读取70开头的xml,gbk转成utf-8

 //读取70开头的xml,gbk转成utf-8
            //InputStream  is = new FileInputStream(super.getFile());//文件读取
            //InputStreamReader   isr = new InputStreamReader(is, "gbk");//解码
           String newfile = super.getFilePath()+"\\"+"70.xml";
            OutputStream os = new FileOutputStream(newfile);//文件输出
            OutputStreamWriter osw = new OutputStreamWriter(os, "utf-8");//开始编码
            char[] c = new char[1024];//缓冲
            int length = 0;
            while(true){
                length = isr.read(c);
                if(length == -1){
                    break;
                }
                //System.out.println(new String(c, 0, length));
                osw.write(c, 0, length);
                osw.flush();
            }
            isr.close();
            osw.close();