直接上图，不废话！！！
第一：首先在Eclipse的包资源管理器中，单机鼠标右键，在弹出的快捷键菜单中选择“新建”/Servlet命令，在弹出的对话框中输入新建的Servlet所在的包和类名，然后单击下一步，
我选择默认，Next
依旧默认，Next
注意事项，在创建web的工程的时候需要注意的是如下图，选择上web.xml这个按钮，因为Servlet需要配置一下web.xml这个文件，web.xml在web-inf这个文件下面
上图第二个箭头前面有个方括号，勾选上就可以自动创建好web.xml这个文件了。
package com.ningmeng; import java.io.IOException;
import java.io.PrintWriter; 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("/FirstServlet")
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.setContentType("text/html");
response.setCharacterEncoding("GBK");
PrintWriter out=response.getWriter();
out.print("<HTML>");
out.println("<HEAD><TITLE>Servlet实例</TITLE></HEAD>");
out.println("<BODY>");
out.println("servlet实例");
out.println(this.getClass());
out.println("</BODY>");
out.println("</HTML>");
out.flush();
out.close();
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);
} }
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>web02</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<!-- 声明Servlet对象 -->
<servlet-name>FirstServlet</servlet-name>
<!-- 上面一句指定Servlet对象的名称 -->
<servlet-class>com.ningmeng.FirstServlet</servlet-class>
<!-- 上面一句指定Servlet对象的完整位置，包含包名和类名 -->
</servlet>
<servlet-mapping>
<!-- 映射Servlet -->
<servlet-name>FirstServlet</servlet-name>
<!--<servlet-name>与上面<Servlet>标签的<servlet-name>元素相对应，不可以随便起名 -->
<url-pattern>/FirsetServlet</url-pattern>
<!-- 上面一句话用于映射访问URL -->
</servlet-mapping>
</web-app>
运行效果如下图所示
