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本文介紹了IMAP請(qǐng)求之間的結(jié)果不同的處理方法，對(duì)大家解決問(wèn)題具有一定的參考價(jià)值，需要的朋友們下面隨著小編來(lái)一起學(xué)習(xí)吧！

問(wèn)題描述

我和我的團(tuán)隊(duì)在我們的應(yīng)用程序中編寫(xiě)了一個(gè)供其他團(tuán)隊(duì)使用的郵件組件。此組件旨在允許他們使用自定義搜索條件下載電子郵件。目前正在使用的是使用IMAP protocol在Gmail帳戶(hù)的一系列日期之間進(jìn)行郵件搜索。在2016年4月4日格林尼治標(biāo)準(zhǔn)時(shí)間6：00AM+1之前，它一直運(yùn)行正常，只下載范圍內(nèi)的電子郵件。然而，從格林尼治標(biāo)準(zhǔn)時(shí)間8：00AM+1開(kāi)始，服務(wù)器的響應(yīng)突然發(fā)生變化，它開(kāi)始返回整個(gè)收件箱文件夾！

重復(fù)最初的測(cè)試，我們發(fā)現(xiàn)我們收到的是整個(gè)收件箱文件夾，而不是范圍內(nèi)的文件夾。在對(duì)IMAP請(qǐng)求進(jìn)行了一些深入研究后，Gmail似乎在某些情況下更改了返回的電子郵件數(shù)量：

當(dāng)&quot；開(kāi)始日期&SearchTerm有ComparisonTerm.GT項(xiàng)時(shí)，或
當(dāng)&quot；結(jié)束日期SearchTerm有一個(gè)ComparisonTerm.LE期限時(shí)

在這兩種情況下，Gmail的IMAP服務(wù)器都會(huì)返回文件夾中的所有電子郵件。相反，作為一個(gè)例子，雅虎的IMAP服務(wù)器只返回那些符合給定條件的電子郵件。

我們給他們開(kāi)了一張票，問(wèn)他們的回應(yīng)有沒(méi)有變化，他們回答說(shuō)什么都沒(méi)有變化。當(dāng)然，沒(méi)有辦法證明這一點(diǎn)(我們?nèi)匀粵](méi)有時(shí)光機(jī))。

由于我們對(duì)此意外行為產(chǎn)生了很大影響，我們決定進(jìn)一步調(diào)查，并創(chuàng)建了一個(gè)簡(jiǎn)單的郵件客戶(hù)端，以使用不同的條件組合從不同的IMAP服務(wù)器下載郵件。

從this link’s程序開(kāi)始，我們添加了與其他人核對(duì)的功能，但更改庫(kù)以滿(mǎn)足我們的javax.mail版本1.5.5。因此，我們避免了不同的實(shí)現(xiàn)行為。

代碼附在下面：

package gmail;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;

import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.search.AndTerm;
import javax.mail.search.ComparisonTerm;
import javax.mail.search.ReceivedDateTerm;
import javax.mail.search.SearchTerm;

public class JavaMailTest {
    
    public static void main(String[] args) {
        
        JavaMailTest testClient=new JavaMailTest();
        
