javax mail發件人時區中的getReceivedDate

Question

我想在電子郵件發件人的時區中獲取收到的日期。使用javax郵件可能嗎？ message.getReceivedDate()在我服務器的時區中返回日期。

Answer 1

據我所知，至少在Java 7中，Date類擁有（由它自己）沒有原始時區的概念。因此，如果您想訪問郵件的原始時區，則應直接獲取Date標題：message.getHeader("Date")。

根據RFC2822，這個頭必須總是存在，必須包含一個時區，並應在當地時間表示。所以你必須解析該值並提取發件人時區。接下來，您只需將getReceivedDate轉換爲該時區即可。從RFC2822

提取物（日期標題的解析）：

orig-date  =  "Date:" date-time CRLF 
date-time  =  [ day-of-week "," ] date FWS time [CFWS] 
day-of-week  =  ([FWS] day-name)/obs-day-of-week 
day-name  =  "Mon"/"Tue"/"Wed"/"Thu"/
         "Fri"/"Sat"/"Sun" 
date   =  day month year 
year   =  4*DIGIT/obs-year 
month   =  (FWS month-name FWS)/obs-month 
month-name  =  "Jan"/"Feb"/"Mar"/"Apr"/
         "May"/"Jun"/"Jul"/"Aug"/
         "Sep"/"Oct"/"Nov"/"Dec" 
day    =  ([FWS] 1*2DIGIT)/obs-day 
time   =  time-of-day FWS zone 
time-of-day  =  hour ":" minute [ ":" second ] 
hour   =  2DIGIT/obs-hour 
minute   =  2DIGIT/obs-minute 
second   =  2DIGIT/obs-second 
zone   =  (("+"/"-") 4DIGIT)/obs-zone