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JAVA登陸分級(jí)代碼 java編寫登錄系統(tǒng)

在JAVA中實(shí)現(xiàn)限制登陸次數(shù)的代碼，超過(guò)三次確定鍵將不能用

import java.awt.event.*;

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import java.awt.*;

import javax.swing.*;

import java.sql.*;

public class Login extends JFrame implements ActionListener{

JButton button1,button2;

static JTextField text1,text2;

JPanel panel1,panel2,panel3,panel4,panel5;

Container con1;

int count=0;//密碼輸入次數(shù)計(jì)數(shù)器

Login()

{

super("用戶登陸");

text1=new JTextField(10);

text2=new JPasswordField(10);

button1=new JButton("提交");

button2=new JButton("取消");

panel1 = new JPanel();

panel2 = new JPanel();

panel3 = new JPanel();

panel4 = new JPanel();

panel5 = new JPanel();

setLocation(350,250);

con1=getContentPane();

con1.setLayout(new GridLayout(5,1));

con1.setPreferredSize(new Dimension(300,250));

panel1.add(new JLabel(""));

panel2.add(new JLabel("用戶名:"));

panel2.add(text1);

panel3.add(new JLabel("密 碼:"));

panel3.add(text2);

panel4.add(button1);

panel4.add(button2);

panel5.add(new JLabel(""));

con1.add(panel1);

con1.add(panel2);

con1.add(panel3);

con1.add(panel4);

con1.add(panel5);

addWindowListener(new WindowAdapter()

{ public void windowClosing(WindowEvent e)

{ setVisible(false);

System.exit(0);

}

});

button1.addActionListener(this);

button2.addActionListener(this);

this.setResizable(false);

setVisible(true);

}

public void actionPerformed(ActionEvent e)

{

if(e.getSource()==button1)

{

try{登陸();}

catch(SQLException ee){}

}

else if(e.getSource()==button2)

{

退出銷售系統(tǒng)();

}

}

public void 登陸() throws SQLException

{

Database db=new Database();

if(count3)

{

if(db.check())

{

JOptionPane.showMessageDialog(this,"登陸成功!","提示對(duì)話框",JOptionPane.WARNING_MESSAGE);

setVisible(false);

MainFrame f=new MainFrame();f.pack();

}

else

{

count++;

if(count3)

{

JOptionPane.showMessageDialog(this,"登陸失敗!","提示對(duì)話框",JOptionPane.WARNING_MESSAGE);

}

else

{

JOptionPane.showMessageDialog(this,"密碼錯(cuò)誤超過(guò)3次!","警告對(duì)話框",JOptionPane.WARNING_MESSAGE);

System.exit(0);

}

}

}

else

{

JOptionPane.showMessageDialog(this,"密碼錯(cuò)誤超過(guò)3次!","警告對(duì)話框",JOptionPane.WARNING_MESSAGE);

System.exit(0);

}

}

public void 退出銷售系統(tǒng)()

{

System.exit(0);

}

}

登錄界面的java代碼，分別有教師登錄，管理員登錄，學(xué)生登錄，右邊是用戶名和密碼，見圖。

分三個(gè)包，自己建個(gè)包，導(dǎo)進(jìn)去就ok了，數(shù)據(jù)庫(kù)是access的。

package 登錄;

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("登陸界面");

frame.setBounds(100, 100, 450, 300);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.getContentPane().setLayout(null);

frame.setResizable(false);

JLabel lblNewLabel = new JLabel("用戶名");

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　碼");

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　錄");

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) //有此用戶

{

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 登錄;

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 操作處理.UsersCL;

/**@author 20111024

* 檢測(cè)登錄的用戶在數(shù)據(jù)庫(kù)中有無(wú)，若沒(méi)有，則提示沒(méi)有此用戶，

* 若有，則判斷級(jí)別：普通用戶還是管理員。

*/

public class UserCheck {

private int i=0; //用戶級(jí)別:0不是用戶、1是管理員、2是普通用戶

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())

{

//數(shù)據(jù)庫(kù)中有此用戶，訪問(wèn)成功

i=Integer.parseInt(rs.getString(3));

UsersCL UL=new UsersCL(i);

}

else

{

i=0; //沒(méi)有用戶是默認(rèn)是0級(jí)

}

} 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 操作處理;

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("用戶處理界面");

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("學(xué)　號(hào)");

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　齡");

label_1.setBounds(24, 110, 74, 29);

frame.getContentPane().add(label_1);

label_3 = new JLabel("性　別");

label_3.setBounds(24, 149, 74, 29);

frame.getContentPane().add(label_3);

JLabel label_2 = new JLabel("狀　態(tài)");

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("刪　除");

button_1.setBounds(276, 145, 113, 29);

frame.getContentPane().add(button_1);

button_1.addActionListener(this);

button_1.setActionCommand("刪除");

}

JButton button = new JButton("查　詢");

button.setBounds(276, 91, 113, 29);

frame.getContentPane().add(button);

button.addActionListener(this);

button.setActionCommand("查詢");

}

@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("查詢"))

{

query="select * from students where XSB="+num+";";

count=2;

}

else if(e.getActionCommand().equals("刪除"))

{

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("已經(jīng)由此記錄，不能追加！");

else

{

stmt.executeUpdate(query);

textField_3.setText("已經(jīng)追加完成！");

}

}

else if(2==count)

{

stmt.executeQuery(query);

rs=stmt.executeQuery(query);

if(rs.next())

{

textField_3.setText("已查找到此記錄！");

}

else

{

textField_3.setText("沒(méi)有此記錄，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("已刪除此記錄！");

}

else

textField_3.setText("無(wú)此記錄！");

}

} catch (ClassNotFoundException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

} catch (SQLException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

finally{

//關(guān)閉資源

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;

}

}

}

}

登陸界面的java代碼怎么寫？

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

import java.sql.*;

class LoginFrm extends JFrame implements ActionListener

{

JLabel lbl1=new JLabel("用戶名");

JLabel lbl2=new JLabel("密碼");

JTextField txt=new JTextField(15);

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(3,2,10,10));

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("sun.jdbc.odbc.JdbcOdbcDriver")；

Connection con=DriverManager.getConnection("jdbc:odbc:MyDB","","");

Statement cmd=con.createStatement();

ResultSet rs=cmd.executeQuery("select * from loginAndpassword where login='"+txt.getText()+"' and password='"+pf.getText()+"'");

if(rs.next())

{

JOptionPane.showMessageDialog(null,"登陸成功！");

}

else

JOptionPane.showMessageDialog(null,"用戶名或密碼錯(cuò)誤！");

} catch(Exception ex){}

if(ae.getSource()==btn2)

{

txt.setText("");

pf.setText("");

}

}

}

public static void main(String arg[])

{

JFrame.setDefaultLookAndFeelDecorated(true);

LoginFrm frm=new LoginFrm();

frm.setSize(400,200);

frm.setVisible(true);

}

}

java編寫一個(gè)登陸和注冊(cè)信息的源代碼,最簡(jiǎn)單的就可以,不需要數(shù)據(jù)庫(kù)的那種

你這個(gè)不用數(shù)據(jù)庫(kù)真的是有點(diǎn)難搞

我寫了個(gè)用集合存儲(chǔ)的，你看看，能否幫上你

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

list.add("qq=123");//存儲(chǔ)的時(shí)候用（用戶名=密碼）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("登錄成功");

break;

}

}


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轉(zhuǎn)載來(lái)于：http://weahome.cn/article/dopgsei.html

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