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>
原文地址：https://www.cnblogs.com/fanqiexin/p/11079330.html
时间： 2024-10-12 21:28:13