我需要在不使用任何库的情况下将图像的Arraylist
上载到服务器。我正在使用Asynctask
上传单个图像,并且在httpurlconnection multipart / form-data的帮助下它可以完美地工作。现在,我需要更改代码以使用Arraylist<String>
上传任何类型的多个文件,但是我的问题是现有代码的FileinputStream
不支持arraylist,而且我不知道要用什么代替Fileinputstream
将arraylist上传到服务器,我也不想为此使用任何库。
public class multipart_test extends AsyncTask<Void,Void,String> {
Context context;
String Images;
public static final String TAG = "###Image Uploading###";
public multipart_test(Context context,String Upload_Images) {
this.context = context;
this.Images = Upload_Images;
}
@Override
protected String doInBackground(Void... params) {
BufferedReader reader;
String WebPath = null;
try {
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1024 * 1024;
//todo change URL as per client ( MOST IMPORTANT )
URL url = new URL("10.0.0.1/uploadMultipart.php");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
// Allow Inputs & Outputs.
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setUseCaches(false);
// Set HTTP method to POST.
connection.setRequestMethod("POST");
connection.setRequestProperty("Connection", "Keep-Alive");
connection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
FileInputStream fileInputStream;
DataOutputStream outputStream;
outputStream = new DataOutputStream(connection.getOutputStream());
outputStream.writeBytes(twoHyphens + boundary + lineEnd);
outputStream.writeBytes("Content-Disposition: form-data; name=\"reference\""+ lineEnd);
outputStream.writeBytes(lineEnd);
//outputStream.writeBytes("my_refrence_text");
outputStream.writeBytes(lineEnd);
outputStream.writeBytes(twoHyphens + boundary + lineEnd);
outputStream.writeBytes("Content-Disposition: form-data; name=\"uploadFile\";filename=\"" + "profileImage" +"\"" + lineEnd);
outputStream.writeBytes(lineEnd);
//Dummy ArrayList for upload
ArrayList<String> uploadFiles = new ArrayList<>();
uploadFiles.add(Images);
uploadFiles.add(Images);
uploadFiles.add(Images);
uploadFiles.add(Images);
fileInputStream = new FileInputStream(uploadFiles); // NOT SUPPORTING ARRAYLIST HERE
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
// Read file
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
outputStream.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
outputStream.writeBytes(lineEnd);
outputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
fileInputStream.close();
}
// Responses from the server (code and message)
int serverResponseCode = connection.getResponseCode();
String result = null;
if (serverResponseCode == 200) {
StringBuilder s_buffer = new StringBuilder();
InputStream is = new BufferedInputStream(connection.getInputStream());
BufferedReader br = new BufferedReader(new InputStreamReader(is));
String inputLine;
while ((inputLine = br.readLine()) != null) {
s_buffer.append(inputLine);
}
result = s_buffer.toString();
}
connection.getInputStream().close();
outputStream.flush();
outputStream.close();
if (result != null) {
Log.d("result_for upload", result);
}
return WebPath;
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
我还试图将FileInputStream
放入循环中,但我不希望将图像上传到多个请求中。我的服务器require的应用程序对n个图像发出单个请求。任何帮助将不胜感激,但无需使用任何库
注意,如果此代码正确地与HttpURLConnection一起使用,我还没有尝试过,但应该可以。
根据我从互联网上所读到的内容,您仍然可以使用您提到的循环,但需要进行一些修改。