你尝试过使用过吗？

con.setChunkedStreamingMode(1024);

这将帮助您将数据块化为特定大小，这样您就不必将整个文件保留在内存中。

更新：

尝试使用以下方法。我使用此方法上传一个没有Exception的80 MB文件。

public String sendFileToServer(String filename, String targetUrl) {

String response = "error";

Log.e("Image filename", filename);

Log.e("url", targetUrl);

HttpURLConnection connection = null;

DataOutputStream outputStream = null;

// DataInputStream inputStream = null;

String pathToOurFile = filename;

String urlServer = targetUrl;

String lineEnd = "\r\n";

String twoHyphens = "--";

String boundary = "*****";

DateFormat df = new SimpleDateFormat("yyyy_MM_dd_HH:mm:ss");

int bytesRead, bytesAvailable, bufferSize;

byte[] buffer;

int maxBufferSize = 1 * 1024;

try {

FileInputStream fileInputStream = new FileInputStream(new File(

pathToOurFile));

URL url = new URL(urlServer);

connection = (HttpURLConnection) url.openConnection();

// Allow Inputs & Outputs

connection.setDoInput(true);

connection.setDoOutput(true);

connection.setUseCaches(false);

connection.setChunkedStreamingMode(1024);

// Enable POST method

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);

String connstr = null;

connstr = "Content-Disposition: form-data; name=\"uploadedfile\";filename=\""

+ pathToOurFile + "\"" + lineEnd;

Log.i("Connstr", connstr);

outputStream.writeBytes(connstr);

outputStream.writeBytes(lineEnd);

bytesAvailable = fileInputStream.available();

bufferSize = Math.min(bytesAvailable, maxBufferSize);

buffer = new byte[bufferSize];

// Read file

bytesRead = fileInputStream.read(buffer, 0, bufferSize);

Log.e("Image length", bytesAvailable + "");

try {

while (bytesRead > 0) {

try {

outputStream.write(buffer, 0, bufferSize);

} catch (OutOfMemoryError e) {

e.printStackTrace();

response = "outofmemoryerror";

return response;

}

bytesAvailable = fileInputStream.available();

bufferSize = Math.min(bytesAvailable, maxBufferSize);

bytesRead = fileInputStream.read(buffer, 0, bufferSize);

}

} catch (Exception e) {

e.printStackTrace();

response = "error";

return response;

}

outputStream.writeBytes(lineEnd);

outputStream.writeBytes(twoHyphens + boundary + twoHyphens

+ lineEnd);

// Responses from the server (code and message)

int serverResponseCode = connection.getResponseCode();

String serverResponseMessage = connection.getResponseMessage();

Log.i("Server Response Code ", "" + serverResponseCode);

Log.i("Server Response Message", serverResponseMessage);

if (serverResponseCode == 200) {

response = "true";

}

String CDate = null;

Date serverTime = new Date(connection.getDate());

try {

CDate = df.format(serverTime);

} catch (Exception e) {

e.printStackTrace();

Log.e("Date Exception", e.getMessage() + " Parse Exception");

}

Log.i("Server Response Time", CDate + "");

filename = CDate

+ filename.substring(filename.lastIndexOf("."),

filename.length());

Log.i("File Name in Server : ", filename);

fileInputStream.close();

outputStream.flush();

outputStream.close();

outputStream = null;

} catch (Exception ex) {

// Exception handling

response = "error";

Log.e("Send file Exception", ex.getMessage() + "");

ex.printStackTrace();

}

return response;

}