登陆注册小Demo实现

1.基础部件

数据库
服务器
程序

2.详细配置

2.1创建项目并搭建服务器，使它们可以运行

2.2 配置数据库

字段要求：除了u_id 和 u_tel外，其他均是 Varchar类型

2.3 整体认知

项目结构

以下均为架包

dao:数据库操作接口定义

daoimpl：接口的实现

daomain:类的定义

service:调用dao方法的接口定义

serviceimpl：接口的实现

servlet:和jsp交互

exception：定义异常

util:数据库工具
数据流

jsp<–>servlet<—>serviceimpl<–>daoimpl<—>DB

2.4 具体代码

类代码

和数据库对应的类的代码

package com.itt.w.domain;public class User {private int u_id;private String u_name;private String u_password;private int u_age;private String u_eamil;private String u_tel;public void setU_id(int u_id) {this.u_id = u_id;}public void setU_name(String u_name) {this.u_name = u_name;}public void setU_password(String u_password) {this.u_password = u_password;}public void setU_age(int u_age) {this.u_age = u_age;}public void setU_eamil(String u_eamil) {this.u_eamil = u_eamil;}public void setU_tel(String u_tel) {this.u_tel = u_tel;}public int getU_id() {return u_id;}public String getU_name() {return u_name;}public String getU_password() {return u_password;}public int getU_age() {return u_age;}public String getU_eamil() {return u_eamil;}public String getU_tel() {return u_tel;}}

用于用户注册时对输入信息检验的类的代码

package com.itt.w.domain;import java.util.HashMap;
import java.util.Map;public class UserConfig {private int u_id;private String u_name;private String u_password;private String u_repassword;private int u_age;private String u_eamil;private String u_tel;//验证错误消息集private Map<String,String> msg = new HashMap<String,String>();public boolean validate(){//检验用户名合法性if ("".equals(u_name)) {msg.put("name","用户名不能为空！");}else if (!u_name.matches("\\w{2,12}")){msg.put("name","用户名必须为2~12位的字母数字组成！");}//检验密码合法性if ("".equals(u_password)) {msg.put("password","密码不能为空！");}else if (!u_password.matches("\\d{6,12}")){msg.put("password","密码必须为6~12位的数字组成！");}//检验二次密码的正确性if (!u_repassword.equals(u_password)) {msg.put("repassword","两次密码不一致！");}//验证邮箱合法性if ("".equals(u_eamil)) {msg.put("eamil","密码不能为空！");}else if (!u_eamil.matches("\\b^['_a-z0-9-\\+]+(\\.['_a-z0-9-\\+]+)*@[a-z0-9-]+(\\.[a-z0-9-]+)*\\.([a-z]{2}|aero|arpa|asia|biz|com|coop|edu|gov|info|int|jobs|mil|mobi|museum|name|nato|net|org|pro|tel|travel|xxx)$\\b")){msg.put("eamil","邮箱格式不正确！");}//验证电话合法性if ("".equals(u_tel)) {msg.put("tel","电话不能为空!");}else if (!u_tel.matches("\\d{11}")){msg.put("tel","电话格式不正确");}
//        //验证日期
//        if("".equals(birthday)){//            msg.put("birthday", "生日不能为空！");
//        }else {//            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
//            try {//                sdf.parse(birthday);
//            } catch (ParseException e) {//                msg.put("birthday", "生日格式不正确！");
//            }
//        }
//        for(Map.Entry<String, String> m: msg.entrySet()){//            System.out.println(m);
//        }//错误会放到这个集合中，若集合为空，返回True,表示用户的注册信息合法return msg.isEmpty();}public void setU_id(int u_id) {this.u_id = u_id;}public void setU_name(String u_name) {this.u_name = u_name;}public void setU_password(String u_password) {this.u_password = u_password;}public void setU_repassword(String u_repassword) {this.u_repassword = u_repassword;}public void setU_age(int u_age) {this.u_age = u_age;}public void setU_eamil(String u_eamil) {this.u_eamil = u_eamil;}public void setU_tel(String u_tel) {this.u_tel = u_tel;}public int getU_id() {return u_id;}public String getU_name() {return u_name;}public String getU_password() {return u_password;}public String getU_repassword() {return u_repassword;}public int getU_age() {return u_age;}public String getU_eamil() {return u_eamil;}public String getU_tel() {return u_tel;}public Map<String, String> getMsg() {return msg;}
}

