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。