(Android™) Creating an application/json HTTP POST Request

Demonstrates how to create an HTTP POST request having the Content-Type application/json, where the body of the HTTP request is the following JSON:

{
   "username" : "my_username",
   "password" : "my_password",
   "validation-factors" : {
      "validationFactors" : [
         {
            "name" : "remote_address",
            "value" : "127.0.0.1"
         }
      ]
   }
}

The generated HTTP request looks like this:

POST /something HTTP/1.1
Content-Type: application/json
Accept: application/json
Host: domain
Content-Length: 216

{
  "username": "my_username",
  "password": "my_password",
  "validation-factors": {
    "validationFactors": [
      {
        "name": "remote_address",
        "value": "127.0.0.1"
      }
    ]
  }
}

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // This example demonstrates building an application/json request.

    CkHttpRequest req = new CkHttpRequest();

    // The ContentType, HttpVerb, and Path properties should
    // always be explicitly set.
    req.put_HttpVerb("POST");
    req.put_Path("/something");
    req.put_ContentType("application/json");

    // We may wish to add an "Accept" header to the request.
    // This tells the server we'll accept an application/json response.
    req.AddHeader("Accept","application/json");

    // We'll use Chilkat's JSON API to create the JSON body of the HTTP request.
    CkJsonObject json = new CkJsonObject();
    json.AppendString("username","my_username");
    json.AppendString("password","my_password");
    CkJsonObject vFactors = json.AppendObject("validation-factors");
    CkJsonArray vArray = vFactors.AppendArray("validationFactors");
    vArray.AddObjectAt(0);
    CkJsonObject factorObj = vArray.ObjectAt(0);
    factorObj.AppendString("name","remote_address");
    factorObj.AppendString("value","127.0.0.1");

    // Use the JSON for the HTTP request body
    // By default, the Emit method will output compact JSON.
    // This is best for generating the smallest size request.
    // To generate a more human-readable (pretty-printed) JSON request body,
    // set the EmitCompact property to FALSE
    json.put_EmitCompact(false);
    req.LoadBodyFromString(json.emit(),"utf-8");

    // View the request that would be sent if SynchronousRequest was called:
    String requestMime = req.generateRequestText();
    Log.i(TAG, requestMime);

    // A few important comments about the HTTP request that is generated:
    // 
    // 1) The Content-Length header is automatically generated based on the actual length of the MIME message
    //    that follows the intial (topmost) MIME header.
    // 2) The HOST header will automatically get filled in with the actual domain when SynchronousRequest
    //    is called

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}