Trying to use Java Http URL connection to do curl command

Question

Hi I have the following curl script

curl -i -X PUT -d "{\"loginList\":[{\"externalLoginKey\":\"1406560803453iGBoMm\",\"testStatus\":\"R\"}]}" -H "X-test-debug-override: true" -k  http://someapi/logins

I am trying to do a Http post using java. Following is my code. Am i doing something wrong? I am getting error but curl runs fine

import java.io.DataOutputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpTesting {

public static void main(String[] args) throws Exception {

    String apiURL = "http://someapi/logins";
    URL url = new URL(apiURL);
    HttpURLConnection con = (HttpURLConnection) url.openConnection();
    String str = "{\"loginList\":[{\"externalLoginKey\":\"1406565099034jZrHXe\",\"testStatus\":\"R\"}]}";
    con.disconnect();

    con.setDoOutput(true);
    con.setDoInput(true);
    con.setRequestMethod("POST");
    con.setRequestProperty("Content-Type", "application/json");
    con.setRequestProperty("X-test-debug-override", "true");
    con.connect();

    OutputStream outStream = con.getOutputStream();
    DataOutputStream out = new DataOutputStream(outStream);
    out.writeBytes(str);
    out.flush();
    out.close();

    int responseCode = con.getResponseCode();
    System.out.println(responseCode);

}

}

What error are you getting? If you are getting an exception, please include the full stack trace in your question. Also, you probably should not call con.disconnect() on an HttpURLConnection you are about to use. — VGR
– VGR, Commented Jul 28, 2014 at 17:30

VGR · Accepted Answer · 2014-07-28 18:05:49Z

3

From the curl man page:

-d, --data <data>

(HTTP) Sends the specified data in a POST request to the HTTP server, in the same way that a browser does when a user has filled in an HTML form and presses the submit button. This will cause curl to pass the data to the server using the content-type application/x-www-form-urlencoded. Compare to -F, --form.

(Emphasis mine.)

Even though you are sending JSON, your Content-Type needs to be "application/x-www-form-urlencoded". Which means you also need to encode your data using URLEncoder:

out.writeBytes(URLEncoder.encode(str, "UTF-8"));

By the way, your curl command uses the PUT method while your Java code uses the "POST" method.

edited Jul 28, 2014 at 18:05

answered Jul 28, 2014 at 17:59

VGR

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