java用户登录代码
⑴ 登录界面的java代码，分别有教师登录，管理员登录，学生登录，右边是用户名和密码，见图。
分三个包，自己建个包，导进去就ok了，数据库是access的。
package 登录;
import java.awt.EventQueue;
public class Cilent {
private JFrame frame;
private JTextField textField;
private JPasswordField passwordField;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Cilent window = new Cilent();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public Cilent() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setTitle("登陆界面");
frame.setBounds(100, 100, 450, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
frame.setResizable(false);
JLabel lblNewLabel = new JLabel("用户名");
lblNewLabel.setBounds(38, 43, 80, 34);
frame.getContentPane().add(lblNewLabel);
textField = new JTextField();
textField.setBounds(155, 42, 227, 37);
frame.getContentPane().add(textField);
textField.setColumns(10);
JLabel label = new JLabel("密码");
label.setBounds(38, 115, 80, 34);
frame.getContentPane().add(label);
passwordField = new JPasswordField();
passwordField.setBounds(155, 115, 227, 37);
frame.getContentPane().add(passwordField);
JButton btnNewButton = new JButton("登录");
btnNewButton.setBounds(60, 187, 115, 34);
frame.getContentPane().add(btnNewButton);
btnNewButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
UserCheck UC=new UserCheck(textField.getText(),String.valueOf(passwordField.getPassword()));
if(UC.getI()!=0) //有此用户
{
frame.setVisible(false);
}
else
{
textField.setText("");
passwordField.setText("");
}
}
});
JButton button = new JButton("取消");
button.setBounds(242, 187, 115, 34);
frame.getContentPane().add(button);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
textField.setText("");
passwordField.setText("");
}
});
}
}
/*****************************************************************/
package 登录;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import 操作处理.UsersCL;
/**@author 20111024
* 检测登录的用户在数据库中有无，若没有，则提示没有此用户，
* 若有，则判断级别：普通用户还是管理员。
*/
public class UserCheck {
private int i=0; //用户级别:0不是用户、1是管理员、2是普通用户
UserCheck(String name ,String password)
{
String jdriver="sun.jdbc.odbc.JdbcOdbcDriver";
String connectDB="jdbc:odbc:Students";
Statement stmt=null;
ResultSet rs=null;
Connection con=null;
try {
Class.forName(jdriver);
con=DriverManager.getConnection(connectDB);
stmt=con.createStatement();
String query="select * from users where name='"+name+"' and passwd='"+password+"'";
rs=stmt.executeQuery(query);
if(rs.next())
{
//数据库中有此用户，访问成功
i=Integer.parseInt(rs.getString(3));
UsersCL UL=new UsersCL(i);
}
else
{
i=0; //没有用户是默认是0级
}
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public int getI() {
return i;
}
}
/********************************************************************************************/
package 操作处理;
import java.awt.EventQueue;
public class UsersCL implements ActionListener{
private JFrame frame;
private JTextField textField;
private JTextField textField_1;
private JTextField textField_2;
private JTextField textField_3;
private int i=0;
private JLabel label_3;
private JTextField textField_4;
public UsersCL(int i) {
this.i=i;
frame = new JFrame();
frame.setTitle("用户处理界面");
frame.setBounds(100, 100, 450, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
frame.setResizable(false);
