(Java) QR Code Generator via api.qrserver.com REST API

See more HTTP Examples

Demonstrates how to generate a QR code using the api.qrserver.com REST API service.

For more information, see https://goqr.me/api/doc/create-qr-code/

Chilkat Java Downloads Java Libs for Windows, MacOS, Linux, Alpine Linux, Solaris Java Libs for Android

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkHttp http = new CkHttp();
    boolean success;

    // Send the following GET request to get a binary response.
    // The body of the binary response contains the image data for the QR code.
    // https://api.qrserver.com/v1/create-qr-code/?data=[URL-encoded-text]&size=[pixels]x[pixels]

    CkJsonObject queryParams = new CkJsonObject();
    queryParams.UpdateString("data","Hello World");
    queryParams.UpdateString("size","100x100");

    // Get a PNG file..
    // Possible formats are:
    // png
    // gif
    // jpeg
    // jpg
    // svg
    // eps
    // Case matters.  Use lowercase.
    queryParams.UpdateString("format","png");

    // Send the GET request to an endpoint.
    // Chilkat will add the url-encoded query params passed in the JSON.
    CkHttpResponse resp = http.QuickRequestParams("GET","https://api.qrserver.com/v1/create-qr-code/",queryParams);
    if (http.get_LastMethodSuccess() == false) {
        System.out.println(http.lastErrorText());
        return;
        }

    // Did it succeed?
    if (resp.get_StatusCode() != 200) {
        // The response body, if anything, would not be the image data, but would likely be the error text (or HTML, or whatever...)
        System.out.println(resp.bodyStr());
        System.out.println("Response status = " + resp.get_StatusCode());
        System.out.println("Failed.");

        return;
        }

    // Success if we get here..
    // Save the binary body as the PNG file, or you can get the bytes of the PNG..
    success = resp.SaveBodyBinary("c:/temp/qa_output/qr_code.png");

    // Or get the bytes:
    CkBinData bd = new CkBinData();
    resp.GetBodyBd(bd);
    // Use the bytes in bd...
    // See the online reference documentation for the function to access the bytes directly.

    System.out.println("Success.");
  }
}