JavaWeb简单用户登录注册实例代码(有验证码)

2023-07-31 13:35:03 83

需求

编写login登录界面(用户名，密码，验证码，登陆按钮，注册按钮)
设计关系数据库(编号，用户名，密码)
编写注册功能，将数据存储在数据库中。（姓名不能重复，设为主键，重复会注册失败）
编写登录功能。首先获取验证码，先判断验证码是否正确，不正确则显示验证码错误。验证码正确后再获取用户名和密码，进行数据库的搜索比对，若正确则重定向到成功的界面，并且将用户名显示。

jar包

技术选型
Servlet+JSP+Mysql+JDBCTemplate+Druid+BeanUtils+Tomcat

效果图

验证码或者用户名和密码错误

NavicatPremium显示Mysql内容

登录成功

注册功能

源码

登录主界面login.jsp

<%@pagecontentType="text/html;charset=UTF-8"language="java"%>


Login










用户名



密码



验证码












${requestScope.login_error}
${requestScope.checkcode_error}

注册界面register.jsp

<%@pagecontentType="text/html;charset=UTF-8"language="java"%>


Title





用户名



密码







${requestScope.register_success}
${requestScope.register_error}

成功界面success.jsp

<%@pagecontentType="text/html;charset=UTF-8"language="java"%>


Title


<%--${requestScope.user},欢迎您--%>
<%=request.getSession().getAttribute("user")%>,欢迎您

先编辑好JDBCUtils工具类

packagecn.code.util;

importcom.alibaba.druid.pool.DruidDataSourceFactory;

importjavax.sql.DataSource;
importjava.io.IOException;
importjava.io.InputStream;
importjava.sql.Connection;
importjava.sql.SQLException;
importjava.util.Properties;

/**
*JDBC工具类使用Durid连接池
*/
publicclassJDBCUtils{

privatestaticDataSourceds;

static{
try{
//加载配置文件
Propertiespro=newProperties();
//使用ClassLoader加载配置文件，获取字节输入流
InputStreamis=JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties");
pro.load(is);

//初始化连接池对象
ds=DruidDataSourceFactory.createDataSource(pro);
}catch(Exceptione){
e.printStackTrace();
}


}

/**
*获取连接池对象
*/
publicstaticDataSourcegetDataSource(){
returnds;
}
/**
*获取连接connection对象
*/
publicstaticConnectiongetConnection()throwsSQLException{
returnds.getConnection();
}
}

创建我们的用户类实体User

packagecn.code.domain;

/*
用户的实体类
*/

publicclassUser{
privateintid;
privateStringusername;
privateStringpassword;

publicintgetId(){
returnid;
}

publicvoidsetId(intid){
this.id=id;
}

publicStringgetUsername(){
returnusername;
}

publicvoidsetUsername(Stringusername){
this.username=username;
}

publicStringgetPassword(){
returnpassword;
}

publicvoidsetPassword(Stringpassword){
this.password=password;
}

@Override
publicStringtoString(){
return"User{"+
"id="+id+
",username='"+username+'\''+
",password='"+password+'\''+
'}';
}
}

编写Dao来操作数据库，里面有login和add两个方法Userdao

packagecn.code.dao;

importcn.code.domain.User;
importcn.code.util.JDBCUtils;
importorg.springframework.dao.DataAccessException;
importorg.springframework.jdbc.core.BeanPropertyRowMapper;
importorg.springframework.jdbc.core.JdbcTemplate;

importjava.sql.Connection;
importjava.sql.SQLException;
importjava.sql.Statement;

/**
*操作数据库中User表的类
*/
publicclassUserDao{

//声明JDBCTemplate对象，以便方法公用
privateJdbcTemplatetemplate=newJdbcTemplate(JDBCUtils.getDataSource());

/**
*登录方法
*
*@paramloginUser目前只有用户名和密码
*@returnuser包含用户全部数据
*/
publicUserlogin(UserloginUser){
//编写SQL
Stringsql="select*fromuserwhereusername=?andpassword=?";
//调用query方法
try{
Useruser=template.queryForObject(sql,
newBeanPropertyRowMapper(User.class),
loginUser.getUsername(),loginUser.getPassword());
returnuser;
}catch(DataAccessExceptione){
e.printStackTrace();
returnnull;
}
}

/**
*注册方法
*
*@paramuser目前只包含用户名和密码
*@return是否注册成功
*/
publicbooleanadd(Useruser){
//编写SQL
Stringsql="insertintouser(username,password)VALUES('"+user.getUsername()+"','"+user.getPassword()+"')";
booleanflag=false;
intnum=0;
try{
//创建数据库连接
Connectionconn=JDBCUtils.getConnection();
Statementstate=null;
flag=false;
num=0;

state=conn.createStatement();
num=state.executeUpdate(sql);
}catch(SQLExceptione){
e.printStackTrace();
}

if(num>0)flag=true;
returnflag;
}
}

登录的Servlet

packagecn.code.servlet;

importcn.code.dao.UserDao;
importcn.code.domain.User;

importjavax.servlet.ServletException;
importjavax.servlet.annotation.WebServlet;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importjavax.servlet.http.HttpSession;
importjava.io.IOException;

