java图形界面（七）---组件综合练习

缺乏、安全感 2023-02-11 04:54 30阅读 0赞

【题目】java图形界面（七）--- 组件综合练习

【时间】2020.05.21 周四

**目录**

七、组件综合练习

7.1 练习-为空判断.

7.2 练习-数字校验.

7.3 练习-账号密码验证.

7.4 练习-黄鹤.

7.5 练习-复利计算器.

7.6 练习-进度条.

7.7 练习-显示文件夹复制进度条.

--------------------

这是how2Java网站的【图形界面】--组件综合练习 答案

主要参考评论区，可能存在bug。

链接：[（七）组件综合练习][Link 1]

# 七、组件综合练习 #

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu_size_16_color_FFFFFF_t_70][]

## 7.1 练习-为空判断. ##

在JTextField中输入数据，在旁边加一个按钮JButton,当点击按钮的时候，判断JTextFiled中有没有数据，并使用JOptionPane进行提示。

1、JButton事件响应：actionPerformed(ActionEvent e)

2、JTextFiled组件内容获取

3、JOptionPane弹窗组件使用。

JOptionPane.*showMessageDialog*(jf,"内容");

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu_size_16_color_FFFFFF_t_70 1][]

代码：

package gui;
    
    import javax.swing.*;
    import java.awt.*;
    import java.sql.*;
    
    public class TestGUI {
        public static void main(String[] args){
            JFrame jf = new JFrame("LOL");
            jf.setSize(416,300);
            jf.setLocation(500,300);
            jf.setLayout(null);
    
            JPanel jp = new JPanel();
            jp.setBounds(8,8,400,300);
            jp.setLayout(new FlowLayout());
    
            JTextField content = new JTextField("");
            content.setPreferredSize(new Dimension(80,30));
    
            JButton jb = new JButton("检测");
            jb.setSize(50,30);
            jb.addActionListener(e->{
                String cont = content.getText();
                if(cont.isEmpty()){
                  
                     
                            JOptionPane.showMessageDialog(jf,"文本内容为空");}
                else{
                            JOptionPane.showMessageDialog(jf,"文本内容为:"+cont);
                        }
               
            });
           
            jp.add(content);
            jp.add(jb);
    
            jf.add(jp);
    
    
            jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            jf.setVisible(true);
        }
    
    }

## 7.2 练习-数字校验. ##

在JTextField中输入数据，在旁边加一个按钮JButton,当点击按钮的时候，判断JTextFiled中的数据是否是数字，并使用JOptionPane进行提示

判断是否为数字： [https://blog.csdn.net/qq\_42133100/article/details/92158507?][https_blog.csdn.net_qq_42133100_article_details_92158507]

public static boolean isNumeric(String str){
        Pattern pattern = Pattern.compile("[0-9]*");
        return pattern.matcher(str).matches();   
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu_size_16_color_FFFFFF_t_70 2][] ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu_size_16_color_FFFFFF_t_70 3][]

代码：

package gui;
    
    import javax.swing.*;
    import java.awt.*;
    import java.sql.*;
    import java.util.regex.Pattern;
    
    public class TestGUI {
         public static boolean isNumeric(String str){
             Pattern pattern = Pattern.compile("[0-9]*");
             return pattern.matcher(str).matches();  
         }
        public static void main(String[] args){
            JFrame jf = new JFrame("LOL");
            jf.setSize(416,300);
            jf.setLocation(500,300);
            jf.setLayout(null);
    
            JPanel jp = new JPanel();
            jp.setBounds(8,8,400,300);
            jp.setLayout(new FlowLayout());
    
            JTextField content = new JTextField("");
            content.setPreferredSize(new Dimension(80,30));
    
            JButton jb = new JButton("检测");
            jb.setSize(50,30);
            jb.addActionListener(e->{
                String cont = content.getText();
                if(cont.isEmpty()) {
                            JOptionPane.showMessageDialog(jf,"输入框内容为空");}
                else{
                     if(isNumeric(cont))
                            JOptionPane.showMessageDialog(jf,"输入框内容是数字:"+cont);
                     else
                           JOptionPane.showMessageDialog(jf,"输入框内容不是数字");
                        }
               
            });
           
            jp.add(content);
            jp.add(jb);
    
            jf.add(jp);
    
    
            jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            jf.setVisible(true);
        }
    
