界面建议用可视化来做，美观且便捷。下面这个是完全用代码写的，仅供参考。
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import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.sql.*;
public class Register extends JFrame {
JLabel jl1 = new JLabel("用户名");
JTextField jt1 = new JTextField();
JLabel jl2 = new JLabel("邮箱");
JTextField jt2 = new JTextField();
JLabel jl3 = new JLabel("密码");
JPasswordField jpw1 = new JPasswordField();
JLabel jl4 = new JLabel("密码确认");
JPasswordField jpw2 = new JPasswordField();
JButton register = new JButton("注册");
JButton clean = new JButton("清空");
public Register(){
setLayout(new GridLayout(5,2));
add(jl1);
add(jt1);
add(jl2);
add(jt2);
add(jl3);
add(jpw1);
add(jl4);
add(jpw2);
add(register);
add(clean);
String name = jt1.getText();
String email = jt2.getText();
String pw = jpw1.getText();
register.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
try{
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost/db","root","");
Statement sta = con.createStatement();
sta.executeUpdate("INSERT INTO register VALUES(name,email,pw)");
JOptionPane.showMessageDialog(null,"注册成功","提示",JOptionPane.INFORMATION_MESSAGE);
}
catch(Exception ex){
ex.getStackTrace();
}
}
});
clean.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
jt1.setText("");
jt2.setText("");
jpw1.setText("");
jpw2.setText("");
}
});
}
public static void main(String[] args){
Register frame = new Register();
frame.setTitle("用户注册");
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400,400);
frame.setVisible(true);
}
}
效果图
代码
!DOCTYPE html
html
head
meta charset="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: 0 auto;
margin-top: 25px;
}
#top_top{
width: 1000px;
height: 65px;
background: deepskyblue;
}
#top_top_left{
width: 300px;
height: 65px;
float: left;
}
#top_top_leftlabel{
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: 0 auto;
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#loginimg{
float: left;
}
#content#login#select{
width: 305px;
height: 210px;
float: right;
}
#content#login#selectdiv{
width: 230;
height: 30px;
margin-left: 30px;
}
#content#login#select#d1{
margin-top:30px;
margin-bottom: 3px;
}
#content#login#selectp{
font-size: 14px;
margin-left: 95px;
}
#bottom{
width: 1000px;
height: 35px;
line-height: 35px;
margin: 0 auto;
background: deepskyblue;
text-align: center;
color: white;
}
/style
/head
body
div id="top"
div id="top_top"
div id="top_top_left"
img src="img/test/a13.png" width="78px" height="65px"label id="a2"先锋图书馆系统管理平台/label
/div
/div
div id="top_bottom"
div id="top_bottom_left"当前位置 : 首页 系统管理 登录/div
div id="top_bottom_right"当前时间 : label id="lable"/label/div
/div
/div
div id="content"
div id="text"欢迎登录先锋图书馆管理系统/div
div id="login"
img src="img/test/a14.png" width="175px" height="210px"/
form id="select"
div id="d1"用户名: nbsp;nbsp;input type="text" //div
div密 nbsp; 码: nbsp;nbsp;input type="password" //div
p
input type="radio" name="user" value="read"/读者nbsp;nbsp;nbsp;nbsp;
input type="radio" name="user" value="admin"/管理员
/pbr/
p
input type="button" value="确定" style="width: 50px;" onclick="put()"/nbsp;nbsp;nbsp;nbsp;
input type="reset" value="重置" style="width: 50px;"/
/p
/form
/div
/div
div id="bottom"欣欣科技有限公司版权所有/div
/body
script type="text/javascript" src="JQuery/jquery.js"/script
script type="text/javascript" src="js/GetCurrentTime.js"/script
script
//验证用户名和密码
function put(){
var d = $("#selectdivinput");//获取用户名和密码
var name = d[0].value;
var pass = d[1].value;
var user = null;
var r = document.getElementsByName("user");//获取用户类型
for(i=0;ir.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!");
}else if(user=="admin" name!="admin"){
window.alter("用户名错误!");
}else if(user=="admin" name=="admin" pass!="123456"){
window.alert("密码错误!");
}else if(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
public class User{
//定义私有属性 用户名和密码
private String userName;
private String password;
public User(String userName,String password){
this.userName=userName;
this.password=password;
}
//私有属性的set get 方法
public void setUserName(String userName){
this.userName=userName;
}
public void setPassword(String password){
this.password=password;
}
public String getUserName(){
return this.userName;
}
public String getPassword(){
return this.password;
}
//用来判断用户名和密码是否正确
public boolean panDuan(){
if("用户名".equals(this.userName)"密码".equals(this.password)){
System.out.println("登入成功！");
return true;
}else{
System.out.println("登入失败！");
return false;
}
}
public static void main (String[] args){
System.out.println("请输入用户名:");
scanner sc=new scanner(System.in);
String userName=sc.nextLine();
System.out.println("请输入密码:");
String password=sc.nextLine();
User u=new User(userName,password);
u.panDuan();
}
}
补充：Java是一种可以撰写跨平台应用程序的面向对象的程序设计语言。Java 技术具有卓越的通用性、高效性、平台移植性和安全性，广泛应用于PC、数据中心、游戏控制台、科学超级计算机、移动电话和互联网，同时拥有全球最大的开发者专业社群。
String username = "",password = "",passwordagain = ""; // 定义用户名和密码
将该变量等于为全局变量 或局部变量即可
//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
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.sql.*;
class LoginFrm extends JFrame implements ActionListener// throws Exception
{
JLabel lbl1 = new JLabel("用户名:");
JLabel lbl2 = new JLabel("密码:");
JTextField txt = new JTextField(5);
JPasswordField pf = new JPasswordField();
JButton btn1 = new JButton("确定");
JButton btn2 = new JButton("取消");
public LoginFrm() {
this.setTitle("登陆");
JPanel jp = (JPanel) this.getContentPane();
jp.setLayout(new GridLayout(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);
}
public void actionPerformed(ActionEvent ae) {
if (ae.getSource() == btn1) {
try {
Class.forName("com.mysql.jdbc.Driver");// mysql数据库
Connection con = 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);
Statement cmd = con.createStatement();
String sql = "select * from user where User_ID='"
+ txt.getText() + "' and User_ps='"
+ pf.getText() + "'" ;
ResultSet rs = 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 (Exception ex) {
}
if (ae.getSource() == btn2) {
System.out.println("1111111111111");
//txt.setText("");
//pf.setText("");
System.exit(0);
}
}
}
public static void main(String arg[]) {
JFrame.setDefaultLookAndFeelDecorated(true);
LoginFrm frm = new LoginFrm();
frm.setSize(400, 200);
frm.setVisible(true);
}
}
