java之 22天 GUI 图形界面编程(二)

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

模拟window开打文件 

Java代码

import java.awt.Button;  
import java.awt.Dialog;  
import java.awt.FlowLayout;  
import java.awt.Frame;  
import java.awt.Label;  
import java.awt.TextArea;  
import java.awt.TextField;  
import java.awt.event.ActionEvent;  
import java.awt.event.ActionListener;  
import java.awt.event.KeyAdapter;  
import java.awt.event.KeyEvent;  
import java.awt.event.WindowAdapter;  
import java.awt.event.WindowEvent;  
import java.io.File;  
  
public class MyWinDemo {  
  
    private Frame f;  
    private TextField tf;  
    private Button btn;  
    private TextArea ta;  
    private Dialog d;  
    private Label lab;  
    private Button okbtn;  
      
    MyWinDemo(){  
        init();  
    }  
      
    private void init(){  
        f=new Frame("my Window");  
        f.setBounds(300,100,600,500);  
        f.setLayout(new FlowLayout());  
          
        tf=new TextField(60);  
          
        btn=new Button("转到");  
        ta=new TextArea(25,70);  
          
        d=new Dialog(f,"提示信息-self",true);  
        d.setBounds(400,200,250,150);  
        d.setLayout(new FlowLayout());  
          
        lab=new Label();  
        okbtn=new Button("确定");  
          
        d.add(lab);  
        d.add(okbtn);  
          
          
        f.add(tf);  
        f.add(btn);  
        f.add(ta);  
          
        myEvent();  
        f.setVisible(true);  
          
    }  
      
      
    private void myEvent() {  
          
        //添加 回车 时候 自动转到  
        tf.addKeyListener(new KeyAdapter() {  
            @Override  
            public void keyPressed(KeyEvent e) {  
                // TODO Auto-generated method stub  
                if(e.getKeyCode()==KeyEvent.VK_ENTER){  
                    showDir();  
                }  
            }  
        });  
        //确定按钮事件  
        okbtn.addActionListener(new ActionListener() {  
              
            @Override  
            public void actionPerformed(ActionEvent e) {  
                // TODO Auto-generated method stub  
                d.setVisible(false);  
            }  
        });  
          
        d.addWindowListener(new WindowAdapter() {  
            @Override  
            public void windowClosing(WindowEvent e) {  
                // TODO Auto-generated method stub  
                d.setVisible(false);  
            }  
          
        });  
          
        btn.addActionListener(new ActionListener() {  
              
            @Override  
            public void actionPerformed(ActionEvent e) {  
                showDir();  
            }  
              
        });  
          
          
        f.addWindowListener(new WindowAdapter() {  
            public void windowClosing(WindowEvent e){  
                System.exit(0);  
            }  
              
        });  
          
    }  
    private void showDir() {  
        String dirPath=tf.getText();  
          
        File dir=new File(dirPath);  
        if(dir.exists() && dir.isDirectory()){  
            ta.setText("");  
            String[] names=dir.list();  
            for (String name : names) {  
                ta.append(name+"
");  
                //ta.setText(text);  
            }  
        }else{  
            String info="您输入的信息:"+dirPath+"有误,请重新输入";  
            lab.setText(info);  
            d.setVisible(true);  
        }  
          
        tf.setText("");  
    }  
    public static void main(String[] args) {  
        new MyWinDemo();  
    }  
  
}  

模拟简单记事本 

Java代码

import java.awt.FileDialog;  
import java.awt.Frame;  
import java.awt.Menu;  
import java.awt.MenuBar;  
import java.awt.MenuItem;  
import java.awt.TextArea;  
import java.awt.event.ActionEvent;  
import java.awt.event.ActionListener;  
import java.awt.event.WindowAdapter;  
import java.awt.event.WindowEvent;  
import java.io.BufferedReader;  
import java.io.BufferedWriter;  
import java.io.File;  
import java.io.FileReader;  
import java.io.FileWriter;  
import java.io.IOException;  
  
/** 
 * 实现菜单栏 
 */  
public class MyMenuDemo {  
  
      
    private Frame f;  
    private MenuBar mb;  
    private Menu m,subm;  
    private MenuItem closeItem,openItem,saveItem,subItem1,subItem;  
    private FileDialog openDialog,saveDialog;  
    private TextArea ta;  
    private File file;  
      
    MyMenuDemo(){  
        init();  
    }  
      
    private void init(){  
        f=new Frame("my Window");  
        f.setBounds(300,100,600,500);  
        //f.setLayout();  
          
        mb=new MenuBar();  
        m=new Menu("文件");  
          
        closeItem=new MenuItem("退出");  
        openItem=new MenuItem("打开");  
        saveItem=new MenuItem("保存");  
          
        subm=new Menu("新建");  
        subItem1=new MenuItem("Web Project");  
        subItem=new MenuItem("Java Project");  
        subm.add(subItem);  
        subm.add(subItem1);  
          
        m.add(subm);  
        m.add(openItem);  
        m.add(saveItem);  
        m.add(closeItem);  
        mb.add(m);  
          
        openDialog=new FileDialog(f,"我要打开",FileDialog.LOAD);  
        saveDialog=new FileDialog(f,"我要保存",FileDialog.SAVE);  
          
        ta=new TextArea();  
          
        f.add(ta);  
        f.setMenuBar(mb);  
        myEvent();  
          
        f.setVisible(true);  
          
    }  
      
    private void myEvent() {  
          
        saveItem.addActionListener(new ActionListener() {  
              
            @Override  
            public void actionPerformed(ActionEvent e) {  
                // TODO Auto-generated method stub  
                if(file==null){  
                    saveDialog.setVisible(true);  
                    String dirPath=saveDialog.getDirectory();  
                    String fileName=saveDialog.getFile();  
                    if(dirPath==null || fileName==null)  
                        return;  
                    file=new File(dirPath,fileName);  
                }  
                try {  
                      
                    BufferedWriter bufw=new BufferedWriter(new FileWriter(file));  
                      
                    String text=ta.getText();  
                      
                    bufw.write(text);  
                    bufw.close();  
                } catch (IOException e2) {  
                    throw new RuntimeException("保存失败");  
                }  
                  
            }  
        });  
          
        //打开菜单  
        openItem.addActionListener(new ActionListener() {  
              
            @Override  
            public void actionPerformed(ActionEvent e) {  
                // TODO Auto-generated method stub  
                openDialog.setVisible(true);  
                String dirPath=openDialog.getDirectory();  
                String fileName=openDialog.getFile();  
                System.out.println(dirPath+"...."+fileName);  
                if(dirPath==null || fileName==null)  
                    return;  
                ta.setText("");  
                file=new File(dirPath,fileName);  
                try {  
                    BufferedReader bufr=new BufferedReader(new FileReader(file));  
                    String line=null;  
                    while((line=bufr.readLine())!=null){  
                        ta.append(line+"
");  
                    }  
                    bufr.close();  
                } catch (IOException e2) {  
                    throw new RuntimeException("打开异常");  
                }  
                  
            }  
        });  
          
          
        closeItem.addActionListener(new ActionListener() {  
              
            @Override  
            public void actionPerformed(ActionEvent e) {  
                // TODO Auto-generated method stub  
                System.exit(0);  
            }  
        });  
          
        f.addWindowListener(new WindowAdapter() {  
            public void windowClosing(WindowEvent e){  
                System.exit(0);  
            }  
              
        });  
          
    }  
      
      
    public static void main(String[] args) {  
        // TODO Auto-generated method stub  
        new MyMenuDemo();  
    }  
  
}