标签：功能登录 user request User import com bai

优化页面

jsp代码

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <meta charset="utf-8">
    <title>列表展示</title>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <!-- 上述3个meta标签*必须*放在最前面 任何其他内容都*必须*跟随其后-->

    <!-- Bootstrap -->
    <link href="css/bootstrap.min.css" rel="stylesheet">

    <!-- jQuery(Bootstrap的所有javaScrpt插件都依赖) -->
    <script src="js/bootstrap.min.js"></script>
    <!-- 加载Bootstrap 的所有 javaScript插件 你也可以根据需要只加载单个插件 -->
    <script src="./js/bootstrap.js"></script>
    <script src="text/javascript"></script>
</head>
<body>
    <h3 style="text-align: center">用户信息列表</h3>
<div style="float: right;margin: 5px;">
    <a class="btn btn-primary" href="add.html">添加联系人</a>
    <a class="btn btn-primary" href="add.html">删除选择</a>
</div>

<form class="form-inline">
    <div class="form-group">
        <label for="exampleInputName2">姓名</label>
        <input type="text" class="form-control" id="exampleInputName2">
    </div>
    <div class="form-group">
        <label for="exampleInputName3">籍贯</label>
        <input type="text" class="form-control" id="exampleInputName3">
    </div>
    <div class="form-group">
        <label for="exampleInputEmail2">邮箱</label>
        <input type="email" class="form-control" id="exampleInputEmail2">
    </div>
    <button type="submit" class="btn btn-default">查询</button>
</form>



<table border="1" class="table table-bordered table-hover">
    <tr class="success">
        <th><input type="checkbox"></th>
        <th>编号</th>
        <th>姓名</th>
        <th>性别</th>
        <th>年龄</th>
        <th>籍贯</th>
        <th>QQ</th>
        <th>邮箱</th>
        <th>操作</th>
    </tr>

    <c:forEach items="${users}" var="user" varStatus="s">
        <tr>
            <td><input type="checkbox"></td>
            <td>${s.count}</td>
            <td>${user.name}</td>
            <td>${user.gender}</td>
            <td>${user.age}</td>
            <td>${user.address}</td>
            <td>${user.qq}</td>
            <td>${user.email}</td>
            <td><a class="btn btn-default btn-sm" href="update.html">修改</a>&nbsp;<a class="btn btn-default btn-sm" href="">删除</a></td>
        </tr>
    </c:forEach>
</table>
    <div>
        <nav aria-label="Page navigation">
            <ul class="pagination">
                <li>
                    <a href="#" aria-label="Previous">
                        <span aria-hidden="true">&laquo;</span>
                    </a>
                </li>
                <li><a href="#">1</a></li>
                <li><a href="#">2</a></li>
                <li><a href="#">3</a></li>
                <li><a href="#">4</a></li>
                <li><a href="#">5</a></li>
                <li>
                    <a href="#" aria-label="Next">
                        <span aria-hidden="true">&raquo;</span>
                    </a>
                </li>
                <span style="font-size: 25px;margin-left: 5px;">
                    共16条记录，共4页
                </span>

            </ul>
        </nav>
    </div>
</body>
</html>

登录功能

jsp登录页面

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2022/8/17
  Time: 13:36
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <meta charset="utf-8">
    <title>登录页面</title>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <!-- 上述3个meta标签*必须*放在最前面 任何其他内容都*必须*跟随其后-->

    <!-- Bootstrap -->
    <link href="css/bootstrap.min.css" rel="stylesheet">

    <!-- jQuery(Bootstrap的所有javaScrpt插件都依赖) -->
    <script src="js/bootstrap.min.js"></script>
    <!-- 加载Bootstrap 的所有 javaScript插件 你也可以根据需要只加载单个插件 -->
    <script src="./js/bootstrap.js"></script>
    <script src="text/javascript"></script>
    <script>
        function refreshCode() {
            //1.获取验证码图片对象
            let vcode = document.getElementById("vcode");
            //2.设置其他src属性
            vcode.src="${pageContext.request.contextPath}/CheckCodeServlet?time="+new Date().getTime();
        }
    </script>
</head>
<body>
<div class="container" style="width: 400px;">
    <h3 style="text-align: center;">管理员登录</h3>
    <form action="${pageContext.request.contextPath}/LoginServlet" method="post">
        <div class="form-group">
            <label for="user">用户名：</label>
            <input type="text" name="username" class="form-control" id="user" placeholder="请输入用户名"/>
        </div>

        <div class="form-group">
            <label for="password">密码：</label>
            <input type="password" name="password" class="form-control" id="password" placeholder="请输入密码"/>
        </div>

