example20_12.java

不错的教程 适合中高级人员的使用

import java.io.*;
import javax.swing.*;
import java.awt.*;import 
java.awt.event.*;
import javax.swing.border.*;
class InputArea extends Panel 
implements ActionListener
{  File f=null;
   RandomAccessFile out;
   Box baseBox ,boxV1,boxV2; 
   TextField name,email,phone;
   Button button;
   InputArea(File f)
   {   setBackground(Color.cyan);
       this.f=f;
       name=new TextField(12);
       email=new TextField(12); 
       phone=new TextField(12);
       button=new Button("录入");
       button.addActionListener(this);
       boxV1=Box.createVerticalBox();
       boxV1.add(new Label("输入姓名"));
       boxV1.add(Box.createVerticalStrut(8));
       boxV1.add(new Label("输入email"));
       boxV1.add(Box.createVerticalStrut(8));
       boxV1.add(new Label("输入电话"));
       boxV1.add(Box.createVerticalStrut(8));
       boxV1.add(new Label("单击录入"));
       boxV2=Box.createVerticalBox();
       boxV2.add(name);
       boxV2.add(Box.createVerticalStrut(8));
       boxV2.add(email);
       boxV2.add(Box.createVerticalStrut(8));
       boxV2.add(phone);
       boxV2.add(Box.createVerticalStrut(8));
       boxV2.add(button);
       baseBox=Box.createHorizontalBox();
       baseBox.add(boxV1);
       baseBox.add(Box.createHorizontalStrut(10));
       baseBox.add(boxV2);
       add(baseBox); 
   }
   public void actionPerformed(ActionEvent e)
   {  try{
           RandomAccessFile out=new RandomAccessFile(f,"rw");
           if(f.exists())
              {  long length=f.length();
                 out.seek(length);
              }
           out.writeUTF("姓名:"+name.getText());
           out.writeUTF("eamil:"+email.getText());
           out.writeUTF("电话:"+phone.getText());
           out.close();
         }
       catch(IOException ee){}
   }
}

public class Example20_12 extends Frame implements ActionListener
{  File file=null;
   MenuBar bar;
   Menu fileMenu;
   MenuItem 录入,显示;
   TextArea show;
   InputArea inputMessage;
   CardLayout card=null; //卡片式布局.
   Panel pCenter;
   Example20_12()
   { 
       file=new File("通讯录.txt");
       录入=new MenuItem("录入");
       显示=new MenuItem("显示");
       bar=new MenuBar();
       fileMenu=new Menu("菜单选项");
       fileMenu.add(录入);
       fileMenu.add(显示);
       bar.add(fileMenu);
       setMenuBar(bar);
       录入.addActionListener(this);
       显示.addActionListener(this);
       inputMessage=new InputArea(file);
       show=new TextArea(12,20); 
       card=new CardLayout();
       pCenter=new Panel();
       pCenter.setLayout(card);
       pCenter.add("录入",inputMessage);
       pCenter.add("显示",show);

       add(pCenter,BorderLayout.CENTER);
       addWindowListener(new WindowAdapter()
                    { public void windowClosing(WindowEvent e)
                       {
                          System.exit(0);
      	               }
                    });
      setVisible(true);
      setBounds(100,50,420,380);
      validate();
   }
   public void actionPerformed(ActionEvent e)
   {
     if(e.getSource()==录入)
       {
         card.show(pCenter,"录入");
       }
     else if(e.getSource()==显示)
       { int number=1;
         card.show(pCenter,"显示");
         try{  RandomAccessFile in=new RandomAccessFile(file,"r");
               String 姓名=null; 
               while((姓名=in.readUTF())!=null)   
                  {  show.append("\n"+number+" "+姓名);
                     show.append(in.readUTF());  //读取email.
                     show.append(in.readUTF());  //读取phone
                     show.append("\n------------------------- ");
                     number++;
                  }
               in.close();
             }
         catch(Exception ee){}
       }
   }
   public static void main(String args[])
   {  new Example20_12();
   }
}