Dividir arquivo CSV em arquivos menores

splitCSV

        String charset = "Cp1252";
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(new FileInputStream("CAMINHO ARQUIVO ORIGEM"), charset));
        String line="";
        String destiny="CAMINHO ARQUIVO DESTINO";
        int count = 1;
        int fileSize = 0;
        OutputStreamWriter fos = new OutputStreamWriter(new FileOutputStream(destiny+count+".csv"),charset);
	
        while((line = bufferedReader.readLine()) != null) {
            if(fileSize + line.getBytes().length > 50 * 1024 * 1024){
                fos.flush();
                fos.close();
                count++;
            
                fos = new OutputStreamWriter(new FileOutputStream(destiny+count+".csv"),charset);
                fos.write(line+"\n");
                fileSize = line.getBytes().length;
            }else{
                fos.write(line+"\n");
                fileSize += line.getBytes().length;
            }
        }       
        fos.flush();
        fos.close();
        bufferedReader.close();