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java注冊登陸

發布時間: 2022-06-29 22:25:34

A. 用java編寫注冊登錄程序

什麼都不說了 直接給你代碼吧
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("登錄");
private Container c = frame.getContentPane();
private JTextField username = new JTextField();
private JPasswordField password = new JPasswordField();
private JButton ok = new JButton("確定");
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() {
// 頂部
JPanel titlePanel = new JPanel();
titlePanel.setLayout(new FlowLayout());
titlePanel.add(new JLabel("系統管理員登錄"));
c.add(titlePanel, "North");
// 中部表單
JPanel fieldPanel = new JPanel();
fieldPanel.setLayout(null);
JLabel a1 = new JLabel("用戶名:");
a1.setBounds(50, 20, 50, 20);
JLabel a2 = new JLabel("密 碼:");
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");
// 底部按鈕
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 登錄注冊界面代碼怎麼寫不鏈接資料庫。不用mysql

給你提供個思路吧
1、注冊界面把注冊的人的用戶名和密碼存儲到本地的一個txt文件中
2、登錄時比較登錄輸入的用戶名和密碼和txt文件中的是否一致,如果一致就允許登錄,不一致提示異常

C. 用java編程實現用戶注冊並進行登錄操作

String username = "",password = "",passwordagain = ""; // 定義用戶名和密碼

將該變數等於為全局變數 或局部變數即可

D. 求用java實現簡單的登錄和注冊功能,主要是為了了解怎樣對資料庫進行

//User 用戶的基本信息,也是USERINFO表中的3個列
package 登陸判斷;

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;
}
}
//用於注冊和登陸的小小代碼塊
package 登陸判斷;

import java.util.Scanner;

public class In {

public static User getUser(){
User u = new User();
Scanner sc = new Scanner(System.in);
System.out.println("請輸入登陸名");
u.setLoginname(sc.nextLine());
System.out.println("請輸入密碼");
u.setLoginpsw(sc.nextLine());
return u;
}
public static User registerUser(){
User u = new User();
Scanner sc = new Scanner(System.in);
System.out.println("請注冊用戶名名");
u.setName(sc.nextLine());
System.out.println("請注冊登陸名");
u.setLoginname(sc.nextLine());
System.out.println("請注冊密碼");
u.setLoginpsw(sc.nextLine());
return u;
}
}

//登陸時的檢查,判斷登陸名和密碼是否正確,正確則返回 用戶名
package 登陸判斷;

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("登陸失敗");
}else{
System.out.println("歡迎"+u.getName()+"登陸");
}

}
}

//注冊界面,要判斷 登陸名是否有重復,有重復則注冊失敗。有點小疑問,已用注釋標出來
package 登陸判斷;

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;

//判斷登陸名是否已經存在
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());
//判斷登陸名是否已經存在
s = conn.createStatement();
rs = s.executeQuery(sql_ck);
while(rs.next()){//為什麼用 rs.getString(2)會提示 無效的索引呢
if( rs.getString("LOGINNAME").equals(u.getLoginname()) ){
System.out.println("登陸名已經存在,注冊失敗");
break;
}else{
pst.executeUpdate();
System.out.println("注冊成功");
break;
}
}
} catch (SQLException e) {
e.printStackTrace();
}finally{
try {
rs.close();
pst.close();
s.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}

}
}
//main界面//
//資料庫中表的結構式這樣
//name(用戶名,用於顯示),
//loginname(登錄名,即登陸時輸入的ID)
//loginpsw(登陸時輸入的密碼)
package 登陸判斷;

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登陸請按1\t\t注冊請按2");
chos = sc.nextInt();
switch(chos){
case 1: Check.checkUser(In.getUser());break;
case 2: Register.registUser(In.registerUser());break;
default: System.out.println("請輸入正確的選擇");break;
}
}

}

E. java不用資料庫怎麼實現用戶的注冊登錄

是可以的,使用文件流讀取就好,注冊密碼,通過自己演算法加密存放在文件裡面就好。然後從文件使用文件流一行一行的讀取,通過字元串切割,獲取用戶名和密碼,在通過字元串來判斷是會否相符就好

F. 性能測試中如何使用java批量注冊登錄賬戶

性能測試中示例代碼使用java批量注冊登錄賬戶。
性能測試過程中所需的測試數據,以登錄為例,為了更真實的模 批量讀取注冊。
Java登錄注冊功能實現代碼解析,文中通示例代碼,每個用戶信息都是唯一的,所以可以藉助Set的特性來操作用戶信息的存放。

G. java注冊登錄

不清楚LZ的意思,不連接資料庫么?