    }

## 7.3 练习-账号密码验证. ##

准备两个JTextFiled,一个用于输入账号，一个用于输入密码。

使用密码框：

JPasswordField pf = new JPasswordField("");

再准备一个JButton，上面的文字是登陆

点击按钮之后，首先进行为空判断，如果都不为空，则把账号和密码，拿到数据库中进行比较([SQL语句判断账号密码是否正确][SQL])，根据判断结果，使用JOptionPane进行提示。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu_size_16_color_FFFFFF_t_70 4][]

代码：

package gui;
    
    import javax.swing.*;
    import java.awt.*;
    import java.sql.*;
    
    public class TestGUI {
        private static String url = "jdbc:mysql://127.0.0.1:3306/how2java?characterEncoding=UTF-8";
        private static String Name = "root";
        private static String Pwd = "root";
    
        public static void main(String[] args){
    
            try {
                Class.forName("com.mysql.jdbc.Driver");
            }catch (Exception e){
                e.printStackTrace();
            }
    
            JFrame jf = new JFrame("register");
            jf.setSize(416,300);
            jf.setLocation(500,300);
            jf.setLayout(null);
    
            JPanel jp1 = new JPanel();
            jp1.setBounds(8,8,400,30);
            jp1.setLayout(new FlowLayout());
    
            JLabel name = new JLabel("账号：");
            JTextField EnterName = new JTextField("");
            EnterName.setPreferredSize(new Dimension(80,30));
            JLabel password = new JLabel("密码：");
            JPasswordField EnterPwd = new JPasswordField("");
            EnterPwd.setPreferredSize(new Dimension(80,30));
            jp1.add(name);
            jp1.add(EnterName);
            jp1.add(password);
            jp1.add(EnterPwd);
    
            JPanel jp2 = new JPanel();
            jp2.setBounds(8,46,400,30);
            jp2.setLayout(new FlowLayout());
    
            JButton jb = new JButton("登录");
            jb.setSize(50,30);
            jb.addActionListener(e->{
                if(!EnterName.getText().isEmpty() && !EnterPwd.getText().isEmpty()){
                    try(Connection conn = DriverManager.getConnection(url,Name,Pwd)){
                        String str = "select * from user where name = ? and password = ?";
                        PreparedStatement ps = conn.prepareStatement(str);
                        ps.setString(1,EnterName.getText());
                        ps.setString(2,EnterPwd.getText());
                        ResultSet rs = ps.executeQuery();
                        if(rs.next()){
                            JOptionPane.showMessageDialog(jf,"登录成功");
                        }
                        else{
                            JOptionPane.showMessageDialog(jf,"账户名或者密码错误");
                        }
                    }catch (Exception ee){
                        ee.printStackTrace();
                    }
                }
            });
            jp2.add(jb);
    
    
            jf.add(jp1);
            jf.add(jp2);
    
    
            jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            jf.setVisible(true);
        }
    
    }

## 7.4 练习-黄鹤. ##

把[练习-黄鹤][-]改成Swing来完成

用到组件Jlabel、JTextField、JButton

要有为空和数字判断。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu_size_16_color_FFFFFF_t_70 5][]

代码：

package gui;
    
    import java.awt.Dimension;
    import java.awt.FlowLayout;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.util.regex.Pattern;
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JOptionPane;
    import javax.swing.JPanel;
    import javax.swing.JTextArea;
    import javax.swing.JTextField;
    
    public class TestGUI {
         public static boolean isNumeric(String str){
        Pattern pattern = Pattern.compile("[0-9]*");
        return pattern.matcher(str).matches();  
    }
        public static void main(String[] args) {
            JFrame f=new JFrame("LOL");
            f.setSize(400,500);
            f.setLocation(500,500);
            f.setLayout(null);
            
            JPanel p1=new JPanel();
            p1.setBounds(0, 0, 90, 170);
            p1.setLayout(new FlowLayout(FlowLayout.LEFT,10,18));
            JPanel p2=new JPanel();
            p2.setBounds(80, 0, 110, 170);
            p2.setLayout(new FlowLayout(FlowLayout.LEFT,20,15));
            JPanel p3=new JPanel();
            p3.setBounds(190, 0, 80, 170);
            p3.setLayout(new FlowLayout(FlowLayout.LEFT,10,18));
            JPanel p4=new JPanel();
            p4.setBounds(260, 0, 110, 170);
            p4.setLayout(new FlowLayout(FlowLayout.LEFT,20,15));
           
