package addresslist;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.border.EmptyBorder;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
/*
* 封装的太差啦！
* 要好好理解继承封装多态的使用
* 不然代码就没法看了
* 其实是后期修改太困难啦
* 通用模版的使用
* 代码的可复用性
* 考虑好了之后再动手敲代码
* 不然写了维护起来也比较困难最后只好放弃
*
* 然后就是代码的重构与优化
*
*/
public class login extends JFrame {
private JPanel contentPane;
private JTextField textField;
private JPasswordField passwordField;
public Judge judge=new Judge();
static String username;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
JFrame fra = new login();
fra.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public void setall(String n,String p){
textField.setText(n);
passwordField.setText(p);
}
public login() {
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new NewPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
JLabel label = new JLabel("\u7528\u6237\u540D");
textField = new JTextField();
textField.setColumns(10);
JLabel label_1 = new JLabel("*");
textField.addFocusListener(new FocusAdapter() {
@Override
public void focusLost(FocusEvent e) {
try {
String s=textField.getText().toString();
if(!judge.exist(s)){
label_1.setText("no such nickname!");
}
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
@Override
public void focusGained(FocusEvent e) {
label_1.setText("*");
}
});
JLabel label_2 = new JLabel("\u5BC6\u7801");
passwordField = new JPasswordField();
JButton btnLogin = new JButton("login");
btnLogin.addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
if(e.getKeyCode()==10){
btnLogin.doClick();
}
}
});
btnLogin.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String s=new String(passwordField.getPassword());
String n=textField.getText().toString();
try {
if(judge.canlogin(n,s)){
username=n;
mainFrame frame=new mainFrame();
frame.setVisible(true);
dispose();
}
else{
JOptionPane.showMessageDialog(null, "密码或用户名错误");
}
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
});
JButton btnRegister = new JButton("register");
btnRegister.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
register rs=new register();
rs.setVisible(true);
}
});
GroupLayout gl_contentPane = new GroupLayout(contentPane);
gl_contentPane.setHorizontalGroup(
gl_contentPane.createParallelGroup(Alignment.LEADING)
.addGroup(gl_contentPane.createSequentialGroup()
.addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING)
.addGroup(gl_contentPane.createSequentialGroup()
.addGap(66)
.addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING)
.addComponent(label)
.addComponent(label_2))
.addGap(18)
.addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING, false)
.addComponent(passwordField)
.addComponent(textField, GroupLayout.DEFAULT_SIZE, 107, Short.MAX_VALUE))
.addGap(28)
.addComponent(label_1))
.addGroup(gl_contentPane.createSequentialGroup()
.addGap(80)
.addComponent(btnLogin)
.addGap(37)
.addComponent(btnRegister)))
.addContainerGap(151, Short.MAX_VALUE))
);
gl_contentPane.setVerticalGroup(
gl_contentPane.createParallelGroup(Alignment.LEADING)
.addGroup(gl_contentPane.createSequentialGroup()
.addGap(48)
.addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING)
.addComponent(label)
.addGroup(gl_contentPane.createParallelGroup(Alignment.TRAILING)
.addComponent(label_1)
.addComponent(textField, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)))
.addGap(29)
.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
.addComponent(label_2)
.addComponent(passwordField, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
.addGap(48)
.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
.addComponent(btnLogin)
.addComponent(btnRegister))
.addContainerGap(61, Short.MAX_VALUE))
);
contentPane.setLayout(gl_contentPane);
}
class NewPanel extends JPanel{
public NewPanel() {}
public void paintComponent(Graphics g)
{
int x=0,y=0;
java.net.URL imgURL=getClass().getResource("login.jpg");
//test.jpg是测试图片，与Demo.java放在同一目录下
ImageIcon icon=new ImageIcon(imgURL);//this is really useful
g.drawImage(icon.getImage(),x,y,getSize().width,getSize().height,this);
while(true)
{
g.drawImage(icon.getImage(),x,y,this);
if(x>getSize().width && y>getSize().height)break;
//这段代码是为了保证在窗口大于图片时，图片仍能覆盖整个窗口
if(x>getSize().width)
{
x=0;
y+=icon.getIconHeight();
}
else
x+=icon.getIconWidth();
}
}
}
}
package addresslist;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.JPasswordField;
import javax.swing.JButton;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class register extends JFrame {
private JPanel contentPane;
private JTextField textField;
private JPasswordField passwordField;
private JPasswordField passwordField_1;
public Judge judge=new Judge();
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
register frame = new register();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public register() {
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
JLabel label = new JLabel("\u7528\u6237\u540D");
textField = new JTextField();
textField.setColumns(10);
JLabel label_1 = new JLabel("*");
textField.addFocusListener(new FocusAdapter() {
@Override
public void focusGained(FocusEvent e) {
label_1.setText("*");
}
@Override
public void focusLost(FocusEvent e) {
try {
if(!judge.exist(textField.getText().toString())){
