java 将服务器端的文件 下载到 客服端 指定目录下？

public void down() throws MalformedURLException, IOException{
        InetAddress addr = InetAddress.getLocalHost();
        String ip = addr.getHostAddress().toString();// 获得本机IP
        //String port = request.getLocalPort();
        System.out.println(ip);
        String filepath  = "C:/WINDOWS/system32/bb.dll";
        File f = new File(filepath);
        if(f.exists()){
            System.out.println("------bb已存在");
        }else{
            
            InputStream ios = new URL("http://"+ip+":8080/project/bb/bb.dll").openConnection().getInputStream();
            BufferedOutputStream bout=new BufferedOutputStream(new FileOutputStream("C:/WINDOWS/system32"));
            
            byte buff[]=new byte[1024];
            int count;
            while((count=ios.read(buff))>0){
                bout.write(buff, 0, count);
            }
            ios.close();
            bout.close();
        }