上一篇eclipse搭建maven web项目这里实现简单的servlet传参小Demo，项目结构：

1.pom.xml文件加入servlet包

  4.0.0
  com.citywy
  mytest02
  war
  0.0.1-SNAPSHOT
  
    
      junit
      junit
      3.8.1
      test
    
    
        
        javax.servlet
        servlet-api
        2.5
        provided
    
  
  
    mytest02
  

2.UserServlet.java

package com.citywy.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class UserServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
    public UserServlet() {
        super();
    }

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doPost(request, response);
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("utf-8");
		response.setContentType("text/html;charset=utf-8");
		String name=request.getParameter("uname");
		String pwd=request.getParameter("upwd");
		System.out.println("输出"+name+"--"+pwd);
		request.setAttribute("someinfo", "这是登陆成功提示信息！");
		request.getRequestDispatcher("index.jsp").forward(request, response);
	}

}

3.web.xml

  Archetype Created Web Application
  
    
    UserServlet
    UserServlet
    com.citywy.servlet.UserServlet
  
  
    UserServlet
    /UserServlet
  

4.index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>  
<%  
String path = request.getContextPath();  
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";  
%>  
  
  
  
    
      
      
      
      
          
      
      
    
  
  
    
  
        
用户登录
          
        
  
       	 	 用户名:
  
       		 密  码：
  
              
              
            ${someinfo }
        
    
  
  

运行效果如图：

TIP：在Tomcat中运行时出现了无法加载到wtpwebapps或webapps下的情况，解决方案是servers下右击clean：将原先编译到tomcat服务器上的程序，先清除掉，然后再重新编译。