注册，登陆的Servlet、dao、service、domain、jsp页面、

登陆的JSP页面代码：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>会员登录</title>
<link rel="stylesheet" href="css/bootstrap.min.css" type="text/css" />
<script src="js/jquery-1.11.3.min.js" type="text/javascript"></script>
<script src="js/bootstrap.min.js" type="text/javascript"></script>
<!-- 引入自定义css文件 style.css -->
<link rel="stylesheet" href="css/style.css" type="text/css" />

<style>
body {
    margin-top: 20px;
    margin: 0 auto;
}

.carousel-inner .item img {
     100%;
    height: 300px;
}

.container .row div {
    /* position:relative;
                 float:left; */
    
}

font {
    color: #666;
    font-size: 22px;
    font-weight: normal;
    padding-right: 17px;
}
</style>
</head>
<body>

    <!-- 引入header.jsp -->
    <jsp:include page="/header.jsp"></jsp:include>


    <div class="container"
        style=" 100%; height: 460px; background: #FF2C4C url('images/loginbg.jpg') no-repeat;">
        <div class="row">
            <div class="col-md-7">
                <!--<img src="./image/login.jpg" width="500" height="330" alt="会员登录" title="会员登录">-->
            </div>

            <div class="col-md-5">
                <div
                    style=" 440px; border: 1px solid #E7E7E7; padding: 20px 0 20px 30px; border-radius: 5px; margin-top: 60px; background: #fff;">
                    <font>会员登录</font>USER LOGIN
　　　　　　　　　　　　　　//提示验证码，密码或用户名错误的地方
                    <div style="color:red"><%=request.getAttribute("loginInfo")==null?"":request.getAttribute("loginInfo") %></div>
                    
　　　　　　　　　　　　　　<form class="form-horizontal" action="/Market/LoginServlet" method="post">
                        <div class="form-group">
                            <label for="username" class="col-sm-2 control-label">用户名</label>
                            <div class="col-sm-6">
                                <input type="text" class="form-control" id="username"
                                name="username"    placeholder="请输入用户名">
                            </div>
                        </div>
                        <div class="form-group">
                            <label for="inputPassword3" class="col-sm-2 control-label">密码</label>
                            <div class="col-sm-6">
                                <input type="password" class="form-control" id="inputPassword3"
                                name="password"    placeholder="请输入密码">
                            </div>
                        </div>
                        <div class="form-group">
                            <label for="inputPassword3" class="col-sm-2 control-label">验证码</label>
                            <div class="col-sm-3">
                                <input type="text" class="form-control" id="inputPassword3"
                                    placeholder="请输入验证码" name="checkcode">
                            </div>
                            <div class="col-sm-3">
                                <img src="/Market/CheckImgServlet" onclick="checkImg(this)" />
                            </div>
                        </div>
                        <div class="form-group">
                            <div class="col-sm-offset-2 col-sm-10">
                                <div class="checkbox">
                                    <label> <input type="checkbox"> 自动登录
                                    </label>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <label> <input
                                        type="checkbox"> 记住用户名
                                    </label>
                                </div>
                            </div>
                        </div>
                        <div class="form-group">
                            <div class="col-sm-offset-2 col-sm-10">
                                <input type="submit" width="100" value="登录" name="submit"
                                    style="background: url('./images/login.gif') no-repeat scroll 0 0 rgba(0, 0, 0, 0); height: 35px;  100px; color: white;">
                            </div>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>

    <!-- 引入footer.jsp -->
    <jsp:include page="/footer.jsp"></jsp:include>

</body>
</html>
<script type="text/javascript">
function checkImg(obj){
    obj.src="/Market/CheckImgServlet?time="+new Date().getTime();
}
</script>

登陆的Servlet代码：

package com.oracle.demo01;

import java.io.IOException;
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 service.UsersService;

public class LoginServlet extends HttpServlet {
private UsersService usersService=new UsersService();
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //解决中文乱码
        request.setCharacterEncoding("utf-8");
        //获取用户名和密码
        String username=request.getParameter("username");
        String password=request.getParameter("password");
        //获取验证码
        String checkcode=request.getParameter("checkcode");
        //获取Session域中的验证码
        HttpSession session=request.getSession();
        String code=(String)session.getAttribute("checkcode_session");
        if(!checkcode.equals(code)){
            request.setAttribute("loginInfo","验证码错误" );
            request.getRequestDispatcher("/login.jsp").forward(request, response);
        return;
        }
        //获取Service的方法
        int count=usersService.loginUser(username, password);
        if(count>0){
            response.sendRedirect(request.getContextPath());
        }else{
            //请求转发
            request.setAttribute("loginInfo", "用户名或密码错误");
            request.getRequestDispatcher("/login.jsp").forward(request, response);
        }
    }

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

注册的JSP页面代码：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head></head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>会员注册</title>
<link rel="stylesheet" href="css/bootstrap.min.css" type="text/css" />
<script src="js/jquery-1.11.3.min.js" type="text/javascript"></script>
<script src="js/bootstrap.min.js" type="text/javascript"></script>
<!-- 引入自定义css文件 style.css -->
<link rel="stylesheet" href="css/style.css" type="text/css" />

