导入包lib(文件名称)
目录结构：web下：views、web-inf、index.jsp
views下各种jsp文件和js(里面放封装好的jquery包)
js下：jquery包(js文件后缀)
web-inf目录下：classes（编译输出路径）、lib、 web.xml
首先编写index.jsp文件
<form method="post" action="/touhou/isLogin"> <input type="text" required name="admin" ><br/><br/> <input type="password" required name="password" ><br/><br/> <span id="errorMessage"> ${error}</span><br/><br/> <input type="submit" value="LinkStart"> </form>
接着响应表单提交的servlet “isLogin”
package com.aaa.servlet; import com.aaa.dao.IUserDAO; import com.aaa.dao.impl.UserDAOImpl; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.util.Map; @WebServlet("/isLogin") public class IsLoginServlet extends HttpServlet { @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //设置编码格式为UTF-8 req.setCharacterEncoding("UTF-8"); //将表单中获取到的元素提取出来 String admin=req.getParameter("admin"); String password=req.getParameter("password"); //将这些元素引入dao层进行比对 IUserDAO userDAO = new UserDAOImpl(); Map<String, Object> map = userDAO.isLogin(admin, password); //查看比对结果并进行相应后续处理 if(map!=null){ //map不为空时设置map属性值并请求转发到登陆成功的主页 req.setAttribute("map",map); System.out.println(map); req.getRequestDispatcher("/views/loginSuccess.jsp").forward(req,resp); }else { //失败时将错误信息传递给 req.setAttribute("error","账号或者密码不正确"); req.getRequestDispatcher("/index.jsp").forward(req,resp); } } }
当然，最后判断是否成功
<%-- Created by IntelliJ IDEA. User: Administrator Date: 2019/6/24 Time: 10:43 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <%--进行list循环时需要用到的--%> <html> <head> <title>Title</title> </head> <%--添加jquery代码实现--%> <script src="js/jquery-2.1.0.js"></script> <body> <span>欢迎你，可爱的${map.mininame}</span> </body> </html>