frame.setVisible(true);
JLabel lblNewLabel = new JLabel("学号");
lblNewLabel.setBounds(24, 32, 74, 29);
frame.getContentPane().add(lblNewLabel);
JLabel label = new JLabel("姓名");
label.setBounds(24, 71, 74, 29);
frame.getContentPane().add(label);
JLabel label_1 = new JLabel("年龄");
label_1.setBounds(24, 110, 74, 29);
frame.getContentPane().add(label_1);
label_3 = new JLabel("性别");
label_3.setBounds(24, 149, 74, 29);
frame.getContentPane().add(label_3);
JLabel label_2 = new JLabel("状态");
label_2.setBounds(24, 195, 74, 29);
frame.getContentPane().add(label_2);
textField = new JTextField();
textField.setBounds(101, 34, 113, 25);
frame.getContentPane().add(textField);
textField.setColumns(10);
textField_1 = new JTextField();
textField_1.setColumns(10);
textField_1.setBounds(101, 73, 113, 25);
frame.getContentPane().add(textField_1);
textField_2 = new JTextField();
textField_2.setColumns(10);
textField_2.setBounds(101, 112, 113, 25);
frame.getContentPane().add(textField_2);
textField_3 = new JTextField();
textField_3.setEditable(false);
textField_3.setColumns(10);
textField_3.setBounds(101, 199, 288, 25);
frame.getContentPane().add(textField_3);
textField_4 = new JTextField();
textField_4.setColumns(10);
textField_4.setBounds(101, 149, 113, 25);
frame.getContentPane().add(textField_4);
if(1==i)
{
JButton btnNewButton = new JButton("追加");
btnNewButton.setBounds(276, 41, 113, 29);
frame.getContentPane().add(btnNewButton);
btnNewButton.addActionListener(this);
btnNewButton.setActionCommand("追加");
JButton button_1 = new JButton("删除");
button_1.setBounds(276, 145, 113, 29);
frame.getContentPane().add(button_1);
button_1.addActionListener(this);
button_1.setActionCommand("删除");
}
JButton button = new JButton("查询");
button.setBounds(276, 91, 113, 29);
frame.getContentPane().add(button);
button.addActionListener(this);
button.setActionCommand("查询");
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
String name,age,sex,query=null;
int num,age1,count=0;
num=Integer.parseInt(textField.getText());
name=textField_1.getText();
age1=Integer.parseInt(textField_2.getText());
sex=textField_4.getText();
if(e.getActionCommand().equals("追加"))
{
query="insert into students values("+num+","+"'"+name+"',"+age1+",'"+sex+"');";
count=1;
}
else if(e.getActionCommand().equals("查询"))
{
query="select * from students where XSB="+num+";";
count=2;
}
else if(e.getActionCommand().equals("删除"))
{
query="delete from students where XSB="+num+" and name="+"'"+name+"'";
count=3;
}
Statement stmt=null;
ResultSet rs=null;
Connection con=null;
String jdriver="sun.jdbc.odbc.JdbcOdbcDriver";
String connectDB="jdbc:odbc:Students";
String query1=null;
try {
Class.forName(jdriver);
con=DriverManager.getConnection(connectDB);
stmt=con.createStatement();
if(count==1)
{
query1="select * from students where XSB="+num+";";
rs=stmt.executeQuery(query1);
if(rs.next())
textField_3.setText("已经由此记录，不能追加！");
else
{
stmt.executeUpdate(query);
textField_3.setText("已经追加完成！");
}
}
else if(2==count)
{
stmt.executeQuery(query);
rs=stmt.executeQuery(query);
if(rs.next())
{
textField_3.setText("已查找到此记录！");
}
else
{
textField_3.setText("没有此记录，可以追加！");
}
}
else if(3==count)
{
