package 登录
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("登陆界面")
frame.setBounds(100, 100, 450, 300)
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
frame.getContentPane().setLayout(null)
frame.setResizable(false)
JLabel lblNewLabel = new JLabel("用户名")
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 码")
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 录")
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) //有此用户
{
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 登录
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 操作处理.UsersCL
/**@author 20111024
* 检测登录的用户在数据库中有无，若没有，则提示没有此用户，
* 若有，则判断级别：普通用户还是管理员。
*/
public class UserCheck {
private int i=0 //用户级别:0不是用户、1是管理员、2是普通用户
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())
{
//数据库中有此用户，访问成功
i=Integer.parseInt(rs.getString(3))
UsersCL UL=new UsersCL(i)
}
else
{
i=0 //没有用户是默认是0级
}
} 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 操作处理
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("用户处理界面")
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("学 号")
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 龄")
label_1.setBounds(24, 110, 74, 29)
frame.getContentPane().add(label_1)
label_3 = new JLabel("性 别")
label_3.setBounds(24, 149, 74, 29)
frame.getContentPane().add(label_3)
JLabel label_2 = new JLabel("状 态")
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("删 除")
button_1.setBounds(276, 145, 113, 29)
frame.getContentPane().add(button_1)
button_1.addActionListener(this)
button_1.setActionCommand("删除")
}
JButton button = new JButton("查 询")
button.setBounds(276, 91, 113, 29)
frame.getContentPane().add(button)
button.addActionListener(this)
button.setActionCommand("查询")
}
@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("查询"))
{
query="select * from students where XSB="+num+""
count=2
}
else if(e.getActionCommand().equals("删除"))
{
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("已经由此记录，不能追加！")
else
{
stmt.executeUpdate(query)
textField_3.setText("已经追加完成！")
}
}
else if(2==count)
{
stmt.executeQuery(query)
rs=stmt.executeQuery(query)
if(rs.next())
{
textField_3.setText("已查找到此记录！")
}
else
{
textField_3.setText("没有此记录，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("已删除此记录！")
}
else
textField_3.setText("无此记录！")
}
} catch (ClassNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace()
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace()
}
finally{
//关闭资源
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
}
}
}
}
简单代码如下，原本想用弹窗的，懒得写了：
import java.awt.Containerimport java.awt.FlowLayout
import java.awt.GridLayout
import java.awt.event.ActionEvent
import java.awt.event.ActionListener
import javax.swing.JButton
import javax.swing.JFrame
import javax.swing.JLabel
import javax.swing.JTextField
public class dengru extends JFrame implements ActionListener {
private static final long serialVersionUID = 1L
private Container c = null
private JButton jb = null
public dengru() {
this.setLayout(new FlowLayout())
jb = new JButton("登入")
jb.addActionListener(this)
this.add(jb)
this.setSize(500, 400)
this.setVisible(true)
this.setDefaultCloseOperation(DISPOSE_ON_CLOSE)
}
public static void main(String[] args) {
new dengru()
}
@Override
public void actionPerformed(ActionEvent e) {
if (e.getSource() == jb) {
JFrame jf=new JFrame()
c = jf.getContentPane()
c.setLayout(new GridLayout(3,2,2,2))
JLabel jl1 = new JLabel("用户名：")
JLabel jl2 = new JLabel("密 码：")
JTextField jtf1 = new JTextField()
JTextField jtf2 = new JTextField()
jtf1.setSize(200, 40)
jtf2.setSize(200, 40)
c.add(jl1)
c.add(jtf1)
c.add(jl2)
c.add(jtf2)
c.add(new JButton("登入"))
jf.setVisible(true)
jf.setSize(300, 100)
jf.setDefaultCloseOperation(DISPOSE_ON_CLOSE)
}
}
}
ResultSet rs=sql.executeQuery("select * from User_Table where user_name='" +jtf_user.getText() +"'and " +"user_password='"+jtf_password.getText()+"'")
if(rs.hasnext()){
JOptionPane.showMessageDialog(jp2, "登录成功", "提示", JOptionPane.INFORMATION_MESSAGE)
System.out.println("yonghu")
}