<style>
body {
    margin-top: 20px;
    margin: 0 auto;
}

.carousel-inner .item img {
     100%;
    height: 300px;
}

font {
    color: #3164af;
    font-size: 18px;
    font-weight: normal;
    padding: 0 10px;
}
</style>
<script type="text/javascript">
function checkImg(){
    obj.src = "/Store/CheckImgServlet?time ="+Math.random();
}
</script>
<!-- <script type="text/javascript">
    function checkname(obj){
        var name=document.getElementById("username").value;
        location.href="/Market/CheckUsernameServlet?"
    }
</script> -->
</head>
<body>

    <!-- 引入header.jsp -->
    <jsp:include page="/header.jsp"></jsp:include>

    <div class="container"
        style=" 100%; background: url('image/regist_bg.jpg');">
        <div class="row">
            <div class="col-md-2"></div>
            <div class="col-md-8"
                style="background: #fff; padding: 40px 80px; margin: 30px; border: 7px solid #ccc;">
                <font>会员注册</font>USER REGISTER
                <div style="color:red"><%=request.getAttribute("loginInfo")==null?"":request.getAttribute("loginInfo") %></div>
                <form class="form-horizontal" style="margin-top: 5px;" action="/Market/RegisterServlet" method="post">
                    <div class="form-group">
                        <label for="username" class="col-sm-2 control-label">用户名</label>
                        <div class="col-sm-6">
                            <input type="text" class="form-control" id="username"
                                placeholder="请输入用户名" name="username" >
                        </div>
                    </div>
                    <div class="form-group">
                        <label for="inputPassword3" class="col-sm-2 control-label">密码</label>
                        <div class="col-sm-6">
                            <input type="password" class="form-control" id="inputPassword3"
                                placeholder="请输入密码" name="password">
                        </div>
                    </div>
                    <div class="form-group">
                        <label for="confirmpwd" class="col-sm-2 control-label">确认密码</label>
                        <div class="col-sm-6">
                            <input type="password" class="form-control" id="confirmpwd"
                                placeholder="请输入确认密码">
                        </div>
                    </div>
                    <div class="form-group">
                        <label for="inputEmail3" class="col-sm-2 control-label">Email</label>
                        <div class="col-sm-6">
                            <input type="email" class="form-control" id="inputEmail3"
                                placeholder="Email" name="email">
                        </div>
                    </div>
                    <div class="form-group">
                        <label for="usercaption" class="col-sm-2 control-label">姓名</label>
                        <div class="col-sm-6">
                            <input type="text" class="form-control" id="usercaption"
                                placeholder="请输入姓名" name="name">
                        </div>
                    </div>
                    <div class="form-group opt">
                        <label for="inlineRadio1" class="col-sm-2 control-label">性别</label>
                        <div class="col-sm-6">
                            <label class="radio-inline"> 
                            <input type="radio" name="sex" id="sex1" value="male">
                                男
                            </label> 
                            <label class="radio-inline"> 
                            <input type="radio" name="sex" id="sex2" value="female">
                                女
                            </label>
                        </div>
                    </div>
                    <div class="form-group">
                        <label for="date" class="col-sm-2 control-label">出生日期</label>
                        <div class="col-sm-6">
                            <input type="date" class="form-control" name="birthday">
                        </div>
                    </div>

                    <div class="form-group">
                        <label for="date" class="col-sm-2 control-label">验证码</label>
                        <div class="col-sm-3">
                            <input type="text" class="form-control" name="checkCode" placeholder="请输入验证码">

                        </div>
                        <div class="col-sm-2">
                            <img src="/Market/CheckImgServlet" onclick="checkImg(this)" />
                        </div>

                    </div>

                    <div class="form-group">
                        <div class="col-sm-offset-2 col-sm-10">
                            <input type="submit" width="100" value="注册" name="submit"
                                style="background: url('./images/register.gif') no-repeat scroll 0 0 rgba(0, 0, 0, 0); height: 35px;  100px; color: white;">
                        </div>
                    </div>
                </form>
            </div>

            <div class="col-md-2"></div>

        </div>
    </div>

    <!-- 引入footer.jsp -->
    <jsp:include page="/footer.jsp"></jsp:include>

</body>
</html>
<script type="text/javascript">
function checkImg(obj){
    obj.src="/Market/CheckImgServlet?time="+new Date().getTime();
}
</script>

