java登录源代码 java编程实现登录

java编写一个登陆和注册信息的源代码,最简单的就可以,不需要数据库的那种

你这个不用数据库真的是有点难搞

我写了个用集合存储的，你看看，能否帮上你

java.util.ListString list = new ArrayListString();

  list.add("qq=123");//存储的时候用（用户名=密码）的形式

  list.add("ww=456");

  

  String username = "qq";

  String password = "123";

  for (int i = 0; i  list.size(); i++) {

   String num = username +"="+password;

   if(num.equals(list.get(i))){

    System.out.println("登录成功");

    break;

   }

  }

相关问答

Q1: java登陆界面源代码是个类文件，怎样运行文件？

下载jdk并安装，之后设置下环境变量。然后直接在命令行运行就可以了（用命令java *(*代表类名)）

Q2: jsp登陆界面源代码

1、login.jsp文件

%@ page language="java" contentType="text/html; charset=GB18030"

pageEncoding="GB18030"%

%@ page import="java.util.*" %

!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"

html

head

title登录页面/title

/head

body

form name="loginForm" method="post" action="judgeUser.jsp"

table

tr

td用户名:input type="text" name="userName" id="userName"/td

/tr

tr

td密码:input type="password" name="password" id="password"/td

/tr

tr

tdinput type="submit" value="登录" style="background-color:pink" input

type="reset" value="重置" style="background-color:red"/td

/tr

/table

/form

/body

/html

2、judge.jsp文件

%@ page language="java" contentType="text/html; charset=GB18030"

pageEncoding="GB18030"%

%@ page import="java.util.*" %

!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"

html

head

title身份验证/title

/head

body

%

request.setCharacterEncoding("GB18030");

String name = request.getParameter("userName");

String password = request.getParameter("password");

if(name.equals("abc") password.equals("123")) {

3、afterLogin.jsp文件

%

jsp:forward page="afterLogin.jsp"

jsp:param name="userName" value="%=name%"/

/jsp:forward

%

}

else {

%

jsp:forward page="login.jsp"/

%

}

%

/body

/html

%@ page language="java" contentType="text/html; charset=GB18030"

pageEncoding="GB18030"%

!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"

html

head

title登录成功/title

/head

body

%

request.setCharacterEncoding("GB18030");

String name = request.getParameter("userName");

out.println("欢迎你:" + name);

%

/body

/html

扩展资料：

java web登录界面源代码：

1、Data_uil.java文件

import java.sql.*;

public class Data_uil

{

public  Connection getConnection()

{

try{

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

}catch(ClassNotFoundException e)

{

e.printStackTrace();

}

String user="***";

String password="***";

String url="jdbc:sqlserver://127.0.0.1:1433;DatabaseName=***";

Connection con=null;

try{

con=DriverManager.getConnection(url,user,password);

}catch(SQLException e)

{

e.printStackTrace();

}

return con;

}

public  String selectPassword(String username)

{

Connection connection=getConnection();

String sql="select *from login where username=?";

PreparedStatement preparedStatement=null;

ResultSet result=null;

String password=null;

try{

preparedStatement=connection.prepareStatement(sql);

preparedStatement.setString(1,username);

result=preparedStatement.executeQuery();//可执行的     查询

if(result.next())

password=result.getString("password");

}catch(SQLException e){

e.printStackTrace();

}finally

{

close(preparedStatement);

close(result);

close(connection);

}

System.out.println("找到的数据库密码为："+password);

return password; 

}

public  void close (Connection con)

{

try{

if(con!=null)

{

con.close();

}

}catch(SQLException e)

{

e.printStackTrace();

}

}

public  void close (PreparedStatement preparedStatement)

{

try{

if(preparedStatement!=null)

{

preparedStatement.close();

}

}catch(SQLException e)

{

e.printStackTrace();

}

}

public  void close(ResultSet resultSet)

{

try{

if(resultSet!=null)

{

resultSet.close();

}

}catch(SQLException e)

{

e.printStackTrace();

}

}

}

2、login_check.jsp:文件

%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8"%

!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" ""

html

head

meta http-equiv="Content-Type" content="text/html; charset=utf-8"

title验证用户密码/title

/head

body

jsp:useBean id="util" class="util.Data_uil" scope="page" /

%

String username=(String)request.getParameter("username");

