java之 22天 GUI 图形界面编程

Posted 2020-08-14

转自：http://takeme.iteye.com/blog/1876853

模拟window开打文件 

Java代码

  1 import java.awt.Button;  
  2 import java.awt.Dialog;  
  3 import java.awt.FlowLayout;  
  4 import java.awt.Frame;  
  5 import java.awt.Label;  
  6 import java.awt.TextArea;  
  7 import java.awt.TextField;  
  8 import java.awt.event.ActionEvent;  
  9 import java.awt.event.ActionListener;  
 10 import java.awt.event.KeyAdapter;  
 11 import java.awt.event.KeyEvent;  
 12 import java.awt.event.WindowAdapter;  
 13 import java.awt.event.WindowEvent;  
 14 import java.io.File;  
 15   
 16 public class MyWinDemo {  
 17   
 18     private Frame f;  
 19     private TextField tf;  
 20     private Button btn;  
 21     private TextArea ta;  
 22     private Dialog d;  
 23     private Label lab;  
 24     private Button okbtn;  
 25       
 26     MyWinDemo(){  
 27         init();  
 28     }  
 29       
 30     private void init(){  
 31         f=new Frame("my Window");  
 32         f.setBounds(300,100,600,500);  
 33         f.setLayout(new FlowLayout());  
 34           
 35         tf=new TextField(60);  
 36           
 37         btn=new Button("转到");  
 38         ta=new TextArea(25,70);  
 39           
 40         d=new Dialog(f,"提示信息-self",true);  
 41         d.setBounds(400,200,250,150);  
 42         d.setLayout(new FlowLayout());  
 43           
 44         lab=new Label();  
 45         okbtn=new Button("确定");  
 46           
 47         d.add(lab);  
 48         d.add(okbtn);  
 49           
 50           
 51         f.add(tf);  
 52         f.add(btn);  
 53         f.add(ta);  
 54           
 55         myEvent();  
 56         f.setVisible(true);  
 57           
 58     }  
 59       
 60       
 61     private void myEvent() {  
 62           
 63         //添加 回车 时候 自动转到  
 64         tf.addKeyListener(new KeyAdapter() {  
 65             @Override  
 66             public void keyPressed(KeyEvent e) {  
 67                 // TODO Auto-generated method stub  
 68                 if(e.getKeyCode()==KeyEvent.VK_ENTER){  
 69                     showDir();  
 70                 }  
 71             }  
 72         });  
 73         //确定按钮事件  
 74         okbtn.addActionListener(new ActionListener() {  
 75               
 76             @Override  
 77             public void actionPerformed(ActionEvent e) {  
 78                 // TODO Auto-generated method stub  
 79                 d.setVisible(false);  
 80             }  
 81         });  
 82           
 83         d.addWindowListener(new WindowAdapter() {  
 84             @Override  
 85             public void windowClosing(WindowEvent e) {  
 86                 // TODO Auto-generated method stub  
 87                 d.setVisible(false);  
 88             }  
 89           
 90         });  
 91           
 92         btn.addActionListener(new ActionListener() {  
 93               
 94             @Override  
 95             public void actionPerformed(ActionEvent e) {  
 96                 showDir();  
 97             }  
 98               
 99         });  
100           
101           
102         f.addWindowListener(new WindowAdapter() {  
103             public void windowClosing(WindowEvent e){  
104                 System.exit(0);  
105             }  
106               
107         });  
108           
109     }  
110     private void showDir() {  
111         String dirPath=tf.getText();  
112           
113         File dir=new File(dirPath);  
114         if(dir.exists() && dir.isDirectory()){  
115             ta.setText("");  
116             String[] names=dir.list();  
117             for (String name : names) {  
118                 ta.append(name+"\r\n");  
119                 //ta.setText(text);  
120             }  
121         }else{  
122             String info="您输入的信息:"+dirPath+"有误,请重新输入";  
123             lab.setText(info);  
124             d.setVisible(true);  
125         }  
126           
127         tf.setText("");  
128     }  
129     public static void main(String[] args) {  
130         new MyWinDemo();  
131     }  
132   
133 }  

