Android and android Official Website

Android and android Official Website

Background

I have uploaded a lot of files to the java server on the Internet for a long time and found the files to be uploaded to php. The idea is similar to what I originally thought, that is, POST. Look at the code.

Php code

<? Php $ target_path = ". /upload/"; // Receiving File directory $ target_path = $ target_path. basename ($ _ FILES ['uploadfile'] ['name']); if (move_uploaded_file ($ _ FILES ['uploadfile'] ['tmp _ name'], $ target_path) {echo "The file ". basename ($ _ FILES ['uploadfile'] ['name']). "has been uploaded";} else {echo "There was an error uploading the file, please try again! ". $ _ FILES ['uploadfile'] ['error'];}?>

Android code

Main upload code:

Private void uploadFile (String uploadUrl) {String end = "\ r \ n"; String twoHyphens = "--"; String boundary = "******"; try {URL url = new URL (uploadUrl); HttpURLConnection httpURLConnection = (HttpURLConnection) url. openConnection (); // http connection // you can specify the stream size for each transmission, this method can effectively prevent the phone from crashing due to insufficient memory // This method is used to enable the stream of HTTP Request body without internal buffering when the content length is unknown in advance. HttpURLConnection. setChunkedStreamingMode (128*1024); // 128 K // allow the input/output stream httpURLConnection. setDoInput (true); httpURLConnection. setDoOutput (true); httpURLConnection. setUseCaches (false); // use the POST method httpURLConnection. setRequestMethod ("POST"); httpURLConnection. setRequestProperty ("Connection", "Keep-Alive"); // Keep connected to httpURLConnection. setRequestProperty ("Charset", "UTF-8"); // code httpURLConnection. setRe QuestProperty ("Content-Type", "multipart/form-data; boundary =" + boundary); // POST transmits the previous encoding DataOutputStream dos = new DataOutputStream (httpURLConnection. getOutputStream (); // output stream dos. writeBytes (twoHyphens + boundary + end); dos. writeBytes ("Content-Disposition: form-data; name = \" uploadedfile \ "; filename = \" "+ srcPath. substring (srcPath. lastIndexOf ("/") + 1) + "\" "+ end); dos. writeBytes (end); FileInput Stream FD = new FileInputStream (srcPath); // file input Stream, written to the memory byte [] buffer = new byte [8192]; // 8 k int count = 0; // read the file while (count = Fi. read (buffer ))! =-1) {dos. write (buffer, 0, count);} FD. close (); dos. writeBytes (end); dos. writeBytes (twoHyphens + boundary + twoHyphens + end); dos. flush (); InputStream is = httpURLConnection. getInputStream (); // http input. The returned result is InputStreamReader isr = new InputStreamReader (is, "UTF-8"); BufferedReader br = new BufferedReader (isr); String result = br. readLine (); Toast. makeText (this, result, Toast. LENGTH_LONG ). show (); // output the result to dos. close (); is. close ();} catch (Exception e) {e. printStackTrace (); setTitle (e. getMessage ());}}

Because the time-consuming operations after Android 4.0 are required to be performed in non-UI threads, I will use the previous AsyncTask ~

AsyncTask Portal: http://www.cnblogs.com/yydcdut/p/3707960.html

In this class, put the upload operation in doInBackground, and you can see ProgressDialog to display the upload quantity:

// Read file            bytesRead = fileInputStream.read(buffer, 0, bufferSize);            while (bytesRead > 0) {                outputStream.write(buffer, 0, bufferSize);                length += bufferSize;                progress = (int) ((length * 100) / totalSize);                publishProgress(progress);                bytesAvailable = fileInputStream.available();                bufferSize = Math.min(bytesAvailable, maxBufferSize);                bytesRead = fileInputStream.read(buffer, 0, bufferSize);            }            outputStream.writeBytes(lineEnd);            outputStream.writeBytes(twoHyphens + boundary + twoHyphens                    + lineEnd);            publishProgress(100);

Also, pay attention to the permissions:

<uses-permission android:name="android.permission.INTERNET" />