query1="select * from students where XSB="+num+" and name="+"'"+name+"'";
rs=stmt.executeQuery(query1);
if(rs.next())
{
stmt.executeUpdate(query);
textField_3.setText("已删除此记录！");
}
else
textField_3.setText("无此记录！");
}
} catch (ClassNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
finally{
//关闭资源
if(stmt!=null){
try {
stmt.close();
} catch (Exception e2) {
// TODO: handle exception
}
stmt=null;
}
if(con!=null){
try {
con.close();
} catch (Exception e2) {
// TODO: handle exception
}
con=null;
}
}
}
}
⑵ 用JAVA编写一个用户或注册登录界面。请哪位高手能够写下具体的代码，谢谢
效果图
<!DOCTYPEhtml>
<html>
<head>
<metacharset="UTF-8">
<title>先锋图书馆管理系统-登录</title>
<style>
*{
margin:0;
padding:0;
list-style:none;
}
#top{
width:1000px;
height:95px;
margin:0auto;
margin-top:25px;
}
#top_top{
width:1000px;
height:65px;
background:deepskyblue;
}
#top_top_left{
width:300px;
height:65px;
float:left;
}
#top_top_left>label{
width:200px;
height:65px;
color:white;
float:right;
}
#top_top_left>#a2{
padding-left:10px;
padding-top:20px;
font-size:16px;
}
#top_bottom{
width:1000px;
height:30px;
}
#top_bottom_left{
width:340px;
height:30px;
line-height:30px;
font-size:12px;
background:skyblue;
color:white;
text-indent:2em;
float:left;
}
#top_bottom_right{
width:660px;
height:30px;
line-height:30px;
font-size:12px;
color:blueviolet;
text-align:center;
float:right;
background:lightskyblue;
}
#content{
width:1000px;
height:600px;
margin:0auto;
background:#587FBA;
}
#content>#text{
width:1000px;
height:50px;
line-height:50px;
padding-top:100px;
font-size:36px;
font-family:"楷体";
font-weight:bold;
text-align:center;
}
#content>#login{
width:480px;
height:210px;
margin-top:20px;
margin-left:260px;
background:#85A0CB;
}
#content>#login>img{
float:left;
}
#content>#login>#select{
width:305px;
height:210px;
float:right;
}
#content>#login>#select>div{
width:230;
height:30px;
margin-left:30px;
}
#content>#login>#select>#d1{
margin-top:30px;
margin-bottom:3px;
}
#content>#login>#select>p{
font-size:14px;
margin-left:95px;
}
#bottom{
width:1000px;
height:35px;
line-height:35px;
margin:0auto;
background:deepskyblue;
text-align:center;
color:white;
}
</style>
</head>
<body>
<divid="top">
<divid="top_top">
<divid="top_top_left">
<imgsrc="img/test/a13.png"width="78px"height="65px"><labelid="a2">先锋图书馆系统管理平台</label>
</div>
</div>
<divid="top_bottom">
<divid="top_bottom_left">当前位置:首页>系统管理>登录</div>
<divid="top_bottom_right">当前时间:<labelid="lable"></label></div>
</div>
</div>
<divid="content">
<divid="text">欢迎登录先锋图书馆管理系统</div>
<divid="login">
<imgsrc="img/test/a14.png"width="175px"height="210px"/>
<formid="select">
<divid="d1">用户名: <inputtype="text"/></div>
<div>密 码: <inputtype="password"/></div>
<p>
<inputtype="radio"name="user"value="read"/>读者
<inputtype="radio"name="user"value="admin"/>管理员
</p><br/>
<p>
<inputtype="button"value="确定"style="width:50px;"onclick="put()"/>
<inputtype="reset"value="重置"style="width:50px;"/>
</p>
</form>
</div>
</div>
<divid="bottom">欣欣科技有限公司版权所有</div>
</body>
<scripttype="text/javascript"src="JQuery/jquery.js"></script>
<scripttype="text/javascript"src="js/GetCurrentTime.js"></script>
<script>
//验证用户名和密码
functionput(){
vard=$("#select>div>input");//获取用户名和密码
varname=d[0].value;
