我正在做一个项目,我必须使用URL将
Image上传到服务器.
但是当我上传文件时,文件在服务器中已损坏,当我打开文件时,它显示错误消息“文件已损坏”.我怎样才能克服这个问题.
但是当我上传文件时,文件在服务器中已损坏,当我打开文件时,它显示错误消息“文件已损坏”.我怎样才能克服这个问题.
这是我的代码:
String lineEnd = "\r\n"; String twoHyphens = "--"; String boundary = "*****"; try { // ------------------ CLIENT REQUEST Log.e("Upload","Inside second Method"); FileInputStream fileInputStream = new FileInputStream(new File(sel_img_name)); // open a URL connection to the Servlet URL url = new URL(IpAddress+"ImageUpload/"+token+"/"+name_sel_image+"%7C"+extension); // Open a HTTP connection to the URL conn = (HttpURLConnection) url.openConnection(); // Allow Inputs conn.setDoInput(true); // Allow Outputs conn.setDoOutput(true); // Don't use a cached copy. conn.setUseCaches(false); // Use a post method. conn.setRequestMethod("POST"); conn.setRequestProperty("Connection","Keep-Alive"); conn.setRequestProperty("Content-Type","multipart/form-data;boundary=" + boundary); DataOutputStream dos = new DataOutputStream(conn.getoutputStream()); dos.writeBytes(twoHyphens + boundary + lineEnd); dos.writeBytes("Content-disposition: post-data; name=uploadedfile;filename=" + name_sel_image + "" + lineEnd); dos.writeBytes(lineEnd); //Log.e(Tag,"Headers are written"); // create a buffer of maximum size int bytesAvailable = fileInputStream.available(); int maxBufferSize = 1000; // int bufferSize = Math.min(bytesAvailable,maxBufferSize); byte[] buffer = new byte[bytesAvailable]; // read file and write it into form... int bytesRead = fileInputStream.read(buffer,bytesAvailable); while (bytesRead > 0) { dos.write(buffer,bytesAvailable); bytesAvailable = fileInputStream.available(); bytesAvailable = Math.min(bytesAvailable,maxBufferSize); bytesRead = fileInputStream.read(buffer,bytesAvailable); } // send multipart form data necesssary after file data... dos.writeBytes(lineEnd); dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd); // close streams //Log.e(Tag,"File is written"); fileInputStream.close(); dos.flush(); dos.close(); } catch (MalformedURLException ex) { Log.e(Tag,"error: " + ex.getMessage(),ex); } catch (IOException ioe) { Log.e(Tag,"error: " + ioe.getMessage(),ioe); } try { BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream())); String line; while ((line = rd.readLine()) != null) { Log.i("Response",line); } rd.close(); } catch (IOException ioex) { Log.e("MediaPlayer","error: " + ioex.getMessage(),ioex); }
解决方法
不要写连字符,边界和lineEnd以查看您的服务器是否支持它.
dos.writeBytes(twoHyphens boundary twoHyphens lineEnd);
dos.writeBytes(twoHyphens boundary twoHyphens lineEnd);
我之前遇到过类似的问题,事实证明服务器正在使用连字符,lineEnd作为数据的一部分.