        //Yahoo
        //SEARCH SINCE 3-Apr-2016 BEFORE 7-Apr-2016 ALL
        testClient.performTest(testClient.getYahooImapProps(),ComparisonTerm.GE,ComparisonTerm.LT);
        //Gmail
        //SEARCH SINCE 3-Apr-2016 BEFORE 7-Apr-2016 ALL
        testClient.performTest(testClient.getGmailImapProps(),ComparisonTerm.GE,ComparisonTerm.LT);
        //Yahoo
        //SEARCH SINCE 3-Apr-2016 OR BEFORE 7-Apr-2016 ON 7-Apr-2016 ALL
        testClient.performTest(testClient.getYahooImapProps(),ComparisonTerm.GE,ComparisonTerm.LE);
        //Gmail
        //SEARCH SINCE 3-Apr-2016 OR BEFORE 7-Apr-2016 ON 7-Apr-2016 ALL
        testClient.performTest(testClient.getGmailImapProps(),ComparisonTerm.GE,ComparisonTerm.LE);
        //Yahoo
        //SEARCH NOT ON 3-Apr-2016 SINCE 3-Apr-2016 BEFORE 7-Apr-2016 ALL
        testClient.performTest(testClient.getYahooImapProps(),ComparisonTerm.GT,ComparisonTerm.LT);
        //Gmail
        //SEARCH NOT ON 3-Apr-2016 SINCE 3-Apr-2016 BEFORE 7-Apr-2016 ALL
        testClient.performTest(testClient.getGmailImapProps(),ComparisonTerm.GT,ComparisonTerm.LT);
        //Yahoo
        //SEARCH NOT ON 3-Apr-2016 SINCE 3-Apr-2016 OR BEFORE 7-Apr-2016 ON 7-Apr-2016 ALL
        testClient.performTest(testClient.getYahooImapProps(),ComparisonTerm.GT,ComparisonTerm.LE);
        //Gmail
        //SEARCH NOT ON 3-Apr-2016 SINCE 3-Apr-2016 OR BEFORE 7-Apr-2016 ON 7-Apr-2016 ALL
        testClient.performTest(testClient.getGmailImapProps(),ComparisonTerm.GT,ComparisonTerm.LE);

    }

    public int performTest(Properties props, int startTermCondition, int endTermCondition)
    {
        try {
            Session session = Session.getDefaultInstance(props, null);
            Message[] totalMessages = null;

            Store store = session.getStore(props.getProperty("protocol"));
            store.connect(props.getProperty("mail.imap.host"), props.getProperty("account"), props.getProperty("pass"));
            Folder inbox = store.getFolder("inbox");
            inbox.open(Folder.READ_ONLY);


            SimpleDateFormat ft = new SimpleDateFormat ("yyyy-MM-dd"); 
            Date startDate = ft.parse("2016-04-03");
            Date endDate = ft.parse("2016-04-07");

            System.out.println("Testing email account: <"+props.getProperty("account")+"> with startDate: <" + startDate + "> (ComparisonTerm."+
                    getConditionText(startTermCondition)+") and endDate: <" + endDate+"> (ComparisonTerm."+getConditionText(endTermCondition)+")");

            Message[] messages = inbox.getMessages();

            if (messages != null && messages.length > 0) {
                SearchTerm startDateTearm = 
                        new ReceivedDateTerm(startTermCondition, startDate);

                SearchTerm endDateTerm = 
                        new ReceivedDateTerm(endTermCondition, endDate);

                SearchTerm andTerm = new AndTerm(startDateTearm, endDateTerm); 

                totalMessages = inbox.search(andTerm);
                if(totalMessages.length > 0){
                    System.out.println("Found "+totalMessages.length+" matching messages (Total messages in folder: "+messages.length+")");
                }

                /*for (int i = 0; i < totalMessages.length; i++) {
                    System.out.println(totalMessages[i].getReceivedDate() + " --> Mail Subject:- " + totalMessages[i].getSubject());

                }*/
                //First message
                int currentMessage=0;
                System.out.println("First Message: "+totalMessages[currentMessage].getReceivedDate() + " --> Mail Subject: " + totalMessages[currentMessage].getSubject().substring(0, 5));
                //Last message
                currentMessage=totalMessages.length-1;
                System.out.println("Last Message:  "+totalMessages[currentMessage].getReceivedDate() + " --> Mail Subject: " + totalMessages[currentMessage].getSubject().substring(0, 5));
            }


            inbox.close(true);
            store.close();
            return totalMessages.length;

        } catch (Exception e) {
            e.printStackTrace();
            return -1;
        }

