初识Servlet

1.创建DispatcherServlet

 package myservlet;

 import java.io.IOException;
 import javax.servlet.ServletException;
 import javax.servlet.annotation.WebServlet;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;

 /**
  * Servlet implementation class Dispatcher
  */
 @WebServlet("/Dispatcher")
 public class Dispatcher extends HttpServlet {
     private static final long serialVersionUID = 1L;

     /**
      * @see HttpServlet#HttpServlet()
      */
     public Dispatcher() {
         super();
         // TODO Auto-generated constructor stub
     }

     /**
      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
      */
     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         // TODO Auto-generated method stub
         response.getWriter().append("Served at: ").append(request.getContextPath());
     }

     /**
      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
      */
     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         // TODO Auto-generated method stub
         doGet(request, response);
     }

 }

2.将创建好的Servlet配置到web.xml

 <servlet>
       <servlet-name>dispatcher</servlet-name>
       <servlet-class>myservlet.DispatcherServlet</servlet-class>
   </servlet>

   <servlet-mapping>
       <servlet-name>dispatcher</servlet-name>
       <url-pattern>/</url-pattern>
   </servlet-mapping>

3.将项目部署到tomcat下即可。

总结说明：

1.创建Servlet需继承Tomcat下servlet-api.jar下的类库

2.web.xml是项目的配置文件，需要将Servlet配置到该配置文件下

3.Servlet是项目入口

（初学者记录学习中的总结，希望各位大牛进行点评指正，谢谢大家!）