android OutputStreamWriter写入指定文件中，文件为空

public File writeText2SDFromInput(String path , String fileName , InputStream input)

{

File file = null ;

StringBuffer sb = new StringBuffer() ;

BufferedReader br = null ;

OutputStreamWriter osw = null ;

OutputStream os = null ;

br = new BufferedReader(new InputStreamReader(input));

String temp = null;

try {

createSDDir(path);

file = createSDFile(path, fileName);

os = new FileOutputStream(file);

while((temp = br.readLine()) != null){

sb.append(temp);

sb.append("/n");

}

//以GB2312的编码格式往指定文件中写入东西，这样可以避免中文乱码的问题

osw = new OutputStreamWriter(os,"GB2312");

osw.write(sb.toString(),1,sb.toString().length() - 1);

osw.flush();

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

} finally{

try {

osw.close();

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

return file;

}

用OutputStreamWriter 往SDCARD中写入时为空,因为我少写了上述代码中着重的那一行代码。

flush这个方法的作用是把缓冲区的数据强行输出,如果你不flush就可能会没有真正输出。而我运气就很差，每次都没有输出。。。