JavaWeb簡(jiǎn)單用戶登錄注冊(cè)實(shí)例代碼(有驗(yàn)證碼)
需求
- 編寫login登錄界面(用戶名,密碼,驗(yàn)證碼,登陸按鈕,注冊(cè)按鈕)
- 設(shè)計(jì)關(guān)系數(shù)據(jù)庫(編號(hào),用戶名,密碼)
- 編寫注冊(cè)功能,將數(shù)據(jù)存儲(chǔ)在數(shù)據(jù)庫中。(姓名不能重復(fù),設(shè)為主鍵,重復(fù)會(huì)注冊(cè)失?。?/li>
- 編寫登錄功能 。首先獲取驗(yàn)證碼,先判斷驗(yàn)證碼是否正確,不正確則顯示驗(yàn)證碼錯(cuò)誤。驗(yàn)證碼正確后再獲取用戶名和密碼,進(jìn)行數(shù)據(jù)庫的搜索比對(duì),若正確則重定向到成功的界面,并且將用戶名顯示。
jar包

技術(shù)選型
Servlet + JSP + Mysql + JDBCTemplate + Druid + BeanUtils + Tomcat
效果圖
驗(yàn)證碼或者用戶名和密碼錯(cuò)誤


Navicat Premium 顯示Mysql內(nèi)容

登錄成功

注冊(cè)功能


源碼
登錄主界面 login.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Login</title>
<script>
<%-- 增加時(shí)間戳來更換驗(yàn)證碼圖片 --%>
window.onload=function(){
document.getElementById("img").onclick=function(){
this.src = "/daydayup/checkCodeServlet?time" + new Date().getTime();
}
}
<%-- 用于打開注冊(cè)的窗口--%>
function reg() {
window.open("register.jsp");
}
</script>
<style>
div{
color: red;
}
</style>
</head>
<body>
<form action="/daydayup/loginServlet" method="post">
<table>
<tr>
<td>用戶名</td>
<td><input type="text" name="username"></td>
</tr>
<tr>
<td>密碼</td>
<td><input type="text" name="password"></td>
</tr>
<tr>
<td>驗(yàn)證碼</td>
<td><input type="text" name="checkcode"></td>
</tr>
<tr>
<td colspan="2"><img id="img" src="/daydayup/checkCodeServlet" alt=""></td>
</tr>
<tr>
<td><input type="submit" value="登錄"></td>
<td><input type="button" value="注冊(cè)" onclick="reg()" ></td>
</tr>
</table>
</form>
<div>${requestScope.login_error}</div>
<div>${requestScope.checkcode_error}</div>
</body>
</html>
注冊(cè)界面 register.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form action="/daydayup/registerServlet" method="post">
<table>
<tr>
<td>用戶名</td>
<td><input type="text" name="username"></td>
</tr>
<tr>
<td>密碼</td>
<td><input type="text" name="password"></td>
</tr>
<tr>
<td><input type="submit" value="確定注冊(cè)"></td>
</tr>
</table>
</form>
<div>${requestScope.register_success}</div>
<div>${requestScope.register_error}</div>
</body>
</html>
成功界面 success.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<%-- <h1>${requestScope.user},歡迎您</h1> --%>
<h1><%=request.getSession().getAttribute("user")%>,歡迎您</h1>
</body>
</html>
先編輯好JDBCUtils工具類
package cn.code.util;
import com.alibaba.druid.pool.DruidDataSourceFactory;
import javax.sql.DataSource;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;
/**
* JDBC工具類 使用Durid連接池
*/
public class JDBCUtils {
private static DataSource ds;
static{
try {
//加載配置文件
Properties pro = new Properties();
//使用ClassLoader加載配置文件,獲取字節(jié)輸入流
InputStream is = JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties");
pro.load(is);
//初始化連接池對(duì)象
ds = DruidDataSourceFactory.createDataSource(pro);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 獲取連接池對(duì)象
*/
public static DataSource getDataSource(){
return ds;
}
/**
* 獲取連接connection對(duì)象
*/
public static Connection getConnection() throws SQLException {
return ds.getConnection();
}
}
創(chuàng)建我們的用戶類實(shí)體User
package cn.code.domain;
/*
用戶的實(shí)體類
*/
public class User {
private int id ;
private String username;
private String password;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
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;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", password='" + password + '\'' +
'}';
}
}
編寫Dao來操作數(shù)據(jù)庫,里面有l(wèi)ogin和add兩個(gè)方法 Userdao
package cn.code.dao;
import cn.code.domain.User;
import cn.code.util.JDBCUtils;
import org.springframework.dao.DataAccessException;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;
/**
* 操作數(shù)據(jù)庫中User表的類
*/
public class UserDao {
//聲明JDBCTemplate對(duì)象,以便方法公用
private JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());
/**
* 登錄方法
*
* @param loginUser 目前只有用戶名和密碼
* @return user包含用戶全部數(shù)據(jù)
*/
public User login(User loginUser) {
//編寫SQL
String sql = "select * from user where username = ? and password = ?";
//調(diào)用query方法
try {
User user = template.queryForObject(sql,
new BeanPropertyRowMapper<User>(User.class),
loginUser.getUsername(), loginUser.getPassword());
return user;
} catch (DataAccessException e) {
e.printStackTrace();
return null;
}
}
/**
* 注冊(cè)方法
*
* @param user 目前只包含用戶名和密碼
* @return 是否注冊(cè)成功
*/
public boolean add(User user){
//編寫SQL
String sql = "insert into user (username,password) VALUES('" + user.getUsername() + "','" + user.getPassword() + "')";
boolean flag = false;
int num = 0;
try {
//創(chuàng)建數(shù)據(jù)庫連接
Connection conn = JDBCUtils.getConnection();