            JLabel l1=new JLabel("地名：");
            JLabel l2=new JLabel("公司类型：");
            JLabel l3=new JLabel("公司名称：");
            JLabel l4=new JLabel("老板名称：");
            JLabel l5=new JLabel("金额：");
            JLabel l6=new JLabel("产品：");
            JLabel l7=new JLabel("价格计量单位：");
           
            JTextField tf1=new JTextField();
            tf1.setPreferredSize(new Dimension(90,22));
            JTextField tf2=new JTextField();
            tf2.setPreferredSize(new Dimension(90,22));
            JTextField tf3=new JTextField();
            tf3.setPreferredSize(new Dimension(90,22));
            JTextField tf4=new JTextField();
            tf4.setPreferredSize(new Dimension(90,22));
            JTextField tf5=new JTextField();
            tf5.setPreferredSize(new Dimension(90,22));
            JTextField tf6=new JTextField();
            tf6.setPreferredSize(new Dimension(90,22));
            JTextField tf7=new JTextField();
            tf7.setPreferredSize(new Dimension(90,22));
           
            p1.add(l1);p1.add(l3);p1.add(l5);p1.add(l7);
            p2.add(tf1);p2.add(tf3);p2.add(tf5);p2.add(tf7);
            p3.add(l2);p3.add(l4);p3.add(l6);
            p4.add(tf2);p4.add(tf4);p4.add(tf6);
            f.add(p1);f.add(p2);f.add(p3);f.add(p4);
            
            JButton b=new JButton("生成");
            b.setBounds(160,170,80,30);
            
            JTextArea ta=new JTextArea();
            ta.setBounds(10, 220, 365, 230);
            ta.setLineWrap(true);
            
            b.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                     if (!tf1.getText().isEmpty()&&!tf2.getText().isEmpty()&&!tf3.getText().isEmpty()&&!tf4.getText().isEmpty()&&!tf5.getText().isEmpty()&&!tf6.getText().isEmpty()&&!tf7.getText().isEmpty())
                    {if (isNumeric(tf5.getText()))
                           {String str=tf1.getText()+"最大"+tf2.getText()+tf3.getText()+"倒闭了，"
                            + "王八蛋老板"+tf4.getText()+"吃喝嫖赌，欠下了"+tf5.getText()+"，"
                            + "带着他的小姨子跑了!我们没有办法，拿着"+tf6.getText()+"抵工资!"
                            + "原价都是一"+tf7.getText()+"多、两"+tf7.getText()+"多、三"+tf7.getText()+"多的"+tf6.getText()+"，"
                            + "现在全部只卖二十块，统统只要二十块!"+tf4.getText()+"王八蛋，"
                            + "你不是人!我们辛辛苦苦给你干了大半年，你不发工资，你还我血汗钱，还我血汗钱!";
                           ta.setText(str);}
                    else
                      JOptionPane.showMessageDialog(f, "金额不是数字!");
                    }
                     else
                           JOptionPane.showMessageDialog(f, "有内容为空!");
                }
                
            });
            
            f.add(b);
            f.add(ta);
            
            
            
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            f.setVisible(true);
        }
    
    }

## 7.5 练习-复利计算器. ##

参考[练习-百万富翁][- 1]，把 [网页版的复利计算器][Link 2] 改成swing来做。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu_size_16_color_FFFFFF_t_70 6][]

代码：

package gui;
    
    import java.awt.Dimension;
    import java.awt.FlowLayout;
    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.JPanel;
    import javax.swing.JTextField;
    
    public class TestGUI {
        
        public static void main(String[] args) {
            JFrame f=new JFrame("LOL");
            f.setSize(420,400);
            f.setLayout(null);
            f.setLocation(450,500);
            
            JPanel p1=new  JPanel();
            p1.setBounds(0,0,100,120);
            p1.setLayout(new FlowLayout(FlowLayout.LEFT,10,11));
            JPanel p2=new  JPanel();
            p2.setBounds(135,0,130,120);
            p2.setLayout(new FlowLayout(FlowLayout.LEFT,10,9));
            JPanel p3=new  JPanel();
            p3.setBounds(270,0,25,120);
            p3.setLayout(new FlowLayout(FlowLayout.LEFT,10,11));
            