label_1.setText("is valiable");
}
else{
label_1.setText("the name is used!");
}
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
});
JLabel label_2 = new JLabel("\u5BC6\u7801");
passwordField = new JPasswordField();
JLabel label_3 = new JLabel("\u786E\u8BA4\u5BC6\u7801");
passwordField_1 = new JPasswordField();
JLabel label_4 = new JLabel("*");
passwordField_1.addFocusListener(new FocusAdapter() {
@Override
public void focusGained(FocusEvent e) {
label_4.setText("*");
}
@Override
public void focusLost(FocusEvent e) {
if(new String(passwordField.getPassword()).equals(new String(passwordField_1.getPassword()))){
label_4.setText("*");
}
else{
label_4.setText("the password is not the same,please check it!");
}
}
});
JButton btnRegister = new JButton("register");
btnRegister.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
if(!judge.exist(textField.getText().toString())){
String n=textField.getText().toString();
String p=new String(passwordField.getPassword());
judge.regist(n,p);
login lg=new login();
lg.setVisible(true);
lg.setall(n,p);
dispose();
}
else{
JOptionPane.showMessageDialog(null, "the name is exist please try another!");
}
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
});
GroupLayout gl_contentPane = new GroupLayout(contentPane);
gl_contentPane.setHorizontalGroup(
gl_contentPane.createParallelGroup(Alignment.LEADING)
.addGroup(gl_contentPane.createSequentialGroup()
.addGap(39)
.addGroup(gl_contentPane.createParallelGroup(Alignment.TRAILING)
.addComponent(btnRegister)
.addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING, false)
.addGroup(gl_contentPane.createSequentialGroup()
.addGap(47)
.addGroup(gl_contentPane.createParallelGroup(Alignment.TRAILING)
.addComponent(label_2)
.addComponent(label))
.addGap(18)
.addGroup(gl_contentPane.createParallelGroup(Alignment.TRAILING, false)
.addComponent(passwordField)
.addComponent(textField, GroupLayout.DEFAULT_SIZE, 100, Short.MAX_VALUE)))
.addGroup(gl_contentPane.createSequentialGroup()
.addGap(39)
.addComponent(label_3)
.addGap(18)
.addComponent(passwordField_1))))
.addGap(18)
.addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING)
.addComponent(label_1)
.addComponent(label_4))
.addContainerGap(199, Short.MAX_VALUE))
);
gl_contentPane.setVerticalGroup(
gl_contentPane.createParallelGroup(Alignment.LEADING)
.addGroup(gl_contentPane.createSequentialGroup()
.addGap(46)
.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
.addComponent(label)
.addComponent(textField, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
.addComponent(label_1))
.addGap(18)
.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
.addComponent(label_2)
.addComponent(passwordField, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
.addGap(26)
.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
.addComponent(label_3)
.addComponent(passwordField_1, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
.addComponent(label_4))
.addGap(34)
.addComponent(btnRegister)
.addContainerGap(41, Short.MAX_VALUE))
);
contentPane.setLayout(gl_contentPane);
}
}
package addresslist;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class Judge {
public static void main(String[] args) throws Exception {
String url ="jdbc:mysql://localhost:3306/login"; //数据库连接字符串
Class.forName("org.gjt.mm.mysql.Driver").newInstance(); //加载驱动程序
Connection conn= (Connection) DriverManager.getConnection(url,"tan","tn5201314"); //建立连接
Statement stmt=(Statement) conn.createStatement(); //创建SQL容器
String sql="select * from user"; //表为teacher
ResultSet rs=stmt.executeQuery(sql); //获得结果集
while( rs.next() ) { //处理结果集
System.out.print(rs.getString("name")+" ");
System.out.print(rs.getString("password")+"\n");
}
rs.close(); stmt.close(); conn.close(); //关闭次序
}
public Connection getConnection()throws Exception{
String url ="jdbc:mysql://localhost:3306/login"; //数据库连接字符串
Class.forName("org.gjt.mm.mysql.Driver").newInstance(); //加载驱动程序
Connection conn= DriverManager.getConnection(url,"tan","tn5201314");
return conn;
}
public boolean exist(String s) throws Exception{
Connection conn= getConnection(); //建立连接
Statement stmt=conn.createStatement(); //创建SQL容器
String sql="select * from user where name='"+s+"'"; //表为user
ResultSet rs=stmt.executeQuery(sql); //获得结果集
if( rs.next() ) {
rs.close(); stmt.close(); conn.close();
return true;
}
else
{
rs.close(); stmt.close(); conn.close();
return false;
}
//关闭次序
}
public boolean canlogin(String n,String p) throws Exception{
Connection conn=getConnection(); //建立连接
Statement stmt=conn.createStatement(); //创建SQL容器
String sql="select password from user where name='"+n+"'"; //表为user
ResultSet rs=stmt.executeQuery(sql); //获得结果集
if(rs.next()){
if(rs.getString("password").equals(p)){
rs.close(); stmt.close(); conn.close();
return true;
}
else{
rs.close(); stmt.close(); conn.close();
return false;
}
}
else{
rs.close(); stmt.close(); conn.close();
return false;
}
}
public void regist(String n,String p) throws Exception{
Connection conn=getConnection(); //建立连接
Statement stmt=conn.createStatement(); //创建SQL容器
String sql="insert into user values('"+n+"','"+p+"')"; //表为user
stmt.executeUpdate(sql);
stmt.close(); conn.close();
}
}
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