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WAR (file format)
In software engineering, a WAR file (or Web application ARchive) is a JAR file used to distribute a collection of JavaServer Pages, Java Servlets, Java classes, XML files, tag libraries, static web pages (HTML and related files) and other resources that together constitute a web application.
==Content and structure==
A WAR file may be digitally signed in the same way as a JAR file in order to allow others to determine what source the code came from.
There are special files and directories within a WAR file:
* The /WEB-INF directory in the WAR file contains a file named web.xml which defines the structure of the web application. If the web application is only serving JSP files, the web.xml file is not strictly necessary. If the web application uses servlets, then the servlet container uses web.xml to ascertain to which servlet a URL request will be routed. web.xml is also used to define context variables which can be referenced within the servlets and it is used to define environmental dependencies which the deployer is expected to set up. An example of this is a dependency on a mail session used to send email. The servlet container is responsible for providing this service.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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