java注册登陆
A. 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);
}
}
B. java 登录注册界面代码怎么写不链接数据库。不用mysql ！
给你提供个思路吧
1、注册界面把注册的人的用户名和密码存储到本地的一个txt文件中
2、登录时比较登录输入的用户名和密码和txt文件中的是否一致，如果一致就允许登录，不一致提示异常
C. 用java编程实现用户注册并进行登录操作
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
D. 求用java实现简单的登录和注册功能，主要是为了了解怎样对数据库进行
//User 用户的基本信息，也是USERINFO表中的3个列
package 登陆判断;
public class User {
private String name;
private String loginname;
private String loginpsw;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getLoginname() {
return loginname;
}
public void setLoginname(String loginname) {
this.loginname = loginname;
}
public String getLoginpsw() {
return loginpsw;
}
public void setLoginpsw(String loginpsw) {
this.loginpsw = loginpsw;
}
}
//用于注册和登陆的小小代码块
package 登陆判断;
import java.util.Scanner;
public class In {
public static User getUser(){
User u = new User();
Scanner sc = new Scanner(System.in);
System.out.println("请输入登陆名");
u.setLoginname(sc.nextLine());
System.out.println("请输入密码");
u.setLoginpsw(sc.nextLine());
return u;
}
public static User registerUser(){
User u = new User();
Scanner sc = new Scanner(System.in);
System.out.println("请注册用户名名");
u.setName(sc.nextLine());
System.out.println("请注册登陆名");
u.setLoginname(sc.nextLine());
System.out.println("请注册密码");
u.setLoginpsw(sc.nextLine());
return u;
}
}
//登陆时的检查，判断登陆名和密码是否正确，正确则返回 用户名
package 登陆判断;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class Check {
public static void checkUser(User u)
{
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
String url = "jdbc:oracle:thin:@localhost:1521:orcl";
String user = "scott";
String password = "tiger";
Connection conn = null;
ResultSet rs = null;
PreparedStatement pst = null;
String sql = "Select name from USERINFO where loginname = ? and loginpsw = ? ";
try {
conn = DriverManager.getConnection(url, user, password);
pst = conn.prepareStatement(sql);
pst.setString(1, u.getLoginname());
pst.setString(2,u.getLoginpsw());
rs = pst.executeQuery();
while(rs.next()){
u.setName(rs.getString(1));
}
} catch (SQLException e) {
e.printStackTrace();
}finally{
try {
rs.close();
pst.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(u.getName() == null || u.getName().isEmpty()){
System.out.println("登陆失败");
}else{
System.out.println("欢迎"+u.getName()+"登陆");
}
}
}
//注册界面，要判断 登陆名是否有重复，有重复则注册失败。有点小疑问，已用注释标出来
package 登陆判断;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class Register {
public static void registUser(User u){
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
String url = "jdbc:oracle:thin:@localhost:1521:orcl";
String user = "scott";
String password = "tiger";
Connection conn = null;
String sql = "Insert Into USERINFO values(?,?,?)";
PreparedStatement pst = null;
//判断登陆名是否已经存在
Statement s = null;
ResultSet rs = null;
String sql_ck = "Select LOGINNAME FROM USERINFO";
try {
conn = DriverManager.getConnection(url, user, password);
pst = conn.prepareStatement(sql);
pst.setString(1, u.getName());
pst.setString(2, u.getLoginname());
pst.setString(3, u.getLoginpsw());
//判断登陆名是否已经存在
s = conn.createStatement();
rs = s.executeQuery(sql_ck);
while(rs.next()){//为什么用 rs.getString(2)会提示 无效的索引呢
if( rs.getString("LOGINNAME").equals(u.getLoginname()) ){
System.out.println("登陆名已经存在，注册失败");
break;
