Web.xml Learning (7) _mime-mapping, Welcome-file-list, Error-page

10.mime-mapping:mime-mapping contains two child elements extension and Mime-type. Defines an extension and a MIME type to do the mapping.

MIME (Multipurpose Internet Mail Extensions) Multipurpose Internet Mail Extension type is the type of way in which files with an extension are set to open in one application.

When the extension file is accessed, the browser automatically opens with the specified application. Used to specify some client-defined file names and how some media files are opened

After the browser receives the file, it goes to the plugin system to find out which plug-ins can recognize the files that are received by the read.

If the browser does not know which plug-in system to call, it may tell the user that a plugin is missing, or that an existing plug-in may be selected directly to attempt to read the received file, which could cause the system to crash.

The lack of a MIME identity in the transmitted information can be difficult to estimate because some computer systems may not fail, but some computers may crash as a result.

<!--mime-mapping contains two child elements extension and Mime-type. Defines an extension and a MIME type to do the mapping.  -->   
    <mime-mapping>   
        <!--extended name  -->   
        <extension>htm</extension>   
        < !--MIME format  -->   
        <mime-type>text/html</mime-type>   
    </mime-mapping>

11.welcom-file-list: Instructs the server to use which file when it receives a URL that references a directory name instead of a filename.

<welcome-file-list>

Welcome-file-list contains a child element welcome-file. Used to define the first list.

<welcome-file> to specify the first page file name </welcome-flie>

Welcome-file is used to specify the first page file name. We can use <welcome-file> to specify a few home pages, and the server will be in accordance with the order to find the home page.

Example:

<welcome-file-list>  
  <welcome-file>index.jsp</welcome-file>  
  <welcome-file> Index.htm</welcome-file>  
</welcome-file-list>

12.error-page: Enables the page to be displayed when a particular HTTP status code is returned, or when a particular type of exception is thrown.

The Error-page element contains three child elements error-code,exception-type and location. Corresponds to the type of error code or exception (exception)

To the Web platform resource path.

<error-code> Error code </error-code>

HTTP Error Code, for example: 404

<exception-type>Exception</exception-type>

A Java exception type with a full name

<location>/Path </location>

Related resource paths within a web platform

</error-page>

Example:

<error-page>  
   <error-code>404</error-code>  
   <location>/error404.jsp</location >  
</error-page>  
<error-page>  
   <exception-type>java.lang.exception</ exception-type>  
   <location>/except.jsp</location>  
</error-page>

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