注册的Servlet代码

package com.oracle.demo01;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;
import java.util.UUID;

import javax.servlet.ServletContext;
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 org.apache.commons.beanutils.BeanUtils;

import domain.Users;
import service.UsersService;

public class RegisterServlet extends HttpServlet {
    private UsersService userService=new UsersService();
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //response.setContentType("text/html;charset=UTF-8");
        request.setCharacterEncoding("utf-8");//解决中文乱码
        Map<String,String[]> map = request.getParameterMap();
        Users user=new Users();
        //BeanUtils工作原理：将map中的数据根据key与实体中的属性的对应关系封装，只要key的名字与实体中的属性名字一样，就能封装到实体中
        try {
            BeanUtils.populate(user, map);
        } catch (IllegalAccessException | InvocationTargetException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //手动封装没有的数据
        //UUID---------随机不重复的32位字符串---java代码生成后是36位
        user.setUid(UUID.randomUUID().toString());
        String username=request.getParameter("username");
        //获取验证码
        String checkcode=request.getParameter("checkCode");
        //获取Session域中的验证码
        HttpSession session=request.getSession();
        String code=(String)session.getAttribute("checkcode_session");
        if(!checkcode.equals(code)){
            request.setAttribute("loginInfo","验证码错误,请重新输入" );
            request.getRequestDispatcher("/register.jsp").forward(request, response);//跳转
        return;
        }
        //调用Service的注册方法
        int  row = userService.register(user);
        if(row>0){
            response.sendRedirect(request.getContextPath()+"/login.jsp");
        }else{
            response.sendRedirect(request.getContextPath()+"/register.jsp");
        }    
    }
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
        
    }
}

注册的domain代码：

package domain;

public class Users {
    private String uid;
    private String username;
    private String password;
    private String name;
    private String email;
    private String telephone;
    private String birthday;
    private String sex;
    private int state;
    private String code;
    public String getUid() {
        return uid;
    }
    public void setUid(String uid) {
        this.uid = uid;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    public String getTelephone() {
        return telephone;
    }
    public void setTelephone(String telephone) {
        this.telephone = telephone;
    }
    public String getBirthday() {
        return birthday;
    }
    public void setBirthday(String birthday) {
        this.birthday = birthday;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    public int getState() {
        return state;
    }
    public void setState(int state) {
        this.state = state;
    }
    public String getCode() {
        return code;
    }
    public void setCode(String code) {
        this.code = code;
    }
    @Override
    public String toString() {
        return "Users [uid=" + uid + ", username=" + username + ", password=" + password + ", name=" + name + ", email="
                + email + ", telephone=" + telephone + ", birthday=" + birthday + ", sex=" + sex + ", state=" + state
                + ", code=" + code + "]";
    }
    
}

注册的Dao代码

package dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import domain.Users;
import tools.JDBCUtils;

public class UsersDao {
    //注册
    public int register(Users user) throws SQLException{
        Connection conn=JDBCUtils.getConn();
        String sql="insert into users(uid,username,password,name,email,birthday,sex) values(?,?,?,?,?,?,?)";
        PreparedStatement pst=conn.prepareStatement(sql);
        pst.setString(1,user.getUid());
        pst.setString(2, user.getUsername());
        pst.setString(3, user.getPassword());
        pst.setString(4, user.getName());
        pst.setString(5, user.getEmail());
        pst.setString(6, user.getBirthday());
        pst.setString(7, user.getSex());
        int row = pst.executeUpdate();
        return row; 
    }
    //登陆
    public int loginUser(String username,String password) throws SQLException{
        Connection conn=JDBCUtils.getConn();
        String sql="select count(*) from users where username=? and password=?";
        PreparedStatement pst=conn.prepareStatement(sql);
        pst.setString(1, username);
        pst.setString(2, password);
        ResultSet rs=pst.executeQuery();
        int count=0;
        while(rs.next()){
            count=rs.getInt(1);
        }
        JDBCUtils.close(conn, pst, rs);
        return count;
    }
}

注册的service代码：

package service;

import java.sql.SQLException;

import dao.UsersDao;
import domain.Users;

public class UsersService {
    private UsersDao userDao=new UsersDao();
    //注册
    public int register(Users user){
        int row=0;
        try {
            row=userDao.register(user);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return row;
    }
    //登陆
    public int loginUser(String username,String password){
        int count=0;
        try {
            count=userDao.loginUser(username, password);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return count;
    }
}

web。xml代码

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>Market</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
    <description></description>
    <servlet-name>CheckImgServlet</servlet-name>
    <servlet-class>yanzhengma.CheckImgServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>CheckImgServlet</servlet-name>
    <url-pattern>/CheckImgServlet</url-pattern>
  </servlet-mapping>
  <servlet>
    <description></description>
    <servlet-name>RegisterServlet</servlet-name>
    <servlet-class>com.oracle.demo01.RegisterServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>RegisterServlet</servlet-name>
    <url-pattern>/RegisterServlet</url-pattern>
  </servlet-mapping>
  <servlet>
    <description></description>
    <display-name>LoginServlet</display-name>
    <servlet-name>LoginServlet</servlet-name>
    <servlet-class>com.oracle.demo01.LoginServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>LoginServlet</servlet-name>
    <url-pattern>/LoginServlet</url-pattern>
  </servlet-mapping>
  <servlet>
    <description></description>
    <display-name>CheckUsername</display-name>
    <servlet-name>CheckUsername</servlet-name>
    <servlet-class>com.oracle.demo01.CheckUsername</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>CheckUsername</servlet-name>
    <url-pattern>/CheckUsername</url-pattern>
  </servlet-mapping>
</web-app>

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原文地址：https://www.cnblogs.com/yang1182/p/9857123.html