}else{
pst.executeUpdate();
System.out.println("注册成功");
break;
}
}
} catch (SQLException e) {
e.printStackTrace();
}finally{
try {
rs.close();
pst.close();
s.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
//main界面//
//数据库中表的结构式这样
//name(用户名，用于显示),
//loginname(登录名,即登陆时输入的ID)
//loginpsw(登陆时输入的密码)
package 登陆判断;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
int chos = 0;
Scanner sc = new Scanner(System.in);
System.out.println("\t\t登陆请按1\t\t注册请按2");
chos = sc.nextInt();
switch(chos){
case 1: Check.checkUser(In.getUser());break;
case 2: Register.registUser(In.registerUser());break;
default: System.out.println("请输入正确的选择");break;
}
}
}
E. java不用数据库怎么实现用户的注册登录
是可以的，使用文件流读取就好，注册密码，通过自己算法加密存放在文件里面就好。然后从文件使用文件流一行一行的读取，通过字符串切割，获取用户名和密码，在通过字符串来判断是会否相符就好
F. 性能测试中如何使用java批量注册登录账户
性能测试中示例代码使用java批量注册登录账户。
性能测试过程中所需的测试数据，以登录为例，为了更真实的模 批量读取注册。
Java登录注册功能实现代码解析，文中通示例代码，每个用户信息都是唯一的，所以可以借助Set的特性来操作用户信息的存放。
G. java注册登录
不清楚LZ的意思，不连接数据库么？
H. java通过集合注册登陆系统.求解
importjava.util.ArrayList;
importjava.util.List;
importjava.util.Scanner;
publicclassStudentManage{
List<User>userList=newArrayList<>();
staticScannersc=newScanner(System.in);
publicstaticvoidmain(String[]args){
StudentManagesmManage=newStudentManage();
while(true){
System.out.println("--------请选择操作-------- 1.用户登录 2.用户注册 3.退出");
System.out.println("-------------------------");
System.out.println("输入：");
StringopString=sc.next();
switch(opString){
case"1":
smManage.login();
break;
case"2":
smManage.regist();
break;
case"3":
System.exit(0);
break;
default:
System.out.println("输入错误");
break;
}
}
}
//userlogin
publicvoidlogin(){
System.out.println("--------用户登录--------");
System.out.println("请输入用户名：");
Stringusername=sc.next();
System.out.println("请输入密码：");
Stringpassword=sc.next();
if(userList.contains(newUser(username,password))){
System.out.println("登录成功");
}else{
System.out.println("用户名或密码错误！");
}
}
//userregist
publicvoidregist(){
System.out.println("--------用户注册--------");
booleanflag=true;
Stringusername="";
while(flag){
System.out.println("请输入用户名：");
username=sc.next();
if(userList.size()>0){
for(Useruser:userList){
if(user.getUsername().equals(username)){
flag=true;
System.out.println("Tips:用户名已存在，请重新输入！");
break;
}else{
flag=false;
}
}
}
else{
flag=false;
}
}
System.out.println("请输入密码：");
Stringpassword=sc.next();
userList.add(newUser(username,password));
}
}
classUser{
privateStringusername;
privateStringpassword;
publicUser(Stringusername,Stringpassword){
super();
this.username=username;
this.password=password;
}
publicStringgetUsername(){
returnusername;
}
publicvoidsetUsername(Stringusername){
this.username=username;
}
publicStringgetPassword(){
returnpassword;
}
publicvoidsetPassword(Stringpassword){
this.password=password;
}
@Override
publicinthashCode(){
finalintprime=31;
intresult=1;
result=prime*result+((password==null)?0:password.hashCode());
result=prime*result+((username==null)?0:username.hashCode());
returnresult;
}
@Override
publicbooleanequals(Objectobj){
if(this==obj)
returntrue;
if(obj==null)
returnfalse;
if(getClass()!=obj.getClass())
returnfalse;
Userother=(User)obj;
if(password==null){
if(other.password!=null)
returnfalse;
}elseif(!password.equals(other.password))
returnfalse;
if(username==null){
if(other.username!=null)
