import javax.servlet.*;
import javax.servlet.http.*;
import java.io.IOException;
public class HelloWorldServlet implements Servlet {
public void init(ServletConfig config) throws ServletException {
}
public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException {
HttpServletResponse response = (HttpServletResponse) res;
response.setContentType("text/html");
response.getWriter().println("Hello, World!");
}
public void destroy() {
}
public ServletConfig getServletConfig() {
return null;
}
public String getServletInfo() {
return null;
}
}
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
<servlet>
<servlet-name>HelloWorldServlet</servlet-name>
<servlet-class>HelloWorldServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloWorldServlet</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping>
</web-app>
