我正在开展一个项目，我需要将图像映射到Bitmap并将其上传到服务器，我无法完全理解它。
这就是我现在正在使用的内容（忽略JSONObject的东西，服务器将其作为响应返回，我还没有构建该部分）：
private JSONObject uploadImagesFromMemory(Bitmap bitmap) {
if (getSelf() == null) {
try {
return new JSONObject("");
} catch (JSONException e) {
e.printStackTrace();
}
}
HttpURLConnection connection = null;
try {
URL url = new URL("REMOVED");
connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setUseCaches(false);
connection.setRequestMethod("POST");
connection.setRequestProperty("Connection", "Keep-Alive");
connection.setRequestProperty("Content-Type", "multipart/form-data;");
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
OutputStream outputStream = connection.getOutputStream();
outputStream.write(byteArray);
outputStream.flush();
outputStream.close();
connection.disconnect();
return new JSONObject("{\"responseCode:\"1}");
} catch (Exception ex) {
//Exception handling
}
return null;
}
我不知道如何将文件的上传名称/变量设置为＆＃39; toUpload＆＃39;这是服务器所需要的。
将采取任何建议，谢谢。
答案 0 :(得分：1)
我改变了我的代码（服务器和客户端）并且它现在正在工作。
服务器只获取Base64数据并将其转换为PNG文件。然后它完成之前所做的事情并保存它：
if (isset($_POST['base64'])) {
$data = $_POST['base64'];
$data = base64_decode($data);
$status = file_put_contents("profiles/$uuid.png", $data);
if ($status == false) {
echo(json_encode(array(
"response" => "Failed to change profile picture.",
"responseCode" => "0"
)));
} else {
echo(json_encode(array(
"response" => "Successfully changed your profile picture!",
"responseCode" => "1"
)));
}
}
客户端获取位图，并将其转换为Base64：
public String toBase64(Bitmap bitmap) {
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream);
byte[] byteArray = byteArrayOutputStream .toByteArray();
return Base64.encodeToString(byteArray, Base64.DEFAULT);
}
然后，使用Volley，上传它：
final ProgressDialog loading = ProgressDialog.show(SettingsActivity.this,"Uploading...","Please wait...",false,false);
StringRequest stringRequest = new StringRequest(Request.Method.POST, "REMOVED",
new Response.Listener<String>() {
@Override
public void onResponse(String s) {
//Dismissing the progress dialog
loading.dismiss();
//Showing toast message of the response
try {
JSONObject jsonObject = new JSONObject(s);
int responseCode = Integer.parseInt(jsonObject.getString("responseCode"));
String response = jsonObject.getString("response");
if (responseCode == 1) {
Toast.makeText(SettingsActivity.this, response, Toast.LENGTH_LONG).show();
} else {
Toast.makeText(SettingsActivity.this, "Error: " + response, Toast.LENGTH_LONG).show();
}
} catch (Exception ex) {
Toast.makeText(SettingsActivity.this, "Failed to upload.", Toast.LENGTH_LONG).show();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
//Dismissing the progress dialog
loading.dismiss();
//Showing toast
try {
JSONObject jsonObject = new JSONObject(volleyError.getMessage());
int responseCode = Integer.parseInt(jsonObject.getString("responseCode"));
String response = jsonObject.getString("response");
if (responseCode == 1) {
Toast.makeText(SettingsActivity.this, response, Toast.LENGTH_LONG).show();
} else {
Toast.makeText(SettingsActivity.this, "Error: " + response, Toast.LENGTH_LONG).show();
}
} catch (Exception ex) {
Toast.makeText(SettingsActivity.this, "Failed to upload.", Toast.LENGTH_LONG).show();
}
}
}){
@Override
protected Map<String, String> getParams() throws AuthFailureError {
//Converting Bitmap to String
String image = Memer.getMemer().toBase64(bitmap);
//Getting Image Name
//Creating parameters
Map<String,String> params = new Hashtable<>();
//Adding parameters
params.put("base64", image);
//returning parameters
return params;
}
};
//Creating a Request Queue
RequestQueue requestQueue = Volley.newRequestQueue(SettingsActivity.this);
//Adding request to the queue
requestQueue.add(stringRequest);
希望我能像其他人一样帮助其他人解决这个问题：）
答案 1 :(得分：0)
我发现最简单的方法是使用MultipartEntityBuilder（需要使用apache库）。使用该代码是：
MultipartEntityBuilder builder = MultipartEntityBuilder.create();
builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
for (Map.Entry<String, File> entry : entities.entrySet())
{
builder.addBinaryBody(entry.getKey(), entry.getValue(), ContentType.create("image/jpg"), entry.getValue().getName());
}
mMultipartEntity = builder.build();
ByteArrayOutputStream bos = new ByteArrayOutputStream();
try {
mMultipartEntity.writeTo(bos);
}
catch (IOException ex) {
}
return bos.toByteArray();
Android切换到的URLConnection库非常适合简单的查询，但似乎没有相当多的实体支持。
答案 2 :(得分：0)
如果您相应地修改代码，这将有助于您
FileInputStream fileInputStream = new FileInputStream(sourceFile);
URL url = new URL(upLoadServerUri+"&user_id="+userId);
// Open a HTTP connection to the URL
conn = (HttpURLConnection) url.openConnection();
conn.setDoInput(true); // Allow Inputs
conn.setDoOutput(true); // Allow Outputs
conn.setUseCaches(false); // Don't use a Cached Copy
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("ENCTYPE", "multipart/form-data");
conn.setRequestProperty("Content-Type","multipart/form-data;boundary=" + boundary);
conn.setRequestProperty("uploaded_file", fileName);
//conn.setRequestProperty("uname", username);
//conn.setRequestProperty("uid", userId);
dos = new DataOutputStream(conn.getOutputStream());
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"edit_pro_pic\";filename=\"" + fileName + "\"" + lineEnd);
dos.writeBytes(lineEnd);
// create a buffer of maximum size
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
// read file and write it into form...
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
dos.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
// send multipart form data necesssary after file data.
dos.writeBytes(lineEnd);
dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
// Responses from the server (code and message)
serverResponseCode = conn.getResponseCode();
conn.getResponseMessage();
s = new Scanner(conn.getInputStream());
imageUrl = readResponse(s.next());
// close the streams //
fileInputStream.close();
dos.flush();
dos.close();
} catch (MalformedURLException ex) {
dialog.dismiss();
cancel(true);
ex.printStackTrace();
//Log.e("Upload file to server", "error: " + ex.getMessage(), ex);
} catch (Exception e) {
dialog.dismiss();
e.printStackTrace();
// Log.e("Upload file to server Exception","Exception : " + e.getMessage(), e);
}