H. java通過集合注冊登陸系統.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("--------請選擇操作-------- 1.用戶登錄 2.用戶注冊 3.退出");
System.out.println("-------------------------");
System.out.println("輸入:");
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("輸入錯誤");
break;
}
}
}

//userlogin
publicvoidlogin(){
System.out.println("--------用戶登錄--------");
System.out.println("請輸入用戶名:");
Stringusername=sc.next();
System.out.println("請輸入密碼:");
Stringpassword=sc.next();
if(userList.contains(newUser(username,password))){
System.out.println("登錄成功");
}else{
System.out.println("用戶名或密碼錯誤!");
}
}

//userregist
publicvoidregist(){
System.out.println("--------用戶注冊--------");
booleanflag=true;
Stringusername="";
while(flag){
System.out.println("請輸入用戶名:");
username=sc.next();
if(userList.size()>0){
for(Useruser:userList){
if(user.getUsername().equals(username)){
flag=true;
System.out.println("Tips:用戶名已存在,請重新輸入!");
break;
}else{
flag=false;
}
}
}
else{
flag=false;
}
}
System.out.println("請輸入密碼:");
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使用面向對象寫一個登錄注冊查詢的功能

import java.util.Scanner;/**
* 採用面向對象的方式 寫一個登錄系統
* @author Administrator
*
*///用戶信息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";

}

}//找回密碼class ZhaoHui extends UserInfo{ public static void zhaohui() {
Scanner s = new Scanner(System.in);
System.out.println("請輸入你要找回的用戶名:");
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!成功找回密碼,請輸入:"+"'張哥最帥'"+" 查看密碼");
String zgzs = ss.nextLine();
if("張哥最帥".equals(zgzs)) {
System.out.println(passwd[i]);
}else {
System.out.println("請輸正確!");
}
}else if(user[i]!=zname){
System.out.println("用戶名不存在!"); return;
}
break;
}
}
}//修改密碼 class XiuGai extends UserInfo{ public static void xiugai() {

Scanner s =new Scanner(System.in);
System.out.println("請輸入您要修改的密碼:");
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("修改密碼失敗"); break;
}
}
}
}//查詢用戶class ChaXun extends UserInfo{
public static void select() { for(int i=0;i<2;i++) {
System.out.println("當前用戶:"+user[i] +"\n"+ "當前密碼:"+passwd[i] );
i++; break;
}
}
}//注冊class ZhuCe extends UserInfo{
public static void regist() {
Scanner ss = new Scanner(System.in);
System.out.println("請輸入用戶名:");
String suser = ss.nextLine();
System.out.println("請輸入密碼:");
String spasswd = ss.nextLine();
for(int i=0;i<user.length;i++) {

user[i] = suser;
passwd[i] = spasswd;
System.out.println("注冊成功!"); break;

}
}
}//登錄class Loginc extends UserInfo{
public static void login() { int flag = 1;
Scanner scanner = new Scanner(System.in);
System.out.println("請輸入用戶名:");
String users = scanner.nextLine();
System.out.println("請輸入密碼:");
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("登陸成功!"); break;
}
System.out.println("登陸失敗!"); 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" + "測試用戶名:test 測試密碼:123456" + "\t"+ "\t"+ "\t"+ "\t"+"|");
System.out.println("|" + "\t"+ "請輸入[1-5]進行操作 1.登錄|2.注冊|3.查詢當前用戶|4.修改密碼|5.找回密碼 " + "\t"+"|");
System.out.print("請輸入:"); 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("錯誤!請重寫輸入正確的數字進行操作!");

}
}
}

}public class LoginTest { public static void main(String[] args) {
ZhuJieMian zjm = new ZhuJieMian();
zjm.Start();

}

}

J. java語言實現用戶注冊和登錄

//這個是我寫的,裡面有連接資料庫的部分。你可以拿去參考一下
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("用戶名:");
JLabel lbl2 = new JLabel("密碼:");
JTextField txt = new JTextField(5);
JPasswordField pf = new JPasswordField();
JButton btn1 = new JButton("確定");
JButton btn2 = new JButton("取消");

public LoginFrm() {
this.setTitle("登陸");
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資料庫
Connection con = DriverManager.getConnection(
"jdbc:mysql://localhost/Car_zl", "root", "1");// 資料庫名為Car_zl,密碼為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);// 表名為user,user_ID和User_ps是存放用戶名和密碼的欄位名

if (rs.next()) {
JOptionPane.showMessageDialog(null, "登陸成功!");
} else
JOptionPane.showMessageDialog(null, "用戶名或密碼錯誤!");
} 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);
}
}

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