Use the manifest file to specify that a JAR file can reference another JAR file.
Standalone EJBs cannot use the Manifest Class-Path. It is only supported for
components that are deployed within an EAR file. The clients should reference
the client.jar in the classpath entry of the manifest file.
2. DOCTYPE: 告訴server servlet的版本(是2.2或是2.3)<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" http://java.sun.com/dtd/web-app_2_3.dtd>>3. Root: 必定為<web-app> 且一定為小寫. 如:
<web-app>4. Elements: 順序必定為以下順序:
<!-- Other elements go here. All are optional. -->
</web-app>
詳細內容可以參考dtd的定義, 下面指列出一些我常用的elements以及一些注意事項.
1. servlet: 常用servlet-name以及servlet-class這兩個subelements. servlet-name一定要先出現, 才能出現servlet-class. 它的影響有兩個a). initialization parameters, custom URL patterns, and other customizations refer to the servlet by the registered name, not by the class name. b). the name can be used in the URL instead of the class name. 也就是我可以用http://host/webAppPrefix/servlet/xxx代替http://host/webAppPrefix/servlet/package.yyyServlet來連結, 其中xxx是設定的servlet-name, package.yyyServlet是servlet的class. 另外, 若是此servlet為一個jsp檔案的時候, 請改用jsp-file這個tag去代替servlet-class, 因為我們無法得知jsp被編譯之後的class名稱為何. 而一個container當中可以有很多個servlet, 所以在web.xml當中也可以同時定義很多個servlet.
2. servlet-mapping: 用於客制化URL, 一般結構為:
<servlet-mapping> <servlet-name>name</servlet-name> <url-pattern>url</url-pattern> </servlet-mapping>其中name就是在servlet中所定義的servlet-name, 而url則為一個pattern,大致有下面幾種形式
3. 使用servlet的initialization parameters. 一般型態為類似於下面的格式:
<servlet>Initialization parameters are only available whenservlets are accessed by means of their registered names or throughcustom URL patterns associated with their registered names. Initialization parameters are not available in servlets that are accessedby their default URL. 而自己撰寫servlet的
<servlet-name>InitTest</servlet-name>
<servlet-class>myPackage.InitServlet</servlet-class>
<init-param>
<param-name>param1</param-name>
<param-value>Value 1</param-value>
</init-param>
</servlet>
init()時可以利用getServletConfig().getInitParameter("...") 來取得type為String的parameter. 4.context-param可以設定提供給整個system, 裡面包含的subelement為context-name以及context-value.
5.若要將servlet在system啟動時就load進來, 可以使用load-on-starup這個tag
6.Welcome page的設定是透過welcome-file-list這個element來達到, 而放置於當中的welcome-file是有順序可言的, 若是第一個找不到, 則會找第二個, 以此類推, 直到沒有則使用server所設定的.
7.
| In Spring | EJB |
| AbstractStatelessSessionBean | Stateless Session Bean |
| AbstractStatefulSessionBean | Stateful Session Bean |
| AbstractMessageDrivenBean | Message Driven Bean |
BeanFactoryReference userBeanFactory (String factoryKey) throws BeansException;ServiceInterface和EJBObjectEJBHomecreate()要return 3的typeonEjbCreate() throws CreateException這個function.
<env-entry>
<env-entry-name>ejb/BeanFactoryPath</env-entry-name>
<env-entry-type>java.lang.String</env-entry-type>
<env-entry-value>spring-config.xml</env-entry-value>
</env-entry>