        <div class="form-inline">
            <label for="vcode">验证码：</label>
            <input type="text" name="verifycode" class="form-control" id="verifycode" placeholder="请输入验证码" style="width: 120px;"/>
            <a href="javascript:refreshCode()">
                <img src="${pageContext.request.contextPath}/CheckCodeServlet" title="看不清点击刷新" id="vcode"/>
            </a>
        </div>
        <hr/>
        <div class="form-group" style="text-align: center;">
            <input class="btn btn btn-primary" type="submit" value="登录">
        </div>
    </form>

    <!-- 出错显示的信息框 -->
    <div class="alert alert-warning alert-dismissible" role="alert">
        <button type="button" class="close" data-dismiss="alert" >
            <span>&times;</span></button>
        <strong>${login_msg}</strong>
    </div>
</div>
</body>
</html>

LoginServlet类

package com.bai.web.servlet;

import com.bai.domain.User;
import com.bai.service.UserService;
import com.bai.service.img.UserServiceImpl;
import org.apache.commons.beanutils.BeanUtils;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;

public class LoginServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);

    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        //1、设置编码
        request.setCharacterEncoding("UTF-8");

        //2、获取数据
        String verifycode = request.getParameter("verifycode");
        //3、验证码校验
        HttpSession session = request.getSession();
        String checkcode_server = (String) session.getAttribute("CHECKCODE_SERVER");
        session.removeAttribute("CHECKCODE_SERVER");//确保验证码一次性
        if (!checkcode_server.equalsIgnoreCase(verifycode)) {
            //验证码错误
            //提示信息
            request.setAttribute("login_msg", "验证码错误");
            //跳转登陆页面
            request.getRequestDispatcher("/login.jsp").forward(request, response);
            return;
        }

        Map<String, String[]> map = request.getParameterMap();
        //4、封装User对象
        User user = new User();
        try {
            BeanUtils.populate(user, map);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }


        //5、调用Service查询
        UserService service = new UserServiceImpl();
        User login = service.login(user);
        //6、判断是否登陆成功
        if (login != null) {
            //登陆成功
            //将用户存入session
            session.setAttribute("user", login);
            //跳转页面
            response.sendRedirect(request.getContextPath() + "/index.jsp");
        } else {
            //登陆失败
            //提示信息
            request.setAttribute("login_msg", "用户名或密码错误");
            //跳转登陆页面
            request.getRequestDispatcher("/login.jsp").forward(request, response);
        }
    }

}

UserDao接口

package com.bai.dao;

import com.bai.domain.User;

import java.util.List;

/**
 * 用户操作的Dao
 */
public interface UserDao {
    public List<User> findAll();

    public User findUserByUsernameAndPassword(String username,String password);

}

UserDaoImpl类

package com.bai.dao.Impl;

import com.bai.dao.UserDao;
import com.bai.domain.User;
import com.bai.util.JDBCUtils;
import org.springframework.dao.DataAccessException;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;

import java.util.List;

public class UserDaoImpl implements UserDao {

    private JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());
    public List<User> findAll() {
        //使用JDBC操作数据库
        //1.定义sql
        String sql="select * from user";
        List<User> query = template.query(sql, new BeanPropertyRowMapper<User>(User.class));
        return query;
    }

    public User findUserByUsernameAndPassword(String username, String password) {
        try {
            String sql = "select * from user1 where username = ? and password = ?";
            User user = template.queryForObject(sql, new BeanPropertyRowMapper<User>(User.class), username,password);
            return user;
        } catch (DataAccessException e) {
            e.printStackTrace();
            return null;
        }
    }
}

UserService接口

package com.bai.service;

import com.bai.domain.User;

import java.util.List;

/**
 * 用户管理的业务接口
 */
public interface UserService {
    /**
     * 查询所有用户信息
     */
    public List<User> findAll();

    public User login(User user);


}

UserServiceImpl类

package com.bai.service.img;

import com.bai.dao.Impl.UserDaoImpl;
import com.bai.dao.UserDao;
import com.bai.domain.User;
import com.bai.service.UserService;

import java.util.List;

public class UserServiceImpl implements UserService {

    private UserDao dao=new UserDaoImpl();
    //调用Dao完成查询
    public List<User> findAll() {
        //调用Dao完成查询
        return dao.findAll();
    }

    public User login(User user) {
        return dao.findUserByUsernameAndPassword(user.getUsername(),user.getPassword());
    }


}

标签：功能,登录,user,request,User,import,com,bai
From： https://www.cnblogs.com/aimz01/p/16595435.html

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