Android使用HttpURLConnection实现文件上传(包括图片)

1.文件上传完整代码

下面是完整的文件上传代码，复制即可使用。注意要开启子线程运行

public class UploadFileTask {/*** 上传文件到服务器，并返回服务器相应结果* @param requestURL 服务器的地址* @param imageUri 文件的Uri* @param context* @return 服务器返回的结果*/public String uploadFile(String requestURL, Uri imageUri, Context context) {HttpURLConnection connection = null;DataOutputStream outputStream = null;InputStream inputStream = null;String boundary = "*****" + System.currentTimeMillis() + "*****";String lineEnd = "\r\n";String twoHyphens = "--";try {InputStream fileInputStream = context.getContentResolver().openInputStream(imageUri);URL url = new URL(requestURL);connection = (HttpURLConnection) url.openConnection();connection.setDoInput(true);connection.setDoOutput(true);connection.setUseCaches(false);connection.setRequestMethod("POST");connection.setRequestProperty("Connection", "Keep-Alive");connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);outputStream = new DataOutputStream(connection.getOutputStream());outputStream.writeBytes(twoHyphens + boundary + lineEnd);outputStream.writeBytes("Content-Disposition: form-data; name=\"uploaded_file\";filename=\""+ imageUri.getLastPathSegment() + "\"" + lineEnd);outputStream.writeBytes(lineEnd);int bytesAvailable = fileInputStream.available();int bufferSize = Math.min(bytesAvailable, 1024 * 1024);byte[] buffer = new byte[bufferSize];int bytesRead;while ((bytesRead = fileInputStream.read(buffer, 0, bufferSize)) != -1) {outputStream.write(buffer, 0, bytesRead);}outputStream.writeBytes(lineEnd);outputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);outputStream.flush();fileInputStream.close();outputStream.close();// 检查服务器响应int serverResponseCode = connection.getResponseCode();String serverResponseMessage = connection.getResponseMessage();if (serverResponseCode == HttpURLConnection.HTTP_OK) {inputStream = connection.getInputStream();String result = convertStreamToString(inputStream);Log.d("Upload Success", "Response: " + result);inputStream.close();return result;} else {Log.d("Upload Error", "Response Code: " + serverResponseCode + " Message: " + serverResponseMessage);}} catch (Exception e) {e.printStackTrace();} finally {if (inputStream != null) {try {inputStream.close();} catch (IOException e) {e.printStackTrace();}}if (connection != null) {connection.disconnect();}}return "";}private String convertStreamToString(InputStream is) {Scanner s = new Scanner(is).useDelimiter("\\A");return s.hasNext() ? s.next() : "";}
}