@WebServlet("/loginServlet")
publicclassLoginServletextendsHttpServlet{
protectedvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{
//设置字符编码
request.setCharacterEncoding("utf-8");
//获取参数
Stringusername=request.getParameter("username");
Stringpassword=request.getParameter("password");
Stringcheckcode=request.getParameter("checkcode");
//获取生成的验证码
HttpSessionsession=request.getSession();
Stringcheckcode_session=(String)session.getAttribute("checkcode_session");
//防止验证码存储删除Session中存储的验证码
session.removeAttribute("checkcode_session");

//判断验证码是否正确
if(checkcode_session!=null&&checkcode_session.equalsIgnoreCase(checkcode)){
//equalsIgnoreCase忽略大小写的比较
//验证码正确
UserloginUser=newUser();
loginUser.setUsername(username);
loginUser.setPassword(password);
Useruser=newUserDao().login(loginUser);

if(user!=null){
//用户名以及密码正确
//登录成功
//存储用户信息
session.setAttribute("user",username);//因为是两次请求，所以用Session
//重定向到success.jsp
response.sendRedirect(request.getContextPath()+"/success.jsp");
}else{
//用户名及密码错误
//登录失败
//存储提示信息到request
request.setAttribute("login_error","用户名或密码错误");
//转发到登录页面
request.getRequestDispatcher("/login.jsp").forward(request,response);
}
}else{
//验证码不正确
//存储提示信息到request
request.setAttribute("checkcode_error","验证码错误");
//转发到登录页面
request.getRequestDispatcher("/login.jsp").forward(request,response);
}

}

protectedvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{
this.doPost(request,response);
}
}

注册的Servlet

packagecn.code.servlet;

importcn.code.dao.UserDao;
importcn.code.domain.User;

importjavax.servlet.ServletException;
importjavax.servlet.annotation.WebServlet;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importjava.io.IOException;

@WebServlet("/registerServlet")
publicclassRegisterServletextendsHttpServlet{
protectedvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{
request.setCharacterEncoding("utf-8");

Stringusername=request.getParameter("username");
Stringpassword=request.getParameter("password");

UserregisterUser=newUser();
registerUser.setUsername(username);
registerUser.setPassword(password);
booleanflag=newUserDao().add(registerUser);
if(flag){
request.setAttribute("register_success","注册成功");
request.getRequestDispatcher("/register.jsp").forward(request,response);
}else{
request.setAttribute("register_error","账号以被注册,注册失败");
request.getRequestDispatcher("/register.jsp").forward(request,response);
}

}

protectedvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{
this.doPost(request,response);
}
}

在页面中画验证码（可点击更换）Servlet

packagecn.code.checkcode;

importjavax.imageio.ImageIO;
importjavax.servlet.ServletException;
importjavax.servlet.annotation.WebServlet;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importjava.awt.*;
importjava.awt.image.BufferedImage;
importjava.io.IOException;
importjava.util.Random;

//简易验证码
@WebServlet("/checkCodeServlet")
publicclassCheckCodeServletextendsHttpServlet{
protectedvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{
intwidth=100;
intheight=50;
//创建一对象，在内存中代表图片（验证码图片对象）
BufferedImageimage=newBufferedImage(width,height,BufferedImage.TYPE_INT_BGR);

//美化图片
//填充背景色
Graphicsg=image.getGraphics();//画笔对象
g.setColor(Color.ORANGE);
g.fillRect(0,0,width,height);
//画边框
g.setColor(Color.BLUE);
g.drawRect(0,0,width-1,height-1);

Stringstr="QWERTYUIOPASDFGHJKLZXCVBNM1234567890zxcvbnmlkjhgfdsaqwertyuiop";

//生成随机角标
StringBuildersb=newStringBuilder();
Randomran=newRandom();
for(inti=1;i<=4;i++){
intindex=ran.nextInt(str.length());
//获取字符
charch=str.charAt(index);
sb.append(ch);
//写验证码
g.drawString(ch+"",width/5*i,height/2);
}
Stringcheckcode_session=sb.toString();
//将验证码存入session
request.getSession().setAttribute("checkcode_session",checkcode_session);

//画干扰线
g.setColor(Color.RED);
//随机生成坐标点
for(inti=0;i<6;i++){
intx1=ran.nextInt(width);
intx2=ran.nextInt(width);
inty1=ran.nextInt(height);
inty2=ran.nextInt(height);
g.drawLine(x1,y1,x2,y2);
}
//将图片输出到页面展示
ImageIO.write(image,"jpg",response.getOutputStream());
}

protectedvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{
this.doPost(request,response);
}
}

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JavaWeb简单用户登录注册实例代码(有验证码)

${requestScope.user},欢迎您

<%=request.getSession().getAttribute("user")%>,欢迎您

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