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

 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+"\r\n");
                 //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

 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+"\r\n");
                     }
                     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();
     }  

 }