java精编教程源代码.rar

import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.io.*; public class WindowReader extends JFrame implements ActionListener { JFileChooser fileDialog ; JMenuBar menubar; JMenu menu; JMenuItem itemSave,itemOpen; JTextArea text; BufferedReader in; FileReader fileReader; BufferedWriter out; FileWriter fileWriter; WindowReader() { init(); setSize(300,400); setVisible(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } void init() { text=new JTextArea(10,10); text.setFont(new Font("楷体_gb2312",Font.PLAIN,28)); add(new JScrollPane(text),BorderLayout.CENTER); menubar=new JMenuBar(); menu=new JMenu("文件"); itemSave=new JMenuItem("保存文件"); itemOpen=new JMenuItem("打开文件"); itemSave.addActionListener(this); itemOpen.addActionListener(this); menu.add(itemSave); menu.add(itemOpen); menubar.add(menu); setJMenuBar(menubar); fileDialog=new JFileChooser(); } public void actionPerformed(ActionEvent e) { if(e.getSource()==itemSave) { int state=fileDialog.showSaveDialog(this); if(state==JFileChooser.APPROVE_OPTION) { try{ File dir=fileDialog.getCurrentDirectory(); String name=fileDialog.getSelectedFile().getName(); File file=new File(dir,name); fileWriter=new FileWriter(file); out=new BufferedWriter(fileWriter); out.write(text.getText()); out.close(); fileWriter.close(); } catch(IOException exp){} } } else if(e.getSource()==itemOpen) { int state=fileDialog.showOpenDialog(this); if(state==JFileChooser.APPROVE_OPTION) { text.setText(null); try{ File dir=fileDialog.getCurrentDirectory(); String name=fileDialog.getSelectedFile().getName(); File file=new File(dir,name); fileReader=new FileReader(file); in=new BufferedReader(fileReader); String s=null; while((s=in.readLine())!=null) { text.append(s+"\n"); } in.close(); fileReader.close(); } catch(IOException exp){} } } } }