模拟简单记事本 

Java代码

  1 import java.awt.FileDialog;  
  2 import java.awt.Frame;  
  3 import java.awt.Menu;  
  4 import java.awt.MenuBar;  
  5 import java.awt.MenuItem;  
  6 import java.awt.TextArea;  
  7 import java.awt.event.ActionEvent;  
  8 import java.awt.event.ActionListener;  
  9 import java.awt.event.WindowAdapter;  
 10 import java.awt.event.WindowEvent;  
 11 import java.io.BufferedReader;  
 12 import java.io.BufferedWriter;  
 13 import java.io.File;  
 14 import java.io.FileReader;  
 15 import java.io.FileWriter;  
 16 import java.io.IOException;  
 17   
 18 /** 
 19  * 实现菜单栏 
 20  */  
 21 public class MyMenuDemo {  
 22   
 23       
 24     private Frame f;  
 25     private MenuBar mb;  
 26     private Menu m,subm;  
 27     private MenuItem closeItem,openItem,saveItem,subItem1,subItem;  
 28     private FileDialog openDialog,saveDialog;  
 29     private TextArea ta;  
 30     private File file;  
 31       
 32     MyMenuDemo(){  
 33         init();  
 34     }  
 35       
 36     private void init(){  
 37         f=new Frame("my Window");  
 38         f.setBounds(300,100,600,500);  
 39         //f.setLayout();  
 40           
 41         mb=new MenuBar();  
 42         m=new Menu("文件");  
 43           
 44         closeItem=new MenuItem("退出");  
 45         openItem=new MenuItem("打开");  
 46         saveItem=new MenuItem("保存");  
 47           
 48         subm=new Menu("新建");  
 49         subItem1=new MenuItem("Web Project");  
 50         subItem=new MenuItem("Java Project");  
 51         subm.add(subItem);  
 52         subm.add(subItem1);  
 53           
 54         m.add(subm);  
 55         m.add(openItem);  
 56         m.add(saveItem);  
 57         m.add(closeItem);  
 58         mb.add(m);  
 59           
 60         openDialog=new FileDialog(f,"我要打开",FileDialog.LOAD);  
 61         saveDialog=new FileDialog(f,"我要保存",FileDialog.SAVE);  
 62           
 63         ta=new TextArea();  
 64           
 65         f.add(ta);  
 66         f.setMenuBar(mb);  
 67         myEvent();  
 68           
 69         f.setVisible(true);  
 70           
 71     }  
 72       
 73     private void myEvent() {  
 74           
 75         saveItem.addActionListener(new ActionListener() {  
 76               
 77             @Override  
 78             public void actionPerformed(ActionEvent e) {  
 79                 // TODO Auto-generated method stub  
 80                 if(file==null){  
 81                     saveDialog.setVisible(true);  
 82                     String dirPath=saveDialog.getDirectory();  
 83                     String fileName=saveDialog.getFile();  
 84                     if(dirPath==null || fileName==null)  
 85                         return;  
 86                     file=new File(dirPath,fileName);  
 87                 }  
 88                 try {  
 89                       
 90                     BufferedWriter bufw=new BufferedWriter(new FileWriter(file));  
 91                       
 92                     String text=ta.getText();  
 93                       
 94                     bufw.write(text);  
 95                     bufw.close();  
 96                 } catch (IOException e2) {  
 97                     throw new RuntimeException("保存失败");  
 98                 }  
 99                   
100             }  
101         });  
102           
103         //打开菜单  
104         openItem.addActionListener(new ActionListener() {  
105               
106             @Override  
107             public void actionPerformed(ActionEvent e) {  
108                 // TODO Auto-generated method stub  
109                 openDialog.setVisible(true);  
110                 String dirPath=openDialog.getDirectory();  
111                 String fileName=openDialog.getFile();  
112                 System.out.println(dirPath+"...."+fileName);  
113                 if(dirPath==null || fileName==null)  
114                     return;  
115                 ta.setText("");  
116                 file=new File(dirPath,fileName);  
117                 try {  
118                     BufferedReader bufr=new BufferedReader(new FileReader(file));  
119                     String line=null;  
120                     while((line=bufr.readLine())!=null){  
121                         ta.append(line+"\r\n");  
122                     }  
123                     bufr.close();  
124                 } catch (IOException e2) {  
125                     throw new RuntimeException("打开异常");  
126                 }  
127                   
128             }  
129         });  
130           
131           
132         closeItem.addActionListener(new ActionListener() {  
133               
134             @Override  
135             public void actionPerformed(ActionEvent e) {  
136                 // TODO Auto-generated method stub  
137                 System.exit(0);  
138             }  
139         });  
140           
141         f.addWindowListener(new WindowAdapter() {  
142             public void windowClosing(WindowEvent e){  
143                 System.exit(0);  
144             }  
145               
146         });  
147           
148     }  
149       
150       
151     public static void main(String[] args) {  
152         // TODO Auto-generated method stub  
153         new MyMenuDemo();  
154     }  
155   
156 }