文件保存出错

Question

请看下面代码： /* * NoteBook development * iGeneral * 2012.10.12 * step: * 1.JFrame+JMenuBar+JMenu+JMenuItem * 2.ActionListon */ package lesson46; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import javax.swing.*; public class NoteBook extends JFrame implements ActionListener { //default widget JMenuBar jmb=null; JMenu jmn=null; JMenuItem jmiOpen=null; JMenuItem jmiSave=null; JTextArea jta=null; public static void main(String[] args) { NoteBook noteBook=new NoteBook(); } public NoteBook(){ //create widget jta=new JTextArea(); jmb=new JMenuBar(); jmn=new JMenu("File"); //set memory word jmn.setMnemonic('F'); jmn.setToolTipText("Operate File"); //ImageIcon imgOpen=new ImageIcon("btnOpen.png"); jmiOpen=new JMenuItem("Open", new ImageIcon("./btnOpen.png")); //jmiOpen.setText("111"); jmiOpen.setMnemonic('O'); jmiOpen.addActionListener(this); jmiOpen.setActionCommand("File_Open"); jmiSave=new JMenuItem("Save",new ImageIcon("images/btnSave.png")); jmiSave.setMnemonic('S'); jmiSave.addActionListener(this); jmiSave.setActionCommand("File_Save"); jmn.add(jmiOpen); jmn.add(jmiSave); jmb.add(jmn); this.setJMenuBar(jmb); this.add(jta); //set windows nature this.setTitle("iGeneral NoteBook"); this.setSize(500, 400); this.setLocation(400, 200); this.setVisible(true); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } //Override actionPerformed() public void actionPerformed(ActionEvent e) { if(e.getActionCommand().equals("File_Open")){ //System.out.println("Open"); JFileChooser jfc=new JFileChooser(); //以默认形式的打开文件的对话框 jfc.showOpenDialog(null); jfc.setDialogTitle("Open..."); jfc.setVisible(true); //get opened file's absolutePath String filePath=jfc.getSelectedFile().getAbsolutePath(); //字符流 FileReader fr=null; BufferedReader br=null; try { fr=new FileReader(filePath); br=new BufferedReader(fr); String s=""; String allS=""; while((s=br.readLine())!=null){ if(!allS.equals("")){ allS+="\r\n"; } allS+=s; } this.jta.setText(allS); } catch (Exception e1) { // TODO Auto-generated catch block e1.printStackTrace(); }finally{ try { fr.close(); br.close(); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } } if(e.getActionCommand().equals("File_Save")){ JFileChooser jfc=new JFileChooser(); jfc.showSaveDialog(null); jfc.setDialogTitle("Save as..."); jfc.setVisible(true); String saveFilePath=jfc.getSelectedFile().getAbsolutePath(); //System.out.println(saveFilePath); FileWriter fw=null; BufferedWriter bw=null; try { fw=new FileWriter(saveFilePath); bw=new BufferedWriter(fw); //System.out.println(this.jta.getText()); bw.write(this.jta.getText()); } catch (Exception e2) { // TODO: handle exception e2.printStackTrace(); }finally{ try { fw.close(); bw.close(); } catch (Exception e3) { // TODO: handle exception e3.printStackTrace(); } } } } } 不清楚原因，在将JTextArea中的文本保存到要保存的文件中时没能正确保存！ 请大家帮忙解决，代码是没有出错的，逻辑也没错呀！到底是怎么回事，想了很久还是没能解决！  

Answer 1

try {

fw.close();

bw.close();
}

改成：

try {

bw.close();

fw.close();

}

顺序反了，先关闭子类，再关闭父类