            JPanel p4=new JPanel();
            p4.setBounds(0,140,400,35);
            p4.setLayout(new FlowLayout());
            
            JPanel p5=new  JPanel();
            p5.setBounds(0,195,70,120);
            p5.setLayout(new FlowLayout(FlowLayout.LEFT,10,11));
            JPanel p6=new  JPanel();
            p6.setBounds(135,195,130,120);
            p6.setLayout(new FlowLayout(FlowLayout.LEFT,10,9));
            JPanel p7=new  JPanel();
            p7.setBounds(270,195,25,120);
            p7.setLayout(new FlowLayout(FlowLayout.LEFT,10,11));
            
            JLabel l1=new JLabel("起始资金");
            JLabel l2=new JLabel("每年收益");
            JLabel l3=new JLabel("复利年数");
            JLabel l4=new JLabel("每年追加资金");
            JLabel l5=new JLabel("￥");
            JLabel l6=new JLabel("%");
            JLabel l7=new JLabel("年");
            JLabel l8=new JLabel("￥");
            
            JLabel l9=new JLabel("本金和");
            JLabel l10=new JLabel("利息和");
            JLabel l11=new JLabel("本息和");
            JLabel l12=new JLabel("￥");
            JLabel l13=new JLabel("￥");
            JLabel l14=new JLabel("￥");
            
            JTextField tf1=new JTextField();
            tf1.setPreferredSize(new Dimension(120,20));
            JTextField tf2=new JTextField();
            tf2.setPreferredSize(new Dimension(120,20));
            JTextField tf3=new JTextField();
            tf3.setPreferredSize(new Dimension(120,20));
            JTextField tf4=new JTextField();
            tf4.setPreferredSize(new Dimension(120,20));
            
            JTextField tf5=new JTextField();
            tf5.setPreferredSize(new Dimension(120,20));
            JTextField tf6=new JTextField();
            tf6.setPreferredSize(new Dimension(120,20));
            JTextField tf7=new JTextField();
            tf7.setPreferredSize(new Dimension(120,20));
            
            JButton b=new JButton("计算");
            b.setPreferredSize(new Dimension(80,30));
            b.addActionListener(new ActionListener() {
                
                public void actionPerformed(ActionEvent e) {
                    int initMoney,year,each;
                    float rate;
                    initMoney=Integer.valueOf(tf1.getText());//获取起始资金
                    rate=(Integer.valueOf(tf2.getText()));//获取每年收益
                    year=Integer.valueOf(tf3.getText());//获取复利年数
                    each=Integer.valueOf(tf4.getText());//每年追加资金
                    
                    int F1=(year-1)*each+initMoney;//本金和
                    int F3=(int) (each* fuli(  (1+rate/100),(year-1)) + initMoney*p( (1+rate/100) ,year));//本息和
                    int F2=F3-F1;//利息和
                    
                    tf5.setText(clauses(F1));
                    tf6.setText(clauses(F2));
                    tf7.setText(clauses(F3));
                    
                }
            });
            
            p1.add(l1);p1.add(l2);p1.add(l3);p1.add(l4);
            p2.add(tf1);p2.add(tf2);p2.add(tf3);p2.add(tf4);
            p3.add(l5);p3.add(l6);p3.add(l7);p3.add(l8);
            p4.add(b);
            
            p5.add(l9);p5.add(l10);p5.add(l11);
            p6.add(tf5);p6.add(tf6);p6.add(tf7);
            p7.add(l12);p7.add(l13);p7.add(l14);
            
            f.add(p1);f.add(p2);f.add(p3);
            f.add(p4);
            f.add(p5);f.add(p6);f.add(p7);
            
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            f.setVisible(true);
        }
    
        public static float p(float base,int power) {
            if(1==power)
                return base;
            if(0==power)
                return 1;
            float result = base;
            for(int i=0;i<power-1;i++) {
                result = result*base;
            }
            return result;
        }
        
        public static float fuli(float rate,int year) {
            float result = 0;
            for(int i=year;i>0;i--) {
                result +=p(rate,i);
            }
            return result;
        }
    
        protected static String clauses(int f1) {
            return String.format("%,d", f1);
        }
    }

