java简单界面的注册功能——数据库实现
有关数据库方面的操作本次不打算讲了，不懂的可以看本人的上一次的技术博客。今天给大家带来的是本人自己思索过后对数据库的基本使用。只是简单的记录了自己的学习过程和经历，好了，言归正传。我这次是做了一个简单的界面：
中间的区域是使用JList做的，实现了点击删除数据。
接下来是代码了：
package ctong;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
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 java.util.ArrayList;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JOptionPane;
import javax.swing.JRootPane;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
/**
* 1.增加数据-insert into game(name,type) values(?,?)
* public void dd2Table(String name,String type);
* public void add2Table(String name,String type,int id);
* 2.删除数据-delete from game where id = ?
* public void DelData(int id)
* 3.查找数据-select * from game
* public void SelectTables()
* 4.修改数据-update game set name=?,type=? where id=?
* public void upData(String name,String type,int id)
*
*
*
* @author ctong
*
*/
public class Mysql {
private JTextField field1,field2;
private ArrayList<String> arrayList=new ArrayList<String>();
/*
数据库加载固定属性
*/
//mySql 中驱动类的名字就是其驱动包中的com.mysql.jdbc.Driver.class 类。
String driver="com.mysql.jdbc.Driver";
Connection con;
//jdbc:mysql://ip 地址: 端口号/数据库名字
String url="jdbc:mysql://localhost:3306/ctong";
String user="root";
//连接上数据库mysql
public void connection2MYSQL()
{
try {
Class.forName(driver);
//第三个属性是密码
con=DriverManager.getConnection(url,user,"");
if(!con.isClosed())
System.out.println("连接成功");
} catch (Exception e) {
e.printStackTrace();
}
}
//在表末增加一栏数据
public void add2Table(String zhanghao,String mima)
{
try {
//预处理命令添加
PreparedStatement sql;
sql = con.prepareStatement("insert into QQ(zhanghao,mima) values(?,?)");
sql.setString(1,zhanghao);
sql.setString(2,mima);
sql.executeUpdate();
} catch (Exception e) {
e.printStackTrace();
}
}
//增加一栏数据-----指定id
public void add2Table(String zhanghao,String mima,int id)
{
try {
//预处理命令添加
PreparedStatement sql;
sql = con.prepareStatement("insert into QQ(zhanghao,mima,id) values(?,?,?)");
sql.setString(1,zhanghao);
sql.setString(2,mima);
sql.setInt(3, id);
sql.executeUpdate();
} catch (Exception e) {
e.printStackTrace();
}
}
//查找表中所有数据
public void SelectTables(){
boolean flag = false;
try {
// 执行sql语句
Statement statement = con.createStatement();
String sql = "select * from QQ";
ResultSet rs = statement.executeQuery(sql);
String zhanghao = "";
String mima = "";
int id;
while (rs.next()) {
zhanghao = rs.getString("zhanghao");
mima = rs.getString("mima");
id=rs.getInt("id");
System.out.println("zhanghao =" + zhanghao + " mima=" + mima+" id="+id);
if(zhanghao.equals(field1.getText())&&mima.equals(field2.getText())){
flag=true;
JOptionPane.showMessageDialog(null, "成功登陆");
}
}
if(!flag)
JOptionPane.showMessageDialog(null, "登陆失败");
rs.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public boolean SelectTables2(){
boolean flag = false;
try {
// 执行sql语句
Statement statement = con.createStatement();
String sql = "select * from QQ";
ResultSet rs = statement.executeQuery(sql);
String zhanghao = "";
while (rs.next()) {
zhanghao = rs.getString("zhanghao");
if(zhanghao.equals(field1.getText())){
flag=true;
JOptionPane.showMessageDialog(null, "注册失败");
return false;
}
}
if(!flag)
JOptionPane.showMessageDialog(null, "注册成功");
rs.close();
} catch (Exception e) {
e.printStackTrace();
}
return true;
}
//删除一行数据
public void DelData(int id)
{
try {
PreparedStatement sql;