varpass=d[1].value;
varuser=null;
varr=document.getElementsByName("user");//获取用户类型
for(i=0;i<r.length;i++){
if(r[i].checked){
user=r[i].value;
}
}
//console.log(name+","+pass+","+user);//输出测试
if(user==null){
window.alert("请选择用户类型!");
}elseif(user=="admin"&&name!="admin"){
window.alter("用户名错误!");
}elseif(user=="admin"&&name=="admin"&&pass!="123456"){
window.alert("密码错误!");
}elseif(name=="admin"&&pass=="123456"&&user=="admin"){
window.location.href="work_02_welcome.html";//在js中在本页面中打开新链接
}else{
window.alert("用户名错误");
}
}
</script>
</html>
⑶ 求JAVA实现用户登录界面代码
求麦克实现登录用户密码，电费就点击x加y就可以了。
⑷ 用Java编写注册登录程序
什么都不说了 直接给你代码吧
package com.moliying.ui;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.List;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedWriter;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.Arrays;
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);
frame.setBounds(450, 300, 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 a1 = new JLabel("用户名:");
a1.setBounds(50, 20, 50, 20);
JLabel a2 = new JLabel("密 码:");
a2.setBounds(50, 60, 50, 20);
fieldPanel.add(a1);
fieldPanel.add(a2);
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");
ok.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println(username.getText().toString());
}
});
cancel.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
frame.setVisible(false);
}
});
}
public static void main(String[] args) {
// new Login();
String ss = "abbabbbaabbbccba";
System.out.println(ss.split("b").length);
}
}
⑸ java写的用户登陆实例，用eclipse开发的具体步奏和代码
java写的用户登录实例，实际页面展示使用的jsp，那么下面是jsp的登录页面代码：
1、login.jsp代码
<%
string name = request.getparameter("username");
string pwd = request.getparameter("password");
//out.println(name+pwd);
string sql ="select * from info where username='"+name+"' and password='"+pwd+"'";
//out.println(sql);
statement stm= null;
resultset rs =null;
try
{
stm = conn.createstatement();
rs = stm.executequery(sql);
if(rs.next())
{
session.setattribute("username",name);
response.sendredirect("index.html");
}
else
{
response.sendredirect("index1.html");
}
}
catch(sqlexception e)
{
e.printstacktrace();
}
%>
<!--登录的表单-->
<form name="form1" method="post" action="login.jsp">
<p>
<label for="username"></label> 用户名
<input type="text" name="username" id="username">
</p>
<p>
<label for="passwrod"></label> 密码
<input type="text" name="passwrod" id="passwrod">
</p>
<p>
<input type="submit" name="button" id="button" value="提交">
</p>
</form>
2、用户信息表，存放用户名和密码：
user_info 表
create table if not exists `test` (
`id` int(8) not null auto_increment,
`username` char(150) default null,
`password` varchar(32),
`times` int(4) not null,
primary key (`id`)
) engine=myisam default charset=utf8 auto_increment=1 ;
⑹ 求一个用Java写的登陆界面的源代码，输入用户名，密码，登录后显示欢迎登录，加分
这个是我之前做着玩的，只做了个登录，不要介意，登录名：admin，密码：admin。
⑺ 用java写一个登陆界面代码。
概述
具体框架使用jframe，文本框组件：JTextField；密码框组件：JPasswordField；标签组件：JLabel；复选框组件：JCheckBox；单选框组件：JRadioButton；按钮组件JButton。
登录界面：
Swing 是一个为Java设计的GUI工具包。
Swing是JAVA基础类的一部分。
Swing包括了图形用户界面（GUI）器件如：文本框，按钮，分隔窗格和表。
Swing提供许多比AWT更好的屏幕显示元素。它们用纯Java写成，所以同Java本身一样可以跨平台运行，这一点不像AWT。它们是JFC的一部分。它们支持可更换的面板和主题（各种操作系统默认的特有主题），然而不是真的使用原生平台提供的设备，而是仅仅在表面上模仿它们。这意味着你可以在任意平台上使用JAVA支持的任意面板。轻量级组件的缺点则是执行速度较慢，优点就是可以在所有平台上采用统一的行为。