## 7.6 练习-进度条. ##

设计一个线程，每隔100毫秒，就把进度条的进度+1。

从0%一直加到100%

刚开始加的比较快，以每隔100毫秒的速度增加，随着进度的增加，越加越慢，让处女座的使用者，干着急

变得多慢，根据你们和处女座同学，朋友的相处体验，自己把控。

> 1、进度条组件 
> 
> JProgressBar pb=**new** JProgressBar();
> 
> pb.setValue(i);

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu_size_16_color_FFFFFF_t_70 7][]

代码：

package gui;
    
    import java.awt.FlowLayout;
    
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JOptionPane;
    import javax.swing.JProgressBar;
    
    public class TestGUI {
    
        public static void main(String[] args) {
            JFrame f=new JFrame("LOL");
            f.setSize(400,300);
            f.setLocation(500,500);
            f.setLayout(new FlowLayout(FlowLayout.CENTER,100,20));
            
            JProgressBar pb=new JProgressBar();
            pb.setMaximum(100);
            Thread t=new Thread() {
                public void run() {
                    try {
                       
                      for (int i = 0; i <=100; i++) {
                            if(i<40) {
                                 
                                pb.setValue(i);
                                Thread.sleep(10);
                            }
                            if(i<60&&i>40) {
                                pb.setValue(i);
                                Thread.sleep(100);
                            }
                            if(i<80&&i>60) {
                                pb.setValue(i);
                                Thread.sleep(200);
                            }
                            if(i<100&&i>80) {
                                pb.setValue(i);
                                Thread.sleep(400);
                            }
                            if(i==100) {
                                 pb.setValue(0);
                                 i = 0;
                                JOptionPane.showMessageDialog(f, "下载失败！点击重试！");
                            }
                        }
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            };
            JButton b=new JButton("开始下载");
            b.addActionListener(e-> t.start());
            pb.setStringPainted(true);
           
            f.add(pb);
            f.add(b);
            
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            f.setVisible(true);
        }
    
    }

## 7.7 练习-显示文件夹复制进度条. ##

改进[练习-复制文件夹][- 2]提供进度条，把文件复制的进度显示出来。

![20200521233226784.png][]

package gui;
    
    import java.awt.Dimension;
    import java.awt.FlowLayout;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.io.BufferedReader;
    import java.io.File;
    import java.io.FileReader;
    import java.io.FileWriter;
    import java.io.IOException;
    import java.io.PrintWriter;
    
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JOptionPane;
    import javax.swing.JPanel;
    import javax.swing.JProgressBar;
    import javax.swing.JTextField;
    
    public class TestGUI {
        
        static long allFileSize = 0; // 所有需要复制的文件大小
        static long currentFileSizeCopied = 0;// 已复制的文件总大小
    
        public static void main(String[] args) {
            JFrame f=new  JFrame("复制文件");
            f.setSize(400,200);
            f.setLocation(500,500);
            f.setLayout(null);
            
            JPanel p1=new JPanel();
            p1.setBounds(0,0,400,40);
            p1.setLayout(new FlowLayout(FlowLayout.CENTER,10,10));
            JLabel l1=new JLabel("源文件地址：");
            JLabel l2=new JLabel("复制到：");
            JTextField tf1=new JTextField();
            tf1.setPreferredSize(new Dimension(80,30));
            tf1.setText("C:\\迅雷下载");
            JTextField tf2=new JTextField();
            tf2.setText("C:\\Users\\LH\\Desktop\\迅雷下载");
            tf2.setPreferredSize(new Dimension(80,30));
            p1.add(l1);
            p1.add(tf1);
            p1.add(l2);
            p1.add(tf2);
            
            JButton b=new JButton("开始复制");
            
            JProgressBar pg=new JProgressBar();
            pg.setMaximum(100);
            pg.setValue(0);
            pg.setStringPainted(true);
            
            JPanel p2=new JPanel();
            p2.setBounds(0,40,400,50);
            p2.setLayout(new FlowLayout(FlowLayout.CENTER,10,10));
            JLabel l3=new JLabel("文件复制进度：");
            p2.add(b);
            p2.add(l3);
            p2.add(pg);
            f.add(p1);
            f.add(p2);
            
