参考文章 http://felix2010.blog.sohu.com/158246791.html
在看《javaweb开发详解》孙鑫，书里6.2.2讲了一个利用html页面输入姓名然后反馈welcome信息的实例，书上是用命令行实现的，本文将用eclipse实现了这一例子。
1、在工程中编写WelcomeYou.java
package shan.servlet.study;
import java.io.PrintWriter;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class WelcomeYou
*/
public class WelcomeYou extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public WelcomeYou() {
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
String user=request.getParameter("user");
String welcomeInfo="Welcome you, "+user;
response.setContentType("text/html");
PrintWriter out=response.getWriter();
out.println("<html><head><title>");
out.println("Welcome Page");
out.println("</title></head>");
out.println("<body>");
out.println(welcomeInfo);
out.println("</body></html>");
out.close();
}
/**
* @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、这时eclipse已经帮忙生成了web.xml，一般来说，有关部分是这个样子的
<servlet>
<description></description>
<display-name>WelcomeYou</display-name>
<servlet-name>WelcomeYou</servlet-name>
<servlet-class>shan.servlet.study.WelcomeYou</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>WelcomeYou</servlet-name>
<url-pattern>/WelcomeYou</url-pattern>
</servlet-mapping>
3、在eclipse中右键工程——new——HTML File ，命名为Welcome.html。这时要注意，一定要放在默认的WebContent 目录下。
4、编辑Welcome.html，注意
<form action="WelcomeYou" method="get">里的WelcomeYou一定要和web.xml文件里的<url-pattern>/WelcomeYou</url-pattern>一致。
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Welcom you!</title> </head> <body> <form action="WelcomeYou" method="get"> 请输入用户名<input type="text" name="user"><p> <input type="submit" value="提交"> </form> </body> </html>
5、在eclipse 里运行一遍 WelcomeYou.java
6、打开浏览器，输入http://localhost:8080/MyFirstDynanicWebProject/Welcome.html 其中MyFirstDynanicWebProject是我的工程名，这里要换成你的工程名。输入内容，回车，就可以看到结果了。
在eclipse里建立简单的“输入——反馈”型的web项目实例
原文：http://www.cnblogs.com/yangdm/p/5012302.html