Configuration of servlet-mapping URL-pattern in Web. xml

Servlet-mapping provides a URL for the servlet class. You can access your servlet in the address bar, for example:

<Servlet>

<Servlet-Name> helloworld </servlet-Name>

<Servlet-class> com. HX. webfrom. helloworld <servlet-class>

</Servlet>

<Servlet-mapping>

<Servlet-Name> helloworld </servlet-Name>

<Servlet-class>/Hello <servlet-class>

</Servlet-mapping>

Enter http: // localhost: 8080/hello in the address bar.

Tomcat finds mapping in Web. xml by/index. jsp and finds the name:

<Servlet-mapping>

<Servlet-Name> org. Apache. jsp. index_jsp </servlet-Name>

<URL-pattern>/index. jsp </url-pattern>

</Servlet-mapping>



Search for classes by name:

<Servlet>

<Servlet-Name> org. Apache. jsp. index_jsp </servlet-Name>

<Servlet-class> org. Apache. jsp. index_jsp </servlet-class>

</Servlet>



Find Org. apache. JSP. after index_jsp generates an object, it initializes the generated request, response and other objects as parameters/INIT (), and CALLS methods (doget (), dopost ()).

(Many details such as cache and pool are not taken into account, but they do not affect understanding)

When configuring servlet-mapping for Web. XML

Conclusion:

• '/XXX /*'

• '*. Html'

•'/'

• All others are precise ing. For example, '/XXX/y *. html' can only map URL requests of/XXX/y *. html.

For example, '/XXX' can only map/xxx URL requests.

Reference

10.2 specification of Mappings

In the web application deployment descriptor, the following syntax is used to define mappings:

• A string beginning with a'/'character and ending with a'/* 'Postfix is used as a path

Mapping.

• A string beginning with a '*.' prefix is used as an extension mapping.

• All other strings are used as exact matches only

• A string containing only the '/' character indicates that servlet specified by the mapping becomes the "default" servlet of the application.

Translation:

10.2 ing Rule Description

In the Web Application Deployment description (Web. XML), the following syntax structure is used to define the ing:

• A string starting with '/' and ending with '/*' is used for path ing.

• Start with '*.' For extension ing.

• All other strings only perform exact ing.

• A string containing only '/' makes the current servlet the default servlet of the application.