Java实现简单登陆界面（java用户登陆界面）-eolink官网

Java实现简单登陆界面（java用户登陆界面）

利用java连接mysql做登陆界面，供大家参考，具体内容如下

1、首先需要建立一个类，在这里，我命名为newLogin

newLogin类的代码如下

package p4;

import java.awt.Dimension;

import java.awt.Font;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import javax.swing.ButtonGroup;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPasswordField;

import javax.swing.JRadioButton;

import javax.swing.JTextField;

public class newLogin extends JFrame implements ActionListener{

private static final long serialVersionUID = 1L;

private Connection con = null;

private Statement statement = null;

private ResultSet res = null;

private ButtonGroup buttongroup = new ButtonGroup();

private MyPanel jp = new MyPanel();

private JLabel ul = new JLabel("用户名：");

private JLabel pl = new JLabel("密码：");

private JLabel ts = new JLabel("");

private JTextField uname = new JTextField();

private JPasswordField pword = new JPasswordField();

private JRadioButton[] butArray = {

new JRadioButton("学生",true),

new JRadioButton("教师")

};

private JButton login = new JButton("登陆");

private JButton reset = new JButton("重置");

public newLogin() {

addListener();

initialFrame();

}

private void initialFrame() {

Font font = new Font("宋体",Font.BOLD,12);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setTitle("登陆");

jp.setLayout(null);

ul.setBounds(100, 30, 60, 30);

jp.add(ul);

uname.setBounds(170, 30, 140, 30);

jp.add(uname);

pl.setBounds(100, 80, 60, 30);

pword.setBounds(170, 80, 140, 30);

jp.add(pl);

jp.add(pword);

ts.setBounds(100, 160, 200, 50);

jp.add(ts);

ts.setFont(font);

jp.add(login);

reset.setBounds(220, 220, 70, 30);

jp.add(reset);

reset.setFont(font);

add(jp);

setResizable(false);

buttongroup.add(butArray[0]);

buttongroup.add(butArray[1]);

butArray[0].setBounds(120, 130, 100, 50);

jp.add(butArray[0]);

butArray[1].setBounds(220, 130, 100, 50);

jp.add(butArray[1]);

butArray[0].setContentAreaFilled(false);

butArray[1].setContentAreaFilled(false);

Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

int centerX = screenSize.width/2;

int centerY = screenSize.height/2;

int w = 427;

int h = 331;

setBounds(centerX-w/2, centerY-h/2, w, h);

setVisible(true);

uname.requestFocus(true);

getContentPane().add(jp);

jp.getRootPane().setDefaultButton(login);

}

private void addLishttp://tener() {

this.login.addActionListener(this);

this.uname.addActionListener(this);

this.pword.addActionListener(this);

}

@Override

public void actionPerformed(ActionEvent e) {

if(e.getSource() == uname) {

pword.requestFocus();

}

if(e.getSource() == pword) {

butArray[0].requestFocus();

}

if(e.getSource() == butArray[0]||e.getSource() == butArray[1]||e.getSource() == login) {

// this.ts.setText("正在为您努力加载，请稍等......");

int type = this.butArray[0].isSelected()?0:1;

String username = this.uname.getText().trim();

char[] p = this.pword.getPassword();

String password = String.valueOf(p).trim();

if(username.equals("")) {

JOptionPane.showMessageDialog(this, "请输入用户名！","错误",JOptionPane.ERROR_MESSAGE);

ts.setText("");

return ;

}

if(password.equals("")) {

JOptionPane.showMessageDialog(this, "请输入密码！","错误",JOptionPane.ERROR_MESSAGE);

ts.setText("");

return ;

}

try {

con = new connection().getConnection(); //调用自己写的一个数据库连接类

statement = con.createStatement();

if(type == 0) {

String sql = "select * from stuuser where "+

"username_stu='"+username+"'and password_stu='"+password+"'";

res = statement.executeQuery(sql);

if(res.next()) {

JOptionPane.showMessageDialog(this, "登录成功！","提示",JOptionPane.INFORMATION_MESSAGE);

this.dispose();

}

else {

JOptionPane.showMessageDialog(this, "用户名或密码错误！","错误",JOptionPane.ERROR_MESSAGE);

ts.setText("");

uname.setText("");

pword.setText("");

}

//关闭数据库连接

if(res != null) {

res.close();

}

if(statement != null) {

statement.close();

}

if(con != null) {

con.close();

}

else {

String sql = "select * from teauser where "+

"username_tea='"+username+"'and password_tea='"+password+"'";

res = statement.executeQuery(sql);

if(res.next()) {

String spec_name = res.getString(1);

JOptionPane.showMessageDialog(this, "登录成功！","提示",JOptionPane.INFORMATION_MESSAGE);

this.dispose();

}

else {

JOptionPane.showMessageDialog(this, "用户名或密码错误！","错误",JOptionPane.ERROR_MESSAGE);

ts.setText("");

uname.setText("");

pword.setText("");

}

//关闭数据库连接

if(res != null) {

res.close();

}

if(statement != null) {

statement.close();

}

if(con != null) {

con.close();

}

}catch(SQLException ea) {

ea.printStackTrace();

}

else if(e.getSource() == reset) {

uname.setText("");

pword.setText("");

}

2、编写数据库连接类，在这里命名为connection,然后在类里写一个获取连接的放回，并返回一个连接。

connection类的代码如下：

package p4;

import java.sql.Connection;

import java.sql.DriverManager;

//import java.sql.ResultSet;

import java.sql.SQLException;

//import java.sql.Statement;

public class connection {

private Connection con = null;

// private Statement statement = null;

// private ResultSet res = null;

String driver = "com.mysql.cj.jdbc.Driver";

String url = "jdbc:mysql://localhost:3306/Stu_manager?serverTimezone=Asia/Shanghai";

String name = "root";

String passwd = "123456";

public connection() {

}

public Connection getConnection() {

try{

Class.forName(driver).newInstance();

con = DriverManager.getConnection(url,name,passwd);

}catch(ClassNotFoundException e){

System.out.println("对不起，找不到这个Driver");

e.printStackTrace();

}catch(SQLException e){

e.printStackTrace();

}catch(Exception e){

e.printStackTrace();

}

return con;

}

3、在MySQL数据库中需建立两个用户表，分别用来存储不同用户的登陆账号和密码，这里学生用户表为stuuser,教师用户表为teauser,建表的SQL语句如下:

stuuser表：

create table stuuser(

username_stu varchar(20) primary key,

password_stu char(20) not null,

)ENGINE=InnoDB DEFAULT CHARSET=utf8;

teauser表：

create table teauser(

username_tea varchar(20) primary key,

password_tea char(20) not null,

)ENGINE=InnoDB DEFAULT CHARSET=utf8;

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