    }
    
    public static String getConditionText(int condition)
    {
        String returnValue="";
        switch (condition) {
        case ComparisonTerm.EQ:
            returnValue="EQ";
            break;
        case ComparisonTerm.GE:
            returnValue="GE";
            break;
        case ComparisonTerm.GT:
            returnValue="GT";
            break;
        case ComparisonTerm.LE:
            returnValue="LE";
            break;
        case ComparisonTerm.LT:
            returnValue="LT";
            break;
        case ComparisonTerm.NE:
            returnValue="NE";
            break;
        default:
            returnValue="Error";
            break;
        }
        return returnValue;
    }
    
    public Properties getYahooImapProps()
    {
        Properties props = new Properties();
        //Yahoo
        String imapServer="imap.mail.yahoo.com";
        String imapPort="993";
        String account="********@yahoo.es";
        String pass="*********";
        
        props.setProperty("mail.imap.host", imapServer);
        props.setProperty("mail.imap.port", imapPort);
        props.setProperty("mail.imap.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        props.setProperty("mail.imap.auth", "true");
        props.setProperty("account", account);
        props.setProperty("pass", pass);
        props.setProperty("protocol", "imaps");
        
        return props;
        
    }

    public Properties getGmailImapProps()
    {
        Properties props = new Properties();
        //Gmail
        String imapServer="imap.gmail.com";
        String imapPort="143";
        String account="******@gmail.com";
        String pass="********";
        
        props.setProperty("mail.imap.host", imapServer);
        props.setProperty("mail.imap.port", imapPort);
        /*props.setProperty("mail.imap.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        props.setProperty("mail.imap.auth", "true");*/
        props.setProperty("account", account);
        props.setProperty("pass", pass);
        props.setProperty("protocol", "imap");
        
        return props;
    }

}

為了使程序輸出更清楚，我在第一個(gè)方法輸出之前添加了請(qǐng)求：

  //SEARCH SINCE 3-Apr-2016 BEFORE 7-Apr-2016 ALL
  Testing email account: <*********@yahoo.es> with startDate: <Sun Apr 03 00:00:00 CEST 2016> (ComparisonTerm.GE) and endDate: <Thu Apr 07 00:00:00 CEST 2016> (ComparisonTerm.LT)
  Found 5 matching messages (Total messages in folder: 78)
  First Message: Mon Apr 04 23:14:22 CEST 2016 --> Mail Subject: Aviso
  Last Message:  Tue Apr 05 00:48:00 CEST 2016 --> Mail Subject: Alter
  //SEARCH SINCE 3-Apr-2016 BEFORE 7-Apr-2016 ALL
  Testing email account: <*********@gmail.com> with startDate: <Sun Apr 03 00:00:00 CEST 2016> (ComparisonTerm.GE) and endDate: <Thu Apr 07 00:00:00 CEST 2016> (ComparisonTerm.LT)
  Found 92 matching messages (Total messages in folder: 20138)
  First Message: Sun Apr 03 04:08:47 CEST 2016 --> Mail Subject: Tu es
  Last Message:  Wed Apr 06 22:12:45 CEST 2016 --> Mail Subject: ?Quie
  //SEARCH SINCE 3-Apr-2016 OR BEFORE 7-Apr-2016 ON 7-Apr-2016 ALL
  Testing email account: <*********@yahoo.es> with startDate: <Sun Apr 03 00:00:00 CEST 2016> (ComparisonTerm.GE) and endDate: <Thu Apr 07 00:00:00 CEST 2016> (ComparisonTerm.LE)
  Found 5 matching messages (Total messages in folder: 78)
  First Message: Mon Apr 04 23:14:22 CEST 2016 --> Mail Subject: Aviso
  Last Message:  Tue Apr 05 00:48:00 CEST 2016 --> Mail Subject: Alter
  //SEARCH SINCE 3-Apr-2016 OR BEFORE 7-Apr-2016 ON 7-Apr-2016 ALL
  Testing email account: <*********@gmail.com> with startDate: <Sun Apr 03 00:00:00 CEST 2016> (ComparisonTerm.GE) and endDate: <Thu Apr 07 00:00:00 CEST 2016> (ComparisonTerm.LE)
  Found 20138 matching messages (Total messages in folder: 20138)
  First Message: Sat Sep 04 13:23:35 CEST 2004 --> Mail Subject: Gmail
  Last Message:  Tue Apr 19 10:09:06 CEST 2016 --> Mail Subject: El re
  //SEARCH NOT ON 3-Apr-2016 SINCE 3-Apr-2016 BEFORE 7-Apr-2016 ALL
  Testing email account: <*********@yahoo.es> with startDate: <Sun Apr 03 00:00:00 CEST 2016> (ComparisonTerm.GT) and endDate: <Thu Apr 07 00:00:00 CEST 2016> (ComparisonTerm.LT)
  Found 5 matching messages (Total messages in folder: 78)
  First Message: Mon Apr 04 23:14:22 CEST 2016 --> Mail Subject: Aviso
  Last Message:  Tue Apr 05 00:48:00 CEST 2016 --> Mail Subject: Alter
  //SEARCH NOT ON 3-Apr-2016 SINCE 3-Apr-2016 BEFORE 7-Apr-2016 ALL
  Testing email account: <*********@gmail.com> with startDate: <Sun Apr 03 00:00:00 CEST 2016> (ComparisonTerm.GT) and endDate: <Thu Apr 07 00:00:00 CEST 2016> (ComparisonTerm.LT)
  Found 20138 matching messages (Total messages in folder: 20138)
  First Message: Sat Sep 04 13:23:35 CEST 2004 --> Mail Subject: Gmail
  Last Message:  Tue Apr 19 10:09:06 CEST 2016 --> Mail Subject: El re
  //SEARCH NOT ON 3-Apr-2016 SINCE 3-Apr-2016 OR BEFORE 7-Apr-2016 ON 7-Apr-2016 ALL
  Testing email account: <*********@yahoo.es> with startDate: <Sun Apr 03 00:00:00 CEST 2016> (ComparisonTerm.GT) and endDate: <Thu Apr 07 00:00:00 CEST 2016> (ComparisonTerm.LE)
  Found 5 matching messages (Total messages in folder: 78)
  First Message: Mon Apr 04 23:14:22 CEST 2016 --> Mail Subject: Aviso
  Last Message:  Tue Apr 05 00:48:00 CEST 2016 --> Mail Subject: Alter
  //SEARCH NOT ON 3-Apr-2016 SINCE 3-Apr-2016 OR BEFORE 7-Apr-2016 ON 7-Apr-2016 ALL
  Testing email account: <*********@gmail.com> with startDate: <Sun Apr 03 00:00:00 CEST 2016> (ComparisonTerm.GT) and endDate: <Thu Apr 07 00:00:00 CEST 2016> (ComparisonTerm.LE)
  Found 20138 matching messages (Total messages in folder: 20138)
  First Message: Sat Sep 04 13:23:35 CEST 2004 --> Mail Subject: Gmail
  Last Message:  Tue Apr 19 10:09:06 CEST 2016 --> Mail Subject: El re