sql = con.prepareStatement("delete from QQ where id = ?");
sql.setInt(1,id);
sql.executeUpdate();
} catch (Exception e) {
e.printStackTrace();
}
}
public void DeleteData(String zhanghao)
{
try {
PreparedStatement sql;
sql = con.prepareStatement("delete from QQ where zhanghao = ?");
sql.setString(1,zhanghao);
sql.executeUpdate();
} catch (Exception e) {
e.printStackTrace();
}
}
//修改一栏数据
public void upData(String zhanghao,String mima,int id)
{
try {
PreparedStatement sql;
sql = con.prepareStatement("update QQ set zhanghao=?,mima=? where id=?");
sql.setString(1,zhanghao);
sql.setString(2,mima);
sql.setInt(3, id);
sql.executeUpdate();
} catch (Exception e) {
e.printStackTrace();
}
}
//数据库的关闭
public void close1(){
try {
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
//数据库内容初始化
public Object[] showR(){
try {
// 执行sql语句
Statement statement = con.createStatement();
String sql = "select * from QQ";
ResultSet rs = statement.executeQuery(sql);
String zhanghao = "";
while (rs.next()) {
zhanghao = rs.getString("zhanghao");
arrayList.add(zhanghao);
}
rs.close();
} catch (Exception e) {
e.printStackTrace();
}
return arrayList.toArray();
}
//界面
public void init(){
final JFrame frame = new JFrame("我的界面注册功能");
frame.setSize(500, 500);
frame.setDefaultCloseOperation(0);
frame.setLocationRelativeTo(null);
frame.setResizable(false);
frame.setUndecorated(true);
frame.getRootPane().setWindowDecorationStyle(JRootPane.FRAME);
frame.setLayout(new FlowLayout());
JLabel label1 = new JLabel("账号");
JLabel label2 = new JLabel("密码");
field1 = new JTextField(10);
field2 = new JTextField(10);
JButton button1 = new JButton("登陆");
JButton button2 = new JButton("注册");
final JList list = new JList();
list.setForeground(Color.BLUE);
list.setCursor(new Cursor(12));
list.setBorder(BorderFactory.createTitledBorder("已有的账号"));
list.setListData(showR());
list.setToolTipText("双击删除账号！");
list.setFont(new Font(null, Font.BOLD, 17));
JScrollPane jsp = new JScrollPane(list);
jsp.setPreferredSize(new Dimension(400,400));
frame.add(label1);
frame.add(field1);
frame.add(label2);
frame.add(field2);
frame.add(button1);
frame.add(button2);
frame.add(jsp);
frame.setVisible(true);
button1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(!field1.getText().isEmpty()){
SelectTables();
}else JOptionPane.showMessageDialog(null, "账号密码不能为空");
}
});
button2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(!field1.getText().isEmpty()&&!field2.getText().isEmpty()){
if(SelectTables2()){
add2Table(field1.getText(), field2.getText());
arrayList.add(field1.getText());
list.setListData(arrayList.toArray());
}
}else JOptionPane.showMessageDialog(null, "账号密码不能为空");
}
});
list.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub
if(e.getClickCount()==2){
JOptionPane.showMessageDialog(null, "账号:"+list.getSelectedValue()+"已删除");
DeleteData((String) list.getSelectedValue());
arrayList.remove(list.getSelectedIndex());
list.setListData(showR());
}
}
});
frame.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
int result=JOptionPane.showConfirmDialog(null, "你确定要退出?", "Information", JOptionPane.YES_NO_OPTION);
if(result==JOptionPane.YES_NO_OPTION){
//这里用这个比较合适，因为这样是直接退出程序，而dispose()只关闭窗体，而程序还没结束。
close1();
System.exit(0);
}
}
});
}
//主函数
public static void main(String[] args)
{
Mysql mysql = new Mysql();
mysql.connection2MYSQL();
mysql.init();
}
}