java保存功能.doc

保存时文件名如file.txt 文件格式也要输入 ！注意该程序只能打开txt文件、java源程序文件、html文件等, Word的doc文件是特殊格式文件不能用本程序打开。 import java.io.*; import java.awt.*; import java.awt.event.*; public class jtxtfm public static void main(String args) jtxtfrm fm=new jtxtfrm(); class jtxtfrm extends Frame implements ActionListener FileDialog op,sv; Button btn1,btn2,btn3; TextArea tarea; jtxtfrm() super(读写文件); setLayout(null); setBackground(Color.cyan); setSize(600,300); setVisible(true); btn1=new Button(打开); btn2=new Button(保存); btn3=new Button(关闭); tarea=new TextArea(); add(btn1);add(btn2);add(btn3);add(tarea); tarea.setBounds(30,50,460,220); btn1.setBounds(520,60,50,30); btn2.setBounds(520,120,50,30); btn3.setBounds(520,180,50,30); op=new FileDialog(this,打开,FileDialog.LOAD); sv=new FileDialog(this,保存,FileDialog.SAVE); btn1.addActionListener(this); btn2.addActionListener(this); btn3.addActionListener(this); addWindowListener( new WindowAdapter() public void windowClosing(WindowEvent e) setVisible(false); System.exit(0); ); public void actionPerformed(ActionEvent e) if(e.getSource()=btn1) String str; op.setVisible(true); try File f1=new File(op.getDirectory(),op.getFile(); FileReader fr=new FileReader(f1); BufferedReader br=new BufferedReader(fr); tarea.setText(); while(str=br.readLine()!=null)tarea.append(str+n); fr.close(); catch(Exception e1) if(e.getSource()=btn2) sv.setVisible(true); try File f1=new File(sv.getDirectory(),sv.getFile(); FileWriter fw=new FileWriter(f1); BufferedWriter bw=new BufferedWriter(fw); String gt=tarea.getText(); bw.write(gt,0,gt.length(); bw.f