我正在将文件上传到服务器,根据对文件的处理,我从服务器得到不同的回复。一切正常,但是从服务器获得回复非常慢。我检查了调试器,下面的代码行需要 6 秒才能运行。
inStream = new DataInputStream( connection.getInputStream() );
我已经在网络浏览器上测试了相同的文件和代码,结果非常完美,大约需要 1 或 2 秒才能显示回复。这是我的完整代码,我认为还可以,但也许这里有些事情没有正确完成。有没有更好的方法来做到这一点?还是一个新的 DataInputStream 总是那么慢?
private String loadImageFromNetwork(String myfile) {
HttpURLConnection connection = null;
DataOutputStream outStream = null;
DataInputStream inStream = null;
String make = "";
String model = "";
String disp = "";
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1*1024*1024;
String urlString = "http://xxxxxxxxxxxxxx/upload.php";
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://" + myfile)));
try {
FileInputStream fileInputStream = new FileInputStream(new File(myfile));
// open a URL connection to the Servlet
URL url = new URL(urlString);
// Open a HTTP connection to the URL
connection = (HttpURLConnection) url.openConnection();
// Allow Inputs
connection.setDoInput(true);
// Allow Outputs
connection.setDoOutput(true);
// Don't use a cached copy.
connection.setUseCaches(false);
// Use a post method.
connection.setRequestMethod("POST");
connection.setRequestProperty("Connection", "Keep-Alive");
connection.setRequestProperty("Content-Type", "multipart/form-data;boundary="+boundary);
outStream = new DataOutputStream(connection.getOutputStream());
outStream.writeBytes(twoHyphens + boundary + lineEnd);
outStream.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\"" + myfile +"\"" + lineEnd);
outStream.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) {
outStream.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...
outStream.writeBytes(lineEnd);
outStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
// close streams
fileInputStream.close();
outStream.flush();
outStream.close();
}
catch (MalformedURLException ex) {
ex.printStackTrace();
}
catch (IOException ioe) {
ioe.printStackTrace();
}
//------------------ read the SERVER RESPONSE
try {
inStream = new DataInputStream( connection.getInputStream() );
String str;
while (( str = inStream.readLine()) != null)
{
disp = disp + str;
}
inStream.close();
}
catch (IOException ioex){
ioex.printStackTrace();
}
return disp;
}