How to Use Parameters with Httppost

How to use parameters with HttpPost

To set parameters to your HttpPostRequest you can use BasicNameValuePair, something like this :

    HttpClient httpclient;
    HttpPost httpPost;
    ArrayList<NameValuePair> postParameters;
    httpclient = new DefaultHttpClient();
    httpPost = new HttpPost("your login link");

    postParameters = new ArrayList<NameValuePair>();
    postParameters.add(new BasicNameValuePair("param1", "param1_value"));
    postParameters.add(new BasicNameValuePair("param2", "param2_value"));

    httpPost.setEntity(new UrlEncodedFormEntity(postParameters, "UTF-8"));

    HttpResponse response = httpclient.execute(httpPost);

Adding parameter to HttpPost on Apache's httpclient

HttpPost httpPost = new HttpPost(url);
List<NameValuePair> nvps = new ArrayList<NameValuePair>();
nvps.add(new BasicNameValuePair("param", "value"));
httpPost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));
httpClient.execute(httpPost);

How are parameters sent in an HTTP POST request?

The values are sent in the request body, in the format that the content type specifies.

Usually the content type is application/x-www-form-urlencoded, so the request body uses the same format as the query string:

parameter=value&also=another

When you use a file upload in the form, you use the multipart/form-data encoding instead, which has a different format. It's more complicated, but you usually don't need to care what it looks like, so I won't show an example, but it can be good to know that it exists.

Can't pass request parameters using http post

URL dos not work with spaces.From your code above: " &exportDiscardRec="
To avoid such issues use URIBuilder or something similar if possible.

Now for the request, you are not building your request correctly for example you do not provide the body.
Check below example:

    Map<String, String> colMapObj = new HashMap<>();
    colMapObj.put("testKey", "testdata");

    CloseableHttpClient client = HttpClients.createDefault();
    HttpPost httpPost = new HttpPost(url);

    JSONObject body = new JSONObject(colMapObj);
    StringEntity entity = new StringEntity(body.toString());
    httpPost.setEntity(entity);
    httpPost.setHeader("Accept", "application/json");
    httpPost.setHeader("Content-type", "application/json");

    CloseableHttpResponse response = client.execute(httpPost);
    System.out.println(response.getEntity().toString());
    client.close();

More examples just google "apache http client post examples" (e.g. http://www.baeldung.com/httpclient-post-http-request)

Query parameters with Apache http post

Change your content-type to application/x-www-form-urlencoded, and remove the leading ? from the body.

Setting parameters in HTTP POST

If you are posting data in json format then you should not post params like this. Instead create a JSONObject put these values in that json object, and get a string from that json object and then create a StringEntity, and set this Entity to HttpPost object.

Creating JSONObject for the Request:

JSONObject json=new JSONObject();
json.put("method", "completeUserLogin");
JSONArray arr= new JSONArray();
arr.put("100408");
json.put("params", arr);

String params=json.toString();

HTTP POST with URL query parameters -- good idea or not?

If your action is not idempotent, then you MUST use POST. If you don't, you're just asking for trouble down the line. GET, PUT and DELETE methods are required to be idempotent. Imagine what would happen in your application if the client was pre-fetching every possible GET request for your service – if this would cause side effects visible to the client, then something's wrong.

I agree that sending a POST with a query string but without a body seems odd, but I think it can be appropriate in some situations.

Think of the query part of a URL as a command to the resource to limit the scope of the current request. Typically, query strings are used to sort or filter a GET request (like ?page=1&sort=title) but I suppose it makes sense on a POST to also limit the scope (perhaps like ?action=delete&id=5).

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