.println("Exception in class " + ne.getStackTrace()[0].getClassName() + 
        " method: "+ ne.getStackTrace()[0].getMethodName()+ 
        ", row: " + ne.getStackTrace()[0].getLineNumber() + ": " + ne.toString()); 
     } 

    } 

} 

爲什麼我收到了993端口以外，與消息

無法連接到主機，端口：172.17.0.247，993;

輸出：

Proprietà correnti ************************************************************ 
mail.imap.port: 143 
mail.imap.ssl.enable: false 
mail.imap.timeout: 5000 
mail.imap.connectiontimeout: 5000 
mail.store.protocol: imap 
DEBUG: setDebug: JavaMail version 1.5.4 
DEBUG: getProvider() returning javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Oracle] 
DEBUG IMAP: mail.imap.fetchsize: 16384 
DEBUG IMAP: mail.imap.ignorebodystructuresize: false 
DEBUG IMAP: mail.imap.statuscachetimeout: 1000 
DEBUG IMAP: mail.imap.appendbuffersize: -1 
DEBUG IMAP: mail.imap.minidletime: 10 
DEBUG IMAP: closeFoldersOnStoreFailure 
**DEBUG IMAP: trying to connect to host "172.17.0.247", port 143, ** 
isSSL false 
Exception in class com.sun.mail.imap.IMAPStore method: protocolConnect, row: 731: com.sun.mail.util.MailConnectException: Couldn't connect to host, 
**port: 172.17.0.247, 993; timeout 5000;** 
nested exception is: java.net.ConnectException: Connection refused: connect 
Agent Manager: Agent error: com.sun.mail.util.MailConnectException: Couldn't connect to host, port: 172.17.0.247, 993; timeout 5000; nested exception is: java.net.ConnectException: Connection refused: connect 
Agent Manager: Agent error: at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:731) 
Agent Manager: Agent error: at javax.mail.Service.connect(Service.java:364) 
Agent Manager: Agent error: at com.fm.JSaveImap.connect(JSaveImap.java:86) 

Answer 1

這是一個getDefaultInstance行爲，由於以前的IMAP連接

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