根據(jù)該結(jié)果，我們可以得出以下結(jié)論：

考慮到給定的Java條件，Yahoo會(huì)返回適當(dāng)數(shù)量的電子郵件。
Javamail的請(qǐng)求可能過(guò)于含糊。
@Gmail：考慮到某些請(qǐng)求中的一堆條件…為什么您剛剛決定退還整個(gè)文件夾？
為什么同一請(qǐng)求會(huì)有不同的響應(yīng)？
誰(shuí)正確退回了郵件？
協(xié)議的設(shè)計(jì)難道不是為了使事情標(biāo)準(zhǔn)化，而不是讓事情變得更糟嗎？

我們也嘗試使用Outlook帳戶(hù)，結(jié)果與Gmail相同。

推薦答案

在我看來(lái)，這肯定是Gmail中的一個(gè)錯(cuò)誤。我能夠自己復(fù)制它。如果Outlook.com也有同樣的漏洞，我真的很驚訝。

為什么您認(rèn)為該請(qǐng)求含糊不清？IMAP規(guī)范非常明確。

幾點(diǎn)注意事項(xiàng)…

是否確實(shí)要使用Java Mail 1.5.5？您顯示的搜索命令反映了1.5.3之前版本的JavaMail bug。
您應(yīng)該change Session.getDefaultInstance to Session.getInstance。
您don’t need the socket factory properties；只需將”mail.imap.ssl”設(shè)置為”true”即可。

這篇關(guān)于IMAP請(qǐng)求之間的結(jié)果不同的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，