FileWriter fw=null;
BufferedWriter bw=null;
try{
fw = new FileWriter(path, true);
bw= new BufferedWriter(fw);
bw.write(str);
bw.flush(); // 刷新该流的缓冲
bw.close();
fw.close();
}catch(Exception e){
e.printStackTrace();
try {
bw.close();
fw.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
}
}