数据库操作的工具类代码（此处的C3P0只是个名称，内部使用DBUtil实现操作）

package com.itt.w.util;import com.mchange.v2.c3p0.ComboPooledDataSource;import java.sql.*;public class C3P0Util {private static ComboPooledDataSource dataSource = new ComboPooledDataSource();public static Connection getConnection(){String driver = "com.mysql.cj.jdbc.Driver";String url = "jdbc:mysql://localhost:3306/test?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf-8";String username = "root";String password = "123456";Connection conn = null;try {try {Class.forName(driver); //classLoader,加载对应驱动conn = DriverManager.getConnection(url, username, password);return conn;} catch (ClassNotFoundException e) {e.printStackTrace();} catch (SQLException e) {e.printStackTrace();}} catch (Exception e) {throw new RuntimeException("服务器忙");}finally {return conn;}}public static void release(Connection con, Statement st, ResultSet set){if (set != null) {try {set.close();} catch (SQLException e) {e.printStackTrace();}set = null;}if (st != null) {try {st.close();} catch (SQLException e) {e.printStackTrace();}st = null;}if (con != null) {try {con.close();} catch (SQLException e) {e.printStackTrace();}con = null;}}
}

dao

dao代码

package com.itt.w.dao;import com.itt.w.domain.User;public interface UserDao {/** 添加用户* */public void addUser(User user) throws Exception;/** 查找用户* */public User findUser(User user) throws Exception;/** 根据用户名查询用户是否存在* */public boolean findUserByName(String name);
}

daoimpl代码

package com.itt.w.dao.impl;import com.itt.w.dao.UserDao;
import com.itt.w.domain.User;
import com.itt.w.exception.U_ExitException;
import com.itt.w.util.C3P0Util;import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;public class UserDaoImpl implements UserDao {@Overridepublic void addUser(User user) throws Exception {Connection con = null;PreparedStatement ps = null;try {con = C3P0Util.getConnection();ps = con.prepareStatement("insert into user (u_name, u_password, u_eamil, u_tel) values(?, ?, ?, ?)");ps.setString(1, user.getU_name());ps.setString(2, user.getU_password());ps.setString(3, user.getU_eamil());ps.setString(4, user.getU_tel());ps.executeUpdate();} catch (Exception e) {e.printStackTrace();}finally {C3P0Util.release(con, ps, null);}}@Overridepublic User findUser(User user) throws Exception {Connection con = null;PreparedStatement ps = null;ResultSet set = null;User u = null;try {con = C3P0Util.getConnection();ps = con.prepareStatement("select * from user where u_name = ? and u_password = ? ");ps.setString(1, user.getU_name());ps.setString(2, user.getU_password());set = ps.executeQuery();if (set.next()){u = new User();u.setU_id(set.getInt(1));u.setU_name(set.getString(2));u.setU_password(set.getString(3));u.setU_age(set.getInt(4));u.setU_eamil(set.getString(5));u.setU_tel(set.getString(6));}}catch (Exception e){e.printStackTrace();}finally {C3P0Util.release(con, ps, set);}return u;}@Overridepublic boolean findUserByName(String name){Connection con = null;PreparedStatement ps = null;ResultSet set = null;try {con = C3P0Util.getConnection();ps = con.prepareStatement("select * from user where u_name = ?");ps.setString(1, name);set = ps.executeQuery();if (set.next()){return true;}} catch (Exception e){e.printStackTrace();}finally {C3P0Util.release(con, ps, set);}return false;}
}

service

service代码

package com.itt.w.service;import com.itt.w.domain.User;
import com.itt.w.exception.U_Exception;
import com.itt.w.exception.U_ExitException;public interface Userservice {/*** 注册* */public void register (User user) throws Exception;/*** 登陆* */public User login(User user) throws U_Exception;/** 根据用户名查询用户是否存在* */public boolean findUserByName(String name) throws U_ExitException;
}

serviceimpl代码

package com.itt.w.service.impl;import com.itt.w.dao.UserDao;
import com.itt.w.dao.impl.UserDaoImpl;
import com.itt.w.domain.User;
import com.itt.w.exception.U_Exception;
import com.itt.w.exception.U_ExitException;
import com.itt.w.service.Userservice;public class UserServiceImpl implements Userservice {UserDao userDao = new UserDaoImpl();@Overridepublic void register(User user) throws Exception {userDao.addUser(user);}@Overridepublic User login(User user) throws U_Exception {User u = null;try {u = userDao.findUser(user);if (u == null) {throw new U_Exception("用户名和密码错误");}} catch (Exception e) {e.printStackTrace();}return u;}@Overridepublic boolean findUserByName(String name) throws U_ExitException{boolean b = userDao.findUserByName(name);if (b) {throw new U_ExitException("用户名已存在");}return b;}
}

servlet代码

regServlet（注册）

package com.itt.w.web.servlet;import com.itt.w.domain.User;
import com.itt.w.domain.UserConfig;
import com.itt.w.exception.U_ExitException;
import com.itt.w.service.Userservice;
import com.itt.w.service.impl.UserServiceImpl;
import org.apache.commons.beanutils.BeanUtils;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;@WebServlet("/reg")
public class regServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {req.setCharacterEncoding("UTF-8");resp.setContentType("text/html;charset=UTF-8");UserConfig uf = new UserConfig();try {BeanUtils.populate(uf, req.getParameterMap());} catch (Exception e) {e.printStackTrace();}if (!uf.validate()) {//非空证明有错误req.setAttribute("uf",uf);req.getRequestDispatcher("reg.jsp").forward(req,resp);return;}User u = new User();try {BeanUtils.populate(u, req.getParameterMap());Userservice userservice = new UserServiceImpl();//查找用户名是否被注册，已注册会抛出异常System.out.println(u);boolean s = userservice.findUserByName(u.getU_name());userservice.register(u);}catch (U_ExitException e) {e.printStackTrace();req.setAttribute("user_Exit","用户名已存在");req.getRequestDispatcher("reg.jsp").forward(req, resp);} catch (Exception e) {e.printStackTrace();}resp.getWriter().write("注册成功，2秒后跳转至登陆界面！");resp.setHeader("refresh","2;login.jsp");}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {super.doPost(req, resp);}
}

