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cURL and HttpURLConnection - Post JSON Data

How to post JSON data using HttpURLConnection? I am trying this:

HttpURLConnection httpcon = (HttpURLConnection) ((new URL("a url").openConnection()));
httpcon.setDoOutput(true);
httpcon.setRequestProperty("Content-Type", "application/json");
httpcon.setRequestProperty("Accept", "application/json");
httpcon.setRequestMethod("POST");
httpcon.connect();

StringReader reader = new StringReader("{'value': 7.5}");
OutputStream os = httpcon.getOutputStream();

char[] buffer = new char[4096];
int bytes_read;    
while((bytes_read = reader.read(buffer)) != -1) {
    os.write(buffer, 0, bytes_read);// I am getting compilation error here
}
os.close();

I am getting compilation error in line 14.

The cURL request is:

curl -H "Accept: application/json" \
-H "Content-Type: application/json" \
-d "{'value': 7.5}" \
"a URL"

Is this the way to handle cURL request? Any information will be very helpful to me.

Thanks.

like image 737
Tapas Bose Avatar asked Mar 08 '12 18:03

Tapas Bose


2 Answers

OutputStream expects to work with bytes, and you're passing it characters. Try this:

HttpURLConnection httpcon = (HttpURLConnection) ((new URL("a url").openConnection()));
httpcon.setDoOutput(true);
httpcon.setRequestProperty("Content-Type", "application/json");
httpcon.setRequestProperty("Accept", "application/json");
httpcon.setRequestMethod("POST");
httpcon.connect();

byte[] outputBytes = "{'value': 7.5}".getBytes("UTF-8");
OutputStream os = httpcon.getOutputStream();
os.write(outputBytes);

os.close();
like image 98
ykaganovich Avatar answered Oct 07 '22 02:10

ykaganovich


You may want to use the OutputStreamWriter class.

final String toWriteOut = "{'value': 7.5}";
final OutputStreamWriter osw = new OutputStreamWriter(connection.getOutputStream());
osw.write(toWriteOut);
osw.close();
like image 9
Anthony Chuinard Avatar answered Oct 07 '22 00:10

Anthony Chuinard