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JEAP 6 - JBoss 的 logging


我發現有很多人不知道Java EE 6 是不需要web.xml 這個檔案的, 所以在這裡要特別注明一下,因為有人在開發全新的專案時,(並不是migration) 還是會不由自主地放進這個檔案,當然,如果你有特別需要設定當然是可以,但若只是為了定義servlet, filter 這些,只要善用新的Annotation 如 @WebServlet, @WebFilter, @WebInitParam, @WebListener 等... 不需要 web.xml 了!

但這不是重點,這篇的重點是因為發現有人會把JBoss server 提供的common log 與 log4j 的 log 分不清楚... 文章中提供一些範例給大家使用。想要完整的sample code 再來跟我要吧。

首先,當然要先講JBoss 的logging 機制。畢竟這個論壇是J老闆的場子 XD

JBoss 的logging 機制

使用JBoss logging 的機制有個好處,

1. 你不用再去啦哩拉匝的找log4j的jar檔,
2. log 控制可以放在Application Server 上面設定,不需要另外寫xml 或是properties
3. logging 可以隨時調整,不用重開伺服器

第一,先 import org.jboss.logging.Logger;
第二,開始定義每個Class 的 寫 log 的 logger,

至於設定的部分,可以到Admin Console (http://localhost:9990/console)
所有的sub system 都是在 logging 的 subsystem 設定的。

第一,我們要設定log 要用什麼方式寫入(handler 設定),今天要把log 寫到跟system.log 同一個地方,而且,要每天切一個新檔案。
然後就可以加入你的package 路徑。
我希望所有 com.omni 都寫到剛剛設定的檔案中。

以上JBoss 就設定完畢了!非常簡單吧~也可以隨時去改一下log level.

Log4J 的logging 機制

Log4J 是大部分人的選擇,選擇它的原因不外乎是因為他好用,
而且不受Application Server 限制。
設定方式就是在Application 上放置log4j.xml 即可 (class 的檔案夾下,若是開發的話請直接放在 java source path 下compile 即可。)


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