loginServlet代码（登陆）

package com.itt.w.web.servlet;import com.itt.w.domain.User;
import com.itt.w.exception.U_Exception;
import com.itt.w.service.Userservice;
import com.itt.w.service.impl.UserServiceImpl;
import org.apache.commons.beanutils.BeanUtils;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;@WebServlet("/login_test")
public class loginServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException{req.setCharacterEncoding("UTF-8");User user = new User();try {BeanUtils.populate(user, req.getParameterMap());} catch (Exception e) {e.printStackTrace();}Userservice userservice = new UserServiceImpl();User u;try {u = userservice.login(user);if (u != null) {//登陆成功，user对象放入Session中req.getSession().setAttribute("u", user);req.getRequestDispatcher("index.jsp").forward(req, resp);}} catch (U_Exception e) {e.printStackTrace();//错误，跳转回登陆界面req.setAttribute("msg", e.getMessage());resp.sendRedirect(req.getContextPath()+"/login.jsp");
//            req.getRequestDispatcher("login.jsp").forward(req, resp);}}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {doGet(req, resp);}
}

logoutServlet（注销代码）

package com.itt.w.web.servlet;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;@WebServlet("/logout")
public class logoutSerlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {//销毁Sessionreq.getSession().invalidate();resp.sendRedirect("index.jsp");}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {super.doPost(req, resp);}
}

前端代码

<%@ page import="java.util.HashMap" %>
<%@ page import="java.util.Map" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%String name = "";Cookie[] cookies = request.getCookies();for (int i = 0; cookies != null && i < cookies.length; i++) {if (name.equals(cookies[i].getName())) {name = cookies[i].getValue();}}
%><html>
<head><title>Title</title>
</head>
<body><div id="form" class="form_table"><%--action="ss"--%><form action="login_test" method="get"><%String msg = (String) request.getSession().getAttribute("msg");if (msg != null) {out.write(msg);}%><div id="form_username"><span>用户名：</span><input type="text" name="u_name" class="input_text" value=<%=name%> ></div><br><div id="form_password"><span>密&nbsp;&nbsp;&nbsp;&nbsp;码: </span><input type="password" name="u_password" class="input_text" ></div><br><br><input type="submit" value="登陆" onclick="login()"></form>
</div>
</body>
</html>

reg.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>register</title>
</head>
<body>
<form action="reg" method="get"><%String msg = (String) request.getSession().getAttribute("user_Exit");if (msg != null) {out.write(msg);}%><div id="form_username"><span>用户名：</span><input type="text" name="u_name" class="input_text" value=${uf.u_name}>${uf.msg.name}${requestScope.get("user_Exit")}</div><br><div id="reg_password"><span>密&nbsp;&nbsp;码: </span><input type="password" name="u_password" class="input_text" >${uf.msg.password}</div><br><div id="reg_repassword"><span>再次输入密码: </span><input type="password" name="u_repassword" class="input_text" >${uf.msg.repassword}</div><br><div id="reg_age"><span>年&nbsp;&nbsp;&nbsp;&nbsp;龄: </span><input type="text" name="u_age" class="input_text" value="${uf.u_age}" ></div><br><div id="reg_eamil"><span>eamil: </span><input type="text" name="u_eamil" class="input_text" value="${uf.u_eamil}">${uf.msg.eamil}</div><br><div id="reg_tel"><span>电&nbsp;&nbsp;&nbsp;&nbsp;话: </span><input type="text" name="u_tel" class="input_text" value="${uf.u_tel}">${uf.msg.tel}</div><br><br><input type="submit" value="注册">
</form>
</body>
</html>

Start.html

<!DOCTYPE html>
<html lang="en">
<head><meta http-equiv="Content-Type" content="text/html" charset="UTF-8"><title>Start</title><link rel="stylesheet" type="text/css" href="css/myStyle.css"><!--<script type="text/javascript" src="js/myjs.js"></script>-->
</head>
<body><div style="align:center;"><a href="/login.jsp">登陆</a><a href="/reg.jsp">注册</a></div>
</body>
</html>

index.jsp(登陆成功界面)

<%@ page import="javax.naming.InitialContext" %>
<%@ page import="javax.naming.Context" %>
<%@ page import="javax.sql.DataSource" %>
<%@ page import="java.sql.Connection" %><%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html><head><title>My Web Test</title></head><body><c:if test="${empty u}"><a href="login.jsp">登陆</a></c:if><c:if test="${not empty u}">欢迎您：${u.u_name}<a href="logout">注销</a></c:if></body>
</html>

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登陆注册小Demo实现

登陆注册小Demo实现

1.基础部件

2.详细配置

2.1创建项目并搭建服务器，使它们可以运行

2.2 配置数据库

2.3 整体认知

2.4 具体代码

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