關于java的InetAddress連接

package ZY;

import java.sql.Statement;

import javax.naming.spi.DirStateFactory.Result;

import java.net.Inet4Address;

import java.net.InetAddress;

import java.net.UnknownHostException;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

public class Connecting {// 連接類

public static boolean Yanzheng(String username, String password) {// 此方法驗證賬號和密碼

// 輸入用戶名和密碼進行驗證！

// 返回布爾類型

boolean flag = false;

try {

Class.forName("com.mysql.jdbc.Driver");

Connection cons = DriverManager.getConnection("jdbc:mysql://localhost:3306/java", "root", "123456");

Statement st = cons.createStatement();

ResultSet count = st.executeQuery("select * from user where user='" + username + "' and pass='" + password + "';");

flag = count.next();

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

System.out.println("未知驗證錯誤");

}

// System.out.println(flag);

return flag;//返回值false

}

public static void addInfoData(String username, String password) {// 向數據庫添加數據

try {

Class.forName("com.mysql.jdbc.Driver");

Connection cons = DriverManager.getConnection("jdbc:mysql://localhost:3306/java", "root", "123456");

Statement st = cons.createStatement();

// int count=st.executeUpdate("insert into info

// values(null,"+username+","+password+")");

int count = st.executeUpdate("insert into user values('" + username + "','" + password + "')");

System.out.println(count);

} catch (Exception e) {

// TODO Auto-generated catch block

// System.out.println("未知錯誤");

}

}

}

package ZY;

import java.awt.Color;

import java.awt.Container;

import java.awt.Cursor;

import java.awt.FlowLayout;

import java.awt.Font;

import java.awt.Image;

import java.awt.Panel;

import java.awt.TextField;

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 javax.swing.ImageIcon;

import javax.swing.JButton;

import javax.swing.JCheckBox;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JPasswordField;

import javax.swing.JRootPane;

import javax.swing.JTextField;

public class EnterWindow extends JFrame {

public static boolean yan = false;

public static RegisterWindow rw;

private Panel mp = new Panel();

private JLabel user;//JLabel標簽

private JLabel pass;//JLabel標簽

private TextField tf1;//文本框

private JPasswordField tf2;//密碼框

//定義按鈕

private JButton StartButton;

private JButton registerButton;

public EnterWindow() {

this.setTitle("登錄界面");

mp.setBounds(200, 200, 380, 280);//定義起始位置和大小

this.setBounds(200, 200, 380, 280);

this.setResizable(false);//固定窗口大小不可拖動

this.add(mp);

mp.setBackground(Color.white);

mp.setLayout(null);

init();

//窗體的監聽事件

this.addWindowListener(new WindowAdapter() {

@Override

public void windowClosing(WindowEvent e) {

//監聽關閉

// TODO Auto-generated method stub

}

});

}

public void init() {

//相關組件--------------------

user = new JLabel("用戶:");

pass = new JLabel("密碼:");

user.setBounds(80, 45, 32, 16);

pass.setBounds(80, 85, 32, 16);

tf1 = new TextField();

tf2 = new JPasswordField();

tf1.setBounds(120, 40, 200, 25);

tf2.setBounds(120, 80, 200, 25);

StartButton = new JButton("登錄");

registerButton = new JButton("注冊");

StartButton.setBounds(140, 120, 80, 30);

registerButton.setBounds(240, 120, 80, 30);

mp.add(StartButton);

mp.add(registerButton);

mp.add(user);

mp.add(tf1);

mp.add(pass);

mp.add(tf2);

StartButton.addMouseListener(new MouseAdapter() {

@Override

public void mouseClicked(MouseEvent e) {

String username = new String(tf1.getText());

String password = new String(tf2.getPassword());

if (username.equals("") || password.equals("")) {//判斷賬號密碼是否為空

JOptionPane.showMessageDialog(null, "未檢測到輸入內容！", "information", JOptionPane.ERROR_MESSAGE);

