IO流制定格式的读写

从一个文件读取GBK编码的数据：
BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(saveFilename),”GB2312”));

往一个文件写入GBK编码数据
PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(new FileOutputStream(saveFilename),”GB2312”)));
out.Writer(“要写的东西”)