概念解析：
JFrame– java的GUI程序的基本思路是以JFrame为基础，它是屏幕上window的对象，能够最大化、最小化、关闭。
JPanel– Java图形用户界面(GUI)工具包swing中的面板容器类，包含在javax.swing 包中，可以进行嵌套，功能是对窗体中具有相同逻辑功能的组件进行组合，是一种轻量级容器，可以加入到JFrame窗体中。。
JLabel– JLabel 对象可以显示文本、图像或同时显示二者。可以通过设置垂直和水平对齐方式，指定标签显示区中标签内容在何处对齐。默认情况下，标签在其显示区内垂直居中对齐。默认情况下，只显示文本的标签是开始边对齐；而只显示图像的标签则水平居中对齐。
JTextField–一个轻量级组件，它允许编辑单行文本。
JPasswordField– 允许我们输入了一行字像输入框，但隐藏星号(*) 或点创建密码(密码)
JButton– JButton 类的实例。用于创建按钮类似实例中的 "Login"。
⑻ java编写用户登录
代码发给你，如果什么都不懂的话，估计你也难以运行成功，而且图片也没有，要自己会改就能运行了。这些代码希望能帮到你！
数据库文件：
create database hotel_Flyer
go
use hotel_Flyer
create table userInfo(
id int primary key identity(1,1),
userName varchar(20),
password varchar(10),
realName nvarchar(20),
sex nvarchar(2),
age int,
favorite nvarchar(100),
telNum varchar(12),
email varchar(50),
address nvarchar(200)
)
go
insert into userInfo(userName,password) values('李连杰','123')
insert into userInfo(userName,password) values('成龙','123')
insert into userInfo(userName,password) values('甄子丹','123')
insert into userInfo(userName,password) values('赵文卓','123')
insert into userInfo(userName,password) values('吴京','123')
insert into userInfo(userName,password) values('周星驰','123')
insert into userInfo(userName,password) values('刘德华','123')
加载驱动类：
public class ConToSQL {
Connection con=null;
public Connection getConnection() throws Exception{
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
con= DriverManager.getConnection("jdbc:microsoft:sqlserver://localhost:1433;databaseName=hotel_Flyer", "sa", "sa");
return con;
}
}
连接数据库类：
public class DengluUC {
Connection con=null;
PreparedStatement stm=null;
ResultSet rs=null;
public boolean checkUser(String user,String pwd){
boolean tof=false;
try {
ConToSQL cts=new ConToSQL();
con=cts.getConnection();
stm=con.prepareStatement("select password from userInfo where userName=?");
stm.setString(1, user);
rs=stm.executeQuery();
if(rs.next()){
if(rs.getString(1).equals(pwd)){
tof= true;
}
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} /*finally{
try {
rs.close();
stm.close();
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
return tof;
}*/
return tof;
}
}
登录类代码：
package com.hbsoft.hotel_Flyer.login;
import com.hbsoft.hotel_Flyer.usermanagerForm.*;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridBagLayout;
import java.awt.Rectangle;
import javax.swing.BorderFactory;
import java.awt.Color;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.JComboBox;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JButton;
import javax.swing.ImageIcon;
import javax.swing.JTextField;
import javax.swing.text.html.Option;
import com.hbsoft.hotel_Flyer.proc.Process;
import java.awt.Point;
import java.sql.*;
import com.hbsoft.hotel_Flyer.database.*;
public class Denglu {
private JFrame jFrame = null; // @jve:decl-index=0:visual-constraint="61,26"
private JPanel jContentPane = null;
private JPanel jPanel = null;
private JComboBox jComboBox = null;
private JLabel jL4 = null;
private JLabel jLabel1 = null;
private JPasswordField jPasswordField = null;
private JButton jB1 = null;
private JButton jB2 = null;
private JComboBox jComboBox1 = null;
private JLabel jLabel = null;