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            f.setVisible(true);
            
            calclateAllFilesize(new File(tf1.getText()));
            
            b.addActionListener(new ActionListener() {
                
                public void actionPerformed(ActionEvent e) {
                    String A=tf1.getText();
                    String B=tf2.getText();
                    
                    new Thread(() -> copyFolder(A,B)).start();
                    b.setEnabled(false);
                }
                
                public void copyFolder(String srcFolder, String destFolder){
                    
                    File sf = new File(srcFolder);
                    File df = new File(destFolder);
                    
                    if (!sf.exists())
                        return;
    
                    if (!sf.isDirectory())
                        return;
    
                    if (df.isFile())
                        return;
    
                    if (!df.exists())
                        df.mkdirs();
                    
    //            创建文件引用集合
                    File[] f = sf.listFiles();
    //            创建文件名称集合
                    String[] name = sf.list();
    //            for读出
                    for(int i=0;i<f.length;i++) {
    //                如果不是目录则执行
                        if(!f[i].isDirectory()) {
    //                    将源文件写入目标文件之中
                            copyFile(f[i].getAbsolutePath(), new File(df+"/"+name[i]).getAbsolutePath());
                            
                            currentFileSizeCopied += f[i].length();
                            double current = (double) currentFileSizeCopied / (double) allFileSize;
                            int progress = (int) (current * 100);
                            pg.setValue(progress);
                            
                            if(progress==100) {
                                JOptionPane.showMessageDialog(p2, "复制完毕");
                                b.setEnabled(true);
                            }
                        }else {
    //                    反之则先创建父目录,再在将源文件写入目标文件之中
                            new File(df+"/"+name[i]).mkdirs();
                            copyFolder(f[i].getAbsolutePath(), new File(df+"/"+name[i]).getAbsolutePath());
                        }
                    }
                }
                
            //  文件写入
                public void copyFile(String srcFolder, String destFolder) {
                     
                    try(BufferedReader br = new BufferedReader(new FileReader(srcFolder));
                        PrintWriter pw = new PrintWriter(new FileWriter(destFolder))) {
                        while(true) {
                            String str = br.readLine();
                            if(str==null)
                                break;
                            pw.println(str);
                        }
                    } catch (IOException e) {
                        e.getStackTrace();
                    }
                     
                }
            });
            
            
            
        }
        
        public static void calclateAllFilesize(File file) {
    
            if (file.isFile()) {
                allFileSize += file.length();
            }
            if (file.isDirectory()) {
                File[] fs = file.listFiles();
                for (File f : fs) {
                    calclateAllFilesize(f);
                }
            }
    
        }
    
    }

[Link 1]: https://how2j.cn/k/gui/gui-component-practise/707.html
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200521233226782.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20200521233226741.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu,size_16,color_FFFFFF,t_70
[https_blog.csdn.net_qq_42133100_article_details_92158507]: https://blog.csdn.net/qq_42133100/article/details/92158507?utm_medium=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.nonecase&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.nonecase
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20200521233226735.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20200521233226630.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu,size_16,color_FFFFFF,t_70
[SQL]: https://how2j.cn/k/jdbc/jdbc-resultset/390.html#step870
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20200521233226772.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu,size_16,color_FFFFFF,t_70
[-]: https://how2j.cn/k/number-string/number-string-foramt/320.html#step2199
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu_size_16_color_FFFFFF_t_70 5]: https://img-blog.csdnimg.cn/20200521233226791.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu,size_16,color_FFFFFF,t_70
[- 1]: https://how2j.cn/k/control-flow/control-flow-break/276.html#step2172
[Link 2]: https://how2j.cn/k/javascript/javascript-practise/654.html#step2101
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu_size_16_color_FFFFFF_t_70 6]: https://img-blog.csdnimg.cn/20200521233226792.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu_size_16_color_FFFFFF_t_70 7]: https://img-blog.csdnimg.cn/20200521233226734.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NfY2h1eGlu,size_16,color_FFFFFF,t_70
[- 2]: https://how2j.cn/k/io/io-filecopy-foldercopy/344.html#step776
[20200521233226784.png]: https://img-blog.csdnimg.cn/20200521233226784.png