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這篇文章主要為大家展示了“JavaWeb如何實現用戶登錄注冊”，內容簡而易懂，條理清晰，希望能夠幫助大家解決疑惑，下面讓小編帶領大家一起研究并學習一下“JavaWeb如何實現用戶登錄注冊”這篇文章吧。
需求
編寫login登錄界面(用戶名，密碼，驗證碼，登陸按鈕，注冊按鈕)
設計關系數據庫(編號，用戶名，密碼)
編寫注冊功能，將數據存儲在數據庫中。（姓名不能重復，設為主鍵，重復會注冊失敗）
編寫登錄功能 。首先獲取驗證碼，先判斷驗證碼是否正確，不正確則顯示驗證碼錯誤。驗證碼正確后再獲取用戶名和密碼，進行數據庫的搜索比對，若正確則重定向到成功的界面，并且將用戶名顯示。
jar包
技術選型
Servlet + JSP + Mysql + JDBCTemplate + Druid + BeanUtils + Tomcat
效果圖
驗證碼或者用戶名和密碼錯誤
Navicat Premium 顯示Mysql內容
登錄成功
注冊功能
源碼
登錄主界面 login.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Login</title>
<script>
<%-- 增加時間戳來更換驗證碼圖片 --%>
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" onclick="reg()" ></td>
</tr>
</table>
</form>
<div>${requestScope.login_error}</div>
<div>${requestScope.checkcode_error}</div>
</body>
</html>注冊界面 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"></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>
<%-- <h2>${requestScope.user},歡迎您</h2> --%>
<h2><%=request.getSession().getAttribute("user")%>,歡迎您</h2>
</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，獲取字節輸入流
InputStream is = JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties");
pro.load(is);
//初始化連接池對象
ds = DruidDataSourceFactory.createDataSource(pro);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 獲取連接池對象
*/
public static DataSource getDataSource(){
return ds;
}
/**
* 獲取連接connection對象
*/
public static Connection getConnection() throws SQLException {
return ds.getConnection();
}
}創建我們的用戶類實體User
package cn.code.domain;
/*
用戶的實體類
*/
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來操作數據庫，里面有login和add兩個方法 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;
/**
* 操作數據庫中User表的類
*/
public class UserDao {
//聲明JDBCTemplate對象，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包含用戶全部數據
*/
public User login(User loginUser) {
//編寫SQL
String sql = "select * from user where username = ? and password = ?";
//調用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;
}
}
/**
* 注冊方法
*
* @param user 目前只包含用戶名和密碼
* @return 是否注冊成功
*/
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 {
//創建數據庫連接
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 {
//設置字符編碼
request.setCharacterEncoding("utf-8");
//獲取參數
String username = request.getParameter("username");
String password = request.getParameter("password");
String checkcode = request.getParameter("checkcode");
//獲取生成的驗證碼
HttpSession session = request.getSession();
String checkcode_session =(String) session.getAttribute("checkcode_session");
//防止驗證碼存儲 刪除Session中存儲的驗證碼
session.removeAttribute("checkcode_session");
//判斷驗證碼是否正確
if(checkcode_session != null && checkcode_session.equalsIgnoreCase(checkcode)){
//equalsIgnoreCase忽略大小寫的比較
//驗證碼正確
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
//存儲用戶信息
session.setAttribute("user",username); //因為是兩次請求，所以用Session
//重定向到success.jsp
response.sendRedirect(request.getContextPath()+"/success.jsp");
}else{
//用戶名及密碼錯誤
//登錄失敗
//存儲提示信息到request
request.setAttribute("login_error","用戶名或密碼錯誤");
//轉發到登錄頁面
request.getRequestDispatcher("/login.jsp").forward(request,response);
}
}else{
//驗證碼不正確
//存儲提示信息到request
request.setAttribute("checkcode_error","驗證碼錯誤");
//轉發到登錄頁面
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","注冊成功");
request.getRequestDispatcher("/register.jsp").forward(request,response);
}else{
request.setAttribute("register_error","賬號以被注冊,注冊失敗");
request.getRequestDispatcher("/register.jsp").forward(request,response);
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request,response);
}
}在頁面中畫驗證碼（可點擊更換）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;
//簡易驗證碼
@WebServlet("/checkCodeServlet")
public class CheckCodeServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
int width = 100;
int height = 50;
//創建一對象，在內存中代表圖片（驗證碼圖片對象）
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";
//生成隨機角標
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);
//寫驗證碼
g.drawString(ch+"",width/5*i,height/2);
}
String checkcode_session = sb.toString();
//將驗證碼存入session
request.getSession().setAttribute("checkcode_session",checkcode_session);
//畫干擾線
g.setColor(Color.RED);
//隨機生成坐標點
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);
}
}以上是“JavaWeb如何實現用戶登錄注冊”這篇文章的所有內容，感謝各位的閱讀！相信大家都有了一定的了解，希望分享的內容對大家有所幫助，如果還想學習更多知識，歡迎關注億速云行業資訊頻道！
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