private JLabel jLabel2 = null;
private Connection con=null; // @jve:decl-index=0:
private Statement sts=null;
private ResultSet rs=null;
private DatabaseMetaData dmd=null;
private int rowCount=0;
/**
* This method initializes jFrame
*
* @return javax.swing.JFrame
*/
public JFrame getJFrame() {
if (jFrame == null) {
jFrame = new JFrame("系统登陆");
jFrame.setSize(new Dimension(854, 539));
jFrame.setLocation(new Point(100, 100));
jFrame.setContentPane(getJContentPane());
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jFrame.setResizable(false);
}
return jFrame;
}
/**
* This method initializes jContentPane
*
* @return javax.swing.JPanel
*/
private JPanel getJContentPane() {
if (jContentPane == null) {
jLabel2 = new JLabel();
jLabel2.setBounds(new Rectangle(3, 4, 845, 503));
jLabel2.setIcon(new ImageIcon("E:/java\uff088\uff09\u73ed\u5468\u67ab/\u7b2c\u5341\u7ec4\u5de5\u4f5c\u7ad9/hotel_Flyer/\u767b\u5f55\u80cc\u666f.jpg"));
jLabel2.setText("");
jLabel = new JLabel();
jLabel.setText("");
jLabel.setIcon(new ImageIcon(getClass().getResource("/com/hbsoft/hotel_Flyer/img/\u767b\u5f55\u80cc\u666f.jpg")));
jLabel.setBounds(new Rectangle(-1, 1, 851, 509));
jLabel1 = new JLabel();
jLabel1.setBounds(new Rectangle(438, 141, 363, 231));
jLabel1.setText("");
jL4 = new JLabel();
jL4.setBounds(new Rectangle(484, 341, 289, 28));
jL4.setHorizontalAlignment(SwingConstants.CENTER);
Timer t =new Timer(1000,new ActionListener(){
public void actionPerformed(ActionEvent e) {
Date d=new Date();
SimpleDateFormat df = new SimpleDateFormat("yy-MM-dd hh:mm:ss");
jL4.setText(df.format(d));
}
});
t.start();
jContentPane = new JPanel();
jContentPane.setLayout(null);
jContentPane.setBorder(BorderFactory.createLineBorder(Color.cyan, 2));
jContentPane.setFont(new Font("\u96b6\u4e66", Font.PLAIN, 14));
jContentPane.add(getJPanel(), null);
jContentPane.add(jL4, null);
jContentPane.add(jLabel1, null);
jContentPane.add(getJPasswordField(), null);
jContentPane.add(getJB1(), null);
jContentPane.add(getJB2(), null);
jContentPane.add(getJComboBox1(), null);
jContentPane.add(jLabel, null);
jContentPane.add(jLabel2, null);
jContentPane.add(jLabel, null);
}
return jContentPane;
}
/**
* This method initializes jPanel
*
* @return javax.swing.JPanel
*/
private JPanel getJPanel() {
if (jPanel == null) {
jPanel = new JPanel();
jPanel.setLayout(new GridBagLayout());
jPanel.setBounds(new Rectangle(0, 0, 415, 0));
}
return jPanel;
}
/**
* This method initializes jB1
*
* @return javax.swing.JButton
*/
void ThisDispose(){
this.getJFrame().dispose();
}
/**
* This method initializes jPasswordField
*
* @return javax.swing.JPasswordField
*/
private JPasswordField getJPasswordField() {
if (jPasswordField == null) {
jPasswordField = new JPasswordField();
jPasswordField.setBounds(new Rectangle(570, 263, 201, 29));
}
return jPasswordField;
}
/**
* This method initializes jB1
*
* @return javax.swing.JButton
*/
/*void ThisdDispose(){
this.getJFrame().dispose();
}*/
private JButton getJB1() {
if (jB1 == null) {
jB1 = new JButton();
jB1.setBounds(new Rectangle(489, 313, 103, 35));
jB1.setText("登陆");
jB1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
