初識Servlet

1.創建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.將創建好的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.將項目部署到tomcat下即可。

總結說明：

1.創建Servlet需繼承Tomcat下servlet-api.jar下的類庫

2.web.xml是項目的配置文件，需要將Servlet配置到該配置文件下

3.Servlet是項目入口

（初學者記錄學習中的總結，希望各位大牛進行點評指正，謝謝大家!）