我正在尝试使用Android Volley将用户选择的图像上传到服务器。我已经阅读了这些问题的其他答案，但他们建议使用多部分请求，但我想使用Volley。
我正在尝试上传用户为个人资料照片选择的图像。我提供userID以String形式识别用户和图像，图像将根据userID存储在特定目录中。如果操作成功，服务器将为true，否则为false。
以下是上传图片的功能
private void uploadImage() {
//Showing the progress dialog
final ProgressDialog loading = ProgressDialog.show(this, "Uploading...", "Please wait...", false, false);
String UPLOAD_URL = "http://parque.890m.com/upload-user-img.php";
StringRequest stringRequest = new StringRequest(Request.Method.POST, UPLOAD_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String s) {
//Dismissing the progress dialog
Log.d("response", s);
loading.dismiss();
//Showing toast message of the response
if (s.equals("true")) {
Log.d("upload_success", "successful upload : " + s);
} else if (s.equals("false")) {
Log.d("upload_failure", "successful upload : " + s);
} else {
Log.d("connection_failure", "connection failed");
}
Toast.makeText(UserProfile.this, s, Toast.LENGTH_LONG).show();
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
//Dismissing the progress dialog
loading.dismiss();
//Showing toast
Log.d("upload_error", "" + volleyError.getMessage());
Toast.makeText(UserProfile.this, volleyError.getMessage(), Toast.LENGTH_LONG).show();
}
}) {
@Override
protected Map<String, String> getParams() throws AuthFailureError {
//Converting Bitmap to String
String image = getStringImage(bitmap);
Log.d("image_string", "" + image);
//Getting Image Name
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(UserProfile.this);
String name = preferences.getString("id", null);
//Creating parameters
Map<String, String> params = new Hashtable<String, String>();
//Adding parameters
params.put(KEY_IMAGE, image);
params.put(KEY_NAME, name);
//returning parameters
Log.d("params : ", "" + params.toString());
return params;
}
};
//Creating a Request Queue
RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
//Adding request to the queue
stringRequest.setRetryPolicy(new DefaultRetryPolicy(DefaultRetryPolicy.DEFAULT_TIMEOUT_MS * 2, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
requestQueue.add(stringRequest);
}*/
我编写了一个将图像转换为字符串的函数
public String getStringImage(Bitmap bmp) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] imageBytes = baos.toByteArray();
return encodeToString(imageBytes, DEFAULT);
}
服务器端代码
<?php
require_once 'inc/connection.inc.php';
if(isset($_POST['user'])){
$success = false;
$image = $_POST['image'];
$name = $_POST['user'];
$path = "uploads/$name";
$actualpath = "http://parque.890m.com/$path";
$query = "UPDATE `users` SET `photo_url` = $actualpath WHERE `user_id`= $name";
if(mysqli_query($connection,$query)){
file_put_contents($path,base64_decode($image));
$success = true;
}
echo json_encode($success);
mysqli_close($connection);
}
服务器在上传图片时返回false，但图片未上传。
答案 0 :(得分：0)
您可以在使用排球时使用多部分请求执行此操作：
首先创建一个名为：MultipartRequest的文件，如下所示：
public class MultipartRequest extends Request<String> {
private MultipartEntityBuilder entity = MultipartEntityBuilder.create();
private final Response.Listener<String> mListener;
private final File file;
private final HashMap<String, String> params;
public MultipartRequest(String url, Response.Listener<String> listener, Response.ErrorListener errorListener, File file, HashMap<String, String> params)
{
super(Method.POST, url, errorListener);
mListener = listener;
this.file = file;
this.params = params;
buildMultipartEntity();
buildMultipartEntity2();
}
private void buildMultipartEntity()
{
entity.addBinaryBody(KEY_IMAGE, file, ContentType.create("image/jpeg"), file.getName());
entity.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
entity.setLaxMode().setBoundary("xx").setCharset(Charset.forName("UTF-8"));
try
{
for ( String key : params.keySet() ) {
entity.addPart(key, new StringBody(params.get(key)));
}
}
catch (UnsupportedEncodingException e)
{
VolleyLog.e("UnsupportedEncodingException");
}
}
@Override
public String getBodyContentType()
{
return entity.build().getContentType().getValue();
}
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> headers = super.getHeaders();
if (headers == null
|| headers.equals(Collections.emptyMap())) {
headers = new HashMap<String, String>();
}
headers.put("Accept", "application/json");
return headers;
}
@Override
public byte[] getBody() throws AuthFailureError
{
ByteArrayOutputStream bos = new ByteArrayOutputStream();
try
{
entity.build().writeTo(bos);
}
catch (IOException e)
{
VolleyLog.e("IOException writing to ByteArrayOutputStream");
}
return bos.toByteArray();
}
/**
* copied from Android StringRequest class
*/
@Override
protected Response<String> parseNetworkResponse(NetworkResponse response) {
String parsed;
try {
parsed = new String(response.data, HttpHeaderParser.parseCharset(response.headers));
} catch (UnsupportedEncodingException e) {
parsed = new String(response.data);
}
return Response.success(parsed, HttpHeaderParser.parseCacheHeaders(response));
}
@Override
protected void deliverResponse(String response) {
mListener.onResponse(response);
}}
此外，我们正在使用多部分请求，因为我们需要在此处上传文件（图像）。因此，请使用此代码将图像作为文件上载。现在，您正在制作StringRequest，只需按如下方式生成Multipart Request：
public void uploadImage()
{
try {
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Loading...");
pDialog.show();
HashMap params = new HashMap<String, String>();
params.put(KEY_NAME, name);
MultipartRequest sr = new MultipartRequest( UPLOAD_URL, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
if ((pDialog != null) && pDialog.isShowing()) {
pDialog.dismiss();
}
Log.d("file", f + "");
Log.d("", ".......response====" + response.toString());
////////
try {
JSONObject object = new JSONObject(response);
String serverCode = object.getString("code");
if (serverCode.equalsIgnoreCase("0")) {
}
if (serverCode.equalsIgnoreCase("1")) {
try {
if ("1".equals(serverCode)) {
JSONObject object1 = object.getJSONObject("data");
}
}
catch (Exception e) {
e.printStackTrace();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
if ((pDialog != null) && pDialog.isShowing()) {
pDialog.dismiss();
}
;
// VolleyLog.d("", "Error: " + error.getMessage());
if (error instanceof TimeoutError || error instanceof NoConnectionError) {
Toast.makeText(getActivity(), "Timeout Error",
Toast.LENGTH_LONG).show();
} else if (error instanceof AuthFailureError) {
VolleyLog.d("", "" + error.getMessage() + "," + error.toString());
} else if (error instanceof ServerError) {
VolleyLog.d("", "" + error.getMessage() + "," + error.toString());
} else if (error instanceof NetworkError) {
VolleyLog.d("", "" + error.getMessage() + "," + error.toString());
} else if (error instanceof ParseError) {
VolleyLog.d("", "" + error.getMessage() + "," + error.toString());
}
}
}, f, params);
sr.setRetryPolicy(new DefaultRetryPolicy(100000*2,DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
sr.setShouldCache(true);
VolleySingleton.getInstance(getActivity()).addToRequestQueue(sr);
} catch (Exception e) {
e.printStackTrace();
}
}