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POHTTP POST request with JSON String in JAVA
 

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  1. POHTTP POST request with JSON String in JAVA
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    <p>I have to make a http Post request using a JSON string I already have generated. I tried different two different methods : </p> <pre><code>1.HttpURLConnection 2.HttpClient </code></pre> <p>but I get the same "unwanted" result from both of them. My code so far with <strong>HttpURLConnection</strong> is:</p> <pre><code>public static void SaveWorkflow() throws IOException { URL url = null; url = new URL(myURLgoeshere); HttpURLConnection urlConn = null; urlConn = (HttpURLConnection) url.openConnection(); urlConn.setDoInput (true); urlConn.setDoOutput (true); urlConn.setRequestMethod("POST"); urlConn.setRequestProperty("Content-Type", "application/json"); urlConn.connect(); DataOutputStream output = null; DataInputStream input = null; output = new DataOutputStream(urlConn.getOutputStream()); /*Construct the POST data.*/ String content = generatedJSONString; /* Send the request data.*/ output.writeBytes(content); output.flush(); output.close(); /* Get response data.*/ String response = null; input = new DataInputStream (urlConn.getInputStream()); while (null != ((response = input.readLine()))) { System.out.println(response); input.close (); } } </code></pre> <p>My code so far with <strong>HttpClient</strong> is:</p> <pre><code>public static void SaveWorkflow() { try { HttpClient httpClient = new DefaultHttpClient(); HttpPost postRequest = new HttpPost(myUrlgoeshere); StringEntity input = new StringEntity(generatedJSONString); input.setContentType("application/json;charset=UTF-8"); postRequest.setEntity(input); input.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE,"application/json;charset=UTF-8")); postRequest.setHeader("Accept", "application/json"); postRequest.setEntity(input); HttpResponse response = httpClient.execute(postRequest); BufferedReader br = new BufferedReader( new InputStreamReader((response.getEntity().getContent()))); String output; while ((output = br.readLine()) != null) { System.out.println(output); } httpClient.getConnectionManager().shutdown(); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } </code></pre> <p>Where generated JsonString is like this:</p> <pre><code>{"description":"prova_Process","modelgroup":"","modified":"false"} </code></pre> <p>The response I get is:</p> <pre><code>{"response":false,"message":"Error in saving the model. A JSONObject text must begin with '{' at 1 [character 2 line 1]","ids":[]} </code></pre> <p>Any idea please?</p>
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    1. USDanielBarbarian
    1. USBlerta Dhimitri
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    1. COHave you tried just converting the String to an Object (parsing the JSON) without the HTTP transmission step in the middle?
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    2. COTry using generatedJSONString.trim()
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      1. USaquaraga
    3. COlooks like you want to use a RESTful webservice; you might want to make your life very easy by applying the JAX-RS API.
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      1. USGimby
 

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