J2EE、WEBGIS項目開發 Tapestry、Prado、Zend框架學習

Tomcat啟動時classloader加載順序
  Tomcat的class加載的優先順序一覽  
  1.最先是$JAVA_HOME/jre/lib/ext/下的jar文件。  
  2.環境變量CLASSPATH中的jar和class文件。  
  3.$CATALINA_HOME/common/classes下的class文件。  
  4.$CATALINA_HOME/commons/endorsed下的jar文件。  
  5.$CATALINA_HOME/commons/i18n下的jar文件。  
  6.$CATALINA_HOME/common/lib   下的jar文件。  
  （JDBC驅動之類的jar文件可以放在這里，這樣就可以避免在server.xml配置好數據源卻出現找不到JDBC   Driver的情況。）  
  7.$CATALINA_HOME/server/classes下的class文件。  
  8.$CATALINA_HOME/server/lib/下的jar文件。  
  9.$CATALINA_BASE/shared/classes   下的class文件。  
  10.$CATALINA_BASE/shared/lib下的jar文件。  
  11.各自具體的webapp   /WEB-INF/classes下的class文件。  
  12.各自具體的webapp   /WEB-INF/lib下的jar文件。

What this means is that leadership involves setting direction, communicating that vision passionately to those they work with, and helping the people they lead understand and commit to that vision. Managers, on the other hand, are responsible for ensuring that the vision is implemented efficiently and successfully.

but what if my form field name is array

<input type=text name="n1[]" id="n1[]" value='12345">   <input type=text name="n1[]" id="n1[]" value="14454">  

how to send these 2 field value send to url by jquery post method?

You can pass in an array as a value in the object:

{name: 'John', 'nl[]': ['12345', '14454']}  

(This is documented at ajax but also works for post.)

var fields = $(":input").serializeArray();      $.post("test.php",fields);

from:http://stackoverflow.com/questions/1656267/how-to-send-multi-field-value-by-jquery-post

string.replace(new RegExp(oldString,"gm"),newString))

在網上看到解決方案是把注冊表里（因為是windows操作系統）\HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE 下的NLS_lang 的NA值修改為SIMPLIFIED CHINESE_CHINA.ZHS16GBK；
 但是我在操作的時候，只把Oracle目錄下所有能找到的NLS_Lang值修改了，偏偏沒有修改Oracle目錄所對應的NLS_Lang值，導致一直測試不通過，始終報錯，最后終于發現原來Oracle目錄本身對應的NLS_lang值沒有修改，修改過后，測試通過，成功！

If you got this message: "Warning: Cannot modify header information - headers already sent by ...."
如果在執行php程序時看到這條警告:"Warning: Cannot modify header information - headers already sent by ...."

Few notes based on the following user posts:
有以下幾種解決方法:

1. Blank lines (空白行):
Make sure no blank line after <?php ... ?> of the calling php script.
檢查有<?php ... ?> 后面沒有空白行，特別是include或者require的文件。不少問題是這些空白行導致的。

2. Use exit statement (用exit來解決):
Use exit after header statement seems to help some people
在header后加上exit();
header ("Location: xxx");
exit();

3. PHP has this annoying problem, if your HTML goes before any PHP code or any header modification before redirecting to certain page, it'll said "Warning: Cannot modify header information - headers already sent by ...." Basically anytime you output to browser, the header is set and cannot be modified.   So two ways to get around the problem:

3a. Use Javascript (用Javascript來解決):
<? echo "<script> self.location(\"file.php\");</script>"; ?>
Since it's a script, it won't modify the header until execution of Javascript.
可以用Javascript來代替header。但是上面的這段代碼我沒有執行成功... 另外需要注意，采用這種方法需要瀏覽器支持Javascript.

3b. Use output buffering (用輸出緩存來解決):
<?php ob_start(); ?>
... HTML codes ...
<?php
... PHP codes ...
header ("Location: ....");
ob_end_flush();
?>
This will save the output buffer on server and not output to browser yet, which means you can modify the header all you want until the ob_end_flush() statement.   This method is cleaner than the Javascript since Javascript method assumes the browser has Javascript turn on.   However, there are overhead to store output buffer on server before output, but with modern hardware I would imagine it won't be that big of deal.   Javascript solution would be better if you know for sure your user has Javascript turn on on their browser.

就像上面的代碼那樣，這種方法在生成頁面的時候緩存，這樣就允許在輸出head之后再輸出header了。


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結果最后還是這個問題：
原來是php.ini里面的配置出了問題，output_buffering參數默認為off的，現在將它設為”on”就ＯＫ了。