if(new DengluUC().checkUser(jComboBox1.getSelectedItem().toString(), new String(jPasswordField.getPassword()))){
//message.setText("登录成功");
//message.setForeground(new Color(255,0,0));
new Process((String)jComboBox1.getSelectedItem()).setVisible(true);
ThisDispose();
}else{
if(new String(jPasswordField.getPassword()).length()==0){
JOptionPane.showMessageDialog(null, "密码不能为空");
}else{
JOptionPane.showMessageDialog(null, "密码不正确，请重新输入");
}
}
}
});
}
return jB1;
}
/**
* This method initializes jB2
*
* @return javax.swing.JButton
*/
private JButton getJB2() {
if (jB2 == null) {
jB2 = new JButton();
jB2.setBounds(new Rectangle(642, 312, 103, 35));
jB2.setText("退出");
jB2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
System.exit(0);
}
});
}
return jB2;
}
/**
* This method initializes jComboBox1
*
* @return javax.swing.JComboBox
*/
public void getResultSet(){
try{
con=new ConToSQL().getConnection();
sts=con.createStatement();
rs=sts.executeQuery("select * from userInfo");
}catch(Exception e){
e.printStackTrace();
}
}
public int getRowCount(){
try {
rs.last();
if (rs.isLast()) {
rowCount = rs.getRow();
}
} catch (Exception e) {
e.printStackTrace();
}
return rowCount;
}
public void closeData(){
try{
rs.close();
sts.close();
con.close();
}catch(SQLException e){
e.printStackTrace();
}
}
private JComboBox getJComboBox1() {
getResultSet();
String [] arr=new String[7];
int i=0;
try {
while (rs.next()) {
if(i<arr.length){
arr[i] = rs.getString(2);
i++;}
}
} catch (Exception e) {
e.printStackTrace();
}
if (jComboBox1 == null) {
jComboBox1 = new JComboBox(arr);
closeData();
jComboBox1.setBounds(new Rectangle(569, 218, 201, 29));
}
return jComboBox1;
}
public static void main(String [] args) throws Exception{
// javax.swing.UIManager.setLookAndFeel("com.jtattoo.plaf.mcwin.McWinLookAndFeel");
javax.swing.UIManager.setLookAndFeel("com.jtattoo.plaf.acryl.AcrylLookAndFeel");
new Denglu().getJFrame().setVisible(true);
}
}
⑼ java实现简单登录界面
自己写的比较规范的代码，都有注释:
import javax.swing.JFrame;//框架
import javax.swing.JPanel;//面板
import javax.swing.JButton;//按钮
import javax.swing.JLabel;//标签
import javax.swing.JTextField;//文本框
import java.awt.Font;//字体
import java.awt.Color;//颜色
import javax.swing.JPasswordField;//密码框
import java.awt.event.ActionListener;//事件监听
import java.awt.event.ActionEvent;//事件处理
import javax.swing.JOptionPane;//消息窗口
public class UserLogIn extends JFrame{
public JPanel pnluser;
public JLabel lbluserLogIn;
public JLabel lbluserName;
public JLabel lbluserPWD;
public JTextField txtName;
public JPasswordField pwdPwd;
public JButton btnSub;
public JButton btnReset;
public UserLogIn(){
pnluser = new JPanel();
lbluserLogIn = new JLabel();
lbluserName = new JLabel();
lbluserPWD = new JLabel();
txtName = new JTextField();
pwdPwd = new JPasswordField();
btnSub = new JButton();
btnReset = new JButton();
userInit();
}
public void userInit(){
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置关闭框架的同时结束程序
this.setSize(300,200);//设置框架大小为长300,宽200
this.setResizable(false);//设置框架不可以改变大小
this.setTitle("用户登录");//设置框架标题
this.pnluser.setLayout(null);//设置面板布局管理
this.pnluser.setBackground(Color.cyan);//设置面板背景颜色
this.lbluserLogIn.setText("用户登录");//设置标签标题
