我使用下面的代码将图像上传到服务器，但它正在压缩图像以降低分辨率。
class ImageUploadTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
ByteArrayBody bab;
ByteArrayOutputStream bos = new ByteArrayOutputStream();
URL url = new URL(webAddressToPost);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("enctype", "multipart/form-data");
MultipartEntity entity = new MultipartEntity();
signature_image.compress(Bitmap.CompressFormat.PNG, 100, bos);
byte[] data = bos.toByteArray();
bab = new ByteArrayBody(data, contactNo+"_Signature.png");
entity.addPart("file", bab);
conn.addRequestProperty(entity.getContentType().getName(), entity.getContentType().getValue());
OutputStream os = conn.getOutputStream();
entity.writeTo(conn.getOutputStream());
os.close();
conn.connect();
}
}
如何将高分辨率图像上传到服务器而不是压缩图像？
答案 0 :(得分：1)
您的代码将压缩图像，然后上传到服务器。而是使用下面的代码将原始分辨率的图像上传到服务器。
class ImageUploadTask extends AsyncTask<String, Integer, String> {
private String webAddressToPost = "WRITE_YOUR_API_URL_TO_UPLOAD_IMAGE";
@Override
protected void onPreExecute() {
}
@Override
protected String doInBackground(String... params) {
String image_file_type = params[0];
String file_name = params[1];
int i=1;
if (i==1){
int day, month, year;
int second, minute, hour;
GregorianCalendar date = new GregorianCalendar();
day = date.get(Calendar.DAY_OF_MONTH);
month = date.get(Calendar.MONTH);
year = date.get(Calendar.YEAR);
second = date.get(Calendar.SECOND);
minute = date.get(Calendar.MINUTE);
hour = date.get(Calendar.HOUR);
String name=(hour+""+minute+""+second+""+day+""+(month+1)+""+year);
String tag=name+".jpg";
fileName = frontCameraImageUrl.replace(frontCameraImageUrl,tag);
sourceFile = new File(frontCameraImageUrl);
HttpURLConnection conn = null;
DataOutputStream dos = null;
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1 * 1024 * 1024;
if (!sourceFile.isFile()) {
Log.e("uploadFile", "Source File not exist :");
return "0";
}
else
{
try {
// open a URL connection to the Servlet
FileInputStream fileInputStream = new FileInputStream(sourceFile);
URL url = new URL(webAddressToPost);
// 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);
dos = new DataOutputStream(conn.getOutputStream());
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"uploaded_file\";filename=\""
+ file_name + "\"" + 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)
int serverResponseCode = conn.getResponseCode();
String serverResponseMessage = conn.getResponseMessage();
Log.i("uploadFile", "HTTP Response is : "
+ serverResponseMessage + ": " + serverResponseCode);
if(serverResponseCode == 200){
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(MainActivity.this, "File Upload Complete.", Toast.LENGTH_SHORT).show();
}
});
}
//close the streams //
fileInputStream.close();
dos.flush();
dos.close();
} catch (MalformedURLException ex) {
ex.printStackTrace();
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(MainActivity.this, "MalformedURLException", Toast.LENGTH_SHORT).show();
}
});
Log.e("Upload file to server", "error: " + ex.getMessage(), ex);
} catch (Exception e) {
e.printStackTrace();
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(MainActivity.this, "Got Exception : see logcat ", Toast.LENGTH_SHORT).show();
}
});
Log.e("Upload Exception", "Exception : " + e.getMessage(), e);
}
return "serverResponseCode";
}
}
return null;
}
@Override
protected void onPostExecute(String result) {
Toast.makeText(getApplicationContext(), "file uploaded",
Toast.LENGTH_LONG).show();
}
}