J#-打开一个文件

JFileChooser fc = new JFileChooser("F:");

int resultOpen = fc.showOpenDialog(this);
if(resultOpen == 0)
{
    try
    {
        File f = fc.getSelectedFile();//获得选中的文件
                    
        FileReader fr = new FileReader(f);
        BufferedReader br = new BufferedReader(fr);
        String str;
        while((str=br.readLine())!=null)
        {
            txt.append(str+"\n");
        }
        br.close();
        fr.close();
    }
    catch(Exception ee)
    {
        ee.getStackTrace();
    }
}