java io

FileWriter fw = new FileWriter(filepath);
FileWriter使用服务器默认的Encoding保存数据，如果要保存为UTF-8格式，就必须要用OutputStreamWriter。
OutputStreamWriter out = new OutputStreamWriter(
new FileOutputStream("c:/"+fileName),"UTF-8");
out.write(ss);out.flush();out.close();

InputStream inputStream = new FileInputStream("c:/"+fileName);