Statement state = null;
flag = false;
num = 0;
state = conn.createStatement();
num = state.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
}
if(num >0) flag = true;
return flag;
}
}
登錄的Servlet
package cn.code.servlet;
import cn.code.dao.UserDao;
import cn.code.domain.User;
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 javax.servlet.http.HttpSession;
import java.io.IOException;
@WebServlet("/loginServlet")
public class LoginServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//設(shè)置字符編碼
request.setCharacterEncoding("utf-8");
//獲取參數(shù)
String username = request.getParameter("username");
String password = request.getParameter("password");
String checkcode = request.getParameter("checkcode");
//獲取生成的驗(yàn)證碼
HttpSession session = request.getSession();
String checkcode_session =(String) session.getAttribute("checkcode_session");
//防止驗(yàn)證碼存儲(chǔ) 刪除Session中存儲(chǔ)的驗(yàn)證碼
session.removeAttribute("checkcode_session");
//判斷驗(yàn)證碼是否正確
if(checkcode_session != null && checkcode_session.equalsIgnoreCase(checkcode)){
//equalsIgnoreCase忽略大小寫的比較
//驗(yàn)證碼正確
User loginUser = new User();
loginUser.setUsername(username);
loginUser.setPassword(password);
User user = new UserDao().login(loginUser);
if(user != null){
//用戶名以及密碼正確
//登錄成功
//存儲(chǔ)用戶信息
session.setAttribute("user",username); //因?yàn)槭莾纱握?qǐng)求,所以用Session
//重定向到success.jsp
response.sendRedirect(request.getContextPath()+"/success.jsp");
}else{
//用戶名及密碼錯(cuò)誤
//登錄失敗
//存儲(chǔ)提示信息到request
request.setAttribute("login_error","用戶名或密碼錯(cuò)誤");
//轉(zhuǎn)發(fā)到登錄頁面
request.getRequestDispatcher("/login.jsp").forward(request,response);
}
}else{
//驗(yàn)證碼不正確
//存儲(chǔ)提示信息到request
request.setAttribute("checkcode_error","驗(yàn)證碼錯(cuò)誤");
//轉(zhuǎn)發(fā)到登錄頁面
request.getRequestDispatcher("/login.jsp").forward(request,response);
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}
注冊(cè)的Servlet
package cn.code.servlet;
import cn.code.dao.UserDao;
import cn.code.domain.User;
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("/registerServlet")
public class RegisterServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
String username = request.getParameter("username");
String password = request.getParameter("password");
User registerUser = new User();
registerUser.setUsername(username);
registerUser.setPassword(password);
boolean flag = new UserDao().add(registerUser);
if(flag) {
request.setAttribute("register_success","注冊(cè)成功");
request.getRequestDispatcher("/register.jsp").forward(request,response);
}else{
request.setAttribute("register_error","賬號(hào)以被注冊(cè),注冊(cè)失敗");
request.getRequestDispatcher("/register.jsp").forward(request,response);
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request,response);
}
}
在頁面中畫驗(yàn)證碼(可點(diǎn)擊更換)Servlet
package cn.code.checkcode;
import javax.imageio.ImageIO;
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.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
//簡(jiǎn)易驗(yàn)證碼
@WebServlet("/checkCodeServlet")
public class CheckCodeServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
int width = 100;
int height = 50;
//創(chuàng)建一對(duì)象,在內(nèi)存中代表圖片(驗(yàn)證碼圖片對(duì)象)
BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_BGR);
//美化圖片
//填充背景色
Graphics g = image.getGraphics();//畫筆對(duì)象
g.setColor(Color.ORANGE);
g.fillRect(0,0,width,height);
//畫邊框
g.setColor(Color.BLUE);
g.drawRect(0,0,width-1,height-1);
String str = "QWERTYUIOPASDFGHJKLZXCVBNM1234567890zxcvbnmlkjhgfdsaqwertyuiop";
//生成隨機(jī)角標(biāo)
StringBuilder sb = new StringBuilder();
Random ran = new Random();
for (int i = 1; i <= 4; i++) {
int index = ran.nextInt(str.length());
//獲取字符
char ch = str.charAt(index);
sb.append(ch);
//寫驗(yàn)證碼
g.drawString(ch+"",width/5*i,height/2);
}
String checkcode_session = sb.toString();
//將驗(yàn)證碼存入session
request.getSession().setAttribute("checkcode_session",checkcode_session);
//畫干擾線
g.setColor(Color.RED);
//隨機(jī)生成坐標(biāo)點(diǎn)
for (int i = 0 ;i<6;i++) {
int x1 = ran.nextInt(width);
int x2 = ran.nextInt(width);
int y1 = ran.nextInt(height);
int y2 = ran.nextInt(height);
g.drawLine(x1,y1,x2,y2);
}
//將圖片輸出到頁面展示
ImageIO.write(image, "jpg", response.getOutputStream());
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}
到此這篇關(guān)于JavaWeb簡(jiǎn)單用戶登錄注冊(cè)實(shí)例代碼(有驗(yàn)證碼)的文章就介紹到這了,更多相關(guān)JavaWeb 用戶登錄注冊(cè)內(nèi)容請(qǐng)搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家!
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