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();