Eclipse Create servlet

1. Create class: Com.itheima.servlet HelloServlet

Edit Helloservlet.java Class

Editing completed, 5 new methods added.

A, the configuration file implements the Servlet interface.

Move the service method in the 5 methods to the front ( when the client accesses, the background prints the helloservlet ... ）。

B. Configure the servlet to tell the server servlet service.

Configuration file Web. Xml.

<!--to Tomcat , where the servletname is HelloServlet, and the specific path is com.itheima.servlet.HelloServlet--

<servlet>

<servlet-name>HelloServlet</servlet-name>

<servlet-class>com.itheima.servlet.HelloServlet</servlet-class>

</servlet>

<!--register the servlet mappings. servlet-name corresponds to the above specific servlet service,URL-pattern: Client Access Path--

<servlet-mapping>

<servlet-name>HelloServlet</servlet-name>

<url-pattern>/ABC</url-pattern>

</servlet-mapping>

Start error due to incorrect configuration of Url-pattern.

Severity: A child container failed during start

java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [Standardengine[catalina]. Standardhost[localhost]. Standardcontext[/helloservlet]]

At Java.util.concurrent.FutureTask.report (Unknown Source)

Access the test.

2. Inheritance Test

Creates a class that inherits the service method of the parent class.

Public class HelloServlet02 extends httpservlet{

@Override

protected void doget (httpservletrequest req, HttpServletResponse resp) throws Servletexception, IOException {

System. out. println ("HelloServlet ...");

}

}

Configure the Web. xml file.

Test the other two methods.

The service method needs to be commented.

Eclipse Create servlet