} else {

yan = Connecting.Yanzheng(username, password);//向數據庫發送消息 將賬號和密碼進行驗證處理

//返回值 為true 和false

}

if (yan == true) {

JOptionPane.showMessageDialog(null, "登錄成功", "information", JOptionPane.INFORMATION_MESSAGE);

Example.ex=new Example();

Example.enw.setVisible(false);//設置窗體不可見

} else {

JOptionPane.showMessageDialog(null, "賬號或者密碼錯誤", "information", JOptionPane.ERROR_MESSAGE);

}

// TODO Auto-generated method stub

}

});

registerButton.addMouseListener(new MouseAdapter() {

@Override

public void mouseClicked(MouseEvent e) {

// TODO Auto-generated method stub

rw=new RegisterWindow();//調用RegisterWindow的構造方法

rw.setVisible(true);

}

});

}

}

package ZY;

import java.awt.Color;

import java.awt.Panel;

import java.awt.TextField;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JPasswordField;

public class RegisterWindow extends JFrame {

public static boolean successful = false;

public static boolean failure = false;

public static boolean registerOpen = false;

Connecting ct2 = new Connecting();

private Panel mp = new Panel();

private JLabel user;

private JLabel pass;

private TextField tf1;

private JPasswordField tf2;

private JButton StartButton;

private JButton registerButton;

public RegisterWindow() {

this.setTitle("注冊界面");

mp.setBounds(400, 400, 380, 280);

this.setBounds(400, 400, 380, 280);

this.setResizable(false);

this.add(mp);

mp.setBackground(Color.orange);

// this.setLayout(null);

mp.setLayout(null);

init();

this.addWindowListener(new WindowAdapter() {

@Override

public void windowClosing(WindowEvent e) {

// TODO Auto-generated method stub

// JOptionPane.showMessageDialog(null, "不要在這里點X", "information",

// JOptionPane.ERROR_MESSAGE);

}

});

}

public void init() {

user = new JLabel("用戶:");

pass = new JLabel("密碼:");

user.setBounds(80, 45, 32, 16);

pass.setBounds(80, 85, 32, 16);

tf1 = new TextField();

tf2 = new JPasswordField();

tf1.setBounds(120, 40, 200, 25);

tf2.setBounds(120, 80, 200, 25);

registerButton = new JButton("提交");

registerButton.setBounds(180, 120, 80, 30);

mp.add(registerButton);

mp.add(user);

mp.add(tf1);

mp.add(pass);

mp.add(tf2);

registerButton.addMouseListener(new MouseAdapter() {

@Override

public void mouseClicked(MouseEvent e) {

// TODO Auto-generated method stub

@SuppressWarnings("deprecation")

String username = new String(tf1.getText());

String password = new String(tf2.getPassword());

if (username.equals("") && !password.equals("")) {

JOptionPane.showMessageDialog(null, "未檢測到用戶名輸入", "information", JOptionPane.ERROR_MESSAGE);

} else if (!username.equals("") && password.equals("")) {

JOptionPane.showMessageDialog(null, "未檢測到密碼輸入", "information", JOptionPane.ERROR_MESSAGE);

} else if (username.equals("") && password.equals("")) {

JOptionPane.showMessageDialog(null, "請輸入內容??！", "information", JOptionPane.ERROR_MESSAGE);

} else {

Connecting.addInfoData(username, password);

}

if (registerOpen == true) {

JOptionPane.showMessageDialog(null, "此用戶已存在 請重新注冊", "information", JOptionPane.ERROR_MESSAGE);

System.exit(0);

// EnterWindow.successful=true;

} else if (!username.equals("") && !password.equals("")) {

JOptionPane.showMessageDialog(null, "注冊成功", "information", JOptionPane.INFORMATION_MESSAGE);

EnterWindow.rw.setVisible(false);

}

}

});

}

}