设计一个登录窗口，点击“登录”按钮时，将用户输入的信息写入到磁盘中的某个路径下文件中

综合利用IO流和GUI图形用户界面知识，设计一个登录窗口，当用户在文本框中输入用户名和密码信息，点击“登录”按钮时，将用户输入的信息写入到磁盘中的某个路径下的user.txt文件中。当用户点击“显示”按钮时，将user.txt中的信息读取后放在一个文本区中显示出来。

package com.test;

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Font;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

public class Exap6_4 extends JFrame {
    // 窗口参数设置
    public void home() {
        Container c = this.getContentPane();
        JTextField account = new JTextField();
        JPasswordField password = new JPasswordField();
        JButton record = new JButton("登录");
        JButton register = new JButton("显示");
        JTextField show = new JTextField("显示账号密码");

        this.setTitle("窗口");
        int width = Toolkit.getDefaultToolkit().getScreenSize().width;
        int height = Toolkit.getDefaultToolkit().getScreenSize().height;
        this.setBounds(width / 2 - 200, height / 2 - 220, 650, 650);
        c.setLayout(new BorderLayout());
        this.setResizable(false);
        this.setVisible(true);
        this.validate();
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);

        JPanel jpanel = new JPanel();
        jpanel.setLayout(null);
        JLabel Bank = new JLabel("银行");
        Bank.setFont(new Font("宋体", Font.PLAIN, 30));

        jpanel.add(Bank);
        Bank.setBounds(280, 10, 100, 30);
        c.add(jpanel, "North");

        ImageIcon ii = new ImageIcon("D:\\Example6\\src\\com\\test\\1.jpg");
        ii.setImage(ii.getImage().getScaledInstance(150, 150, Image.SCALE_DEFAULT));
        JLabel a3 = new JLabel(ii);
        a3.setBounds(240, 50, 150, 150);
        c.add(a3);

        JLabel a1 = new JLabel("账号:");
        a1.setFont(new Font("宋体", Font.PLAIN, 20));
        a1.setBounds(180, 280, 50, 20);
        JLabel a2 = new JLabel("密码:");
        a2.setFont(new Font("宋体", Font.PLAIN, 20));
        a2.setBounds(180, 360, 50, 20);
        jpanel.add(a1);
        jpanel.add(a2);
        account.setBounds(280, 275, 150, 30);
        account.setFont(new Font("宋体", Font.PLAIN, 18));

        password.setBounds(280, 355, 150, 30);
        password.setFont(new Font("宋体", Font.PLAIN, 18));

        jpanel.add(account);
        jpanel.add(password);
        c.add(jpanel, "Center");

        jpanel.add(register);
        register.setBounds(15, 550, 200, 40);
        register.setFont(new Font("宋体", Font.PLAIN, 15));
        jpanel.add(show);
        show.setBounds(190, 430, 300, 75);
        show.setFont(new Font("宋体", Font.PLAIN, 15));
        c.add(jpanel);

        jpanel.add(record);
        record.setBounds(400, 550, 200, 40);
        record.setFont(new Font("宋体", Font.PLAIN, 20));
        c.add(jpanel);
        
        record.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String a1 = account.getText()+"<-show password->"+password.getText();
                try {
                    xieru(a1);
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        });
        register.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
            	show.setText(duqu());
            }
        });
    }
    public void xieru(String ac) throws IOException {
        File file=new File("D:\\Example6\\src\\com\\test\\user.txt");
        if(!file.exists()){
            file.createNewFile();
        }
        FileWriter wr=new FileWriter(file);
        try{
            wr.write(ac);
            wr.flush();

        }catch(IOException e){
            e.printStackTrace();
        }
        if(wr!=null){
            wr.close();
        }
    }
    public String  duqu ()  {
        String result = "";
        File file = new File("D:\\Example6\\src\\com\\test\\user.txt");
        try {
            InputStreamReader reader = new InputStreamReader(new FileInputStream(file),"gbk");
            BufferedReader br = new BufferedReader(reader);
            String s = null;
            while((s=br.readLine())!=null){
                result = result  + s;
            }
        } catch (UnsupportedEncodingException | FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }
    public static void main(String[] args) {
        Exap6_4 fuck = new Exap6_4();
        fuck.home();
    }
}

一个小代码，只供参考

本文地址：https://blog.csdn.net/qq_52581566/article/details/110834341