this.lbluserLogIn.setFont(new Font("宋体",Font.BOLD | Font.ITALIC,14));//设置标签字体
this.lbluserLogIn.setForeground(Color.RED);//设置标签字体颜色
this.lbluserName.setText("用户名:");
this.lbluserPWD.setText("密 码:");
this.btnSub.setText("登录");
this.btnReset.setText("重置");
this.lbluserLogIn.setBounds(120,15,60,20);//设置标签x坐标120,y坐标15,长60,宽20
this.lbluserName.setBounds(50,55,60,20);
this.lbluserPWD.setBounds(50,85,60,25);
this.txtName.setBounds(110,55,120,20);
this.pwdPwd.setBounds(110,85,120,20);
this.btnSub.setBounds(85,120,60,20);
this.btnSub.addActionListener(new ActionListener()//匿名类实现ActionListener接口
{
public void actionPerformed(ActionEvent e){
btnsub_ActionEvent(e);
}
}
);
this.btnReset.setBounds(155,120,60,20);
this.btnReset.addActionListener(new ActionListener()//匿名类实现ActionListener接口
{
public void actionPerformed(ActionEvent e){
btnreset_ActionEvent(e);
}
}
);
this.pnluser.add(lbluserLogIn);//加载标签到面板
this.pnluser.add(lbluserName);
this.pnluser.add(lbluserPWD);
this.pnluser.add(txtName);
this.pnluser.add(pwdPwd);
this.pnluser.add(btnSub);
this.pnluser.add(btnReset);
this.add(pnluser);//加载面板到框架
this.setVisible(true);//设置框架可显
}
public void btnsub_ActionEvent(ActionEvent e){
String name = txtName.getText();
String pwd = String.valueOf(pwdPwd.getPassword());
if(name.equals("")){
JOptionPane.showMessageDialog(null,"账号不能为空","错误",JOptionPane.ERROR_MESSAGE);
return;
}else if (pwd.equals("")){
JOptionPane.showMessageDialog(null,"密码不能为空","错误",JOptionPane.ERROR_MESSAGE);
return;
}else if(true){
this.dispose();
}else{
JOptionPane.showMessageDialog(null,"账号或密码错误","错误",JOptionPane.ERROR_MESSAGE);
return;
}
}
public void btnreset_ActionEvent(ActionEvent e){
txtName.setText("");
pwdPwd.setText("");
}
public static void main(String[] args){
new UserLogIn();
}
}
⑽ 用java语言写一个用户登陆界面
//这个是我写的，里面有连接数据库的部分。你可以拿去参考一下
importjava.awt.*;
importjavax.swing.*;
importjava.awt.event.*;
importjava.sql.*;
//throwsException
{
JLabellbl1=newJLabel("用户名:");
JLabellbl2=newJLabel("密码:");
JTextFieldtxt=newJTextField(5);
JPasswordFieldpf=newJPasswordField();
JButtonbtn1=newJButton("确定");
JButtonbtn2=newJButton("取消");
publicLoginFrm(){
this.setTitle("登陆");
JPaneljp=(JPanel)this.getContentPane();
jp.setLayout(newGridLayout(3,2,5,5));
jp.add(lbl1);
jp.add(txt);
jp.add(lbl2);
jp.add(pf);
jp.add(btn1);
jp.add(btn2);
btn1.addActionListener(this);
btn2.addActionListener(this);
}
publicvoidactionPerformed(ActionEventae){
if(ae.getSource()==btn1){
try{
Class.forName("com.mysql.jdbc.Driver");//mysql数据库
Connectioncon=DriverManager.getConnection(
"jdbc:mysql://localhost/Car_zl","root","1");//数据库名为Car_zl，密码为1
System.out.println("com:"+con);
Statementcmd=con.createStatement();
Stringsql="select*fromuserwhereUser_ID='"
+txt.getText()+"'andUser_ps='"
+pf.getText()+"'";
ResultSetrs=cmd
.executeQuery(sql);//表名为user，user_ID和User_ps是存放用户名和密码的字段名
if(rs.next()){
JOptionPane.showMessageDialog(null,"登陆成功！");
}else
JOptionPane.showMessageDialog(null,"用户名或密码错误！");
}catch(Exceptionex){
}
if(ae.getSource()==btn2){
System.out.println("1111111111111");
//txt.setText("");
//pf.setText("");
System.exit(0);
}
}
}
publicstaticvoidmain(Stringarg[]){
JFrame.(true);
LoginFrmfrm=newLoginFrm();
frm.setSize(400,200);
frm.setVisible(true);
}
}