FileChooser读取和保存文件

File file=null;
int result;
if(e.getActionCommand().equals("新建文件")){
fileChooser.setApproveButtonText("确定");
fileChooser.setDialogTitle("打开文件");
result=fileChooser.showOpenDialog(f);
textArea.setText("");
if(result==JFileChooser.CANCEL_OPTION)
{
label.setText("您没有选择任何文件");
}else if(result==JFileChooser.APPROVE_OPTION)
{
file=fileChooser.getSelectedFile();
label.setText("您选择打开的文件名称为："+file.getName());

}

FileInputStream fileInStream=null;
if(file!=null){
try{
fileInStream=new FileInputStream(file);
}catch(FileNotFoundException fe){
label.setText("File Not Found");
return;
}
int readbyte;
try
{
while((readbyte=fileInStream.read())!=-1){
textArea.append(String.valueOf((char)readbyte));
}
}catch(IOException ioe){
label.setText("读取文件错误");
}finally{
try{
if(fileInStream!=null){
fileInStream.close();
}

}catch(IOException ioe2){}
}
}
}
if(e.getActionCommand().equals("存储文件")){
result=fileChooser.showSaveDialog(f);
file=null;
String fileName;
if(result==JFileChooser.APPROVE_OPTION){
file=fileChooser.getSelectedFile();
label.setText("您选择的文件名称为："+file.getName());
}else if(result==JFileChooser.CANCEL_OPTION){
label.setText("您没有选择任何文件");
}

FileOutputStream fileOutStream=null;
if(file!=null){
try{
fileOutStream=new FileOutputStream(file);
}catch(FileNotFoundException fe){
label.setText("File Not Found");
return;
}
String content=textArea.getText();
try{
fileOutStream.write(content.getBytes());
}catch(IOException ioe){
label.setText("写入文件错误");
}finally{
try{
if(fileOutStream!=null){
fileOutStream.close();
}
}catch(IOException ioe2){}
}
}
}