returnfalse;
}elseif(!username.equals(other.username))
returnfalse;
returntrue;
}
}
I. java使用面向对象写一个登录注册查询的功能
import java.util.Scanner;/**
* 采用面向对象的方式 写一个登录系统
* @author Administrator
*
*///用户信息class UserInfo{ public static String[] user = new String[10]; public static String[] passwd = new String[10];
public UserInfo() { this.user[0] = "test"; this.passwd[0] ="123456";
}
}//找回密码class ZhaoHui extends UserInfo{ public static void zhaohui() {
Scanner s = new Scanner(System.in);
System.out.println("请输入你要找回的用户名：");
String zname = s.nextLine(); for(int i=0;i<2;i++) { if(user[i].equals(zname)) {
Scanner ss = new Scanner(System.in);
System.out.println("恭喜你!成功找回密码，请输入："+"'张哥最帅'"+" 查看密码");
String zgzs = ss.nextLine();
if("张哥最帅".equals(zgzs)) {
System.out.println(passwd[i]);
}else {
System.out.println("请输正确！");
}
}else if(user[i]!=zname){
System.out.println("用户名不存在！"); return;
}
break;
}
}
}//修改密码 class XiuGai extends UserInfo{ public static void xiugai() {
Scanner s =new Scanner(System.in);
System.out.println("请输入您要修改的密码：");
String xpasswd = s.nextLine(); for(int i=0;i<2;i++) {
passwd[i] = xpasswd; if(xpasswd.equals(passwd[i])) {
System.out.println("恭喜你，修改成功！"); break;
}else {
System.out.println("修改密码失败"); break;
}
}
}
}//查询用户class ChaXun extends UserInfo{
public static void select() { for(int i=0;i<2;i++) {
System.out.println("当前用户："+user[i] +"\n"+ "当前密码："+passwd[i] );
i++; break;
}
}
}//注册class ZhuCe extends UserInfo{
public static void regist() {
Scanner ss = new Scanner(System.in);
System.out.println("请输入用户名：");
String suser = ss.nextLine();
System.out.println("请输入密码：");
String spasswd = ss.nextLine();
for(int i=0;i<user.length;i++) {
user[i] = suser;
passwd[i] = spasswd;
System.out.println("注册成功!"); break;
}
}
}//登录class Loginc extends UserInfo{
public static void login() { int flag = 1;
Scanner scanner = new Scanner(System.in);
System.out.println("请输入用户名：");
String users = scanner.nextLine();
System.out.println("请输入密码：");
String passwds = scanner.nextLine();
for(int i=0;i<UserInfo.user.length;i++) { if(user[i].equals(users) && passwd[i].equals(passwds)) {
System.out.println("登陆成功！"); break;
}
System.out.println("登陆失败！"); break;
}
}
}//主界面class ZhuJieMian{ public static void Start() {
Loginc Loginc = new Loginc();
ZhuCe ZhuCe = new ZhuCe();
ChaXun ChaXun = new ChaXun();
XiuGai XiuGai = new XiuGai();
ZhaoHui ZhaoHui = new ZhaoHui();
Scanner s = new Scanner(System.in); while(true) {
System.out.println("|"+ "\t"+ "\t"+ "\t"+ "\t"+ "\t"+ "\t"+ "\t"+"\t"+"|");
System.out.println("|"+"\t" + "测试用户名:test 测试密码:123456" + "\t"+ "\t"+ "\t"+ "\t"+"|");
System.out.println("|" + "\t"+ "请输入[1-5]进行操作 1.登录|2.注册|3.查询当前用户|4.修改密码|5.找回密码 " + "\t"+"|");
System.out.print("请输入:"); int temp = s.nextInt();
switch(temp) { case 1:Loginc.login(); break; case 2:ZhuCe.regist();; break; case 3:ChaXun.select();; break; case 4:XiuGai.xiugai();; break; case 5:ZhaoHui.zhaohui();; break; default:System.out.println("错误！请重写输入正确的数字进行操作！");
}
}
}
}public class LoginTest { public static void main(String[] args) {
ZhuJieMian zjm = new ZhuJieMian();
zjm.Start();
}
}
J. java语言实现用户注册和登录
//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.(true);
LoginFrm frm = new LoginFrm();
frm.setSize(400, 200);
frm.setVisible(true);
}
}