java小程序之简单学生信息录入界面.zip

import java.io.*; import java.awt.*; import java.awt.event.*; import javax.swing.*; class Win extends JFrame implements ActionListener { FileReader r_file; FileWriter w_file; BufferedReader buf_reader; BufferedWriter buf_writer; JTextArea txt; JButton btn1,btn2; Win() { setSize(400,400); setVisible(true); txt = new JTextArea(10,10); btn1 = new JButton("Read"); btn2 = new JButton("Write"); btn1.addActionListener(this); btn2.addActionListener(this); JPanel p = new JPanel(); add(txt,"Center"); add(p,"South"); p.setLayout(new FlowLayout()); p.add(btn1); p.add(btn2); validate(); setDefaultCloseOperation(EXIT_ON_CLOSE); } public void actionPerformed(ActionEvent e) { if(e.getSource()==btn1) { readFile(); } if(e.getSource()==btn2) { writeFile(); } } //读取文件 public void readFile() { String s; try { File f=new File("C:\\Users\\Administrator\\Desktop\\java小程序\\a.txt"); r_file = new FileReader(f); buf_reader = new BufferedReader(r_file); } catch(IOException ef) { System.out.print(ef); } try { while ((s = buf_reader.readLine())!=null) { txt.append(s+'\n');} } catch(IOException er) { System.out.print(er); } } public void writeFile() { try { w_file = new FileWriter("C:\\Users\\Administrator\\Desktop\\java小程序\\b.txt"); buf_writer = new BufferedWriter(w_file); String str = txt.getText(); buf_writer.write(str,0,str.length()); buf_writer.flush(); } catch(IOException ew) { System.out.print(ew); } } } public class e81 { public static void main(String args[]) { Win w=new Win(); } }