Saving image to server directory using SpringBoot with Android

I am developing an application that sends images to the server. I am wanting to save the photos coming from the application in the local server side folder. For this I am using SpriingBoot for API development and on Android I am submitting the request via Json using the Volley library.

I already tried to convert the string that came in the request to byte [] and then save it to an Image.io format file, but it is not possible to save the image. Can someone help me save the image to the local server directory?

Code android:

public class MainActivity extends AppCompatActivity {

public static final String REGISTER_URL = "http://192.168.1.8:8080/api/paciente";
public static final String KEY_IMAGE = "foto";
String foto = "null";
public static final String TAG = "LOG";
private ProgressDialog progressDialog;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Button enviar = (Button) findViewById(R.id.enviar);


    enviar.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            registerForms();

        }
    });
}

public void tirarFoto(View view) {
    Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
    startActivityForResult(intent, 0);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (data != null) {
        Bundle bundle = data.getExtras();
        if (bundle != null) {
            Bitmap img = (Bitmap) bundle.get("data");
            ByteArrayOutputStream stream = new ByteArrayOutputStream();
            img.compress(Bitmap.CompressFormat.JPEG, 100, stream);
            foto = Base64.encodeToString(stream.toByteArray(), Base64.DEFAULT);
            Toast toast = Toast.makeText(getApplicationContext(), "Foto anexada", Toast.LENGTH_LONG);
            toast.show();
        }
    }
}


@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
}

public void registerForms() {

    StringRequest stringRequest = new StringRequest(Request.Method.POST, REGISTER_URL, new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {

            if (response.contains("Erro")) {
                //progressDialog.dismiss();
                Toast.makeText(MainActivity.this, "Erro ao enviar", Toast.LENGTH_LONG).show();
                Log.i(TAG, "Lat: " + "Caiu aqui");
            } else {
                //progressDialog.dismiss();
                Intent intent = new Intent(MainActivity.this, MainActivity.class);
                Toast.makeText(MainActivity.this, "Enviado com sucesso!", Toast.LENGTH_LONG).show();
                startActivity(intent);
            }

        }
    },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                  //progressDialog.dismiss();
                    Toast.makeText(MainActivity.this, "Enviado com sucesso!", Toast.LENGTH_LONG).show();
                    Log.i(TAG, "String: " + foto);
                }
            }) {

        @Override
        protected Map<String, String> getParams() throws AuthFailureError{
            Map<String, String> map = new HashMap<String, String>();
            map.put(KEY_IMAGE, foto);
            Log.i(TAG, "Lat: " + map);
            return map;

        }
    };
    RequestQueue requestQueue = Volley.newRequestQueue(this);
    requestQueue.add(stringRequest);
}
}

Code API:

Service:

@RequestMapping(value = "/paciente", method = RequestMethod.POST, consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE, produces = {
        MediaType.APPLICATION_ATOM_XML_VALUE, MediaType.APPLICATION_JSON_VALUE, "application/json" })
public @ResponseBody Paciente cadastraPaciente(@Valid Paciente paciente) throws Exception {
    byte[] imgBytes = Base64.decodeBase64(foto.getBytes());
    try{
        FileOutputStream fos = new FileOutputStream("C:/Users/carlo/Downloads/SisCAF/images/myImage1.png");
         fos.write(imgBytes);
         FileDescriptor fd = fos.getFD();
         fos.flush();
         fd.sync();
         fos.close(); 
     }


    return paciente;
}

As it is in the code, returns that the image attribute is null

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