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标题: java读写文件 [打印本页]

作者: weigongwan 时间: 2008-08-25 10:44
标题: java读写文件

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
public class SimpleEditor
{
   static MouseListener m1=new MouseListener() {
      public void mouseClicked(MouseEvent e) {

      }

      public void mouseEntered(MouseEvent e) {

      }
      public void mouseExited(MouseEvent e) {

      }
      public void mousePressed(MouseEvent e) {
         if(e.getSource()==jok) {
               s=jta.getText();
               writeFile();
         }
         else {
               System.out.println("Cancel");
               System.exit(1);
         }
      }
      public void mouseReleased(MouseEvent e) {

      }

   };
   static String s;
   static JTextArea jta=new JTextArea("abc",17,20);
   static JButton jok=new JButton("OK");
   static JButton jcnl=new JButton("Cancal");

   public static void main(String args[]) {
      readFile();
      int v=Scrollbar.VERTICAL;
      int h=Scrollbar.HORIZONTAL;

      JPanel jp1=new JPanel();
      JPanel jp2=new JPanel();
      JFrame jf=new JFrame("The simplest editor");
      JScrollPane jsp=new JScrollPane(jta);
      jta.setLineWrap(true);
      jta.setEditable(true);
      jta.setText(s);
      jok.addMouseListener(m1);
      jcnl.addMouseListener(m1);
      jp1.add(jsp);
      jp2.add(jok);
      jp2.add(jcnl);
      jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      jf.getContentPane().add(jp1,BorderLayout.NORTH);
      jf.getContentPane().add(jp2,BorderLayout.SOUTH);
      jf.setBounds(100,200,300,400);
      jf.setResizable(false);
      jf.setVisible(true);


}

public static void readFile() {
      try {
         File f=new File("save.txt");
         if(f.exists())
            System.out.println("exist!");
         if(f.canRead()) {
            FileReader fr=new FileReader(f);
            int len=(int)f.length();
            char []buff=new char[len];
            fr.read(buff,0,len);
            s=new String(buff);
            fr.close();
         }
         else {
            s=new String("");
         }
      }
      catch (Exception e) {
         e.printStackTrace();
      }

}
public static void writeFile() {
      try {
         File f=new File("save.txt");
         if(f.exists())
            System.out.println("exist!");

         FileWriter fw=new FileWriter(f);
         fw.write(s);
         fw.close();
         System.out.println(s);
      }
      catch (Exception e) {
         e.printStackTrace();
      }
}
}

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