一、新建一个工程
二、为工程起名字；并导入本地环境tomcat的路径
三、工程建立完成后，展开工程，建立类和jsp页面，jsp页面名注意首字母大写
四、建立类，类名首字母也大写，先建包
包名全部小写
五、编辑Login.jsp界面，和html类似，首先把把编码格式改成UTF-8中文编码（三处），这里我们要写的是登陆界面，所以用的是form表单，action=后面跟的是我们建立的java的类名，建立和后台的联系。method方法有get和post
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>登陆界面</title> </head> <body> <form action="LoginController" method="get"> 用户名：<input type="text" name="userName"> 密码：<input type="text" name="userName"> <input type=submit value="login"> </form> </body> </html> 六、编辑LoginController，其实现在前端和后台已经建立了联系，于是写了个输出测试了一下 package com.cn.jdbc.controller; 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 LoginController */ @WebServlet("/LoginController") public class LoginController extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public LoginController() { 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()); String userName=request.getParameter("userName"); System.out.println(userName); } /** * @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); } }七、用上面同样的方式建立登陆的jsp和java（Register.jsp和RegisterController.java），然后在登陆界面加入注册链接
<a href="Register.jsp">免费注册</a> <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>注册页面</title> </head> <body> <form action="RegisterController" method="get"> 用户名：<input type="text" name="userName"/> 密码：<input type="password" name="pwd"/> 确认密码：<input type="password" name="pwd2"/> <input type="submit" value="注册登录"/> </form> </body> </html>