String password=(String)request.getParameter("password");

if(username==null||"".equals(username))

{

out.print("script language='javaScript' alert('用户名不能为空');/script");

response.setHeader("refresh", "0;url=user_login.jsp");

}

else

{

System.out.println("输入的用户名:"+username);

String passwordInDataBase=util.selectPassword(username);

System.out.println("密码："+passwordInDataBase);

if(passwordInDataBase==null||"".equals(passwordInDataBase))

{

out.print("script language='javaScript' alert('用户名不存在');/script");

response.setHeader("refresh", "0;url=user_login.jsp");

}

else if(passwordInDataBase.equals(password))

{

out.print("script language='javaScript' alert('登录成功');/script");

response.setHeader("refresh", "0;url=loginSucces.jsp");

}

else

{

out.print("script language='javaScript' alert('密码错误');/script");

response.setHeader("refresh", "0;url=user_login.jsp");

}

}

%

/body

/html

3、loginSucces.jsp文件

%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8"%

!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" ""

html

head

meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"

titleInsert title here/title

/head

body

hr size="10" width="26%" align="left" color="green"

font size="6" color="red" 登录成功 /font

hr size="10" width="26%" align="left" color="green"

/body

/html

4、user_login.jsp文件

%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8"%

!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" ""

html

head

meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"

title登录界面/title

/head

body  background="C:\Users\win8\workspace\Login\image\9dcbdc339e72a5663b5c289fb5573c13_10.jpg"

center

brbrbrbrbrbr

h1 style="color:yellow"Login/h1

br

form name="loginForm" action="login_check.jsp" method="post" 

table Border="0"

tr

td账号/td

tdinput type="text" name="username"/td

/tr

tr

td密码/td

tdinput type="password" name="password"

/td

/tr

/table

br

input type="submit" value="登录" style="color:#BC8F8F"

/form

/center

/body

/html

Q3: JAVA中GUI登录界面设计源代码是什么？

import java.awt.BorderLayout;

import java.awt.Container;

import java.awt.FlowLayout;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JPasswordField;

import javax.swing.JTextField;

public class Login {

private JFrame frame = new JFrame("登录");

private Container c = frame.getContentPane();

private JTextField username = new JTextField();

private JPasswordField password = new JPasswordField();

private JButton ok = new JButton("确定");

private JButton cancel = new JButton("取消");

public Login(){

frame.setSize(300,200);

c.setLayout(new BorderLayout());

initFrame();

frame.setVisible(true);

}

private void initFrame() {

//顶部

JPanel titlePanel = new JPanel();

titlePanel.setLayout(new FlowLayout());

titlePanel.add(new JLabel("系统管理员登录"));

c.add(titlePanel,"North");

//中部表单

JPanel fieldPanel = new JPanel();

fieldPanel.setLayout(null);

JLabel l1 = new JLabel("用户名:");

l1.setBounds(50, 20, 50, 20);

JLabel l2 = new JLabel("密 码:");

l2.setBounds(50, 60, 50, 20);

fieldPanel.add(l1);

fieldPanel.add(l2);

username.setBounds(110,20,120,20);

password.setBounds(110,60,120,20);

fieldPanel.add(username);

fieldPanel.add(password);

c.add(fieldPanel,"Center");

//底部按钮

JPanel buttonPanel = new JPanel();

buttonPanel.setLayout(new FlowLayout());

buttonPanel.add(ok);

buttonPanel.add(cancel);

c.add(buttonPanel,"South");

}

public static void main(String[] args){

new Login();

}

}

Q4: Java源代码：超市会员注册、登录、修改、删除

如果界面做好之后需要填充如下逻辑：

系统应用到的数据表的建立和Dao的操作封装，小系统建议使用jdbc；

在相应的界面事件监听中编写处理数据的逻辑，将需要显示的数据显示出来；

虽然业务不是很复杂，也涉及到了角色，权限，对数据库的增删改查等等，建议先把业务逻辑理清在写程序，会简单很多

java登录源代码的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于java编程实现登录、java登录源代码的信息别忘了在本站进行查找喔。