import java.awt.*;
import java.awt.event.*;
import java.util.Arrays;
import javax.swing.*;
import javax.swing.border.EmptyBorder;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
 
public class register extends JFrame {
	private JPanel contentPane;
	private JTextField textField;
	private JPasswordField passwordField1;
	private JPasswordField passwordField2;
 
	public static void main(String[] args) {
		register frame = new register();
		frame.setLocationRelativeTo(frame.getOwner());
		frame.getContentPane().setBackground(Color.white);
		frame.setVisible(true);
	}
 
	public register() {
		setTitle("用户注册");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(500, 500, 750, 550);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(15, 15, 15, 15));
		setContentPane(contentPane);
		contentPane.setLayout(new GridLayout(5, 1, 5, 5));
 
		JPanel panel1 = new JPanel();
		contentPane.add(panel1);
 
		JLabel label1 = new JLabel("新用户注册");
		label1.setFont(new Font("宋体", 0, 33));
		panel1.add(label1);
		panel1.setBackground(Color.white);
		
		JPanel panel2 = new JPanel();
		panel2.setLayout(new FlowLayout(FlowLayout.CENTER));
		contentPane.add(panel2);
		JLabel label2 = new JLabel("用 户 名  ");
		panel2.add(label2);
		label2.setFont(new Font("宋体", 0, 30));
		panel2.setBackground(Color.white);
		textField = new JTextField();
		textField.setFont(new Font("宋体", 0, 27));
		panel2.add(textField);
		textField.setColumns(23);
 
		JPanel panel3 = new JPanel();
		panel3.setLayout(new FlowLayout(FlowLayout.CENTER));
		contentPane.add(panel3);
		JLabel label3 = new JLabel("密    码  ");
		label3.setFont(new Font("宋体", 0, 30));
		panel3.add(label3);
		panel3.setBackground(Color.white);
		passwordField1 = new JPasswordField();
		passwordField1.setFont(new Font("宋体", 0, 27));
		passwordField1.setColumns(23);
		panel3.add(passwordField1);
 
		JPanel panel4 = new JPanel();
		panel4.setLayout(new FlowLayout(FlowLayout.CENTER));
		contentPane.add(panel4);
		JLabel label4 = new JLabel("确认密码  ");
		label4.setFont(new Font("宋体", 0, 30));
		panel4.add(label4);
		panel4.setBackground(Color.white);
		passwordField2 = new JPasswordField();
		passwordField2.setFont(new Font("宋体", 0, 27));
		passwordField2.setColumns(23);
		panel4.add(passwordField2);
 
		JPanel panel5 = new JPanel();
		contentPane.add(panel5);
		JButton button = new JButton("提交");
		button.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				registerActionPerformed(e);
			}
		});
		button.setFont(new Font("宋体", 0, 27));
		panel5.add(button);
		panel5.setBackground(Color.white);
	}
 
	protected void registerActionPerformed(ActionEvent e) {
		String filePath = "D://123.txt";
		File file = new File(filePath);
		boolean flag = true;
		String s = " ",str = null;
		String userName = textField.getText();
		String password1=new String(passwordField1.getPassword());
		String password2=new String(passwordField2.getPassword());
		//char[] password1 = passwordField1.getPassword();// 获得密码框1中的密码
		//char[] password2 = passwordField2.getPassword();// 获得密码框2中的密码
		try {
			if (!file.exists())
				file.createNewFile();
			FileReader fr = new FileReader(file); // 创建文件输输入流
			BufferedReader in = new BufferedReader(fr); // 使用缓冲区数据流封装输入流
			FileWriter fw = new FileWriter(file,true); // 创建文件输出流
			BufferedWriter bw = new BufferedWriter(fw); // 使用缓冲区数据流封装输出流
			if (password1.equals(password2)) {// 如果密码相同则提示注册成功
				while ((str = in.readLine()) != null) {
					 String[] data = str.split(" ");
	                if(data[0].equals(userName)){
	                	flag = false;
	                    break;
	                }
				}
				if(flag==false)
					JOptionPane.showMessageDialog(this, "用户名重复", null,JOptionPane.WARNING_MESSAGE);
				else if(password1==null||password1.length()==0)
					JOptionPane.showMessageDialog(this, "密码不能为空", null,JOptionPane.WARNING_MESSAGE);
				else if(userName.contains(s))
					JOptionPane.showMessageDialog(this, "用户名不能包含空格", null,JOptionPane.WARNING_MESSAGE);
				else if(Arrays.asList(password1).contains(s))
					JOptionPane.showMessageDialog(this, "密码不能包含空格", null,JOptionPane.WARNING_MESSAGE);
				else {
					JOptionPane.showMessageDialog(this, "用户注册成功！", null,JOptionPane.INFORMATION_MESSAGE);
					bw.write(userName+" "+password1+" ");// 写入数据到输出流
					bw.newLine(); // 写入换行符
					bw.flush(); // 刷新缓冲区
					this.dispose();
				}
				
			} else {// 如果密码不同则提示密码不同
				JOptionPane.showMessageDialog(this, "两次密码不同！", null,JOptionPane.WARNING_MESSAGE);
				passwordField2.setText("");
			}

		} catch (IOException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
	}
}