Configuration of Servlet-mapping Url-pattern in Web. XML __web

Servlet-mapping provides a URL for the servlet class to 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 to access the

Tomcat presses/index.jsp to find mapping in Web. XML, find name:   
  <servlet-mapping>   
  <servlet-name>org.apache.jsp.index_jsp</servlet-name>   
  <url-pattern >/index.jsp</url-pattern>   
  </servlet-mapping>   
     
  Find class by name:   
  <servlet>   
  <servlet-name> Org.apache.jsp.index_jsp</servlet-name>   
  <servlet-class>org.apache.jsp.index_ Jsp</servlet-class>   
  </servlet>   
    
  After finding the org.apache.jsp.index_jsp, the object is generated, and the objects such as the generated request,response are initialized with/init (), and the O Method (Doget (), DoPost ()).       For example: your project is under Webapps/javatest, the browser directly accesses: Http://127.0.0.1:8080/javatest/hello