两种配置Servlet（Servlet3.0以上）方式

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1、在Servlet类中使用@WebServlet Annotation进行配置

package com.icss.dao;

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 FirstServlet
 */
@WebServlet(name="servlet的名字",urlPatterns="servlet映射的URL地址")
public class FirstServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public FirstServlet() {
        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、在web.xml中进行配置

<!-- 配置Servlet的名字 -->
  <servlet>
    <servlet-name>Servlet的名字</servlet-name>
    <servlet-class>Servlet的实现类</servlet-class>
  </servlet>
<!-- 配置Servle的URL -->
  <servlet-mapping>
    <servlet-name>Servlet的名字</servlet-name>
    <url-pattern>Servlet映射的URL地址</url-pattern>
  </servlet-mapping>